JP3836682B2 - Wastewater purification system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a system for purifying organic wastewater such as agricultural settlement wastewater.
[0002]
[Prior art]
Japanese Examined Patent Publication No. 5-10999 discloses a purification system of this kind and a simple production apparatus for seed sludge attached to this system. This simple manufacturing apparatus has an outer casing and an inner cylinder, the inner cylinder is filled with pellets containing humic substances, and a part of the organic waste water from the purification system is introduced into the outer casing. It is burned. The guided organic wastewater circulates inside the outer casing as it passes from the bottom to the top of the inner cylinder, contacts the pellets during circulation, and the soil bacteria that help purify the wastewater through the contact Growth and activation of metabolic function are promoted. Organic wastewater containing such bacteria is taken out as seed sludge and returned to the purification system. By exchanging a part of the waste water between the purification system and the simplified manufacturing apparatus in this way, the bacteria group in the purification system can always be maintained in an activated state.
[0003]
[Problems to be solved by the invention]
In the simple seed sludge production apparatus in the known system, since the pellets containing humic substances are in close contact with each other inside the inner cylinder, the contact area between the pellet and the drainage is large even if a large amount of pellets are used. Does not increase so much. In particular, when the operation of the simple manufacturing apparatus is extended for a long period, the pellets become fine particles and are filled in the inner cylinder body at a high density, so that it becomes more difficult for the pellets and the drainage to contact in a wide area. . The inner cylinder in such a state must be taken out of the outer casing, discarded used pellets and filled with new ones, and the pellets are often wasted. In addition, a heavy machine such as a crane must be used to take out the inner cylinder, and a great deal of cost and time are required each time the pellets are replaced.
[0004]
The present invention provides an organic wastewater purification system that enables contact between humic substances and wastewater over a wide area and eliminates the need for exchange of humic substances, thereby solving various problems such as those found in the above-mentioned known technology. It is an issue.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention is directed to a system for purifying organic wastewater by the action of soil bacteria, taking a part of the wastewater from the system and bringing it into contact with humic substances, and then the wastewater. Is a wastewater purification system accompanied by a step of returning a part of the system to the system.
[0006]
In this waste water purification system, the present invention is characterized as follows. The humic substance is fine particles containing an inorganic substance, and the amount of the fine particles is in the form of a mixture with water in the range of 0.05 to 3% by weight , either continuously or intermittently by the supply means The supply means is a mixing tank with a stirrer capable of mixing the fine particles and water, and the fine particles are charged into the mixing tank either continuously or intermittently. A possible hopper and transport means for sending the mixture of fine particles and water to the reservoir, the mixture being 0.5 / 1000-5 of the amount of the wastewater per day to be treated in the reservoir / 1000 is added to the waste water and returned to the system, and the volume of the mixing tank is 0.5-1% of the volume of the water tank.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
The details of the waste water purification system according to the present invention will be described with reference to the accompanying drawings.
[0008]
FIG. 1 is a flowchart showing an example of a wastewater purification system. In this waste water purification system, organic waste water 1 such as agricultural settlement waste water is supplied to the adjustment tank 2 from the left side of the figure, and the waste water 1 further proceeds to the reaction tank 3 and the separation tank 4 and purified in the separation tank 4. The waste water 1 is separated and goes out as treated water 6 and has a system that can return part of the waste water 1 in the separation tank 4 to the adjustment tank 2 and the reaction tank 3 as necessary. This system is accompanied by a step of leading the waste water 12 which is a part of the waste water 1 of the separation tank 4 to the culture tank 7 together with the sludge of the separation tank 4 if necessary. The culture tank 7 is supplied with a first mixed water 31 (see FIG. 2) containing humic substances in the form of fine particles from a humic substance supply device 8 juxtaposed thereto. From the culture tank 7, the drainage 12 becomes the second mixed water 32 containing a large amount of soil bacteria and is returned to the adjustment tank 2 and the reaction tank 3. The second mixed water 32 may contain sludge. The adjustment tank 2 may be referred to as a pretreatment tank, the reaction tank 3 may be referred to as a treatment tank or an aeration tank, and the separation tank 4 may be referred to as a precipitation tank. As these water tanks, those commonly used in the art can be used.
[0009]
FIG. 2 is a cross-sectional view of the culture tank 7 and the supply tank 8 in FIG. The culture tank 7 is supplied with the waste water 12 from the separation tank 4 and the first mixed water 31 from the supply tank 8. The culture tank 7 has a diffuser pipe 14 and a first water supply pipe 16, and mixes the waste water 12 and the first mixed water 31 under aerobic conditions by supplying air from the diffuser pipe 14.
[0010]
The supply device 8 has a water supply device 20, a hopper 22, a stirrer 24 driven by a motor 23, and a second water supply pipe 26 connected to the culture tank 7. A water supply pump 27 is attached to the second water supply pipe 26. Yes. The water supply device 20 is a water supply tank or the like, and from here, water 21 for mixing suitable for mixing with the waste water 12 of the culture tank 7 to grow soil bacteria is supplied continuously or intermittently. An example of the mixing water 21 is the treated water 6 of FIG. Fine particles 30 mainly composed of humic substances and inorganic substances are introduced into the hopper 22, and the fine particles 30 are sent to the supply tank 8 continuously or intermittently via the feeder 25. The water 21 and the fine particles 30 are mixed by the stirrer 24 to become the first mixed water 31 and sent to the culture tank 7 by the pump 27.
[0011]
In the culture tank 7, the first mixed water 31 and the drainage 12 are mixed and agitated under the aerobic condition together with the fine particles 30 by the action of the air diffuser 14 to become the second mixed water 32. In the second mixed water 32, the growth of soil bacteria contained therein and the activation of the metabolic function are promoted under such agitation, and the purification capacity for the waste water 1 in FIG. 1 is improved. The second mixed water 32 is returned to the adjustment tank 2 and / or the reaction tank 3 through the first water supply pipe 16.
[0012]
In such a supply apparatus 8, the fine particles 30 are made of a mixture of humic substances and inorganic substances, and preferably have a particle size of 50 mesh or more. The inorganic substance is preferably a mineral particle, more preferably a mineral particle containing silicate, more preferably a mineral containing a silicate such as pumice, andesite, rhyolite, volcanic glass, zeolite, green tough, diatomaceous earth, clay mineral, etc. Particles are used. In the fine particles 30, the inorganic substance occupies 50 to 90% by weight, and the organic substance mainly composed of the corrosive substance occupies the remaining part. The amount of the fine particles 30 used is preferably in the range of 0.05 to 3% by weight in the first mixed water 31. In addition, the first mixed water 31 may be added to the waste water 12 continuously or intermittently by the pump 27 about 0.5 / 1000 to 5/1000 of the amount of the daily waste water 12 to be treated in the culture tank 7. preferable. Thus, since the usage-amount of the 1st mixing water 31 is very small compared with the quantity of the waste_water | drain 12, the internal volume of the supply tank 8 is 0.5-1 of the internal volume of the culture tank 7, if normal. % Is enough. However, in FIG. 2, the supply tank 8 is shown in the same size as the culture tank 7 in order to clearly show the structure of the supply tank 8. Further, the culture tank 7 does not need to contain a container for filling humic pellets as in the prior art, so a small internal volume is sufficient.
[0013]
FIG. 3 shows the supply pattern of the first mixed water 31 containing fine particles 30 from the supply device 8 to the culture tank 7 and the return of the second mixed water 32 from the culture tank 7 to the adjustment tank 2 and / or the reaction tank 3. It is drawing which illustrates a pattern. In FIG. 3A, the first mixed water 31 is intermittently supplied to the culture tank 7, and the second mixing is performed from the culture tank 7 to the adjustment tank 2 and / or the reaction tank 3 between the supply. Water 32 is returned. The second mixed water 32 may contain sludge. In the example of (a), the supply of the first mixed water 31 and the return of the second mixed water 32 are intermittent, and it is generally suitable for food-related or livestock-related wastewater purification with a high BOD value. In FIG. 3B, the first mixed water 31 is intermittently supplied, while the second mixed water 32 is continuously returned from the culture tank 7. The example of (b) is suitable for purification of domestic wastewater having a relatively low BOD value.
[0014]
FIG. 4 is a partial view of the purification system when the culture tank 7 and the supply tank 8 of FIG. 1 are integrated to form a culture tank 47. The culture tank 47 includes a diffuser pipe 14, a water supply pipe 16, a hopper 22, and a stirrer 24, and drainage 12 is supplied from the separation tank 4. The drainage 12 may contain sludge. Fine particles 30 are supplied from the hopper 22 through the feeder 25. The waste water 12 and the fine particles 30 are mixed under an aerobic condition to become the third mixed water 53 in which the growth of soil bacteria and the activation of the metabolic function are promoted. From the first water pipe 16 to the adjusting tank 2 and the like Will be returned to. A pump 57 is attached to the first water supply pipe 16 so that the third mixed water 53 can be returned intermittently. The culture tank 47 of this embodiment also does not need to contain a container for filling humic pellets as in the prior art.
[0015]
The waste water purification system according to the present invention, which is accompanied by a step of mixing the waste water 12 and the humic substance 30 to promote the growth and activation of soil bacteria, is not limited to the embodiment illustrated in FIG. A mode in which any one of the separation tanks 4 is composed of a plurality of tanks, a mode in which the adjustment tank 2 and the reaction tank 3 are integrated, a water tank for other purposes in addition to the adjustment tank 2, the reaction tank 3, and the separation tank 4 It is possible to implement in the aspect etc. which have.
[0016]
【The invention's effect】
The wastewater purification system according to the present invention is accompanied by a step of bringing a part of the wastewater into contact with the humic substance, and the step includes a relatively small water tank as a culture tank and the humic substance in the water tank. Since it is formed by the supply means and the return means for drainage, providing the process and maintaining the process does not require heavy equipment such as a crane, for example. Absent. In this process, since the humic substance is used in the form of fine particles of 50 mesh or more, it is possible to contact the humic substance and the wastewater over a wide area, and the soil bacteria can rapidly grow and activate the metabolic function. And become possible. Since the humic substance is consumed while circulating through the waste water purification system, it is not necessary to replace the humic substance as in the prior art, and the humic substance is not wasted.
[Brief description of the drawings]
FIG. 1 is a flowchart of a wastewater purification system.
FIG. 2 is a cross-sectional view of a culture tank and a humic substance supply apparatus.
FIG. 3 is a diagram illustrating an operation mode of a culture tank.
FIG. 4 is a cross-sectional view of a culture tank showing an example of an embodiment.
[Explanation of symbols]
1 Drainage 7 Water storage tank (culture tank)
8 Supply means mixing tank (humic substance supply device)
12 Drainage 16 Return means (first water pipe)
22 Supply means (hopper)
24 Stirrer 26 Transport means (second water pipe)
30 Fine particles 31 Mixture (first mixed water)

Claims (6)

A system for purifying organic wastewater by the action of soil bacteria, wherein a part of the wastewater is taken out of the system and brought into contact with humic substances, and then a part of the wastewater is returned to the system. In
The process comprises a water storage tank into which a part of the waste water taken out from the system flows, a supply means for the humic substance to the water storage tank, and a means for returning the waste water from the water storage tank to the system. ,
The humic substance is fine particles containing an inorganic substance, and the amount of the fine particles is in the form of a mixture with water in the range of 0.05 to 3% by weight , either continuously or intermittently by the supply means Supplied in the form of
The supply means includes a mixing tank equipped with a stirrer capable of mixing the fine particles and water, a hopper capable of charging the fine particles continuously or intermittently into the mixing tank, Transportation means for sending a mixture of fine particles and water to the water tank, and the mixture uses 0.5 / 1000 to 5/1000 of the amount of the waste water per day to be treated in the water tank as the waste water. Add and return to the system,
The said waste water purification system characterized by the volume of the said mixing tank being 0.5 to 1% of the volume of the said water storage tank.   The waste water purification system according to claim 1, wherein the water storage tank is a culture tank in the waste water purification system.   The wastewater purification system according to claim 1 or 2, wherein the content of the inorganic substance in the fine particles is 50 to 90% by weight.   The drainage purification system according to any one of claims 1 to 3, wherein the inorganic substance includes a silicate compound.   The drainage purification system according to claim 4, wherein the silicate compound is any one of pumice, andesite, rhyolite, volcanic glass, zeolite, green tough, diatomaceous earth, and clay mineral.   The waste water purification system according to any one of claims 1 to 5, wherein the fine particles are 50 mesh or more.

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