WO2019244263A1

WO2019244263A1 - Wastewater treatment system

Info

Publication number: WO2019244263A1
Application number: PCT/JP2018/023372
Authority: WO
Inventors: 誠 ▲高▼谷
Original assignee: 株式会社日本環境科学研究所
Priority date: 2018-06-19
Filing date: 2018-06-19
Publication date: 2019-12-26

Abstract

A wastewater treatment system equipped with a raw water tank for biologically treating wastewater and a flow rate control tank, wherein a hydrolase for an organic substance is contained in the raw water tank, a carrier having Bacillus subtilis BN1001 (the accession number of the deposit given by the International Depository Authority: NITE BP-02608) and Bacillus subtilis var. natto both carried thereon is contained in the flow rate control tank, and the aeration rate in the flow rate control tank is 500 L/min. or more.

Description

Wastewater treatment system

The present invention relates to a wastewater treatment system.

Food production effluent, which is rich in organic pollutants, is a microbial population of dozens of types of activated sludge, which is mainly composed of aerobic bacteria, protozoa, and micro metazoans, which was developed in the UK more than 100 years ago. Biodegradation is often carried out by an activated sludge method utilizing the metabolism of water (Non-Patent Document 1).

In recent years, due to the diversification of food culture and the production of various varieties in small quantities, high-concentration organic pollutants, which are difficult to biodegrade with the activated sludge method alone, are increasingly contained in food production wastewater. Above all, high-concentration fats and oils are difficult to decompose structurally for activated sludge, and cause metabolic deceleration and inactivation.Therefore, when treating with the activated sludge method, take some measures to reduce the inflow load before the treatment. There is a need. One of the countermeasures is the cohesive pressure flotation method (pressure flotation device).

The pressure flotation device is a physicochemical treatment method with a history of more than 50 years, and uses a chemical reaction between organic pollutants in wastewater and added chemicals to remove organic pollutants in wastewater containing oils and fats at a certain rate. It is an excellent high load reduction treatment method that separates and removes. In general, high-concentration oil / fat-containing food production wastewater treatment facilities often use a pressurized flotation device as a pretreatment for the activated sludge method.In the case of public sewer discharge with relatively strict discharge regulation values, a single pressurized flotation device is introduced. There are also examples.

Due to the effects of changes in the economic and social environment since the 1990s, issues related to management, cost, and environment have come to the fore in the pressurized flotation equipment installation treatment facility. The flotation separated sludge generated from the pressurized flotation device becomes 100% surplus sludge, which also increases the total amount of waste generated (Non-Patent Document 2). In order to solve these problems, there is a demand for the construction of a new purification system that has the same processing capacity as the pressure flotation device and that solves the above-mentioned problems in the pressure flotation device.

Therefore, an object of the present invention is to solve the problems of a pressurized flotation device for high-concentration oil-and-fat-containing food production wastewater and to provide a new wastewater treatment system having the same processing capacity as a pressurized flotation device.

That is, the present invention is as follows.
[1] A wastewater treatment system including a raw water tank for biologically treating wastewater and a flow rate adjusting tank,
The raw water tank contains an organic hydrolyzing enzyme,
A carrier carrying Bacillus subtilis (Bacillus subtilis) BN1001 (International accession number NITE BP-02608) and Bacillus subtilis var.
A wastewater treatment system wherein the flow rate adjusting tank has an aeration air volume of 500 L / min or more.

[2] The wastewater treatment system according to [1], wherein the carrier is a carrier for a fixed bed system.

[3] The wastewater treatment system according to [1] or [2], wherein the carrier is a carrier for a fluidized bed system.

[4] The wastewater treatment system according to the above [1] or [2], wherein the organic matter hydrolyzing enzyme includes a lipolytic enzyme lipase.

[5] The wastewater treatment system according to [1] or [2], wherein the wastewater is high-concentration oil-and-fat-containing wastewater.

を It is possible to provide a new wastewater treatment system that solves the problem of the pressurized flotation device for the high-concentration oil-and-fat-containing food production wastewater and has the same processing capacity as the pressurized flotation device.

It is a flow figure showing the outline of the waste water treatment system of the food factory which processes fish meat. It is a flow figure showing the outline of the waste water treatment system of the food factory which manufactures side dishes. It is a flowchart which shows the outline | summary of the wastewater treatment system of the food factory which manufactures a seasoning. It is a flow figure showing the outline of the waste water treatment system of the food factory which manufactures cooking noodles. It is a flow figure showing the outline of the waste water treatment system of the food factory which manufactures noodles. It is a flow figure showing the outline of the waste water treatment system of the food factory which manufactures side dishes. It is a flow figure showing the outline of the waste water treatment system of the food factory which manufactures marine products. It is a flow figure showing the outline of the waste water treatment system of the food factory which manufactures side dishes.

Hereinafter, preferred examples of the present invention will be described, but the present invention is not limited to these examples. Additions, omissions, substitutions, and other modifications of the configuration can be made without departing from the spirit of the present invention.

[Wastewater treatment system]
The wastewater treatment system according to the present embodiment includes a raw water tank for biologically treating wastewater and a flow rate adjustment tank, wherein the raw water tank contains an organic hydrolyzing enzyme, and Bacillus subtilis ( Bacillus subtilis) BN1001 (International Deposit No. NITE BP-02608) and a carrier carrying Bacillus subtilis var. Natto, and the flow rate adjusting tank has an aeration volume of 500 L / min or more. Hereinafter, a mixture of Bacillus subtilis (Bacillus subtilis) BN1001 (Accession No. NITE BP-02608 of the international deposit) and Bacillus subtilis var. Natto may be referred to as microorganism A.

Wastewater may be any wastewater, but is preferably oil-and-fat-containing wastewater, and more preferably high-concentration oil-and-fat-containing wastewater. When the wastewater contains fats and oils, the concentration of fats and oils in the wastewaters is preferably 50 mg / L to 500 mg / L, more preferably 200 mg / L to 500 mg / L, and more preferably 300 mg / L to 500 mg / L. Is more preferable.

排水 In the wastewater treatment system of the present embodiment, if the concentration of fats and oils in the wastewater is up to 500 mg / L, the operation of the pressure flotation device becomes unnecessary. When the concentration of fats and oils in the wastewater exceeds 500 mg / L, the operation of the pressure flotation device can be reduced when the pressure flotation device is used in combination.

(Raw water tank)
Raw water tanks not only contain wastewater, but also treat wastewater biologically. Specifically, the raw water tank contains an organic hydrolase. Since the raw water tank contains an organic hydrolyzing enzyme, high-molecular-weight organic contaminants such as oils and fats in wastewater can be reduced to medium and low molecular weight.

As the organic hydrolase, any enzyme capable of hydrolyzing organic substances can be used without any particular limitation, but it is preferable that lipase, lipase, amylolytic amylase, or protease is included. It is more preferable that the lipase is contained.

"The raw water tank contains an organic hydrolase" means that after adding the microorganism A to the raw water tank, the organic hydrolase may be secreted from the microorganism A, or the organic hydrolase may be added to the raw water tank. You may add directly. However, from the viewpoint of reducing the labor and cost of adding the organic hydrolase to the raw water tank, it is preferable that the microorganism A is secreted from the microorganism A after the microorganism A is added to the raw water tank.

Ｂ The BN1001 bacteria and Bacillus natto constituting the microorganism A are commercially available. BN1001 was deposited on January 11, 2018 with the National Institute of Technology and Evaluation, Patent Microorganisms Depositary Center (2-5-8 Kazusa-Kamasa, Kisarazu-shi, Chiba, Japan) under the international deposit number NITEBP-02608. Have been. As Bacillus natto, Bacillus subtilis var. Any bacterium classified as natto can be used without particular limitation.

When the organic matter hydrolase is secreted from the microorganism A after adding the microorganism A to the raw water tank, the content of the microorganism A in the raw water tank is not particularly limited as long as it is contained to the extent that the effects of the present invention are exhibited. Is preferably contained in an amount of 3 mass ppm to 100 mass ppm, more preferably 5 mass ppm to 50 mass ppm, and more preferably 5 mass ppm to 20 mass ppm based on the total amount of the substances contained in the raw water tank. Is more preferable.

直接 When the organic hydrolase is directly added to the raw water tank, it is preferable to add the same amount of the organic hydrolase secreted by the microorganism A having the content described above.

(Flow control tank)
The flow control tank not only regulates the amount of wastewater but also biologically treats the wastewater. Specifically, a carrier carrying the microorganism A is contained in the flow rate adjusting tank. By including the carrier carrying the microorganism A in the flow rate adjusting tank, the organic pollutants of low and medium molecular weight in the raw water tank can be further biodegraded.

(4) Handling of the microorganism A is improved by supporting the microorganism A on the carrier in the flow control tank. That is, when the microorganisms A are not carried on the carrier in the flow rate adjusting tank, the microorganisms A may be washed away with the wastewater and may be lost. It becomes easy to fix in the tank.

"Including the carrier carrying microorganisms A in the flow rate regulating tank" means that the microorganisms A added to the raw water tank may be moved to the flow regulating tank and carried on the carrier, or may be contained in the flow regulating vessel. The microorganism A directly added may be carried on the carrier, or the carrier carrying the microorganism A may be added to the flow control tank. However, from the viewpoint of reducing the labor and cost of adding the microorganism A, it is preferable that the microorganism A added to the raw water tank be moved to the flow rate adjusting tank and carried on the carrier.

The carrier may be for a fixed bed system, for a fluidized bed system, or for other systems. The fixed bed method is a wastewater treatment method in which microorganisms A are supported on a carrier fixed in a flow rate adjusting tank, and aeration is performed from below. The fixed bed system is excellent in the adsorption of SS (suspended matter), not only easily obtains high-quality treated water, but also has less wear and damage of the carrier during operation and has excellent durability.

The fluidized bed system is a wastewater treatment system in which a carrier carrying microorganisms A is fluidized by a stirring force such as aeration in a flow control tank. With the fluidized carrier, a large specific surface area can be obtained, and the efficiency of contact with the wastewater can be increased.

The carrier for the fixed bed system is not particularly limited as long as the carrier can be fixed in the flow rate adjusting tank, and a carrier such as a bag, a capsule, a ball, or the like enclosing a powder carrier; a mesh, a mesh Carriers such as spheres and strings may be used.

担体 The carrier for the fluidized bed system is not particularly limited as long as the carrier can be made to flow in the flow rate adjusting tank, and examples thereof include sponge-like, tubular, chip-like, and gel-like carriers.

(4) The type of wastewater treatment, the shape of the carrier, the amount of the carrier used, and the like can be appropriately selected according to the characteristics of the wastewater treated by the wastewater treatment system.

材質 Examples of the material of the carrier include cellulose, activated carbon, ceramic, polypropylene, a porous carbon composition, pearlite, calcium carbonate and the like.

The content of the BN1001 bacteria and the Bacillus natto in the flow rate control tank is not particularly limited as long as it is contained to such an extent that the effect of the present invention is exerted. , BN1001 is preferably contained in an amount of 10% to 90% by mass, and Bacillus natto is preferably contained in an amount of 10% to 90% by mass. BN1001 is included in an amount of 40% to 60% by mass, and Bacillus natto is included in an amount of 60% to 40% by mass. More preferably.

The carrier may carry other microorganisms as long as it carries microorganism A. Examples of the microorganisms other than the microorganism A include Bacillus subtilis other than the BN1001 bacterium, lactic acid bacteria, and yeast.

曝 The aeration air volume of the flow rate adjusting tank is 500 L / min or more, preferably 1000 L / min or more, and more preferably 1500 L / min or more. When the amount of aeration air in the flow control tank is within the above range, oxygen necessary for the growth of microorganisms in the flow control tank can be supplied. Although the upper limit value of the aeration air volume of the flow rate adjustment tank is not particularly limited, it is realistic that the upper limit is about 2000 L / min or less in view of the performance of the aeration apparatus.

排水 The wastewater treatment system has a remarkably high decomposition efficiency of hardly decomposable components such as fats and oils, starch, and protein in wastewater, so that the quality of treated water is high and the generation of bad smell and sludge is small. Therefore, the present invention can be suitably used not only in food factories and food processing factories, but also in wastewater treatment in factories, research facilities, livestock barns, sewage treatment plants, and the like that discharge wastewater containing organic pollutants.

As a result, the operation of the pressurized flotation device, which is necessary when treating wastewater with a high oil and fat concentration, becomes unnecessary. For this reason, chemicals required for using the pressurized flotation device are not required, and no flotation separated sludge generated by using the pressurized flotation device is generated. As a result, the cost and labor required for wastewater treatment can be significantly reduced.

[Wastewater treatment method]
The wastewater treatment method of the present embodiment includes a step of adding an organic hydrolase to the wastewater and a step of aerating the wastewater to which the organic hydrolase is added in the presence of a carrier carrying the microorganism A. A method for biologically treating wastewater, wherein the amount of aerated air is 500 L / min or more.

Examples of the wastewater, the organic hydrolyzing enzyme, the microorganism A, and the carrier are the same as those described above.

"Adding organic matter hydrolase to wastewater" means that after adding microorganism A to wastewater, organic matter hydrolase may be secreted from microorganism A, or organic matter hydrolase may be directly added to wastewater. Good. However, from the viewpoint of reducing the labor and cost of adding the organic hydrolase to the waste water, it is preferable that the organic hydrolase be secreted from the microorganism A after the microorganism A is added to the waste water.

“In the presence of the carrier carrying the microorganism A” may be in the presence of the carrier carrying the microorganism A added to the wastewater or a microorganism A different from the microorganism A added to the wastewater. May be present in the presence of a carrier on which is carried. However, from the viewpoint of reducing the labor and cost of supporting the microorganism A on the carrier, it is preferable that the carrier be in the presence of the carrier carrying the microorganism A added to the wastewater.

The aeration air volume is preferably at least 1000 L / min, more preferably at least 1500 L / min. When the amount of aerated air is within the above range, oxygen necessary for the growth of the microorganism A can be supplied. Although the upper limit value of the aeration air flow is not particularly limited, it is practically about 2000 L / min or less in view of the performance of the aeration apparatus.

The aeration step may be performed in a grease trap. In this case, it is preferable to add an aeration device to the grease trap to supply oxygen necessary for the growth of the microorganism A. The grease trap is a water storage tank in which the inside of the tank is divided into a plurality of sections, and has a water inlet for introducing drainage and a drainage outlet for discharging wastewater, and traps oil and fat in the wastewater in a trap. And prevent it from flowing directly into sewers.

Normal grease traps do not biologically treat wastewater, but such grease traps can be said to biologically treat wastewater.

(4) By performing the aeration step in a grease trap, the oils and fats accumulated in the grease trap become almost inconspicuous, scum is almost eliminated, and odor is reduced. For this reason, the cleaning operation of the grease strap can be simplified.

According to the wastewater treatment method of the present embodiment, since hardly decomposable components such as fats and oils, starch, and protein in wastewater can be remarkably efficiently decomposed, high treated water quality is obtained, and generation of offensive odor and sludge is small. . For this reason, the wastewater treatment method of the present embodiment is preferably used not only in food factories and food processing factories, but also in wastewater treatment in factories and research facilities that discharge wastewater containing organic pollutants, livestock barns, sewage treatment plants, and the like. Can be.

[Deodorizing method]
The deodorizing method of the present embodiment includes a step of contacting the organic odor hydrolyzing enzyme with the malodor source, and a step of aerating the malodor source contacted with the organic hydrolyzing enzyme in the presence of the carrier carrying the microorganism A. And a method for biologically treating a malodor source, wherein the aeration air volume is 500 L / min or more.

As an odor source, for example, ammonia, methyl mercaptan, hydrogen sulfide, methyl sulfide, methyl disulfide, trimethylamine, acetaldehyde, propionaldehyde, normal butyraldehyde, isobutyraldehyde, normal valeraldehyde, isovaleraldehyde, isobutanol, ethyl acetate, Examples include methyl isobutyl ketone, toluene, styrene, xylene, propionic acid, normal butyric acid, normal valeric acid, and isovaleric acid.

As the organic hydrolase, the microorganism A, and the carrier, those similar to those described above can be exemplified.

The term "contacting the organic odor hydrolyzing enzyme with the malodor source" means that after adding the microorganism A to the malodor source, the organic hydrolyzing enzyme secreted from the microorganism A may be brought into contact with the malodor source, or The hydrolase may be directly contacted. However, from the viewpoint of reducing the labor and cost of contacting the organic hydrolase with the malodor source, it is preferable to add the microorganism A to the malodor source and then contact the organic hydrolase secreted from the microorganism A with the malodor source. .

"In the presence of the carrier carrying the microorganism A" may be in the presence of the carrier carrying the microorganism A added to the malodor source, or may be different from the microorganism A added to the malodor source. It may be in the presence of a carrier carrying the microorganism A. However, from the viewpoint of reducing the labor and cost of supporting the microorganism A on the carrier, it is preferable that the microorganism A be added to the malodor source in the presence of the carrier.

は The deodorizing method of the present embodiment can efficiently reduce malodor generated from wastewater. This is because bacteria in the carrier efficiently decompose the substance causing the malodor or the substance causing the malodor.

Further, according to the deodorizing method of the present embodiment, not limited to the deodorizing of the wastewater treatment system, for example, in a home or business facility, kitchen, kitchen, toilet, bathroom, washing machine storage, garbage collection point, Alternatively, for example, it is possible to efficiently deodorize a place where a bad odor is generated, such as a livestock barn such as a pig farm and a poultry farm.

[Batch wastewater treatment method]
The batch type wastewater treatment method of the present embodiment includes a wastewater introduction step of introducing wastewater into a raw water tank and a flow rate adjustment tank for biologically treating wastewater, an aeration step of aerating the introduced wastewater, and standing after aeration. A method of repeating each step of the drainage introduction step, the aeration step, the standing step and the discharge step, comprising: The water tank contains an organic hydrolyzing enzyme, the flow rate adjustment tank contains a carrier supporting the microorganism A, and the aeration air volume of the flow rate adjustment tank is 500 L / min or more.

Examples of the drainage, raw water tank, flow control tank, organic hydrolase, microorganism A, and carrier are the same as those described above.

"The raw water tank contains an organic hydrolyzing enzyme" means that after adding the microorganism A to the raw water tank, the organic hydrolyzing enzyme may be secreted from the microorganism A, or the organic hydrolyzing enzyme may be directly added to the raw water tank. It may be added. However, from the viewpoint of reducing the labor and cost of adding the organic hydrolase to the raw water tank, it is preferable that the microorganism A is secreted from the microorganism A after the microorganism A is added to the raw water tank.

"The flow rate adjustment tank contains a carrier carrying microorganisms A" means that the microorganisms A added to the raw water tank may move to the flow rate adjustment tank and be supported on the carrier, or may be directly transferred to the flow rate adjustment tank. The added microorganism A may be carried on a carrier, or the carrier carrying the microorganism A may be added to a flow control tank. However, from the viewpoint of reducing the labor and cost of adding the microorganism A, it is preferable that the microorganism A added to the raw water tank be moved to the flow rate adjusting tank and carried on the carrier.

曝 The aeration air volume of the flow rate adjusting tank is preferably 1000 L / min or more, more preferably 1500 L / min or more. When the amount of aeration air in the flow control tank is within the above range, oxygen necessary for the growth of the microorganism A in the flow control tank can be supplied. Although the upper limit value of the aeration air volume of the flow rate adjustment tank is not particularly limited, it is realistic that the upper limit is about 2000 L / min or less in view of the performance of the aeration apparatus.

Batchwise wastewater treatment method is a method of performing wastewater treatment while repeating a cycle of introducing wastewater, aeration, standing (sedimentation), and discharging treated water (supernatant water) in one biological treatment tank. Since the SS (floating substance) often floats on the surface during the standing step, it is preferable to discharge the treated water not from the water surface but from the water (between the sludge interface and the water surface).

In the batch type wastewater treatment method, the wastewater is in an anaerobic state at the time of wastewater introduction or standing, so that the denitrification effect by the denitrifying bacteria can be expected, and the sedimentation of sludge is good because the static time can be extended. Since the biological treatment tank serves as both the aeration tank and the sedimentation tank, there are advantages such as a simple structure of the apparatus. Further, since the aeration time, the standing time, and the like can be easily changed, the wastewater treatment conditions can be easily adjusted according to changes in the amount of wastewater, water temperature, and the like.

According to the batch type wastewater treatment method of the present embodiment, since hardly decomposable components such as fats and oils, starch, and proteins in the wastewater can be remarkably efficiently decomposed, high treated water quality is obtained, and generation of offensive odor and sludge is generated. Also less. For this reason, the batch type wastewater treatment method of the present embodiment is not limited to food factories and food processing factories, but is suitable for wastewater treatment in factories and research facilities that discharge wastewater containing organic pollutants, livestock barns, sewage treatment plants, and the like. Can be used.

排水 The wastewater treatment system described above was applied to the actual wastewater treatment system of a food factory, and the wastewater treatment capacity was examined.

(Application example 1)
The above-described wastewater treatment system was applied to a wastewater treatment system of a food factory that processes fish meat.

FIG. 1 is a flowchart showing an outline of a wastewater treatment system of this application example. In this factory, it had to discharge the waste water per day 800m ^3. The configuration of the wastewater treatment system was as follows. First, wastewater from the factory was introduced into a raw water tank (capacity: 15 m ³ ), and microorganisms (Bacillus subtilis BN1001 bacteria and Bacillus natto) were added. Subsequently, after removing the residue from the wastewater discharged from the raw water tank with a screen, the wastewater was introduced into a flow rate adjustment tank (capacity: 600 m ³ ) into which a flowable sponge carrier was charged. The aeration air volume in the flow rate adjusting tank was 1500 L / min. Subsequently, the wastewater discharged from the flow rate adjusting tank was introduced into a measuring tank (capacity: 0.2 m ³ ), and water was collected to perform a water quality test. Subsequently, the treated water discharged from the measuring tank was discharged to a public sewer. In the present wastewater treatment system, the retention period (time from inflow to discharge) of the wastewater was about 18 hours.

について The pH, biological oxygen demand (BOD), n-hexane extractables (n-Hex), and suspended solids concentration (SS) of the raw wastewater and treated water were measured. BOD is the amount of oxygen necessary for microorganisms to oxidatively decompose organic pollutants in wastewater, and the higher the value, the more severe the contamination. SS is the concentration of the insoluble suspended substance having a particle diameter of 2 mm or less in the waste water. The higher the value, the more turbid. n-Hex is the amount of fats and oils in waste water and the amount of esters that are difficult to volatilize.

PH was measured according to JIS K0102.12.1. The BOD was measured according to JIS K0102.21 and 32.3. n-Hex is described in Appendix 4 of Notification No. 64 of the Environment Agency (“Testing method for wastewater standards specified by the Minister of the Environment based on the provisions of ministerial ordinances that set wastewater standards”): Promulgation date: September 30, 1974 Measured according to the method. SS was measured according to the method described in Appendix 8 of the Notification of the Environment Agency No. 59 (“Environmental Standards for Water Pollution” promulgated on December 28, 1971).

Table 1 (a) shows the measured values of each item and the quality of regulated water discharge. By applying the wastewater treatment system of this application example, it was possible to significantly lower the public sewerage regulation value of the discharge destination compared to before the application. Further, by applying the waste water treatment system of this application example, the on floatation device is stopped, it was possible to stop the generation of the dehydrated cake of monthly average 84m ³ that occurred so far. In addition, the management was simplified, and the cost of chemicals and the cost of disposal of dewatered cake were reduced. In addition, odor complaints from nearby areas due to chronic odors generated from the entire wastewater treatment system have been eliminated.

(Application Example 2)
The above-mentioned wastewater treatment system was applied to a wastewater treatment system of a food factory that manufactures side dishes.

FIG. 2 is a flowchart showing an outline of the wastewater treatment system of this application example. In this factory, it had to discharge the waste water per day 500m ^3. The configuration of the wastewater treatment system was as follows. First, wastewater from the factory was introduced into a raw water tank (capacity: 15 m ³ ), and microorganisms (Bacillus subtilis BN1001 bacteria and Bacillus natto) were added. Subsequently, after removing the residue from the wastewater discharged from the raw water tank with a screen, the wastewater was introduced into a flow rate adjusting tank (capacity: 100 m ³ ) into which a flowable sponge carrier was charged. The aeration air volume of the flow rate adjusting tank was set to 1000 L / min. Subsequently, the drainage discharged from the flow rate adjusting tank was introduced into a fixed contact tank (capacity 200 m ³ × 2 tank) into which a fixed ball carrier was charged. The aeration air volume of the fixed contact tank was 1500 L / min. Subsequently, the wastewater discharged from the fixed contact tank was introduced into a discharge tank (capacity: 12 m ³ ), and water was collected and subjected to a water quality test. Subsequently, the treated water discharged from the discharge tank was discharged to the public sewer. In this wastewater treatment system, the retention period of the wastewater (the time from inflow to discharge) was about 24 hours.

ＰＨ pH, BOD, n-Hex, and SS were measured for raw wastewater and treated water. These indices were measured in the same manner as described above.

測定 Table 1 (b) shows the measured values of each item and the quality of regulated water discharge. By applying the wastewater treatment system of this application example, it was possible to significantly lower the public sewerage regulation value of the discharge destination compared to before the application. In addition, the sludge extraction from the wastewater treatment system is no longer performed, the complicated operation of the pressure flotation device is no longer required, and the odor generated from the entire wastewater treatment system is reduced. The excellent effect of the wastewater treatment system alone was confirmed.

(Application example 3)
The above-described wastewater treatment system was applied to a wastewater treatment system of a food factory that manufactures seasonings.

FIG. 3A is a flowchart showing an outline of a wastewater treatment system of this application example. In this factory, it had to discharge the waste water per day 700m ^3. The configuration of the wastewater treatment system was as follows. First, wastewater from the factory was introduced into a raw water tank (capacity: 5 m ³ ), and microorganisms (Bacillus subtilis BN1001 bacteria and Bacillus natto) were added. Subsequently, after removing the residue from the wastewater discharged from the raw water tank with a screen, the wastewater was introduced into a relay tank (capacity: 100 m ³ ). Subsequently, the drainage discharged from the relay tank was successively introduced into the activation tanks 1 to 3 (flow rate adjustment tanks) in which fixed ball carriers were charged (all of which had a capacity of 100 m ³ ). The aeration air volume in the activation tanks 1 to 3 was 1500 L / min. Subsequently, the wastewater discharged from the activation tank 3 was introduced into two batch tanks (both having a capacity of 500 m ³ ). Subsequently, the wastewater discharged from the two batch tanks was introduced into a discharge tank (capacity: 10 m ³ ), and the treated water discharged from the discharge tank was discharged into a river.

By applying the wastewater treatment system of this application example, compared to before the application, the water quality could be stabilized, the generation of excess sludge and dewatered cake was reduced, and the daily management was simplified. From this point, the excellent effect of the wastewater treatment system of this application example alone was confirmed.

(Application example 4)
The above-described wastewater treatment system was applied to a wastewater treatment system of a food factory that manufactures cooked noodles.

FIG. 3B is a flowchart showing an outline of the wastewater treatment system of this application example. In this factory, it had to discharge the waste water per day 600m ^3. The configuration of the wastewater treatment system was as follows. First, a residue was removed from general wastewater from a factory by a screen, and then introduced into a raw water tank (capacity: 10 m ³ ), and microorganisms (Bacillus subtilis BN1001 bacteria and Bacillus natto) were added. On the other hand, the residue was removed from the high-concentration wastewater from the factory by a screen, and then introduced into an oil / fat decomposition tank (raw water tank) (capacity: 20 m ³ ), and microorganisms (Bacillus subtilis BN1001 bacteria and Bacillus natto) were added. Subsequently, the wastewater discharged from the fat / oil decomposition tank was introduced into the raw water tank into which general wastewater was introduced. Subsequently, the wastewater discharged from the raw water tank is used as an active tank 1 (flow rate adjusting tank) into which a flow type sponge carrier is charged and an active tank 2 (flow rate adjusting tank) into which a fixed ball carrier is charged (both have a capacity of 200 m ³ ). Was introduced sequentially. The aeration air volume of the activation tanks 1 and 2 was 1000 L / min. Subsequently, the wastewater discharged from the activation tank 2 was introduced into a discharge tank (capacity: 10 m ³ ), and the treated water discharged from the discharge tank was discharged to sewage.

By applying the wastewater treatment system of this application example, compared with before the application, the water quality could be stabilized, the sludge was not drawn out of the wastewater treatment system, and the odor generated from the entire wastewater treatment system The excellent effect of the wastewater treatment system of this application example alone was also confirmed from the fact that the number of wastewater was reduced and that the daily management was simplified.

(Application example 5)
The above-described wastewater treatment system was applied to a wastewater treatment system of a food factory that manufactures noodles.

FIG. 3C is a flowchart showing an outline of the wastewater treatment system of this application example. In this factory, it had to discharge the waste water per day 400m ^3. The configuration of the wastewater treatment system was as follows. First, wastewater from a factory was introduced into a raw water tank, and microorganisms (Bacillus subtilis BN1001 bacteria and Bacillus natto) were added. Subsequently, after removing the residue from the wastewater discharged from the raw water tank with a screen, the wastewater was introduced into an activation tank 1 (flow rate adjustment tank) (capacity: 80 m ³ ) into which a fixed ball carrier was charged. Subsequently, the waste water discharged from the active tank 1, a fixed type ball carrier charged with active tank 2-4 (flow regulation tank) (active tank 2 and 3 are both capacity 80 m ^3, the active tank 4 volume 110m ³ ) was introduced sequentially. The aeration air volume in the activation tank 1 was 500 L / min, and the aeration air volume in the activation tanks 2 to 4 was 1000 L / min. Subsequently, the wastewater discharged from the activation tank 4 was introduced into a discharge tank (capacity: 10 m ³ ), and the treated water discharged from the discharge tank was discharged to sewage.

(Application example 6)
The above-mentioned wastewater treatment system was applied to a wastewater treatment system of a food factory that manufactures side dishes.

FIG. 3D is a flowchart showing an outline of the wastewater treatment system of this application example. In this factory, it had to discharge the waste water per day 200m ^3. The configuration of the wastewater treatment system was as follows. First, wastewater from a factory was introduced into a raw water tank (capacity: 10 m ³ ), and microorganisms (Bacillus subtilis BN1001 bacteria and Bacillus natto) were added. After removing the residue from the wastewater discharged from the raw water tank with a screen, the wastewater was introduced into a regulating tank also serving as a fat and oil decomposition tank (capacity 60 m ³ ). Subsequently, the wastewater discharged from the regulating tank and the oil / fat decomposition tank was introduced into the activation tank 1 (flow regulating tank) (capacity: 70 m ³ ) into which the fixed ball carrier was charged. Subsequently, the waste water discharged from the activation tank 1 is sequentially introduced into the activation tanks 2 and 3 (flow rate adjustment tanks) (the capacity of the activation tank 2 is 100 m ³ and the capacity of the activation tank 3 is 50 m ³ ) into which the fixed ball carrier is charged. did. The aeration air volume of the activation tank 1 was 1000 L / min, and the aeration air volume of the activation tanks 2 and 3 was 1500 L / min, respectively. Subsequently, the wastewater discharged from the activation tank 3 was introduced into a discharge tank (capacity: 20 m ³ ), and the treated water discharged from the discharge tank was discharged to sewage.

(Application Example 8)
The above-described wastewater treatment system was applied to a wastewater treatment system of a food factory that manufactures marine products.

FIG. 3E is a flowchart showing an outline of the wastewater treatment system of this application example. In this factory, it had to discharge the waste water per day 40m ^3. The configuration of the wastewater treatment system was as follows. First, wastewater from the factory was introduced into a raw water tank (capacity: 25 m ³ ), and microorganisms (Bacillus subtilis BN1001 bacteria and Bacillus natto) were added. After removing the residue from the wastewater discharged from the raw water tank with a screen, the wastewater was introduced into a relay tank (capacity: 6 m ³ ). Subsequently, the drainage discharged from the relay tank was introduced into a flow rate adjusting tank and a fat / oil decomposition tank (flow rate adjusting tank) (capacity: 55 m ³ ) into which a fixed ball carrier was charged. The aeration air volume in the flow rate adjusting tank and the oil / fat decomposition tank was 1000 L / min. Subsequently, the wastewater discharged from the flow rate adjusting tank and the oil / fat decomposition tank was introduced into two batch tanks (both having a capacity of 55 m ³ ). Subsequently, the wastewater discharged from the two batch tanks was introduced into a discharge tank (capacity: 2 m ³ ), and the treated water discharged from the discharge tank was discharged into a river.

By applying the wastewater treatment system of this application example, compared to before the application, the water quality could be stabilized, the odor generated from the entire wastewater treatment system was reduced, and the daily management was simplified. From these points, it was confirmed that the wastewater treatment system according to this application example alone had an excellent effect.

(Application Example 9)
The above-mentioned wastewater treatment system was applied to a wastewater treatment system of a food factory that manufactures side dishes.

FIG. 3F is a flowchart showing an outline of the wastewater treatment system of this application example. In this factory, it had to discharge the waste water per day 10m ^3. The configuration of the wastewater treatment system was as follows. First, wastewater from the factory was introduced into a raw water pump tank (capacity: 0.5 m ³ ). After removing the residue from the wastewater discharged from the raw water pump tank with a screen, the wastewater is introduced into a flow rate adjusting tank and an initial oil / fat decomposition tank (raw water tank / flow rate adjusting tank) (capacity: 10 m ³ ) into which a flow-type sponge carrier is charged. , And microorganisms (Bacillus subtilis BN1001 bacteria and Bacillus natto). The aeration air volume of the flow rate adjusting tank and the initial oil / fat decomposition tank was 500 L / min. Subsequently, the wastewater discharged from the flow rate adjusting tank and the initial fat / oil decomposition tank was introduced into a fat / oil decomposition tank (flow rate adjusting tank) (capacity: 13 m ³ ) into which a fixed ball carrier was charged. Subsequently, the wastewater discharged from the oil / fat decomposition tank was introduced into an activation tank (flow rate adjusting tank) (capacity: 19 m ³ ) into which a fixed ball carrier was charged. The aeration air volume in the oil and fat decomposition tank and the activation tank was 1000 L / min. Subsequently, the wastewater discharged from the activation tank was introduced into a discharge tank (capacity: 5 m ³ ), and the treated water discharged from the discharge tank was discharged into a river.

Claims

A wastewater treatment system comprising a raw water tank and a flow control tank for biologically treating wastewater,
The raw water tank contains an organic hydrolyzing enzyme,
A carrier carrying Bacillus subtilis (Bacillus subtilis) BN1001 (International accession number NITE BP-02608) and Bacillus subtilis var.
A wastewater treatment system wherein the flow rate adjusting tank has an aeration air volume of 500 L / min or more.
The wastewater treatment system according to claim 1, wherein the carrier is a fixed-bed carrier.
The wastewater treatment system according to claim 1 or 2, wherein the carrier is a fluidized bed carrier.
The wastewater treatment system according to claim 1 or 2, wherein the organic matter hydrolyzing enzyme comprises a lipolytic enzyme lipase.
The wastewater treatment system according to claim 1 or 2, wherein the wastewater is high-concentration oil-and-fat-containing wastewater.