JP4807966B2 - Organic wastewater treatment method and system - Google Patents

Description

The present invention relates to a technology for biological treatment after pretreatment of organic wastewater such as septic tank sludge wastewater and human waste wastewater, and in particular, improves the dewatering efficiency in pretreatment and effectively uses dehydrated sludge as fuel, composting, etc. The present invention relates to an organic wastewater treatment method and system.

In the treatment of organic waste water, it is common to perform pretreatment such as removal of impurities and dehydration in order to efficiently and smoothly perform this biological treatment before the biological treatment. A conventional organic wastewater treatment with such pretreatment is shown in FIG. 6 (see Patent Document 1). First, after removing contaminants from the organic wastewater received by the contaminant removal facility 51, a flocculant is added to the debris and introduced into the dehydration facility 52, and then a centrifuge, belt press, etc. The dewatering equipment 52 dehydrates the sludge while performing solid-liquid separation, and the dehydrated separation liquid is put into the biological treatment equipment 53 using the floating sludge system, mainly for processing BOD, TN (total nitrogen), etc. The biological treatment liquid is solid-liquid separated by the solid-liquid separation device 54, and the supernatant liquid is subjected to advanced treatment such as coagulation separation and activated carbon treatment by the advanced treatment equipment 55 to obtain TP (phosphorus), COD, After removing the chromaticity component, it was discharged out of the system.
On the other hand, surplus sludge 57 and agglomerated sludge 58 generated in the solid-liquid separation facility 54 are dehydrated by mixing with organic waste water in the dehydration facility 52, or the excess sludge 57 and the agglomerated sludge 58 are independently dehydrated. Was.

In a treatment system equipped with such a dehydration facility, the dewatered sludge obtained by dehydration has been treated in the sludge treatment facility by methane fermentation, dehydration, composting, buffering, incineration, or a combination of these.
Here, examples of the organic wastewater to be treated include human waste and septic tank sludge. Human waste is live urine discharged from a flush toilet. In addition, the septic tank sludge, combined treatment septic tank, community plant, rural waste water facilities, fishing village waste water facilities, are collected from a single processing septic tank, etc., biological treatment raw sewage and life waste water and the like is at once each of the facility This is the biological treatment residue after

In recent years, in view of the improvement of the recycling rate of waste as a whole and efficient treatment, there are cases where the moisture content is dehydrated to 70% or less in a dehydration facility, and this dewatered sludge is transported to a garbage incineration facility or the like as fuel. Thus, making the dewatered sludge into a form that can be used as a fuel is a very useful method for resource recycling.
Therefore, in order to improve the dehydration efficiency, it is effective to perform the dehydration treatment in a state where the organic fibrous substance is contained in the treatment target.
However, in the conventional method described in Patent Document 1 and the like, contaminants are removed before dehydration, and almost all fibrous substances are removed as contaminants. Therefore, it is difficult to maintain high dewaterability. Met.
Therefore, Patent Document 2 (Japanese Patent Application Laid-Open No. 2002-219500) proposes a method of adding synthetic fibers and an aggregating agent to organic sludge and aggregating them, followed by a dehydration process. This makes it possible to improve dehydration.

Japanese Patent No. 33688938 JP 2002-219500 A

As described above, in the configuration provided with the contaminant removal equipment such as Patent Document 1, the coarse fiber content in the processing liquid is removed when the foreign matter such as paper and vinyl is removed in the contaminant removal equipment. For this reason, in the dehydration facility, the dewaterability is deteriorated, and it has been difficult to keep the water content of the dewatered sludge low. In order to reduce the moisture content of the dewatered sludge, there is a problem that the amount of dehydration aid such as a flocculant used is increased, and the operation is performed at the expense of the solid material recovery rate. As the rate decreases, pollutants such as BOD and TN also flow out to the subsequent stage, which causes a problem of increasing the load on the biological treatment facility in the subsequent stage.
In addition, when a membrane separation apparatus is employed as the solid-liquid separation facility, it contributes to improving the dewaterability of the sludge in the excess sludge because the fiber components agglomerated by biological treatment are removed before the membrane separation. The fiber content did not remain and the problem became more serious.
Furthermore, as described in Patent Document 2, when waste plastic such as PET is processed into a fiber and supplied to a dehydration facility, the waste plastic remains in the dewatered sludge. When this dewatered sludge is supplied to the incineration facility as solid fuel, there is no problem, but when dewatered sludge is composted, the waste plastic cannot be decomposed in the composting facility and remains in the compost. It was.
Therefore, in view of the above-mentioned problems of the prior art, the present invention can improve the efficiency of dehydration in the pretreatment process without increasing the amount of chemicals such as a dehydration aid, and further, the resource recycling rate of the entire waste It is an object of the present invention to provide an organic wastewater treatment method and system capable of improving the efficiency.

Therefore, in order to solve such a problem, the present invention, after pretreatment of septic tank sludge wastewater containing a large amount of solid pollutants and wastewater urine wastewater containing vinyl that causes clogging of piping, the septic tank sludge wastewater and In the organic wastewater treatment method for biologically treating the human wastewater and deodorizing the odor gas in the system,
A first pretreatment step of separating the wastewater wastewater into a contaminant containing a vinyl and a contaminant separation liquid on a coarse screen;
And a second pretreatment step of dehydrating the septic tank sludge wastewater with a dehydration facility to obtain a dehydrated sludge and a dehydrated separation solution, and the contaminant separation liquid obtained in the first and second pretreatment steps. And the biological treatment by mixing the dehydrated separation liquid and
In the second pretreatment step, the septic tank sludge wastewater is mixed with vinyl-containing contaminants, surplus sludge after biological treatment in the latter stage and agglomeration treatment sludge, crushed by a crusher, and then supplied with a dehydration aid. Is a pretreatment step in which a dehydration aid is added by means, introduced into a dehydration facility, and dehydrated to a predetermined moisture content ,
On the other hand, the deodorizing treatment comprises a combination of an acid cleaning section and an alkali cleaning section, and the acid cleaning waste liquid from the acid cleaning section and the alkali cleaning waste liquid from the alkali cleaning section are separately collected, and the second Introduce into each target part of the pretreatment of
The target site where the alkaline cleaning waste liquid is introduced is a site where the alkaline cleaning waste liquid causes a saponification reaction of the oil and fat components derived from domestic waste water contained in the septic tank sludge waste water, and the acid cleaning waste liquid is introduced. The target site is a site where the pH of the sludge wastewater to be dehydrated is shifted to the acidic side by the acid washing waste liquid to improve the cohesiveness .
Further, in the pretreatment, at least a part of the organic waste water is branched, and the branched organic waste water is subjected to removal of contaminants to obtain a contaminant separation liquid, and the other organic waste water is dehydrated. The biological treatment may be performed by obtaining a dehydrated separation liquid and mixing the contaminant separation liquid and the dehydrated separation liquid.

According to these inventions, the septic tank sludge is dehydrated by a dehydration facility and has a second pretreatment step for obtaining dehydrated sludge and a dehydrated separation liquid, and is obtained in the first and second pretreatment steps. The biological treatment is performed by mixing the obtained contaminant separation liquid and the dehydration separation liquid, and the second pretreatment step causes the septic tank sludge to be agglomerated by injecting a dehydration aid as a dehydration pretreatment. Pretreatment to obtain the dewatered sludge and dehydrated separation liquid by mixing the agglomerated sludge with the contaminants containing the vinyl and the surplus sludge after the biological treatment in the latter stage and dewatering the mixed sludge to a predetermined moisture content Since it is a process, since the dehydrating property is improved by using vinyl contained in the contaminants, dehydration with high efficiency, low water content, and high solids recovery rate is possible. In addition, due to the effect of improving the dehydration property, the amount of dehydration aid used can be reduced, and the cost can be reduced. Furthermore, since the sludge removability on the dewatering surface in the dewatering facility is improved, troubles due to clogging can be prevented and the amount of washing water can be greatly reduced. In addition, by reducing the amount of washing water, it is possible to reduce the size of equipment in the subsequent biological treatment, solid-liquid separation, and advanced treatment. Furthermore, the removal of impurities and the dehydration can be unified, and the number of devices can be reduced.
Moreover, as a system of the present invention, a septic tank sludge receiving tank containing a large amount of solid pollutant, a vinyl containing vinyl causing clogging of piping, a urine receiving water receiving tank, and a deodorizing process for deodorizing odor gas in the system In an organic wastewater treatment system equipped with equipment,
A first pretreatment unit for separating human waste wastewater from the human waste receiving tank into a foreign matter containing a vinyl and a foreign matter separation liquid with a coarse screen;
In the septic tank sludge wastewater from the septic tank sludge receiving tank, the waste containing the vinyl, the surplus sludge after the biological treatment in the latter stage and the coagulation treated sludge are mixed and crushed with a crusher, and then dehydrated auxiliary agent supply means A second pretreatment unit to which a dehydration aid is added and introduced into a dehydration facility, and dehydrated to a predetermined moisture content to obtain a dewatered sludge and a dehydrated separation liquid;
The biological treatment unit that mixes the contaminant separation liquid obtained in the first and second processing units and the dehydration separation liquid ,
On the other hand, the deodorization equipment comprises a combination of an acid cleaning section and an alkali cleaning section, and the acid cleaning waste liquid from the acid cleaning section and the alkali cleaning waste liquid from the alkali cleaning section are separately collected, respectively. Introduce into the target part of pretreatment,
The target site where the alkaline cleaning waste liquid is introduced is a site where the alkaline cleaning waste liquid causes a saponification reaction of the oil and fat components derived from domestic waste water contained in the septic tank sludge waste water, and the acid cleaning waste liquid is introduced. An organic wastewater treatment system is proposed in which the target site is a site where the pH of sludge wastewater to be dehydrated is shifted to the acidic side by the acid washing waste liquid to improve cohesion .

In addition, the present invention reduces the inflow load to biological treatment efficiently and becomes unstable by dehydrating only solid septic tank sludge, which contains a large amount of solid pollutants and has severe property fluctuations, compared to human waste. Can be achieved. Further, contaminants in human waste includes vinyl as the clogging cause piping to together as a coarse. Therefore, stable sludge dewatering can be achieved by using only the impurities in the septic tank sludge having a relatively fine particle size and homogeneity.

Further, the sludge is crushed before the dehydration. Thereby, malfunctions, such as clogging of a dehydration equipment, can be prevented.
Furthermore, after obtaining the concentrated sludge and concentrate separated was concentrated by adding a dehydrating aid to the sludge, the concentrated sludge to the dewatering, the dewatered separation liquid and the concentrate separated liquid may be the biological treatment.
By dewatering after concentrating the sludge in this way, the amount of water flowing into the dewatering can be reduced, so the dewatering equipment can be made compact and low power, and the amount of dewatering aid used can be reduced. It becomes.
Furthermore, a fibrous material is supplied to the sludge upstream of the dehydration.
Examples of the fibrous substance include waste paper and plastic crushed material. Thereby, the dehydrating property can be improved due to the fiber component, the amount of dehydration aids such as expensive inorganic flocculants and polymer flocculants can be reduced, and the cost can be reduced.

Further, it is a sludge treatment method for deodorizing at least odor gas in the system by alkali cleaning, wherein the alkali cleaning waste liquid generated by the alkali cleaning is supplied to the sludge receiving tank. Thereby, the oil and fat component derived from domestic wastewater contained in the septic tank sludge is dispersed by the saponification reaction, and it becomes possible to prevent clogging of the pump and blockage of the piping.
Further, the sludge treatment method for deodorizing the odor gas in the system by at least acid cleaning, wherein the acid cleaning waste liquid generated by the acid cleaning is supplied to the sludge before the dehydration. . This is because the cohesiveness is improved by shifting the pH of the dewatered sludge to the acidic side, so that the dewatering efficiency in dewatering can be improved and the supply amount of the dewatering aid can be greatly reduced.

Further, as a system invention, in a sludge treatment system comprising a pretreatment facility for pretreating sludge containing septic tank sludge, and a biological treatment facility for biologically treating the pretreated treatment liquid,
The pretreatment facility is a dewatering facility that dehydrates the sludge as it is without removing impurities.
The pretreatment facility comprises the dehydration facility and a contaminant removal facility provided in parallel with the dehydration facility, and at least a part of the sludge is branched and introduced into the dehydration facility. Another sludge is introduced into the contaminant removal facility, and the dehydrated separation liquid from the dehydration facility and the contaminant separation liquid from the contaminant removal facility are introduced into the biological treatment facility.

In addition, a septic tank sludge receiving tank for receiving septic tank sludge mainly composed of septic tank sludge, and a urine receiving tank for receiving human waste wastewater mainly composed of human waste,
The pretreatment facility comprises the dehydration facility and a contaminant removal facility provided in parallel with the dehydration facility,
With introducing sludge from the septic tank sludge receiving tank to the dewatering equipment, introducing raw sewage wastewater from the human waste receiving vessel to said contaminant removal system, the dehydration separated liquid and the contaminant removal equipment from the dewatering equipment It is preferable to introduce the foreign matter separation liquid into the biological treatment facility.

Furthermore, it is preferable to provide a crushing means for crushing the septic tank sludge on the upstream side of the dehydration equipment.
Furthermore, it is preferable that the pretreatment facility includes a dehydration aid supply means for supplying a dehydration aid and a concentration facility for concentrating the sludge supplied with the dehydration aid on the upstream side of the dehydration facility. .
Et al is provided with a deodorizing equipment for deodorizing odorous gases in the system, the deodorizing facility has an acid cleaning means and an alkali washing means, supplies the alkali washing waste liquid from the alkaline cleaning means receiving vessel of the sludge The acid cleaning waste liquid from the acid cleaning tower is preferably supplied to the upstream side of the dehydration facility .

As described above, according to the present invention, low moisture content and high solids recovery rate dehydration can be realized with high efficiency by effectively utilizing a substance having an effect of improving sludge dewaterability existing in the system. . In addition, it is possible to reduce the amount of dehydration aid added from the outside and to perform dehydration with low power.
Furthermore, the dehydration efficiency can be further improved by effectively using the waste liquid in the deodorization equipment.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention unless otherwise specified, but are merely illustrative examples. Not too much.
The organic wastewater to be treated in the present invention is septic tank sludge, human waste, or sludge (waste water) such as waste liquid mixed with these. The septic tank sludge refers to sludge collected from merged treatment septic tanks, community plants, agricultural settlement wastewater facilities, fishery village wastewater facilities, single treatment septic tanks, etc. Say human waste.
1 to 5 are general block diagrams of an organic wastewater treatment system according to an embodiment (reference example) of the present invention.
[ Reference Example 1]

The organic wastewater treatment system according to Reference Example 1 shown in FIG. 1 is configured to treat sludge containing septic tank sludge, but other sludge such as human waste may be mixed. As shown in the figure, this sludge treatment system is provided in parallel with the contaminant removal equipment 1 into which at least a part of the sludge (waste water) 20 is introduced from the upstream to the downstream of the line. The dehydration facility 2 into which the sludge 20 is introduced, the contaminant separation liquid from which the contaminants have been removed by the contaminant removal facility 1, and the dehydration separation liquid 21 separated by the dehydration facility 2 are mixed and introduced. Biological treatment equipment 3, solid-liquid separation equipment 4 into which the biological treatment liquid from the biological treatment equipment 3 is introduced, and advanced treatment into which the solid-liquid separation liquid separated in the solid-liquid separation equipment 4 is introduced The facility 5 and the sludge treatment facility 6 into which the dewatered sludge 22 discharged from the dewatering facility 2 is introduced, and the excess sludge 23 from the solid-liquid separation facility 4 and / or the advanced treatment facility 5 Return the agglomerated sludge 24 to the upstream side of the dewatering equipment 2 And a return line for sending.

The contaminant removal facility 1 is a facility for removing contaminants from the sludge (waste water) 20, and includes a screen and the like. In the present reference example , the contaminant removal equipment 1 may not be provided. In this case, the entire amount of the sludge (waste water) 20 is caused to flow into the dehydration equipment 2.
The dewatering facility 2 is a facility for dewatering the sludge 20 to a predetermined moisture content, and examples thereof include a filter cloth type dewatering device such as a centrifugal separator, a belt press, and a screw press. In the dehydration equipment 2, it is preferable to dehydrate after adding a dehydrating aid such as an inorganic flocculant or a polymer flocculant.
Further, it is preferable to provide a crushing means on the inlet side of the dewatering facility 2, whereby large-sized contaminants in the sludge (waste water) can be reduced in size, so that problems such as clogging of the dewatering facility 2 are caused. Can be prevented.

The biological treatment facility 3 is a facility for decomposing organic substances in the treatment liquid by the action of microbial decomposition, and one or more of biological denitrification treatment equipment, biofilm treatment equipment, aeration treatment equipment, anaerobic fermentation equipment, etc. They can be used in combination.
The solid-liquid separation equipment 4 is an apparatus for separating a biological treatment liquid into a solid-liquid separation liquid and a solid-liquid separation sludge 23, and is a gravity sedimentation method, a centrifugal separation method, a membrane separation method, a coagulation separation method, and a flotation separation method. Etc. can be used.
Examples of the advanced processing device 5 include a coagulation separation device, an activated carbon adsorption tower, and the like. The processing solution after the solid-liquid separation may be installed as necessary when the treatment liquid does not reach the discharge level.
The sludge treatment facility 6 is a facility that performs drying, incineration, composting, and the like of the dewatered sludge 22 discharged from the dewatering facility 2. The dewatered sludge 22 can also be used as a fuel for an incinerator or the like when dehydrated to a predetermined moisture content or less.

The operation of the system having the above configuration will be described together with a processing method.
First, at least a part of the sludge (waste water) 20 received in the system is branched, and the branched sludge 20 is introduced into the contaminant removal equipment 1 to remove contaminants in the waste water. Further, the other branched sludge (waste water) 20 is introduced into the dehydration facility 2, and after adding a dehydration aid as necessary, the dewatering facility 2 dehydrates until a predetermined moisture content is obtained. At this time, the amount of sludge 20 to the branch may be determined in accordance with the properties of the sludge 20. For example, a sludge mainly composed of septic tank sludge, branch quantity case when human waste content is high to increase the amount of waste water to be introduced into the contaminant removal system 1, mainly the septic tank sludge Reduce. Further, the contaminant separation liquid from the contaminant removal facility 1 and the dehydration separation liquid from the dehydration facility 2 are mixed, introduced into the biological treatment facility 3 and biologically treated, and mainly BOD, TN (total nitrogen ) And the like, and the treatment liquid after the biological treatment is subjected to solid-liquid separation with the solid-liquid separation equipment 4, and then the solid-liquid separation liquid is subjected to advanced treatment such as coagulation sedimentation treatment and activated sludge treatment with the advanced treatment equipment 5. After removing TP (phosphorus), COD, and chromaticity components, the treated water is discharged.
Further, the solid-liquid separation equipment 4 excess sludge 23 obtained by separating by said advanced treatment facility 5 aggregation sludge 24 obtained by coagulating sedimentation processing at is to return to the dewatering equipment 2, sludge (Waste water) 20 and dehydrated.
Further, the dewatered sludge 22 discharged from the dewatering facility 2 is subjected to processing such as fueling, incineration, drying, composting, and landfilling in the sludge treatment facility 6.

According to this reference example 1, since at least a part or the whole amount of the accepted sludge (waste water) 20 is dehydrated without removing the contaminants, the sludge (waste water) is left in the dehydration facility with the contaminants remaining. The introduction improves the dehydration property by utilizing the fiber content contained in the contaminants, thereby enabling dehydration with high efficiency, low water content, and high solids recovery rate. As a result, it is possible to turn sludge into fuel and put it into an incineration facility, so that the recycling of waste can be achieved.
In addition, due to the effect of improving the dehydration property, the amount of dehydration aid used can be reduced, and the cost can be reduced.
Furthermore, since the sludge removability on the dewatering surface in the dewatering facility is improved, troubles due to clogging can be prevented and the amount of washing water can be greatly reduced. In particular, when a filter cloth type dewatering facility is employed, this effect becomes remarkable. And the reduction | decrease in the amount of washing water can attain downsizing of the biological treatment equipment 3, the solid-liquid separation equipment 4, and the advanced treatment equipment 5 in the subsequent stage.
Furthermore, the contaminant removal equipment 1 and the dehydration equipment 2 can be unified, and the number of equipment can be reduced.
In addition, when dehydrating surplus sludge and coagulated sludge containing a small amount of fiber, it is introduced into the dewatering equipment 2 in the pretreatment process and dehydrated together with sludge (waste water) 20, so that the fiber content in the contaminants can be reduced. It can be utilized and the sludge dewaterability can be improved with respect to the entire sludge in the system.
[ Reference Example 2]

FIG. 2 shows a sludge treatment system according to Reference Example 2. Hereinafter, in Reference Example 2 and Example 5, detailed description of the configuration substantially similar to that of Reference Example 1 is omitted.
In the sludge treatment system according to Reference Example 2, sludge containing septic tank sludge may be treated, and other sludge such as human waste may be mixed.
In the system according to the second reference example , in addition to the configuration of the first reference example , the dewatering aid supply means 7 for supplying the dewatering aid to the sludge 20 and the sludge (waste water) supplied with the dehydration aid are concentrated sludge. 25 and a sludge concentrating facility 8 for separating into a concentrated separation liquid 26. Further, the concentrated sludge 25 is introduced into the dehydration facility 2, and the concentrated separation liquid 26 is introduced into the biological treatment facility 3 together with the dehydrated separation liquid 21 from the dehydration facility 2.
The dehydration aid supply means 7 is means for supplying dewatering aids such as inorganic flocculants and polymer flocculants to the sludge (waste water) 20.
A screen or the like is used as the sludge concentration facility 8.
According to this reference example , since the amount of water flowing into the dewatering equipment 2 can be reduced by providing the sludge concentration equipment 8, the dewatering equipment 2 can be made compact and low power, and the amount of dewatering aid used can be reduced. Reduction can be achieved.
[ Reference Example 3]

FIG. 3 shows a sludge treatment system according to the third reference example . The sludge treatment system according to the reference example 3, the processing target a sludge containing septic tank sludge, other sludge human waste etc. may be mixed.
In the system according to the present reference example 3, in addition to the configuration of the reference example 2, a fibrous substance supply means 9 for externally adding a fibrous substance to the concentrated sludge 25 separated by the sludge concentration facility 8 is provided. It becomes the composition. Examples of the fibrous substance include waste paper and plastic crushed material. By mixing the concentrated sludge 25 and the fibrous material and dehydrating them with the dehydrating equipment 2, it is possible to further improve the dehydrating property due to the fiber content, such as expensive inorganic flocculants and polymer flocculants, etc. The amount of dehydration aid used can be reduced, and the cost can be reduced.
[Example 1 ]

It shows a sludge treatment system according to the first embodiment in FIG. In the sludge treatment system according to the first embodiment, human waste-based wastewater 20a (hereinafter referred to as human waste) mainly including human waste and septic tank sludge wastewater 20b (hereinafter referred to as septic tank sludge) mainly including septic tank sludge are treated. set to target.
In the system according to the first embodiment, in the configuration of the first reference example , the urine 20a is introduced into the contaminant removal equipment 1, and the septic tank sludge 20b is introduced into the dehydration equipment 2, depending on the properties. The installation position is different. Moreover, it is good also as a structure which provides the line 27 which bypasses these between the supply line of the human waste 20a, and the supply line of the septic tank sludge 20b, and provides the valve | bulb 28 on this bypass line 27. In such a configuration, when a trouble occurs in either the contaminant removal equipment 1 or the dehydration equipment 2 and it must be stopped, the valve 28 is controlled to be opened and closed, and waste water is discharged to the operating equipment side. Let it flow. Further, when the septic tank sludge 20b is waste water containing a large amount of impurities such as human waste, the valve 28 is controlled so that the waste water flows into the contaminant removal equipment 1 side to prevent clogging of the pump. good.

In this way, only the septic tank sludge, which contains a large amount of solid pollutants compared to human waste and has severe property fluctuations, is solid-liquid separated in the dehydration facility 2 so that the inflow addition to the biological treatment facility 3 can be efficiently performed. Reduction and instability can be achieved.
Further, impurities in human waste are coarse and contain substances that cause clogging of piping such as vinyl. Therefore, stable sludge dewatering can be achieved by using only the impurities in the septic tank sludge having a relatively fine particle size and homogeneity.
In the present embodiment, the contaminant removal system 1, for example a coarse screen with a higher mesh opening 4 mm, mixed with septic tank sludge 2 0b after the contaminant removal, dehydration in dehydration facilities 2 You may make it do.

Furthermore, FIG. 5 shows a specific configuration of the first embodiment. As shown in the figure, the human waste 20a stored in the human waste receiving tank 10 is fed to the foreign matter removal equipment 1 by the pressure feed pump 11, and the foreign matter 29a in the waste water is removed here. The contaminants 29a are fed to a sludge storage tank 12 described later. The separation liquid 29b from which the impurities 29a have been removed is temporarily stored in the separation liquid storage tank 12.
On the other hand, the septic tank sludge 20b stored in the septic tank sludge receiving tank 13 is fed to the sludge storage tank 15 by the pressure feed pump 14, where the contaminants 29a, the surplus sludge 23 after biological treatment in the subsequent stage, and the flocculated sludge 24 are obtained. And the like and then sent to the crusher 17 by a pressure pump 16. These sludges are crushed by the crusher 16 and then added with a dehydration aid supply means 18 and then introduced into the dehydration facility 2 where they are dehydrated to a predetermined water content. The dehydrated separation liquid 21 generated in the dehydration facility 2 is temporarily stored in the separation liquid storage tank 19. Further, the dewatered and separated sludge 22 from the dewatering equipment 2 is introduced into the sludge treatment equipment 6 and subjected to processing such as fueling, incineration, drying and composting.

  The separation liquid stored in the separation liquid storage tank 12 and the separation liquid storage tank 19 is mixed and sent to the biological treatment facility 3, and after biological treatment, the solid-liquid separation liquid 4 and the surplus Separated into sludge 23. The solid-liquid separation liquid is discharged after being subjected to coagulation sedimentation treatment, activated carbon adsorption treatment and the like in the advanced treatment equipment 5. Further, the excess sludge 23 and the aggregated sludge 24 from the advanced treatment equipment 5 are returned to the sludge storage tank 12.

Further, in the system according to the present embodiment, odor gases 32, 33, and 34 are generated from each facility such as the human waste receiving tank 10, the septic tank receiving tank 13, the sludge storage tank 15, and the biological treatment facility 3. These odorous gases are collected in a deodorizing facility including an acid cleaning tower 30 and an alkali cleaning tower 31. The acid cleaning tower 30 is an apparatus for neutralizing and removing odor components such as ammonia and trimethylamine by supplying an acidic agent such as sulfuric acid (H ₂ SO ₄ ) and hydrochloric acid (HCl). The alkali cleaning tower 31 is a device that neutralizes and removes odorous components such as hydrogen sulfide and methylcaptan by supplying sodium hydroxide (NaOH) and sodium hypochlorite (NaClO).
The acid cleaning waste liquid 35 from the acid cleaning tower 30 and the alkali cleaning waste liquid 36 from the alkali cleaning tower are separately collected, and the alkali cleaning waste liquid 36 is supplied to the septic tank receiving tank 36. Thus, the fats and oils derived from living waste water contained in the septic tank sludge 20b is dispersed by the saponification reaction, it is possible to prevent clogging of the pump clogging or pipe. The acid cleaning waste liquid 35 is supplied to the upstream side of the dehydration facility 2, for example, the sludge storage tank 12. This is because the cohesiveness is improved by shifting the pH of the sludge to be dehydrated to the acidic side, so that the dehydrating property can be improved and the supply amount of the dehydrating aid can be greatly reduced.

  Since the present invention is a system that has high dewatering efficiency and can prevent impurities from being mixed, it can be effectively used for both dehydration sludge as fuel and compost.

It is a whole block diagram of the sludge processing system which concerns on the reference example 1 of this invention. It is a whole block diagram of the sludge processing system which concerns on the reference example 2 of this invention. It is a whole block diagram of the sludge processing system which concerns on the reference example 3 of this invention. 1 is an overall block diagram of a sludge treatment system according to Embodiment 1 of the present invention. FIG. 5 is an overall block diagram illustrating a specific configuration of the first embodiment illustrated in FIG. 4 . It is a whole block diagram of the conventional organic wastewater treatment system.

DESCRIPTION OF SYMBOLS 1 Contaminant removal equipment 2 Dehydration equipment 3 Biological treatment equipment 4 Solid-liquid separation equipment 5 Advanced treatment equipment 6 Sludge treatment equipment 7 Dehydration aid supply means 8 Sludge concentration equipment 9 Fibrous material supply means 10 Human urine receiving tank 13 Septic tank receiving tank 15 Sludge storage tank 17 Crusher 18 Dehydration aid supply means 20 Sludge (organic wastewater)
30 Acid cleaning tower 31 Alkaline cleaning tower 35 Acid cleaning waste liquid 36 Alkaline cleaning waste liquid

Claims (2)

After pretreatment of septic tank sludge wastewater containing a large amount of solid pollutants and human wastewater containing vinyl that causes clogging of piping, the septic tank sludge wastewater and human wastewater are biologically treated, and In an organic wastewater treatment method for deodorizing odor gas,
A first pretreatment step of separating the wastewater wastewater into a contaminant containing a vinyl and a contaminant separation liquid on a coarse screen;
And a second pretreatment step of dehydrating the septic tank sludge wastewater with a dehydration facility to obtain a dehydrated sludge and a dehydrated separation solution, and the contaminant separation liquid obtained in the first and second pretreatment steps. And the biological treatment by mixing the dehydrated separation liquid and
In the second pretreatment step, the septic tank sludge wastewater is mixed with vinyl-containing contaminants, surplus sludge after biological treatment in the latter stage and agglomeration treatment sludge, crushed by a crusher, and then supplied with a dehydration aid. Is a pretreatment step in which a dehydration aid is added by means, introduced into a dehydration facility, and dehydrated to a predetermined moisture content ,
On the other hand, the deodorizing treatment comprises a combination of an acid cleaning section and an alkali cleaning section, and the acid cleaning waste liquid from the acid cleaning section and the alkali cleaning waste liquid from the alkali cleaning section are separately collected, and the second Introduce into each target part of the pretreatment of
The target site where the alkaline cleaning waste liquid is introduced is a site where the alkaline cleaning waste liquid causes a saponification reaction of the oil and fat components derived from domestic waste water contained in the septic tank sludge waste water, and the acid cleaning waste liquid is introduced. The organic wastewater treatment method characterized in that the target site is a site that shifts the pH of sludge wastewater to be dehydrated to the acidic side by the acid washing waste liquid to improve cohesion . Organic with septic tank sludge receiving tank containing a large amount of solid pollutants, receiving urine wastewater containing vinyl causing clogging of piping, receiving urine receiving tank, and deodorizing equipment for deodorizing odor gas in the system In the wastewater treatment system,
A first pretreatment unit for separating human waste water from the human waste receiving tank into a foreign matter containing a vinyl and a foreign matter separation liquid using a coarse screen;
In the septic tank sludge wastewater from the septic tank sludge receiving tank, the waste containing the vinyl, the surplus sludge after the biological treatment in the latter stage and the coagulation treated sludge are mixed and crushed with a crusher, and then dehydrated auxiliary agent supply means A second pretreatment unit to which a dehydration aid is added and introduced into a dehydration facility, and dehydrated to a predetermined moisture content to obtain a dewatered sludge and a dehydrated separation liquid;
The biological treatment unit that mixes the contaminant separation liquid obtained in the first and second processing units and the dehydration separation liquid ,
On the other hand, the deodorization equipment comprises a combination of an acid cleaning section and an alkali cleaning section, and the acid cleaning waste liquid from the acid cleaning section and the alkali cleaning waste liquid from the alkali cleaning section are separately collected, respectively. Introduce into the target part of pretreatment,
The target site where the alkaline cleaning waste liquid is introduced is a site where the alkaline cleaning waste liquid causes a saponification reaction of the oil and fat components derived from domestic waste water contained in the septic tank sludge waste water, and the acid cleaning waste liquid is introduced. The organic wastewater treatment system characterized in that the target site is a site that shifts the pH of sludge wastewater to be dehydrated to the acidic side by the acid washing waste liquid to improve cohesion .

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