JP6320085B2 - Waste water treatment device and operation method of waste water treatment device - Google Patents

Description

  The present invention provides a receiving unit for receiving the waste grinding treatment waste liquid, a solid-liquid separation tank for transferring and separating the waste grinding treatment waste liquid from the receiving unit, and separating the waste grinding treatment waste liquid, and the solid liquid A wastewater treatment apparatus provided with an anaerobic fermentation tank that accepts the precipitate separated and separated in the separation tank into biogas, an aerobic treatment tank that aerobically treats the treatment liquid, and a method of operating the wastewater treatment apparatus About.

In recent years, garbage disposers tend to become popular in households and collective housing for the purpose of reducing the volume of garbage, etc., and there is a tendency to install wastewater treatment equipment that can treat garbage that has been crushed by the disposer It is in.
Such a wastewater treatment apparatus accepts garbage pulverized waste liquid obtained by diluting crushed garbage with water, separates it into a solid-liquid separation tank, and separates the solid-liquid separated liquid phase into an aerobic treatment tank. At the same time, it is aerobically treated and purified, and the precipitate is biogasified in an anaerobic fermenter.

  In such a wastewater treatment apparatus, conventionally, the receiving part and the solid-liquid separation tank and the like are provided adjacent to each other with a partition wall, and the liquid level of the receiving part is formed at the upper end of the partition wall. Thus, the waste crushing waste liquid from the receiving part overflows the upper end of the partition wall and is transferred to the solid-liquid separation tank. In addition, the solid-liquid separation tank and the aerobic treatment tank are provided adjacent to each other in a state of being partitioned by a partition wall, and the liquid surface of the solid-liquid separation tank is formed at the upper end of the partition wall so that the solid-liquid separation is performed. The liquid phase from the tank overflowed the upper end of the partition wall and was transferred to the aerobic treatment tank (see, for example, Patent Document 1).

  In addition, an operation method has been adopted in which the entire amount of waste pulverization waste liquid that needs to be processed in a predetermined period is supplied continuously to the receiving unit at a relatively high supply speed. For example, when the predetermined period is one day and the total amount of waste crushing waste liquid is 350 L (liter), the total amount of waste crushing waste liquid is 9.1 at a relatively high supply rate of, for example, 38.5 L / min. It was supplied continuously to the receiving department in one minute.

JP 2013-27851 A

  In the conventional waste water treatment apparatus, the waste crushing waste liquid is stored in a full state in each of the receiving unit and the solid-liquid separation tank by processing in a predetermined period immediately before each predetermined period at the start of each predetermined period. Therefore, the waste pulverization waste liquid is transferred from the receiving part to the solid-liquid separation tank at the same advancing speed as the supply speed for supplying the waste pulverization waste liquid to the receiving part, and the aerobic treatment is performed from the solid-liquid separation tank. The liquid phase will flow to the tank.

Therefore, in the treatment in each predetermined period, the amount of garbage pulverization treatment waste liquid equivalent to the total amount of waste pulverization treatment waste liquid that needs to be processed in each predetermined period is the same as the supply speed of the garbage pulverization treatment waste liquid to the receiving unit. At a relatively large advancing speed, the advancing portion continuously moves from the receiving portion to the solid-liquid separation tank. As a result, in the solid-liquid separation tank, the waste pulverization waste liquid stored inside is disturbed and solid-liquid separation is not performed well, and the upper liquid phase contains a large amount of solids. It becomes a state.
Then, the liquid phase containing a large amount of solids is transferred from the solid-liquid separation tank to the aerobic treatment tank at a comparatively large advection speed, and the solids transferred to the aerobic treatment tank together with the liquid phase. Since the amount increases, the load of aerobic treatment in the aerobic treatment tank increases. Therefore, the aerobic treatment tank cannot sufficiently perform the aerobic treatment, and there is room for improvement in improving the cleanliness of the drainage discharged from the aerobic treatment tank.

  This invention is made | formed in view of this situation, The objective is to provide the drainage processing apparatus which can improve the cleanliness of the waste_water | drain which purify | cleans and discharges, and the operating method of the waste-water treatment apparatus. .

Wastewater treatment device according to the present invention for achieving the above Symbol object is provided with a receiving portion for receiving the garbage pulverized waste,
A solid-liquid separation tank for transferring the garbage pulverization waste liquid from the receiving part to precipitate and separate the garbage pulverization waste liquid;
An anaerobic fermentation tank that accepts the precipitate separated in the solid-liquid separation tank and converts it to biogas;
A sludge settling tank for receiving the liquid phase of the solid-liquid separation tank;
A wastewater treatment apparatus provided with an aerobic treatment tank that accepts the liquid phase of the sludge settling tank and performs an aerobic treatment,
The sludge settling tank is a structure in which precipitates are precipitated separated by the aerobic treatment tank Ru is returned,
A liquid phase advection part for advancing the liquid phase from the solid-liquid separation tank to the anaerobic fermentation tank, and a precipitate advection part for advancing the precipitate of the solid-liquid separation tank to the anaerobic fermentation tank ,
While providing advection means for advancing the liquid phase from the solid-liquid separation tank to the sludge settling tank ,
Providing a return path for returning the sediment separated in the sludge settling tank to the anaerobic fermentation tank;
With respect to the total amount of waste grind processing waste liquid received by the receiving unit in a predetermined period, the amount of waste grind processing waste liquid from the receiving unit to the solid-liquid separation tank is divided into a plurality of adjustment amounts obtained by dividing the total amount of waste grind processing waste liquid. And a convection step for advancing the garbage pulverization treatment waste liquid to the solid-liquid separation tank by the amount of the garbage pulverization treatment waste liquid, and stopping the advection following the advection process to precipitate in the solid-liquid separation tank And a stationary process for promoting sedimentation of the object, and a processing amount control means for processing the whole waste crushing processing waste liquid for the predetermined period is provided.
Another wastewater treatment apparatus according to the present invention for achieving the above object is provided with a receiving portion for receiving waste pulverization waste liquid,
A solid-liquid separation tank for transferring the garbage pulverization waste liquid from the receiving part to precipitate and separate the garbage pulverization waste liquid;
An anaerobic fermentation tank that accepts the precipitate separated in the solid-liquid separation tank and converts it to biogas;
A wastewater treatment apparatus provided with an aerobic treatment tank that receives the liquid phase of the solid-liquid separation tank and performs an aerobic treatment,
A sludge settling tank is provided to return the sediment separated by precipitation in the aerobic treatment tank,
A liquid phase advection part for advancing the liquid phase from the solid-liquid separation tank to the anaerobic fermentation tank, and a precipitate advection part for advancing the precipitate of the solid-liquid separation tank to the anaerobic fermentation tank,
While providing advection means for advancing the liquid phase from the solid-liquid separation tank to the aerobic treatment tank,
Providing a return path for returning the sediment separated in the sludge settling tank to the anaerobic fermentation tank;
With respect to the total amount of waste grind processing waste liquid received by the receiving unit in a predetermined period, the amount of waste grind processing waste liquid from the receiving unit to the solid-liquid separation tank is divided into a plurality of adjustment amounts obtained by dividing the total amount of waste grind processing waste liquid. And a convection step for advancing the garbage pulverization treatment waste liquid to the solid-liquid separation tank by the amount of the garbage pulverization treatment waste liquid, and stopping the advection following the advection process to precipitate in the solid-liquid separation tank And a stationary process for promoting sedimentation of the object, and a processing amount control means for processing the whole waste crushing processing waste liquid for the predetermined period is provided.

According to the above SL characteristic configuration, by the processing amount control means, it is performed advection process and consisting of a standing step process is repeated, during each predetermined period, garbage pulverizing waste solution to be processed in each predetermined period The whole amount is processed.
In each advection step, the garbage pulverization treatment waste liquid is transferred from the receiving unit to the solid-liquid separation tank by the amount of the garbage pulverization treatment waste liquid adjusted to a plurality of adjustment amounts obtained by dividing the total amount of the garbage pulverization treatment waste liquid.
In this advection process, the advection speed for advancing the garbage grinding waste liquid from the receiving part to the solid-liquid separation tank can be made sufficiently small. Disturbances in the waste crushing waste liquid stored in the tank are sufficiently suppressed.
Moreover, in each stationary process, since the transfer of the garbage grinding waste liquid from a receiving part to a solid-liquid separation tank is stopped, sedimentation of the sediment in a solid-liquid separation tank is accelerated | stimulated.
In other words, the disruption of the garbage grinding waste liquid due to the transfer of the garbage grinding waste liquid to the solid-liquid separation tank is sufficiently suppressed, and the precipitation in the solid liquid separator tank is stopped by stopping the transfer of the garbage grinding waste liquid. Since sedimentation of the product is promoted, solid-liquid separation is favorably performed in the solid-liquid separation tank, and the solid content can be sufficiently suppressed from being contained in the liquid phase of the solid-liquid separation tank.
And since the liquid phase of the solid-liquid separation tank in which the solid content is sufficiently suppressed is transferred from the solid-liquid separation tank to the sludge settling tank or the aerobic treatment tank by the advancing means, the sludge settling from the solid-liquid separation tank. The amount of solid content transferred together with the liquid phase to the tank or the aerobic treatment tank can be sufficiently reduced, and the processing load in the sludge settling tank or the aerobic treatment tank is reduced.
Therefore, it is possible to provide a wastewater treatment apparatus that can improve the cleanliness of the wastewater that is purified and discharged.

Also, it provided with a first advection unit for advection the liquid phase to the sludge settling tank from the solid-liquid separation tank as the advection means, second advection advected the liquid phase to the aerobic treatment tank from the sludge settling tank Set up a section,
The provided with a first return passage for returning the precipitate from the aerobic treatment tank to said sludge settling tank, the return path for returning the precipitate separated precipitate in the sludge settling tank to the anaerobic fermentation tank, the second Provided as a return path,
At least the carrier gas in the second return path may be an anaerobic gas.

According to the above SL construction, the first advection part, together with the liquid phase of the solid-liquid separation tank containing solids is sufficiently suppressed is advected sludge settling tank, the second advection portion, the sludge settling tank Since the liquid phase is transferred to the aerobic treatment tank, the amount of solids transferred to the aerobic treatment tank can be sufficiently reduced, and the first return path allows precipitation in the aerobic treatment tank. The separated sediment is returned to the sludge settling tank, and the precipitate separated in the sludge settling tank is returned to the anaerobic fermentation tank by the second return path. The processing load in the tank is further reduced.
Since at least the carrier gas in the second return path is an anaerobic gas, it is possible to prevent the anaerobic fermenter from being aerobically biased to reduce the biogasification of the precipitate.
Accordingly, it is possible to further improve the cleanliness of the wastewater discharged by the purification treatment.

Also, providing the third advection unit for advection the liquid phase to the aerobic treatment tank from said solid-liquid separation tank as the advection means,
The provided with a first return passage for returning the precipitate from the aerobic treatment tank to said sludge settling tank, the return path for returning the precipitate separated precipitate in the sludge settling tank to the anaerobic fermentation tank, the second Provided as a return path,
At least the carrier gas in the second return path may be an anaerobic gas.

According to the above SL construction, the third advection portion, since the liquid phase of the solid-liquid separation tank containing solids is sufficiently suppressed is advected aerobic treatment tank, is advected aerobic treatment tank The amount of solid content can be reduced sufficiently, and the sediment separated in the aerobic treatment tank is returned to the sludge settling tank by the first return path, and the sludge is removed by the second return path. Since the precipitate separated by precipitation in the settling tank is returned to the anaerobic fermentation tank, the processing load in the aerobic treatment tank is further reduced by these synergistic effects.
Since at least the carrier gas in the second return path is an anaerobic gas, it is possible to prevent the anaerobic fermenter from being aerobically biased to reduce the biogasification of the precipitate.
Accordingly, it is possible to further improve the cleanliness of the wastewater discharged by the purification treatment.

Also, provided with a advection path for advection said garbage pulverizing process waste liquid received in the receiving portion in the solid-liquid separation tank, equipped with intermittent drivable raw water pump to the advection path,
In the processing amount control means, the raw water pump is operated in the advection step to transfer the garbage pulverization waste liquid from the receiving unit to the solid-liquid separation tank by the adjusted amount, and in the stationary step, the raw water The pump may be stopped for a stationary time.

According to the above SL construction, the advection step, the raw water pump is actuated by the processing amount control means, the adjustment amount only garbage pulverizing processing effluent from the receiving unit in the solid-liquid separation tank is advection, the higher static置工, processing The raw water pump is stopped during the standing time by the amount control means.
In other words, by using the raw water pump as a means for transferring the waste pulverization waste liquid from the receiving part to the solid-liquid separation tank, the advection process and the stationary process can be appropriately executed, and the cleanliness of the waste water Can be improved accurately.

Also, by the operation of the raw water pump, the solids content of the garbage pulverizing waste solution to be advected in the solid-liquid separation tank from the receiving unit may be further pulverized.

According to the above SL construction, the raw water pump, when the garbage pulverizing waste is advected to solid-liquid separation tank from the receiving portion, since the solid content of the garbage pulverizing waste is further crushed by the raw water pump The anaerobic fermentation of the precipitate in the anaerobic fermenter is further promoted.
Therefore, the production amount of biogas can be increased and the volume reduction of garbage can be promoted.

In addition, the advection step and the stand step, the solid-liquid separation tank, the anaerobic fermentation tank, the sludge settling tank, the cleanliness of the waste water to be treated through the aerobic treatment tank, from the minimum acceptable cleanliness Also, the adjustment amount may be set so as to be an excellent value.

According to the above SL construction, in advection step and standing process, garbage pulverizing waste solid-liquid separation tank, anaerobic fermentation tank, the sludge settling tank, by being processed through the aerobic treatment tank, aerobic treatment The cleanliness of the waste water discharged from the tank becomes a value superior to the allowable minimum cleanliness.
Therefore, the waste pulverization waste liquid can be purified and discharged so that the cleanliness is a value superior to the allowable minimum cleanliness.

The operation method of the wastewater treatment apparatus according to the present invention for achieving the above object is provided with a receiving part for receiving the waste pulverization waste liquid,
A solid-liquid separation tank for transferring the garbage pulverization waste liquid from the receiving part to precipitate and separate the garbage pulverization waste liquid;
An anaerobic fermentation tank that accepts the precipitate separated in the solid-liquid separation tank and converts it to biogas;
A sludge settling tank for receiving the liquid phase of the solid-liquid separation tank;
An operation method of a wastewater treatment apparatus provided with an aerobic treatment tank that accepts the liquid phase of the sludge settling tank and performs an aerobic treatment,
The sludge settling tank is a structure in which precipitates are precipitated separated by the aerobic treatment tank Ru is returned,
A liquid phase advection part for advancing the liquid phase from the solid-liquid separation tank to the anaerobic fermentation tank, and a precipitate advection part for advancing the precipitate of the solid-liquid separation tank to the anaerobic fermentation tank ,
While providing advection means for advancing the liquid phase from the solid-liquid separation tank to the sludge settling tank ,
Providing a return path for returning the sediment separated in the sludge settling tank to the anaerobic fermentation tank;
With respect to the total amount of waste grind processing waste liquid received by the receiving unit in a predetermined period, the amount of waste grind processing waste liquid from the receiving unit to the solid-liquid separation tank is divided into a plurality of adjustment amounts obtained by dividing the total amount of waste grind processing waste liquid. And a convection step for advancing the garbage pulverization treatment waste liquid to the solid-liquid separation tank by the amount of the garbage pulverization treatment waste liquid, and stopping the advection following the advection process to precipitate in the solid-liquid separation tank And the stationary step of promoting sedimentation of the object is repeated to treat the whole waste pulverization waste liquid in the predetermined period.
In order to achieve the above object, another method for operating a wastewater treatment apparatus according to the present invention is provided with a receiving unit that receives waste pulverization waste liquid,
A solid-liquid separation tank for transferring the garbage pulverization waste liquid from the receiving part to precipitate and separate the garbage pulverization waste liquid;
An anaerobic fermentation tank that accepts the precipitate separated in the solid-liquid separation tank and converts it to biogas;
An operation method of a wastewater treatment apparatus provided with an aerobic treatment tank that receives the liquid phase of the solid-liquid separation tank and performs an aerobic treatment,
A sludge settling tank is provided to return the sediment separated by precipitation in the aerobic treatment tank,
A liquid phase advection part for advancing the liquid phase from the solid-liquid separation tank to the anaerobic fermentation tank, and a precipitate advection part for advancing the precipitate of the solid-liquid separation tank to the anaerobic fermentation tank,
While providing advection means for advancing the liquid phase from the solid-liquid separation tank to the aerobic treatment tank,
Providing a return path for returning the sediment separated in the sludge settling tank to the anaerobic fermentation tank;
With respect to the total amount of waste grind processing waste liquid received by the receiving unit in a predetermined period, the amount of waste grind processing waste liquid from the receiving unit to the solid-liquid separation tank is divided into a plurality of adjustment amounts obtained by dividing the total amount of waste grind processing waste liquid. And a convection step for advancing the garbage pulverization treatment waste liquid to the solid-liquid separation tank by the amount of the garbage pulverization treatment waste liquid, and stopping the advection following the advection process to precipitate in the solid-liquid separation tank And the stationary step of promoting sedimentation of the object is repeated to treat the whole waste pulverization waste liquid in the predetermined period.

According to the above SL construction, and repeatedly executes the processing steps consisting of advection step and standing process, during a predetermined time period, treating the food waste grinding processing effluent total amount to be processed in the predetermined period.
In each advection process, the garbage pulverization treatment waste liquid is transferred from the receiving unit to the solid-liquid separation tank by the amount of the garbage pulverization treatment waste liquid adjusted to a plurality of adjustment amounts obtained by dividing the total amount of the garbage pulverization treatment waste liquid.
In this advection process, the advection speed for advancing the garbage grinding waste liquid from the receiving part to the solid-liquid separation tank can be made sufficiently small. Disturbances in the waste crushing waste liquid stored in the tank are sufficiently suppressed.
Moreover, in each stationary process, since transfer of the garbage grinding process waste liquid from a receiving part to a solid-liquid separation tank is stopped, sedimentation of the sediment in a solid-liquid separation tank is accelerated | stimulated.
In other words, the disruption of the garbage grinding waste liquid due to the transfer of the garbage grinding waste liquid to the solid-liquid separation tank is sufficiently suppressed, and the precipitation in the solid liquid separator tank is stopped by stopping the transfer of the garbage grinding waste liquid. Since sedimentation of the product is promoted, solid-liquid separation is favorably performed in the solid-liquid separation tank, and the solid content can be sufficiently suppressed from being contained in the liquid phase of the solid-liquid separation tank.
And since the liquid phase of the solid-liquid separation tank in which the solid content is sufficiently suppressed is transferred from the solid-liquid separation tank to the sludge settling tank or the aerobic treatment tank by the advancing means, the sludge settling from the solid-liquid separation tank. The amount of solid content transferred together with the liquid phase to the tank or the aerobic treatment tank can be sufficiently reduced, and the processing load in the sludge settling tank or the aerobic treatment tank is reduced.
Accordingly, it is possible to provide a method for operating the wastewater treatment apparatus that can improve the cleanliness of the wastewater that is purified and discharged.

Also, it provided with a first advection unit for advection the liquid phase to the sludge settling tank from the solid-liquid separation tank as the advection means, second advection advected the liquid phase to the aerobic treatment tank from the sludge settling tank Set up a section,
The provided with a first return passage for returning the precipitate from the aerobic treatment tank to said sludge settling tank, the return path for returning the precipitate separated precipitate in the sludge settling tank to the anaerobic fermentation tank, the second Provided as a return path,
At least the carrier gas in the second return path may be an anaerobic gas.
According to the above characteristic configuration, the liquid phase of the solid-liquid separation tank in which the solid content is sufficiently suppressed is transferred to the sludge settling tank by the first transfer section, and the sludge settling tank of the sludge settling tank is transferred by the second transfer section. Since the liquid phase is transferred to the aerobic treatment tank, the amount of solids transferred to the aerobic treatment tank can be sufficiently reduced, and the first return path separates the precipitate in the aerobic treatment tank. Since the sediment deposited in the sludge sedimentation tank is returned to the anaerobic fermentation tank by the second return path, the synergistic effect of these precipitates returns to the aerobic treatment tank. Thus, the processing load in the process is further reduced.
Since at least the carrier gas in the second return path is an anaerobic gas, it is possible to prevent the anaerobic fermenter from being aerobically biased to reduce the biogasification of the precipitate.
Accordingly, it is possible to further improve the cleanliness of the wastewater discharged by the purification treatment.

Further, a third advection part for advancing the liquid phase from the solid-liquid separation tank to the aerobic treatment tank is provided as the advection means,
A first return path for returning the sediment from the aerobic treatment tank to the sludge settling tank is provided, and a second return path for returning the precipitate separated and separated in the sludge settling tank to the anaerobic fermentation tank, Provided as a return path,
At least the carrier gas in the second return path may be an anaerobic gas.
According to the above characteristic configuration, since the liquid phase of the solid-liquid separation tank in which the solid content is sufficiently suppressed is transferred to the aerobic treatment tank by the third advection section, the liquid is transferred to the aerobic treatment tank. The amount of solids can be sufficiently reduced, and the sediment separated in the aerobic treatment tank is returned to the sludge settling tank by the first return path, and the sludge settled by the second return path. Since the precipitate separated by precipitation in the tank is returned to the anaerobic fermentation tank, the processing load in the aerobic treatment tank is further reduced by these synergistic effects.
Since at least the carrier gas in the second return path is an anaerobic gas, it is possible to prevent the anaerobic fermenter from being aerobically biased to reduce the biogasification of the precipitate.
Accordingly, it is possible to further improve the cleanliness of the wastewater discharged by the purification treatment.

Also, provided with a advection path for advection said garbage pulverizing process waste liquid received in the receiving portion in the solid-liquid separation tank, equipped with intermittent drivable raw water pump to the advection path,
In the advection step, the raw water pump is operated to move the garbage pulverization waste liquid from the receiving portion to the solid-liquid separation tank by the adjusted amount, and in the static step, the raw water pump is stopped for a static time. May be.

According to the above SL construction, the advection step, by operating the raw water pump, the adjustment amount only solid-liquid in the separation tank garbage pulverizing processing effluent from the receiving unit and advection, the higher static置工, the raw water pump standing time Stop for a while.
In other words, by using the raw water pump as a means for transferring the waste pulverization waste liquid from the receiving part to the solid-liquid separation tank, the advection process and the stationary process can be appropriately executed, and the cleanliness of the waste water Can be improved accurately.

In addition, the advection step and the stand step, the solid-liquid separation tank, the anaerobic fermentation tank, the sludge settling tank, the cleanliness of the waste water to be treated through the aerobic treatment tank, from the minimum acceptable cleanliness Also, the adjustment amount may be set so as to be an excellent value.

According to the above SL construction, in advection step and standing process, garbage pulverizing waste solid-liquid separation tank, anaerobic fermentation tank, the sludge settling tank, by being processed through the aerobic treatment tank, aerobic treatment The cleanliness of the waste water discharged from the tank becomes a value superior to the allowable minimum cleanliness.
Therefore, the waste pulverization waste liquid can be purified and discharged so that the cleanliness is a value superior to the allowable minimum cleanliness.

Longitudinal front view of the waste water treatment apparatus according to the first embodiment The block diagram which shows typically the waste water treatment equipment which concerns on 1st Embodiment Longitudinal front view of the waste water treatment apparatus according to the second embodiment The block diagram which shows typically the waste water treatment equipment which concerns on 2nd Embodiment

  Hereinafter, the waste water treatment apparatus of the present invention will be described with reference to the drawings. Preferred embodiments are described below, but these embodiments are described in order to more specifically illustrate the present invention, and various modifications can be made without departing from the spirit of the present invention. However, the present invention is not limited to the following description.

[First Embodiment]
First, the first embodiment will be described.
[Wastewater treatment equipment]
As shown in FIGS. 1 and 2, the waste water treatment apparatus of the present invention includes a receiving port 11 that receives a waste grinding waste liquid and a storage tank that stores the waste grinding waste liquid received at the receiving port 11. 1 (an example of a receiving part), the waste pulverized waste liquid from the storage tank 1 is transferred to the solid-liquid separation tank 2 for separating and separating the raw garbage pulverized waste liquid, and the precipitate separated in the solid-liquid separation tank 2 Anaerobic fermenter 3 for accepting the product and converting it to biogas, an aerobic treatment tank 4 for aerobic treatment of the treatment liquid, a sludge settling tank 5 for returning the precipitate separated in the aerobic treatment tank 4, and waste water A control unit 6 for controlling the operation of the processing apparatus is provided.

In addition, a transfer channel 12 for transferring the waste pulverization waste liquid received in the storage tank 1 to the solid-liquid separation tank 2 is provided, and a raw water pump P3 that can be intermittently driven is provided in the transfer channel 12.
Furthermore, a liquid phase advection part 21 for advancing the supernatant liquid (ie, liquid phase) from the solid-liquid separation tank 2 to the anaerobic fermentation tank 3, a sediment advection part 22 for advancing the sediment, and a sludge settling tank from the solid-liquid separation tank 2 5 or aerobic treatment tank 4 is provided with advection means M for advancing the liquid phase, and a return path R for returning the sediment precipitated and separated in sludge sedimentation tank 5 to anaerobic fermentation tank 3.

In the first embodiment, a tubular first advection portion 25 for advancing the liquid phase from the solid-liquid separation tank 2 to the sludge settling tank 5 is provided as the transfer means M, and the sludge settling tank 5 is changed to the aerobic treatment tank 4. A second advection portion 52 for advancing the liquid phase is provided.
Further, a first return path 41 for returning the sediment from the aerobic treatment tank 4 to the sludge settling tank 5 and a second return path 51 for returning the precipitate from the sludge settling tank 5 to the anaerobic fermentation tank 3 are provided. . Then, the return path R constituted by a second return path 51, the return passage R, is arranged to return the sludge settling tank 5 by sedimentation separated precipitate anaerobic fermenter 3.

  Furthermore, the biogas outlet 31 for taking out the biogas generated in the anaerobic fermentation tank 3, the biogas taken out from the biogas outlet 31 through the biogas outlet path 37 can be temporarily stored, and can be sent to the outside as needed. A biogas tank T and a drain outlet 42 for discharging treated wastewater that has been aerobically treated in the aerobic treatment tank 4 to the outside are provided.

  Then, the waste grinding waste liquid received from the receiving port 11 is precipitated and separated in the solid-liquid separation tank 2, the precipitate is converted into biogas by anaerobic fermentation in the anaerobic fermentation tank 3, and the biogas is discharged from the biogas outlet 31. The liquid phase is taken out by the biogas take-out passage 37, and the liquid phase is purified by the aerobic treatment in the sludge settling tank 5 and the aerobic treatment tank 4, and discharged to the outside from the drain outlet 42 as clean waste water.

  Specifically, as shown in FIG. 1, the inside of the waste water treatment apparatus main body A is aligned in the left-right direction of the waste water treatment apparatus main body A by four partition walls W12, W23, W35, W45 (the same as the left-right direction in FIG. 1). ) Are divided into five tanks, and the storage tank 1, the solid-liquid separation tank 2, the anaerobic fermentation tank 3, the sludge settling tank 5, and the aerobic treatment tank 4 are arranged in a line from one end in the left-right direction (the left end in FIG. 1). It is formed. Referring to the state of communication between the tanks, as can be seen from FIG. 1, the storage tank 1, the solid-liquid separation tank 2, and the anaerobic fermentation tank 3 communicate with each other only on the gas phase side, and the solid-liquid separation tank 2 and the anaerobic tank. The fermenter 3 communicates with the gas phase side and the liquid phase side. The anaerobic fermentation tank 3 and the sludge settling tank 5 are shut off on both the gas phase side and the liquid phase side, and the sludge settling tank 5 and the aerobic treatment tank 4 communicate with the gas phase side and the liquid phase side. Further, a biogas outlet 31 is formed in the gas phase portion at the upper part of the anaerobic fermentation tank 3, and the gas generated in the anaerobic fermentation tank 3 is taken out from the biogas outlet path 37. However, it does not flow out from this tank to the sludge settling tank 5 and the aerobic treatment tank 4.

[Reservoir]
As shown in FIG. 1, a receiving port 11 is provided in the vicinity of the liquid level of the storage tank 1 in the waste water treatment apparatus main body A, and a storage space 13 is formed in the storage tank 1 to store the waste crushing waste liquid. Yes. Further, in the storage space 13, a storage tank aeration device 14 that supplies biogas stored in the biogas tank T as anaerobic gas by an anaerobic gas pump P <b> 1 is provided and aerated and stirred from the lower part of the storage tank 1. The waste pulverization treatment waste liquid received is stored, while being solubilized and configured to function as a solubilization tank for fluidization. Moreover, in this storage tank 1, foreign materials with large specific gravity, such as a metal, are removed. Note that an air supply passage (not shown) for sending biogas from the biogas tank T to the storage tank diffuser 14 is provided with an on-off valve V1 and a flow rate adjusting valve V2, and the on-off valve V1 and the flow rate adjusting valve V2 The air diffuser from the storage tank diffuser 14 can be intermittently adjusted and the amount of air diffused can be adjusted.

The upper end of the partition wall W12 that divides the storage tank 1 and the solid-liquid separation tank 2 extends to near the ceiling of the waste water treatment apparatus main body A, and is positioned above the liquid surface of the storage tank 1, thereby The liquid phase part of the storage tank 1 and the liquid phase part of the solid-liquid separation tank 2 are shut off.
The transfer channel 12 is disposed with its proximal end submerged close to the bottom of the storage tank 1, and the tip is disposed in the gas phase portion of the solid-liquid separation tank 2, and the raw water pump P 3 is provided in the transfer channel 12. Is sucked into the storage tank 1.
As a result, the raw water pump P3 can transfer almost the entire amount of the waste crushing waste liquid stored in the storage tank 1 to the solid-liquid separation tank 2 through the transfer channel 12.
Further, when the raw water pump P3 moves the waste grinding waste liquid from the storage tank 1 to the solid-liquid separation tank 2, the raw water pump P3 further grinds the solid content of the raw waste grinding waste liquid.

[Solid-liquid separation tank]
As shown in FIG. 1, the solid-liquid separation tank 2 is formed with a precipitation separation space 23 that makes it possible to precipitate and separate solid components from the solubilized liquid transferred through the transfer flow path 12. As a result, a sediment deposition layer 22c is formed, and the upper region thereof becomes the supernatant layer of the solubilized liquid.
In the lower part of the solid-liquid separation tank 2, the precipitate from which the solid components are precipitated and separated in the solid-liquid separation tank 2 is transferred to the anaerobic fermentation tank 3 together with the solubilized liquid, and the anaerobic treatment is performed in the anaerobic fermentation tank 3. A sediment advection section 22 is provided that enables the returned wastewater (excess liquid phase) to be returned to the solid-liquid separation tank 2.
Furthermore, a liquid phase advection section 21 for advancing the supernatant of the solid-liquid separation tank 2 to the anaerobic fermentation tank 3 is provided.

[Advection of sediment to anaerobic fermenter]
As shown in FIG. 1, the sediment advection part 22 is configured to include a slit-like slit-like outlet 22 a as a constricted part provided at the lower part of the precipitation separation space 23 of the solid-liquid separation tank 2. Specifically, the downflow guide plate 24 is inclined so that the lower side is located on the anaerobic fermentation tank 3 side, and the solid-liquid separation tank 2 side in the partition wall W12 that partitions the storage tank 1 and the solid-liquid separation tank 2 It extends from the lower part of the surface. Moreover, the lower part of the partition wall W23 which divides the solid-liquid separation tank 2 and the anaerobic fermentation tank 3 is configured as an inclined wall part 22b that approaches the solid-liquid separation tank 2 side toward the lower side, and a lower end edge of the inclined wall part 22b A slit is formed between the flow-down guide plate 24 and the obliquely upward surface, and a slit-shaped outlet 22a is formed by the flow-down guide plate 24 and the inclined wall portion 22b below the partition wall W23. This suppresses advection of the precipitate, the solubilized liquid, and the treated wastewater through the slit-shaped outlet 22a, and deposits in the solid-liquid separation tank 2 are deposited by closing the slit-shaped outlet 22a. The layer 22c can be formed.

  In the above configuration, the width of the slit-shaped outlet 22a is about 10-30 mm, preferably about 15 mm.

[Advection to the anaerobic fermentation tank and sludge settling tank on the supernatant side]
As can be seen from FIG. 1, the partition wall W23 that separates the solid-liquid separation tank 2 and the anaerobic fermentation tank 3 includes the inclined wall portion 22b described above in the lower area thereof, and in the front-rear direction of the waste water treatment apparatus main body A. The waste water treatment apparatus body A is provided so as to extend over both side walls.
And the upper end edge 27 of the partition wall W23 is located below the ceiling of the waste water treatment apparatus main body A, and the upper end edge 27 of the partition wall W23 is used for the treatment liquid in the solid-liquid separation tank 2 and the anaerobic fermentation tank 3. The liquid level position is formed. Thus, the supernatant of the solid-liquid separation tank 2 overflows the upper end edge 27 of the partition wall W23 and is transferred to the anaerobic fermentation tank 3, and the upper end edge 27 of the partition wall W23 allows the overflow liquid to overflow. A liquid phase advection section 21 is configured.

The tubular first advection section 25 has a base end positioned slightly below the upper end edge 27 of the partition wall W23 in the solid-liquid separation tank 2, and a tip end of the gas phase above the sludge settling tank 5. It is located in the area.
A large amount of biogas is generated in the anaerobic fermenter 3 and the gas phase region of the anaerobic fermenter 3 and the gas phase region of the solid-liquid separation tank 2 communicate with each other. The pressure is higher than the gas phase region of the sludge settling tank 5.
Therefore, the supernatant liquid of the solid-liquid separation tank 2 is caused to flow into the first advection section 25 from its proximal end due to the pressure difference between the gas-phase area of the solid-liquid separation tank 2 and the gas-phase area of the sludge settling tank 5. Thus, it can be transferred to the sludge settling tank 5 through the first transfer part 25.

[Anaerobic fermenter]
As shown in FIG. 1, the anaerobic fermentation tank 3 forms an anaerobic fermentation space 32 in which the sediment received from the sediment advection unit 22 is biodegraded by anaerobic fermentation by methane bacteria in the waste water treatment apparatus main body A. It is configured. The anaerobic fermentation space 32 is provided with a heat exchanger 33 for maintaining the treated water in the anaerobic fermentation space 32 at a good temperature for good methane fermentation. An upper space of the anaerobic fermentation space 32 constitutes a biogas collection space 34 for collecting biogas generated in the anaerobic fermentation space 32. The biogas outlet 31 described above is provided facing this biogas collection space 34.

  The anaerobic fermentation space 32 is provided with an ejector aeration device 35 and a circulation aeration device 36 for supplying biogas stored in the biogas tank T as anaerobic gas by an anaerobic gas pump P1. An on-off valve V1 and a flow rate adjusting valve V2 are provided in an air supply passage (not shown) for sending biogas from the biogas tank T to the air diffuser 35 for ejector and the air diffuser 36 for circulation. The adjustment valve V2 is configured so that the air diffuser 35 can be intermittently adjusted and the amount of air diffused from the ejector air diffuser 35 and the circulation air diffuser 36 can be adjusted. The anaerobic gas is intermittently diffused by the ejector aeration device 35 and the circulation aeration device 36.

  As shown by the arrow in FIG. 1, the air diffuser 35 for the ejector is disposed so as to be able to form a gas-liquid mixed phase flow that rises from below the slit-shaped outlet 22a, and from the solid-liquid separation tank 2 via the slit-shaped outlet 22a. Thus, the precipitate is transferred to the anaerobic fermenter 3, and a precipitate advancing mechanism is formed that allows the excess liquid phase of the anaerobic fermenter 3 to be returned to the solid-liquid separation tank 2 via the slit-shaped outlet 22a. The circulation diffuser 36 is arranged on the lower side of the heat exchanger 33 so as to form a circulation flow in the entire anaerobic fermentation tank 3 between the heat exchanger 33 and the partition wall W35.

Hereinafter, the functions of the air diffuser 35 for ejector and the air diffuser 36 for circulation will be described in this order.
[Ejector diffuser 35]
The sediment advection mechanism supplies a large amount of bubbles at a time from the slightly lower side of the slit-shaped outlet 22a by the ejector aeration device 35, thereby ejecting the solid-liquid separation tank 2 by the ejector effect due to the upward flow of the bubbles. The deposit deposited on the slit-shaped outlet 22a is sucked into the anaerobic fermentation tank 3 side, and the effect of advancing the deposit is exhibited. At this time, the deposit of the deposited layer 22c deposited on the slit-shaped outlet 22a does not all flow at the same time, but always flows in the slit-shaped outlet 22a so that the deposited layer 22c of the deposit is maintained. Therefore, even if the precipitate is transferred from the solid-liquid separation tank 2 to the anaerobic fermentation tank 3 via the precipitate transfer section 22, the liquid phase in the anaerobic fermentation tank 3 immediately flows back to the solid-liquid separation tank 2. Although there is no, it is gradually returned to the solid-liquid separation tank 2 through the deposition layer 22c.

  On the other hand, the solid component in the anaerobic fermentation tank 3 cannot be transferred to the solid-liquid separation tank 2 by being blocked by the deposition layer 22c. As a result, in the anaerobic fermentation tank 3, the precipitate in the solid-liquid separation tank 2 flows in, but the solid components inside the anaerobic fermentation tank 3 are not returned to the solid-liquid separation tank 2, and the inside of the anaerobic fermentation tank 3. The microorganisms are prevented from flowing out of the anaerobic fermenter 3 and reduced, and good anaerobic fermentation can be maintained, and the operation state is maintained in which the sediment corresponding to the amount of solid components reduced by the anaerobic fermentation is sequentially replenished. be able to.

[Aeration device for circulation]
As shown in FIG. 1, the anaerobic fermentation space 32 on the sludge settling tank 5 side of the anaerobic fermentation tank 3 is provided with a heat exchanger 33 for maintaining the treated water in this space at a good temperature for methane fermentation. It has been. Specifically, the heat exchanger 33 is configured to include a heat medium head 33h up and down, and a plurality of tubes 33c through which the heat medium can flow between the pair of heat medium heads 33h. Therefore, the processing liquid in the anaerobic fermentation space 32 can be heated by circulating the heat medium from one heat medium head 33h to the other heat medium head 33h via the plurality of tubes 33c.

As can be seen from FIG. 1, the circulation air diffuser 36 is provided between the heat exchanger 33 and the partition wall W <b> 35, stirs the precipitate present in the anaerobic fermentation space 32, and convects the processing liquid. The structure which can be formed and can maintain the process liquid of the anaerobic fermentation space 32 at the temperature suitable for anaerobic fermentation (for example, 55 degreeC) by heat exchange with the heat exchanger 33 is employ | adopted.
Therefore, in the anaerobic fermentation tank 3, the precipitate can be continuously gasified and reduced by anaerobic fermentation, and biogas can be recovered.

  In the case of the above configuration, since the aeration by the ejector aeration device 35 and the circulation aeration device 36 supplies a part of the collected biogas from the biogas tank T by the anaerobic gas pump P1, an anaerobic fermentation tank The inside of 3 can be maintained in an anaerobic state. Moreover, if a large amount of aeration of about 70 L / min is performed for about 20 seconds about twice a day, the advection of the sediment according to the processing capacity of the anaerobic fermentation tank 3 can be continued, and a large capacity pump or the like can be used. It is possible to efficiently transfer the precipitate derived from the crushed food waste without using it.

[Sludge settling tank]
As shown in FIG. 1, a sludge settling tank 5 is provided between the anaerobic fermentation tank 3 and the aerobic treatment tank 4.
The upper end edge of the partition wall W45 that partitions the sludge settling tank 5 and the aerobic treatment tank 4 is positioned below the ceiling of the waste water treatment apparatus main body A, and the upper end edge 54 of the partition wall W45 is the sludge settling tank 5 And the liquid level position of the process liquid in the aerobic process tank 4 is comprised. As a result, the supernatant of the sludge settling tank 5 overflows the upper end edge 54 of the partition wall W45 and is transferred to the aerobic treatment tank 4. The upper end edge 54 of the partition wall W45 A second advection section 52 is configured.

  Sludge and treatment liquid are returned from the aerobic treatment tank 4 to the sludge settling tank 5 via the first return path 41, and anaerobic from the sludge settling tank 5 via the second return path 51. Sludge and processing liquid are returned to the fermenter 3.

  The first return path 41 supplies air to the lower portion of the vertical pipe portion 41a as pumping gas by the air pump P2, raises the water level in the pipe to the horizontal pipe connection height, and reaches the horizontal pipe connection height. The water is returned to the upstream side. An air supply passage (not shown) for sending air to the vertical pipe portion 41a of the first return path 41 is provided with an on-off valve V1 and a flow rate adjusting valve V2, and the vertical pipe portion 41a is formed by the on-off valve V1 and the flow rate adjusting valve V2. The supply air is intermittently adjusted and the amount of supply air is adjusted, so that the return of sludge and treatment liquid through the first return path 41 can be intermittently adjusted and the return amount can be adjusted.

  Further, the second return path 51 supplies the biogas in the biogas tank T as a pumping gas to the lower part of the vertical pipe portion 51a by the anaerobic gas pump P1, and raises the water level in the pipe to the horizontal pipe connection height. It is set as the structure which returns the to-be-processed water which reached the height upstream. An air supply passage (not shown) for sending biogas from the biogas tank T to the vertical pipe portion 51a of the second return passage 51 is provided with an on-off valve V1 and a flow rate adjusting valve V2, and the on-off valve V1 and the flow rate adjusting valve V2 In addition, the intermittent supply of air to the vertical pipe portion 51a and the adjustment of the supply amount are performed, so that the return and return of sludge and processing liquid through the second return path 51 can be adjusted and the return amount can be adjusted.

The sludge settling tank 5 employs a configuration that allows sludge to settle at the bottom. Then, a sludge settling tank aeration device 53 for supplying air from the air pump P2 to diffuse is provided, and a circulation flow is formed in the tank by the aeration from the sludge settling tank aeration device 53. It is.
Thereby, in the sludge settling tank 5, the supernatant liquid transferred from the solid-liquid separation tank 2 via the first transfer section 25, the sludge returned from the aerobic treatment tank 4 via the first return path 41, and The treatment liquid is further aerobically treated and purified, and the precipitated sludge generated in the sludge settling tank 5 is returned to the upstream anaerobic fermentation tank 3 via the second return path 51 and again in the anaerobic fermentation tank 3. It is configured to be processable.
In addition, in the 2nd return path 51, since anaerobic gas is used as gas for pumping, it can prevent that the upstream storage tank 1, the solid-liquid separation tank 2, and the anaerobic fermentation tank 3 are biased to aerobic. .

[Aerobic treatment tank]
In the wastewater treatment apparatus according to the present invention, the water quality level that can be discharged into the natural world by transferring the supernatant from the sludge settling tank 5 to the aerobic treatment tank 4 via the second advection section 52 and performing aerobic treatment. It is supposed to be used as a domestic septic tank that can be purified and drained.

The aerobic treatment tank 4 contains a large number of sponge-like carriers 43. In addition, an aerobic treatment tank aeration device 44 for supplying air by the air pump P2 and diffusing the air is supplied to the carrier 43 by supplying air from the aerobic treatment tank aeration device 44. An aerobic bacterium for aerobically treating the liquid in the tank 4 is grown, and a circulation flow in which the carrier 43 forms a fluidized bed can be formed in the tank.
In addition, a porous solid shielding body 45 is provided in the vicinity of the drain port 42 to suppress the mixing of solid components into the discharged wastewater that has been discharged, and a clean supernatant that does not contain solid components is discharged. As a configuration.

[Operation method of waste water treatment equipment, control configuration of control unit]
In the wastewater treatment apparatus of the present invention, the solid waste separation tank 2 from the storage tank 1 is adjusted to a plurality of adjustment amounts obtained by dividing the whole waste grinding treatment waste liquid with respect to the total waste waste treatment liquid received in the storage tank 1 during a predetermined period. Adjusts the amount of garbage pulverization wastewater to the convection process of transferring the garbage pulverization treatment waste liquid to the solid-liquid separation tank 2 by the amount of garbage pulverization treatment waste liquid, and stops the advection following the advection process to separate the liquid and solid The stationary method which accelerates sedimentation of the sediment in the tank 2 is repeated, and an operation method for treating the entire amount of the waste pulverization waste liquid for a predetermined period is executed.
Further, the raw water pump P3 is operated in the advection process to transfer the garbage pulverization waste liquid from the storage tank 1 to the solid-liquid separation tank 2 by an adjusted amount, and the raw water pump P3 is stopped for a stationary time in the stationary process.

  In the advection process and the stationary process, the amount of adjustment is such that the cleanness of the wastewater treated through the solid-liquid separation tank 2, the anaerobic fermentation tank 3, the sludge settling tank 5, and the aerobic treatment tank 4 is more than the allowable minimum cleanliness. It is set to be an excellent value.

And in this embodiment, the processing amount control means 61 (refer FIG. 2) which performs the above-mentioned driving | running method is provided.
The control unit 6 includes a CPU, a storage unit, and the like, which are known information processing means, and a processing amount control means 61 is configured using the control unit 6.

The control configuration of the control unit 6 will be further described.
In each processing period, the entire waste crushing waste liquid is transferred from the storage tank 1 to the solid-liquid separation tank 2 and processed, so that the storage tank 1 is substantially empty at the start of processing in each processing period. It has become.
At the start of each processing period, the controller 6 operates a feed pump (not shown) that supplies the waste crushing waste liquid to the storage tank 1 to crush the entire amount of garbage that needs to be processed in a predetermined period. The processing waste liquid is continuously supplied to the storage tank 1 at a relatively high supply speed.
Further, the processing amount control means 61 of the control unit 6 performs the advection process by operating the raw water pump P3 for the advection time substantially simultaneously with the start of the operation of the feed pump, and then stops the raw water pump P3 for the rest time. The process is executed, and thereafter, the processing process including the advection process and the stationary process is repeated until the entire amount of the waste crushing waste liquid is transferred from the storage tank 1 to the solid-liquid separation tank 2.

Specifically, for example, when the predetermined period is set to 1 day and the total amount of the waste crushing waste liquid is 350 L (liter) / day, for example, the raw water pump P3 is used to transfer the storage tank 1 to the solid-liquid separation tank 2 In addition to setting the advection speed of the waste crushing waste liquid to 7.29 L / min, the advection time, that is, the time required for the advection process is set to 1 minute, and the adjustment amount is set to 7.29 L. Further, the standing time, that is, the time required for the standing process is set to 29 minutes, and the time required for the processing step including the advection process and the standing process is set to 30 minutes.
That is, it is possible to process a total amount of 350 liters of garbage crushing waste liquid per day by repeating the treatment process including the advection process and the stationary process 48 times in units of 30 minutes.

  By performing the above-described operation method, the raw water pump P3 is used to grind the garbage from the storage tank 1 to the solid-liquid separation tank 2 at a relatively low advection speed of 7.29 L / min for one minute of the advection time. The waste liquid is transferred by an adjusted amount, and after the transfer, the transfer of the waste crushing waste liquid from the storage tank 1 to the solid-liquid separation tank 2 is stopped for 29 minutes during the standing time. Garbage pulverization waste liquid is allowed to stand. In addition, when the raw water pump P3 transfers the garbage pulverization waste liquid from the storage tank 1 to the solid-liquid separation tank 2, the raw water pump P3 further pulverizes the solid content of the garbage pulverization waste liquid. Anaerobic fermentation of the precipitate in the fermenter 3 is further promoted.

Therefore, the turbulence of the garbage pulverization treatment waste liquid accompanying the transfer of the garbage pulverization treatment waste liquid to the solid-liquid separation tank 2 is sufficiently suppressed, and the solid liquid is stopped by stopping the transfer of the garbage pulverization treatment waste liquid in the stationary process. Since the sedimentation of the precipitate in the separation tank 2 is promoted, the solid-liquid separation is favorably performed in the solid-liquid separation tank 2. Then, the liquid phase supernatant having a low solid content is transferred from the solid-liquid separation tank 2 to the sludge settling tank 5 through the first transfer section 25, and the supernatant having a low solid content is also transferred. Since the second advection section 52 moves the sludge settling tank 5 to the aerobic treatment tank 4, the amount of solids transferred to the aerobic treatment tank 4 can be sufficiently reduced. Further, the sludge and the treatment liquid are returned from the aerobic treatment tank 4 to the sludge settling tank 5 through the first return path. Therefore, these synergistic effects can effectively reduce the load of the aerobic treatment in the aerobic treatment tank 4.
As a result, the cleanliness of the waste water discharged from the aerobic treatment tank 4 can be effectively improved. Moreover, since the anaerobic fermentation of the precipitate in the anaerobic fermenter 3 is further promoted, the amount of biogas produced can be increased and the volume reduction of the waste can be promoted.

Next, the result of having verified that the cleanliness of the waste water discharged from the aerobic treatment tank 4 can be improved by executing the operation method according to the present invention will be described.
In the verification, when the operation method according to the present invention is executed under the above-described operation conditions and when the comparative operation method is executed, the T-COD of the processing liquid transferred to the aerobic treatment tank 4 and the aerobic The T-COD of the waste water discharged from the treatment tank 4 was compared.
As an operation method for comparison, the conventional waste water treatment apparatus described above, that is, the waste grinding waste liquid is transferred from the storage tank 1 to the solid-liquid separation tank 2 in the overflow form, and the liquid phase is solid in the overflow form. In the wastewater treatment apparatus configured to transfer from the liquid separation tank 2 to the aerobic treatment tank 3, the entire amount of 350 L of waste crushing waste liquid is continuously transferred from the storage tank 1 to the solid-liquid separation tank 2 at 38.5 L / min. The driving method was used.

As a result of the verification, the T-COD of the treatment liquid transferred to the aerobic treatment tank 4 is 700 mg / L in the operation method according to the present invention and 6900 mg / L in the comparative operation method, and is discharged from the aerobic treatment tank 4. The T-COD of the wastewater was 600 mg / L in the operation method according to the present invention, and 5000 mg / L in the comparative operation method.
By the way, when processing the waste pulverization waste liquid with this waste water treatment device and discharging the treated waste water, the allowable minimum cleanness, which is a preferable cleanness of waste water, is 1000 mg / L in T-COD, for example. .
Therefore, by executing the operation method according to the present invention, the waste pulverization treatment waste liquid can be purified and discharged so that the cleanliness is a value superior to the allowable minimum cleanliness.

[Second Embodiment]
Next, a second embodiment will be described. This second embodiment mainly describes another embodiment of the advection means M. The configuration other than the advection means M is the same as that of the first embodiment. It is the same. Therefore, in order to avoid redundant description, the same components as those in the first embodiment and the components having the same functions are denoted by the same reference numerals, and the description thereof is omitted. Mainly, the advection means M and the components related thereto. explain.

As shown in FIG. 3 and FIG. 4, in the second embodiment, a tubular third advection portion 26 for advancing the liquid phase from the solid-liquid separation tank 2 to the aerobic treatment tank 3 is provided as the advection means M.
Similarly to the first embodiment, the first return path 41 returns the sediment from the aerobic treatment tank 4 to the sludge settling tank 5, and returns the precipitate from the sludge settling tank 5 to the anaerobic fermentation tank 3. The second return path 51 is provided, and the carrier gas in the second return path 51 is anaerobic gas. Then, the return path R constituted by a second return path 51, the return passage R, is arranged to return the sludge settling tank 5 by sedimentation separated precipitate anaerobic fermenter 3.

  In the second embodiment, the sludge settling tank 5 and the aerobic treatment tank 4 are independent tanks, and the overflow-like second advection section 52 provided in the first embodiment is provided in the second embodiment. Not.

The tubular third advection portion 26 has a base end positioned slightly below the upper end edge 27 of the partition wall W23 in the solid-liquid separation tank 2, and a tip end in the gas phase region above the aerobic treatment tank 4. It is located and arranged.
As described in the first embodiment, a large amount of biogas is generated in the anaerobic fermentation tank 3, and the gas phase region of the anaerobic fermentation tank 3 and the gas phase region of the solid-liquid separation tank 2 communicate with each other. Therefore, the gas phase region of the solid-liquid separation tank 2 has a higher pressure than the gas phase region of the aerobic treatment tank 4.
Therefore, the supernatant of the solid-liquid separation tank 2 flows into the third advection section 26 from its base end due to the pressure difference between the gas-phase area of the solid-liquid separation tank 2 and the gas-phase area of the aerobic treatment tank 4. Then, it can be transferred to the aerobic treatment tank 4 through the third transfer part 26.

In the sludge settling tank 5 of the second embodiment, the sludge and the processing liquid are returned from the aerobic treatment tank 4 through the first return path 41 and the second return path 51 is supplied from the sludge settling tank 5. The sludge and the processing liquid are returned to the anaerobic fermenter 3 via
In the sludge settling tank 5, the sludge and treatment liquid returned from the aerobic treatment tank 4 through the first return path 41 are further aerobically treated and purified, and the precipitated sludge generated in the sludge settling tank 5 is purified. It returns to the upstream anaerobic fermenter 3 via the 2nd return path 51, and it is comprised so that processing in the anaerobic fermenter 3 is possible again.
As in the first embodiment, in the second return path 51, anaerobic gas is used as the pumping gas. Therefore, the upstream storage tank 1, the solid-liquid separation tank 2, and the anaerobic fermentation tank 3 are preferred. It is possible to prevent biasing to temper.

  In addition, the supernatant liquid is transferred from the solid-liquid separation tank 2 to the aerobic treatment tank 4 of the second embodiment via the third advection section 26, and the supernatant liquid is aerobically treated in the aerobic treatment tank 4. Is done.

  That is, the wastewater treatment apparatus of the second embodiment precipitates and separates the waste pulverization waste liquid received from the receiving port 11 in the solid-liquid separation tank 2, and the precipitate is biogas by anaerobic fermentation in the anaerobic fermentation tank 3. The biogas is taken out from the biogas outlet 31 through the biogas outlet 37, the liquid phase is purified by aerobic treatment in the aerobic treatment tank 4, and discharged from the drain port 42 as clean wastewater. It has a configuration.

  Also in the second embodiment, as in the first embodiment, the advection process and the stationary process are repeated, and the operation method of the present invention is performed in which the entire amount of the waste pulverization waste liquid is processed for a predetermined period. And the throughput control means 61 (refer FIG. 4) which performs this operation method is provided.

As in the first embodiment, by performing the operation method of the present invention, the solid-liquid separation is performed well in the solid-liquid separation tank 2 as described in the first embodiment. Is called.
And since the liquid phase supernatant liquid with a small solid content is transferred from the solid-liquid separation tank 2 to the aerobic treatment tank 4 through the third advection part 26, the solid transferred to the aerobic treatment tank 4. The amount of minutes can be reduced sufficiently. Further, the sludge and the treatment liquid are returned from the aerobic treatment tank 4 to the sludge settling tank 5 through the first return path. Therefore, these synergistic effects can effectively reduce the load of the aerobic treatment in the aerobic treatment tank 4.
As a result, the cleanliness of the waste water discharged from the aerobic treatment tank 4 can be effectively improved. Moreover, since the anaerobic fermentation of the precipitate in the anaerobic fermenter 3 is further promoted, the amount of biogas produced can be increased and the volume reduction of the waste can be promoted.

[Another embodiment]
Next, another embodiment will be described.
(I) The garbage pulverization treatment waste liquid advection configuration for transferring the garbage pulverization treatment waste liquid from the storage tank 1 to the solid-liquid separation tank 2 is the structure exemplified in each of the first and second embodiments, that is, the storage tank. However, the present invention is not limited to the configuration in which the transfer channel 12 is provided across the solid-liquid separation tank 2 and the raw water pump P3 is provided in the transfer channel 12.
For example, the storage tank 1 is provided above the solid-liquid separation tank 2, and a downflow path is provided to allow natural waste pulverization treatment waste liquid to flow from the storage tank 1 to the solid-liquid separation tank 2, and an open / close valve is provided in the downflow path. Thus, the waste crushing waste liquid advection configuration is constituted by these downflow passages and on-off valves.
In executing the operation method of the present application, in the advection step, the on-off valve is opened during the advection time, and in the standing step, the on-off valve is closed during the standing time.

(B) In each of the first and second embodiments described above, the interior of the waste water treatment apparatus main body A is partitioned by the four partition walls W12, W23, W35, and W45, so that the storage tank is disposed in the waste water treatment apparatus main body A. 1, the solid-liquid separation tank 2, the anaerobic fermentation tank 3, the sludge settling tank 5 and the aerobic treatment tank 4 are integrally configured, but the storage tank 1, the solid-liquid separation tank 2, the anaerobic fermentation tank 3, and the sludge settling tank 5 Each of the aerobic treatment tanks 4 may be constituted by independent tanks.

(C) In each of the first and second embodiments described above, the processing amount control unit 61 is configured to automatically and repeatedly execute the advection process and the stationary process. May be repeatedly executed by manual operation.

  As described above, it is possible to provide a wastewater treatment apparatus that can improve the cleanliness of the wastewater that is purified and discharged, and a method for operating the wastewater treatment apparatus.

1 Reservoir (receiving part)
2 solid-liquid separation tank 3 anaerobic fermentation tank 4 aerobic treatment tank 5 sludge settling tank 12 transfer path 21 liquid phase transfer section 22 sediment transfer section 25 first transfer section 26 third transfer section 41 first return path 51 second return Path 52 second advection section 61 throughput control means M advection means P3 raw water pump R return path

Claims (13)

Establishing a receiving section for receiving waste pulverization waste liquid
A solid-liquid separation tank for transferring the garbage pulverization waste liquid from the receiving part to precipitate and separate the garbage pulverization waste liquid;
An anaerobic fermentation tank that accepts the precipitate separated in the solid-liquid separation tank and converts it to biogas;
A sludge settling tank for receiving the liquid phase of the solid-liquid separation tank;
A wastewater treatment apparatus provided with an aerobic treatment tank that accepts the liquid phase of the sludge settling tank and performs an aerobic treatment,
The sludge settling tank is a structure in which precipitates are precipitated separated by the aerobic treatment tank Ru is returned,
A liquid phase advection part for advancing the liquid phase from the solid-liquid separation tank to the anaerobic fermentation tank, and a precipitate advection part for advancing the precipitate of the solid-liquid separation tank to the anaerobic fermentation tank ,
While providing advection means for advancing the liquid phase from the solid-liquid separation tank to the sludge settling tank ,
Providing a return path for returning the sediment separated in the sludge settling tank to the anaerobic fermentation tank;
With respect to the total amount of waste grind processing waste liquid received by the receiving unit in a predetermined period, the amount of waste grind processing waste liquid from the receiving unit to the solid-liquid separation tank is divided into a plurality of adjustment amounts obtained by dividing the total amount of waste grind processing waste liquid. And a convection step for advancing the garbage pulverization treatment waste liquid to the solid-liquid separation tank by the amount of the garbage pulverization treatment waste liquid, and stopping the advection following the advection process to precipitate in the solid-liquid separation tank A wastewater treatment apparatus provided with a treatment amount control means for repeating the stationary step for promoting sedimentation of the object and treating the whole waste crushing waste liquid during the predetermined period. A first advection part for advancing the liquid phase from the solid-liquid separation tank to the sludge settling tank is provided as the advection means, and a second advection part for transferring the liquid phase from the sludge settling tank to the aerobic treatment tank is provided. ,
The provided with a first return passage for returning the precipitate from the aerobic treatment tank to said sludge settling tank, the return path for returning the precipitate separated precipitate in the sludge settling tank to the anaerobic fermentation tank, the second Provided as a return path,
The waste water treatment apparatus according to claim 1, wherein the carrier gas in at least the second return path is an anaerobic gas. Establishing a receiving section for receiving waste pulverization waste liquid
A solid-liquid separation tank for transferring the garbage pulverization waste liquid from the receiving part to precipitate and separate the garbage pulverization waste liquid;
An anaerobic fermentation tank that accepts the precipitate separated in the solid-liquid separation tank and converts it to biogas;
A wastewater treatment apparatus provided with an aerobic treatment tank that receives the liquid phase of the solid-liquid separation tank and performs an aerobic treatment,
A sludge settling tank is provided to return the sediment separated by precipitation in the aerobic treatment tank,
A liquid phase advection part for advancing the liquid phase from the solid-liquid separation tank to the anaerobic fermentation tank, and a precipitate advection part for advancing the precipitate of the solid-liquid separation tank to the anaerobic fermentation tank,
While providing advection means for advancing the liquid phase from the solid-liquid separation tank to the aerobic treatment tank,
Providing a return path for returning the sediment separated in the sludge settling tank to the anaerobic fermentation tank;
With respect to the total amount of waste grind processing waste liquid received by the receiving unit in a predetermined period, the amount of waste grind processing waste liquid from the receiving unit to the solid-liquid separation tank is divided into a plurality of adjustment amounts obtained by dividing the total amount of waste grind processing waste liquid. And a convection step for advancing the garbage pulverization treatment waste liquid to the solid-liquid separation tank by the amount of the garbage pulverization treatment waste liquid, and stopping the advection following the advection process to precipitate in the solid-liquid separation tank A wastewater treatment apparatus provided with a treatment amount control means for repeating the stationary step for promoting sedimentation of the object and treating the whole waste crushing waste liquid during the predetermined period. A third advection part for advancing the liquid phase from the solid-liquid separation tank to the aerobic treatment tank is provided as the advection means;
The provided with a first return passage for returning the precipitate from the aerobic treatment tank to said sludge settling tank, the return path for returning the precipitate separated precipitate in the sludge settling tank to the anaerobic fermentation tank, the second Provided as a return path,
The wastewater treatment apparatus according to claim 3 , wherein the carrier gas in at least the second return path is an anaerobic gas. Provided with a transfer passage for transferring the waste grinding waste liquid received in the receiving section to the solid-liquid separation tank, and equipped with a raw water pump that can be intermittently driven in the transfer passage,
In the processing amount control means, the raw water pump is operated in the advection step to transfer the garbage pulverization waste liquid from the receiving unit to the solid-liquid separation tank by the adjusted amount, and in the stationary step, the raw water The wastewater treatment apparatus according to any one of claims 1 to 4 , wherein the pump is stopped for a stationary time. The wastewater treatment apparatus according to claim 5 , wherein the solid content of the garbage pulverization waste liquid transferred from the receiving unit to the solid-liquid separation tank is further pulverized by the operation of the raw water pump. In the advection process and the stationary process, the cleanliness of the wastewater treated through the solid-liquid separation tank, the anaerobic fermentation tank, the sludge settling tank, and the aerobic treatment tank is superior to the allowable minimum cleanliness. The wastewater treatment apparatus according to any one of claims 1 to 6 , wherein the adjustment amount is set so as to be a value. Establishing a receiving section for receiving waste pulverization waste liquid
A solid-liquid separation tank for transferring the garbage pulverization waste liquid from the receiving part to precipitate and separate the garbage pulverization waste liquid;
An anaerobic fermentation tank that accepts the precipitate separated in the solid-liquid separation tank and converts it to biogas;
A sludge settling tank for receiving the liquid phase of the solid-liquid separation tank;
An operation method of a wastewater treatment apparatus provided with an aerobic treatment tank that accepts the liquid phase of the sludge settling tank and performs an aerobic treatment,
The sludge settling tank is a structure in which precipitates are precipitated separated by the aerobic treatment tank Ru is returned,
A liquid phase advection part for advancing the liquid phase from the solid-liquid separation tank to the anaerobic fermentation tank, and a precipitate advection part for advancing the precipitate of the solid-liquid separation tank to the anaerobic fermentation tank ,
While providing advection means for advancing the liquid phase from the solid-liquid separation tank to the sludge settling tank ,
Providing a return path for returning the sediment separated in the sludge settling tank to the anaerobic fermentation tank;
With respect to the total amount of waste grind processing waste liquid received by the receiving unit in a predetermined period, the amount of waste grind processing waste liquid from the receiving unit to the solid-liquid separation tank is divided into a plurality of adjustment amounts obtained by dividing the total amount of waste grind processing waste liquid. And a convection step for advancing the garbage pulverization treatment waste liquid to the solid-liquid separation tank by the amount of the garbage pulverization treatment waste liquid, and stopping the advection following the advection process to precipitate in the solid-liquid separation tank The operation method of the waste water treatment equipment which repeats the stationary process which promotes sedimentation of a thing, and processes the above-mentioned garbage grinding processing waste liquid whole quantity in the above-mentioned predetermined period. A first advection part for advancing the liquid phase from the solid-liquid separation tank to the sludge settling tank is provided as the advection means, and a second advection part for transferring the liquid phase from the sludge settling tank to the aerobic treatment tank is provided. ,
The provided with a first return passage for returning the precipitate from the aerobic treatment tank to said sludge settling tank, the return path for returning the precipitate separated precipitate in the sludge settling tank to the anaerobic fermentation tank, the second Provided as a return path,
The operation method of the waste water treatment apparatus according to claim 8 , wherein the carrier gas in at least the second return path is an anaerobic gas. Establishing a receiving section for receiving waste pulverization waste liquid
A solid-liquid separation tank for transferring the garbage pulverization waste liquid from the receiving part to precipitate and separate the garbage pulverization waste liquid;
An anaerobic fermentation tank that accepts the precipitate separated in the solid-liquid separation tank and converts it to biogas;
An operation method of a wastewater treatment apparatus provided with an aerobic treatment tank that receives the liquid phase of the solid-liquid separation tank and performs an aerobic treatment,
A sludge settling tank is provided to return the sediment separated by precipitation in the aerobic treatment tank,
A liquid phase advection part for advancing the liquid phase from the solid-liquid separation tank to the anaerobic fermentation tank, and a precipitate advection part for advancing the precipitate of the solid-liquid separation tank to the anaerobic fermentation tank,
While providing advection means for advancing the liquid phase from the solid-liquid separation tank to the aerobic treatment tank,
Providing a return path for returning the sediment separated in the sludge settling tank to the anaerobic fermentation tank;
With respect to the total amount of waste grind processing waste liquid received by the receiving unit in a predetermined period, the amount of waste grind processing waste liquid from the receiving unit to the solid-liquid separation tank is divided into a plurality of adjustment amounts obtained by dividing the total amount of waste grind processing waste liquid. And a convection step for advancing the garbage pulverization treatment waste liquid to the solid-liquid separation tank by the amount of the garbage pulverization treatment waste liquid, and stopping the advection following the advection process to precipitate in the solid-liquid separation tank The operation method of the waste water treatment equipment which repeats the stationary process which promotes sedimentation of a thing, and processes the above-mentioned garbage grinding processing waste liquid whole quantity in the above-mentioned predetermined period. A third advection part for advancing the liquid phase from the solid-liquid separation tank to the aerobic treatment tank is provided as the advection means;
A first return path for returning the sediment from the aerobic treatment tank to the sludge settling tank is provided, and a second return path for returning the precipitate separated and separated in the sludge settling tank to the anaerobic fermentation tank, Provided as a return path,
The operation method of the waste water treatment apparatus according to claim 10, wherein the carrier gas in at least the second return path is an anaerobic gas. Provided with a transfer passage for transferring the waste grinding waste liquid received in the receiving section to the solid-liquid separation tank, and equipped with a raw water pump that can be intermittently driven in the transfer passage,
The raw water pump is operated in the advection step to transfer the garbage grinding waste liquid from the receiving unit to the solid-liquid separation tank by the adjusted amount, and the raw water pump is stopped for a standing time in the standing step. The operation method of the waste water treatment apparatus of any one of Claims 8-11 . In the advection process and the stationary process, the cleanliness of the wastewater treated through the solid-liquid separation tank, the anaerobic fermentation tank, the sludge settling tank, and the aerobic treatment tank is superior to the allowable minimum cleanliness. The operation method of the waste water treatment apparatus according to any one of claims 8 to 12 , wherein the adjustment amount is set so as to be a value.

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