KR20010036777A - Method and system for treating livestock wastewater using microorganisms derived from soil - Google Patents

Abstract

PURPOSE: Provided is a method and system for treating livestock wastewater using microorganisms derived from soil, in which slurry phase of livestock wastewater is effectively composted by microorganisms and treated water is recycled to the first aeration tank as well as used for wash-water of a pigsty. CONSTITUTION: The system consists of a retention tank(2) for storing livestock wastewater; four aeration tanks (4,5,6,7) for decomposing organics; a chemical conditioning tank(14); a settling tank(14) for separation of liquid and solid; a storage tank (18) for storing treated wastewater; a thickening tank(22) for dehydrating settled sludge in a settling tank; a window(23) for fermenting thickened sludge. In the system, discharged water from a storage tank(8) is returned to the first aeration tank(4) for activating microorganisms and used for wash water of a pigsty. For eliminating odorous gases arising from indole, scatole, ammonia, mercaptan, etc., microorganisms derived from soil such as Streptomyces sp, Bacillus sp, and Pseudomonas sp are inoculated into wastewater. This system is closed-system, so there is no waste discharges to territory outsides.

Description

Circulation Treatment Method and System of Livestock Wastewater Using Soil Microorganisms {.}

An object of the present invention is to efficiently treat and treat swine wastewater containing high concentrations of organic matter and nutrients using soil microorganisms and metabolites thereof to circulate to maintain biological activity in the system or to use such as pig wash water. The aim is to achieve a method and system that can reduce livestock emissions and treat livestock wastewater with no odors and no discharges.

As the livestock industry is fully commercialized, commercialized and grouped, the total production of livestock wastewater is increasing rapidly. It is concentrated in certain areas, causing serious environmental pollution, and because it contains high concentrations of organic substances and nutrients such as nitrogen and phosphorus. There is difficulty. The livestock wastewater treatment methods used in domestic hog farms have been used in many ways, including composting, sawdust, septic tank, activated sludge, anaerobic digestion and oxidizing method, but most of them have low treatment efficiency and nutrient removal. It was difficult or expensive facility cost and driving cost was difficult to apply in reality. In particular, livestock wastewater has high nitrogen and phosphorus content, which causes eutrophication when discharged to rivers or lakes, and causes environmental pollution. It is a method to remove bardenpho, A / O, and Atoo. (A ² / O), UCT, VIP, intermittent aeration method, etc. have been developed, but most of them have to supply organic material separately from the outside, so the economic burden is large, or even if a high concentration of nitrogen is introduced, it cannot be properly processed. .

Therefore, the present invention is to select a microorganism capable of effectively removing high concentrations of organic substances, nitrogen and phosphorus in the treatment of livestock wastewater and to utilize the metabolites thereof to continue treatment without inoculation or incubation of the spawn; A method and system for odorless and discharged livestock wastewater that is free of pollutants by attaining a system that can secure quality treated water and reused it as pig wash water and using sludge as organic compost. To achieve.

1 is an overall flow chart in accordance with the present invention

2 is a plan view of a system according to the invention.

<Explanation of symbols for main parts of drawing>

1: Donsa 2: Reservoir

3: raw water pump 4: first aeration tank

5: 2nd aeration tank 6: 3rd aeration tank

7: fourth aeration tank 8: broa

9: diffuser 10, 11, 12, 19, 20: submersible pump

13: chemical tank 14: reactor

15: metering pump 16: stirrer

17: sedimentation tank 18: treated water tank

21: sludge pump 22: concentration tank

23: compost

An object of the present invention is to separate the sewage tank from a storage tank for storing wastewater generated in a hog facility without division of manure and urine, an aeration tank for decomposing organic matter by activating microorganisms, a reaction tank for improving sludge, a sedimentation tank separating gravity from sludge and water, and a sedimentation tank. It consists of a treatment tank for storing the supernatant water, a concentration tank for condensing the sludge separated from the sedimentation tank, and a compost for fermenting the sludge concentrated from the thickening tank. The treated water in the treatment tank is circulated to the aeration tank for microbial activity, The compost produced in the compost is achieved by the circulation treatment method of livestock wastewater, characterized in that there is no pollutant discharged from the pig farm using organic fertilizer.

Microorganisms used in the present system to achieve another object of the present invention are soil microorganisms, such as Streptomyces as actinomycetes and Bacillus, Pseudomonas as bacteria, etc. Its ability is excellent and produces metabolites that affect the growth of microorganisms in other groups. This metabolite helps to activate and stabilize aerobic microorganisms, which prevents microorganisms from killing under adverse conditions and prevents contamination of other microorganisms. It is not necessary. In addition, these bacteria and metabolites adsorptively decompose odor-causing substances such as lower fatty acids, indole, skadol, ammonia, hydrogen sulfide, and mercurtan, and the odor disappears from the entire system.

Specific methods for achieving the present invention will be described in detail with reference to the drawings. 1 is an overall flow diagram of the system of the present invention and FIG. 2 is a plan view. The wastewater generated in the pig house 1 is stored in the storage tank 2 in the form of a slurry without the classification of manure. Aeration of the broth in the storage tank prevents sediment deposition and also acts as a preliminary aeration tank. The manure stored in the storage tank is introduced into the aeration tank with a volume of 10 to 15 times the daily dose by the pump 3 at a predetermined amount. In general, microorganisms vary in activity, state, and density of microorganisms according to concentrations of organic substances, so the aeration tank is divided into four alterations, the first aeration tank (4), the second aeration tank (5), the third aeration tank (6), and the fourth aeration tank. It is composed of (7), the first aeration tank and the second aeration tank in the lower, the second aeration tank and the third aeration tank in the upper, the third aeration tank and the fourth aeration tank in the lower opening to the difference in the active state and density of the microorganism To me. In particular, the fourth aeration tank has a low concentration of organic substances, and thus microorganisms enter into a durable or spore-forming stage, and the microorganisms in this state are returned to the first aeration tank to secure the microbial population of the first aeration tank. The lower part of the aeration tank is provided with a broa 8 and an acid pipe 9 to maintain the dissolved oxygen concentration in the aeration tank of 0.5 mg / l or more, and the liquid of the third aeration tank using the submersible pump 10 is used for the second and the third. 3 It spreads in the upper part of an aeration tank, and the liquid of a 4th aeration tank is scattered in the upper part of a 1st and 4th aeration tank using the water pump 11. This removes bubbles generated in the aeration tank and dissolves oxygen in the air, and serves to circulate microorganisms in the third and fourth aeration tanks into the second and first aeration tanks. The liquid of the fourth aeration tank is introduced into the reaction tank 14 by a predetermined amount by the submersible pump 12 in a state in which organic substances are almost decomposed, and a coagulant is prepared in the chemical tank 13, and a predetermined amount is used by using the metering pump 15. Flow into the reactor. Stirrer 16 is attached to the reaction tank so that the flocculant is reacted evenly to improve the settling properties of the sludge produced. The liquid staying in the reactor for a certain time flows into the settling tank 17 and is separated into sludge and supernatant by gravity. The supernatant water is collected in the treatment tank 18 and controlled by the submersible pump 19 to adjust the flow rate from 1 to 4 times the inflow water to be returned to the first aeration tank, and another pump 20 can be used as the pig washing water. It was. The return of a portion of the supernatant to the first aeration tank helps the metabolites contained in the aeration tank to be active and stabilized, thus maintaining more than a certain number of microorganisms under any impact load and adverse conditions, eliminating the need for spawn reinoculation. It also controls the concentration of microorganisms (MLSS) to an optimal state and also removes odor-causing substances. When the remaining treated water is used as pigs wash water, it reduces the amount of wastewater generated and suppresses the growth of anaerobic and decaying bacteria inside pigs, reducing the generation of gas, resulting in less odor and thus reducing disease. The sludge separated from the settling tank is introduced into the thickening tank 22 by the pump 21, and the sludge concentrated for a certain time is introduced into the compost 23 to compost. The organic compost produced in this way is rich in fertilizer components such as nitrogen and phosphoric acid, and contains the metabolites, so that the same effect as the treated water when fertilizing the soil. The water quality of the treated water was 3 to 10 ppm or less, COD 50 to 100 ppm, TN 200 to 400 ppm, TP 0.5 to 2 ppm or less, and almost all of the BOD material and phosphorus were removed. Although nitrogen remains, COD is a metabolite produced by microorganisms, which is indispensable in the system to maintain the stabilization and activity of microorganisms, or to remove odor-causing substances, and to prevent decay and pathogenic microorganisms. In addition, the COD material and nitrogen are kept at a constant concentration without accumulating any more even if the treated water is circulated continuously. Therefore, even if the treated water is used as a liquid fertilizer for the cultivation of crops, it acts as a nitrogen source fertilizer and in particular, the metabolites contained affect the microbial ecology of the soil, bringing the effect of soil improvement and helping the growth of crops. .

As a result, the present invention composts slurry livestock wastewater by effectively removing organic matter, nitrogen, and phosphorus using soil microorganisms, and circulating the treated water to pigs wash water and first aeration tank to reduce the amount of wastewater generated and It is an efficient livestock wastewater treatment method that can achieve a good breeding environment.

Example 1

Four tanks of cylindrical reactor (15ℓ) were used as the first, second, third, and fourth aeration tanks to form a system as shown in FIG. 1, and 10 liters of soil microorganisms (actinomycetes, Bacillus, Pseudomonas), which were cultured in-house, were added to each tank. The lower part was aerated using an air pump for 2 days, and 3 liters of BOD 20,000 ppm pig wastewater was put into the first aeration tank over a period of 24 hours by attaching a timer to the pump. At this time, 6 L of this solution was also added to the first aeration tank in the same manner over 24 hours, using the supernatant obtained by precipitating the soil microbial culture solution using a flocculant as a circulating fluid. The discharged liquid was collected separately and coagulated to give a supernatant as a circulating fluid. In this way, the amount of circulating fluid was 1 times (3 liters), 2 times (6 liters), 3 times (9 liters), and 4 times (12 liters) of raw water input (3 liters). Was analyzed three times and the average is shown in Table 1.

Example 2

Livestock wastewater treatment experiment was carried out in the same manner as in Example 1, but the circulation of treated water was fixed at twice the amount of raw water input and the experimental results according to the raw water input were shown in Table 2.

Example 3

In 1 liter of the treated water treated in Example 2, chemicals such as methyl ethyl sulfide, dimethylamine, triethylamine, ammonium chloride, toluene, and tallowbenzene, which are odor generating substances, were artificially added at a concentration of 50 to 800 ppm. The change in concentration with time was measured using gas chromatograph (GC), indo-phenol method and IC method. The removal efficiency after 14 hours was shown in Table 3.

As can be seen from the above, according to the method of the present invention, since the apparatus is simple and the livestock waste water is circulated and reused as pig washing water, the amount of waste water is greatly reduced and there are no pollutants discharged. In particular, the microorganisms used have the advantages of removing odors and inhibiting the growth of anaerobic and decaying bacteria.

Claims (2)

In the treatment of livestock wastewater, the livestock wastewater is treated with soil microorganisms, especially Streptomyces as actinomycetes, Bacillus genus and Pseudomonas as bacteria. By circulating the treated solution using the metabolite produced by the microorganism, the inoculation or cultivation of microorganisms is not necessary, and the bacteria and metabolites are odor-causing lower fatty acids, indole, skadol, and ammonia. Treatment of livestock wastewater characterized by adsorption and decomposition of hydrogen sulfide, merethane and other odors in the entire system, and the use of treated water as pig wash water. Storage tank for storing wastewater generated in pig farms without distinction between manure and urine to achieve claim 1, activating microorganisms to decompose organic substances, especially aeration tank consisting of four tanks, reactor for improving sludge, sludge It consists of a sedimentation tank that separates gravity from water, a treatment tank for storing the supernatant water separated from the sedimentation tank, a concentration tank for condensing sludge separated from the sedimentation tank, and a composting plant for fermenting and composting the sludge concentrated from the concentration tank. For circulating aeration tank for circulating, it is characterized in that it is not discharged by using the circulating in the wash water of pigs, and the compost produced in the compost is used as an organic fertilizer, there is no pollutant discharged from pig farm facilities Circulation system.