KR100809607B1 - Processing mothod and processing equipment for excretions of animals - Google Patents

Abstract

A method and an apparatus for treating livestock excretion are provided to purify the livestock excretion and collect resources efficiently, by performing a pretreatment process, an adjustment process, a methane fermentation process, a temperature decrease process, and a bath reaction process, and three treatment processes on the livestock excretion. A pretreatment process is performed by removing adulterant and sediment from livestock excretion(S210). An adjustment process is performed by homogenizing the flow rate and concentration of the livestock excretion passed by the pretreatment process(S220). An acid fermentation process is performed by converting the homogenized livestock excretion into dissolvable organic matter through acid fermentation and performing solid-liquid separation through precipitation(S230). A methane fermentation process is performed by recovering methane gas and precipitating sludge from the dissolvable organic matter through methane fermentation(S240). A temperature decrease process is performed by decreasing the temperature of the treated water, which is generated during the methane fermentation process, to a temperature suitable for aerobic treatment, 30‹C(S250). A batch reaction process is performed by removing residual organic matter and nutrient salt and precipitating sludge from the treated water, which is generated during the temperature decrease process(S260). A refinement process is performed by removing carbon dioxide, hydrogen sulfide, and moisture from the methane gas generated during the methane fermentation process. A cogeneration process is performed by collecting electricity and waste heat using the refined methane. A dehydration process is performed by dehydrating the sludge generated during the acid fermentation process and the methane fermentation process. A dry process is performed by drying the dehydrated sludge using the waste heat. Further, a third treatment process is performed by removing additionally hardly-degradable organic compounds and nutritive salts remaining after the batch reaction process.

Description

PROCESSING MOTHOD AND PROCESSING EQUIPMENT FOR EXCRETIONS OF ANIMALS}

1 is a schematic diagram of a conventional livestock waste treatment process,

2 is a flow chart of the livestock waste treatment process of the present invention,

3 is a view showing an embodiment of a livestock waste treatment facility of the present invention.

*** Explanation of symbols for main parts of drawing ***

310; pretreatment facility 320; adjustment tank

330 acid fermentation tank 331: water bypass line

340; methane fermentation tank 341; treated water return line

350; heat exchanger 360; batch reactor;

361; Sludge Return Line 370; Tertiary Treatment Facility

380; dehydration facility 381; drying facility

390; Refinery 391; Power Plant

The present invention relates to a livestock manure treatment method, more specifically, by the livestock manure consisting of pretreatment step, adjustment step, anaerobic step, temperature reduction step, advanced treatment step, tertiary treatment step, the livestock manure efficiently And recovering resources.

Livestock manure is known to be difficult to treat due to its high solids, organic matter and nitrogen content. Existing livestock manure treatment method, as shown in Figure 1, as a first pretreatment to remove the solids through the physicochemical process, secondly to remove the residual organic matter and nutrients through the biological advanced treatment process, and to the third physicochemical process Removes any remaining contaminants.

In order to maintain low nitrogen concentration in treated water by treating wastewater containing high concentration of nitrogen like livestock wastewater, after nitrification is completed in aerobic condition, denitrification process is required, and organic matter in wastewater under aerobic condition for nitrification. Since all of them are oxidized, a problem arises in that the organic substance cannot be efficiently used in the denitrification step. In other words, post-denitrification is a process of completely removing the nitrified nitrogen remaining after the nitrification of the previous step, and thus, it is economically disadvantageous to additionally inject an external carbon source such as methanol to secure an organic material for denitrification.

In addition, the livestock wastewater treatment method on which the existing aerobic process is based has a disadvantage of producing sludge more than anaerobic treatment method, having high energy consumption and efficiently recovering organic matter, which is a useful resource, and especially containing high concentration organic matter. There was a problem that was not suitable for waste water.

An object of the present invention is to provide a method for treating livestock manure that can maximize the resources available to the livestock manure in order to solve these problems and ensure a stable treated water quality.

The present invention is to recover the methane gas through the anaerobic process of the organic matter in the livestock manure to produce electricity and waste heat through cogeneration, the waste heat is again used for the treatment process of livestock manure.

In addition, it aims to minimize the amount of sludge generated from livestock manure and recover the compost which is safe and easy to handle through drying.

Livestock manure treatment method of the present invention to achieve the above object, the pretreatment step of removing contaminants and sediment contained in the livestock manure; adjusting to homogenize the flow rate and concentration of the livestock manure treated by the pretreatment step An acid fermentation step of converting the homogenized particulate acidic manure organic material in the granular state into an acid fermentation tank, converting it into a dissolved state through acid fermentation, and performing solid-liquid separation through precipitation; from the dissolved organic matter treated in the acid fermentation process A methane fermentation process for recovering methane; a temperature reduction process for introducing the treated water of the methane fermentation process into a temperature reducing facility to lower the temperature of the treated water to 30 ° C. or lower, which is a temperature suitable for subsequent aerobic treatment; A batch reaction process which is a highly treated step of removing residual organic matter and nutrients from the treated water passing through the treatment step; Characterized in that it comprises; I further tertiary treatment process for removing the decomposable organic matter and nitrogen.

In the present invention, in order to supply the organic matter required for the batch reaction step to adjust the C / N, C / P, the acid which partially bypasses the treated water passed through the acid fermentation step to the batch reaction step (by-pass) It further includes a fermentation process bypassed water and a methane fermentation tank treated water reprocessing process to prevent the pH lowering of the acid fermentation process and to ensure alkalinity by returning and partially treating the treated water of the methane fermentation process to the acid fermentation process. Characterized in that.

The method further includes a purification process for removing carbon dioxide, hydrogen sulfide, and moisture contained in the methane gas produced through the methane fermentation process, and a cogeneration process, thereby recovering electricity and waste heat using the purified methane. The recovered waste heat is recycled to the sludge drying process, acid fermentation process and methane fermentation process.

The sludge discarded in the batch reaction process is returned to the control process and reprocessed to minimize sludge production and dilute the ammonia concentration in the acid fermentation process to remove ammonia toxicity in the anaerobic process.

In addition, the sludge generated through the acid fermentation process and the methane fermentation process is used to produce compost through the dehydration process; and the drying process using the waste heat.

As shown in Figure 2, the livestock manure treatment method proposed by the present invention is a pretreatment step (S210) for removing the contaminants and sediment contained in the livestock manure and the livestock manure through the pretreatment step flows into the flow adjustment tank Adjustment step for homogenizing the flow rate and concentration of livestock manure (S220), as an anaerobic treatment process, the organic matter in the livestock manure, which is present in solid form in an acid fermentation tank, is first converted into a dissolved organic matter through hydrolysis and acid production steps. Acid fermentation step of converting (S230), the methane fermentation step of recovering the dissolved organic matter converted in the acid fermentation tank to methane (CH ₄ ) through the methane fermentation in the methane fermentation tank (S240), the treatment passed through the anaerobic reactor A temperature reduction step (S250) for introducing water into a temperature reduction facility (heat exchanger) and lowering the temperature to a temperature (30 ° C. or lower) suitable for subsequent aerobic treatment. Batch reaction step (S260) to remove the residual organic matter and nutrients (nitrogen and phosphorus) in the batch water reactor, if the discharge water quality is high, by introducing a tertiary treatment facility to the rear end of the batch reactor, the remaining hardly decomposable organic matter and Nitrogen, nutrients further comprises a third step (S270). Detailed description of the livestock manure treatment process is as follows.

1. Pretreatment process ( S210 )

Pretreatment removes contaminants and sediment contained in livestock manure.

2. Adjustment process S220 )

 The livestock manure that has passed through the pretreatment step is introduced into the flow adjusting tank to homogenize the flow rate and concentration of the livestock manure.

3. Anaerobic treatment process

The anaerobic reaction process is a reaction for converting organic matter in livestock wastewater into organic acid, which is easily ingested by microorganisms, and finally recovering it to methane.

Anaerobic process is a process of decomposing organic matter by various anaerobic bacteria (fermentation by microorganisms that do not require oxygen), and the organic decomposition step of the anaerobic process and the microorganisms related to each step are as follows.

Degradation step of organic matter in anaerobic process and related microorganisms step  designation  Related Microorganisms One Solubilization Acidogenic 2 Acidogenesis 3 Acetogenesis Acetogenic 4 Methanogenesis Methanogenic

Anaerobic treatment in the treatment of high concentration livestock wastewater causes the hydrolysis or dissolution to occur in the first stage, and the polymer compound becomes a monomer, and the second stage is acidogenesis, and the simple unit is volatile fatty acid. The third step is acetic acid production and the fourth is methane production.

These reaction stages can be divided into two stages: acid production and methanogenesis. The appropriate pH at each stage is 6.0-7.0 for acid production and 7.0- for methanogenesis. Differs from 8.0. For this reason, the anaerobic process of the present invention consists of two phases in order to obtain the optimum efficiency of each stage, the first reactor is an acid fermentation tank, the second reactor is operated as a methane fermentation tank.

(One) Acid Fermentation Process ( S230 )

 An acid fermentation process of introducing the homogenized particulate acidic manure organic material into an acid fermentation tank, converting it into a dissolved state through acid fermentation, and performing solid-liquid separation through precipitation;

In the first fermentation tank, the acid fermentation tank converts the organic matter in the livestock manure, which is present in solid form, into a dissolved state through hydrolysis and acid production, and performs solid-liquid separation through precipitation. In the anaerobic process, since acid is mainly produced in the acid production reactor, a pH decrease occurs due to the formation of an acid, and when the pH is excessively reduced, microbial activity decreases. In order to prevent this, there is an economic disadvantage because the conventional injection of an alkaline agent has to purchase a separate drug.

Therefore, in the present invention, to prevent this, a portion of the treated water passing through the methane fermentation tank, which is the second reaction tank, is returned to the acid fermentation tank to supplement the alkalinity.

(2) methane fermentation process ( S240 )

The methane fermentation tank, the second reaction tank of the anaerobic treatment process, recovers the dissolved organic matter converted from the acid fermentation tank to methane (CH ₄ ) through methane fermentation. The gas produced through the methane fermentation is composed of 60 to 70% of methane, 30 to 40% of carbon dioxide, and other hydrogen sulfide, moisture, and trace gases, and a column filled with KOH dissolved in sewage treatment water, river water, and groundwater. ) Is passed from the bottom to the top to remove carbon dioxide using the solubility difference between methane and carbon dioxide, followed by a purification process to remove desulfurization and moisture, and then recover electricity and waste heat from the combined methane gas through cogeneration.

In addition, the sludge generated through the acid and methane fermentation process is used as a compost through drying after dehydration because the organic matter is stabilized. The energy required for drying utilizes waste heat recovered from cogeneration with methane. Waste heat recovered through the generator's cooling water can be used to dry the sludge only when the temperature is over 100 ℃, because the water contained in the sludge does not vaporize below 100 ℃ as the adsorbed water. In order to achieve this purpose, a generator of a high temperature cooling method in which the temperature of the cooling water is operated at 100 ° C. or higher is used, and the waste heat in the exhaust gas of the generator is additionally utilized.

Waste heat recovered through cogeneration is used for sludge drying as described above, and then the temperature is lowered to about 50-60 ° C. Since it is used to increase the temperature of the acid fermentation tank anaerobic treatment process, the temperature is reduced to about 30 ~ 40 ℃, used to maintain the temperature of the methane fermentation tank and then circulated to the generator to play an efficient waste heat recovery and cooling water.

That is, in the case of Korea, heat loss occurs through the outer wall of the reactor due to the temperature decrease in winter, and it is difficult and economically disadvantageous to operate a separate boiler facility and fuel required to operate the boiler to maintain the temperature of the reactor. However, the waste heat recovered can be reused to maintain the temperature by heating the acid fermentation tank and the methane fermentation tank, thereby economically reducing the operating cost of the treatment plant.

The treated water passing through the methane fermentation tank is then purified through an advanced treatment process.

4. Temperature reduction process S250 )

Anaerobic processes are divided into medium and high temperature digestion processes depending on the operating temperature. In the middle temperature process, about 35 ° C is the optimum temperature, and in the high temperature process, 50 ° C is known as the optimum temperature.

When the temperature in the batch reactor exceeds 40 ℃ the microbial activity is reduced and the nitrogen removal efficiency is sharply reduced. In the present invention, the anaerobic process is operated at a medium temperature (about 35 ℃) or a high temperature (about 55 ℃) to be introduced into the batch reactor In this case, since the temperature of the batch reactor may be excessively increased and nitrification may be inhibited, a cooling facility is introduced at the front of the batch reactor to reduce the temperature of the livestock wastewater to 30 ° C. or less.

In other words, the treated water that has passed through the anaerobic reactor is introduced into a temperature reduction facility (heat exchanger) to lower the temperature (30 ° C. or lower) suitable for subsequent aerobic treatment. The cooling system may use a cooler, and if the sewage treatment plant or a river is nearby, it uses a heat exchanger to lower the temperature.

5. Advanced treatment process: Batch reaction process ( S260 )

Generally, the treated water of anaerobic digestion process is organic matter removed, but nutrients such as nitrogen and phosphorus are not removed, so the treated water quality is not good compared to aerobic process. need.

The treated water passed through the anaerobic process lowered to an appropriate temperature (30 ° C. or lower) through the heat exchanger is treated with a subsequent batch reactor since the concentration of organic matter and especially nitrogen is high. The treated water introduced into the batch reactor removes residual organic matter and nutrients (nitrogen and phosphorus).

However, since most organics are removed in the anaerobic process, the C / N ratio is very low, such as about 0.5, and thus, there is a shortage of organic matter necessary for denitrification, and thus nitrogen cannot be effectively treated.

In order to maintain the nitrogen concentration in the treated water by treating wastewater containing high concentration of nitrogen, the denitrification process is required after nitrification is completed under aerobic conditions.Denitration is carried out because all organic matter in the wastewater is oxidized under aerobic conditions for nitrification. The problem arises that the organic matter cannot be used efficiently in the process. In other words, the anaerobic digestion process is difficult to secure C / N and C / P to remove nutrients, so it is necessary to supply a separate external carbon source such as methanol.

In order to solve this problem, organic matters necessary for the batch reaction process for nitrogen removal are bypassed by a part of the treated water of the acid fermentation process to the batch reaction tank, so that the C / N ratio of the livestock wastewater flowing into the batch reaction tank is nitrogen. Make it 3 to 4 suitable for removal.

The batch reactor is operated in an alternating manner in which anoxic and aerobic cycles are repeated, and nitrification at aerobic induction leads to denitrification at anoxic. In general, wastewater purification includes nitrification (aerobic process) of nitrifying NH ₃ -N (ammonia nitrogen) into NO ₃ -N (nitrogen nitrogen) in the waste water, and NO ₃ -N (nitrogen nitrogen). A denitrification step (anaerobic step or anoxic step) is carried out to denitrate with ₂ (nitrogen gas). Organic matter necessary for denitrification under anoxic conditions can be obtained by bypassing the effluent from the acid fermentation tank to obtain necessary organic matter. The inflow of effluent is injected under anoxic conditions and the injection is stopped under aerobic conditions so that nitrification is smoothed.

On the other hand, the sludge discarded in the batch reactor is returned to the flow control tank by a predetermined amount after the precipitation process, and then injected into the anaerobic reactor to minimize the amount of sludge generated by recovering the carbon source. In addition, since a large amount of ammonia nitrogen is present in the livestock manure, ammonia toxicity can be generated in the anaerobic reactor to reduce the activity of microorganisms.By returning sludge from which nitrogen is removed, nitrogen concentration in the influent can be reduced. Solve the toxicity problem.

6. Tertiary treatment process S270 )

If the discharged water is strict, a third treatment process is introduced at the rear of the batch reactor to further remove residual hardly decomposable organic matter, nitrogen and nutrients. The tertiary treatment facility consists of a pressurized temperature flotation and a biofilm process, but other techniques showing the same efficiency are applicable.

The process according to the invention is suitable for the treatment and recycling of livestock manure but has the same effect when applied to other wastewater containing high concentrations of organic matter and nitrogen.

Hereinafter, the recovery of resources by the livestock waste treatment method of the present invention will be described.

Electricity generation

Carbon dioxide, hydrogen sulfide, and moisture contained in methane gas produced through the methane fermentation process (S340) are removed and purified, and the purified methane gas is recovered electricity and waste heat through cogeneration.

Waste heat recovery

The recovered waste heat is recycled through the waste heat circulation line to increase the temperature of the drying process, acid fermentation process and methane fermentation process to dry the sludge generated in the anaerobic treatment process.

Sludge

The sludge generated through the acid fermentation process and the methane fermentation process is dried through a dehydration facility and a drying facility that is dried using waste heat, and then used as compost.

On the other hand, the sludge discarded in the batch reactor is returned to the flow control tank by a predetermined amount after the precipitation process, and then injected into the anaerobic reactor to minimize the amount of sludge generated by recovering the carbon source.

3 is a view of a livestock waste treatment facility performing the same process as in FIG. 2. The livestock waste treatment facility shown in FIG. 3 includes a pretreatment facility 310, an adjustment tank 320, an acid fermentation tank 330, and a methane fermentation tank ( 340, heat exchanger 350, batch reactor 360, batch reactor 370, treated water bypass line 331, treated water return line 341, sludge conveyance line 361, dewatering facility 380, It includes a drying facility 381, a purification facility 390, and a power generation facility 391.

 The pretreatment facility 310 is a facility in which livestock wastewater to be treated is introduced to remove contaminants and sediment, and is composed of a contaminant treatment unit and the like. Livestock manure that has passed through the pretreatment facility 310 is introduced into the adjustment tank 320, the adjustment tank 320 homogenizes the flow rate and concentration of the livestock manure as the water tank to control the flow rate and concentration. Homogenized livestock manure is introduced into the anaerobic reactor by anaerobic treatment.

Anaerobic process is a process of decomposing organic matter by various anaerobic bacteria (fermentation by microorganisms that do not require oxygen), anaerobic reaction tank to the first reaction tank acid fermentation tank 330 and the second reaction tank methane fermentation tank (340) It is constructed sequentially.

The acid fermentation tank 330 converts the organic matter in the livestock manure present in the solid form into a dissolved organic material through hydrolysis and acid production steps. The livestock manure introduced into the acid fermentation tank 330 which is operated in an unstirred state is subjected to acid fermentation, and solids are precipitated and accumulated for a predetermined time.

The treated water that has passed through the acid fermentation tank 330 in which the solids are filtered is introduced into the methane fermentation tank 340. Methane fermentation tank 340 methane fermentation of the dissolved organic matter converted in the acid fermentation tank 330. The gas produced through the methane fermentation is composed of 60 to 70% of methane, 30 to 40% of carbon dioxide, and other hydrogen sulfide, moisture, and trace gases, and a column filled with KOH dissolved in sewage treatment water, river water, and groundwater. ) Through a purification plant 390 to remove carbon dioxide and remove desulfurization and moisture by using a solubility difference between methane and carbon dioxide from the bottom to the top, and then through cogeneration from methane gas purified in the power plant 391. Recover electricity and waste heat. In the cogeneration plant, a high temperature cooling generator is used to obtain waste heat of 100 ° C. or higher.

In addition, the sludge generated through the acid fermentation and methane fermentation process is produced as a compost through the dehydration and drying facilities in order to stabilize the organic matter. Energy required in the drying facility utilizes waste heat recovered from cogeneration with methane.

On the other hand, in the anaerobic process, since acid is mainly produced in the acid production reaction tank, a pH decrease occurs due to the formation of an acid, and when the pH is excessively reduced, microbial activity decreases. In order to prevent this, the present invention supplements the alkalinity by providing a treated water return line 341 for introducing the treated water passing through the methane fermentation tank into the acid fermenting tank.

The treated water passing through the methane fermentation tank is introduced into a temperature reducing facility (heat exchanger) to reduce the temperature, and the heat exchanger 350 reduces the introduced treated water to a temperature (30 ° C. or lower) suitable for subsequent aerobic treatment. . The treated water cooled to an appropriate temperature (below 30 ° C.) through the heat exchanger 350 is introduced into the batch reactor 360 for the advanced treatment because the concentration of organic matter and especially nitrogen is high.

Batch reactor 360 is an advanced treatment facility and operates in an alternating manner of anoxic and aerobic repetition and removes organic matter and nutrients (nitrogen and phosphorus) by nitrification upon aerobic induction of denitrification. In order to maintain the nitrogen concentration in the treated water by treating wastewater containing high concentration of nitrogen, denitrification process is required after nitrification is completed under aerobic conditions. The problem arises that the organic matter cannot be used efficiently in the process. In order to solve this problem, organic matter necessary for denitrification in anoxic conditions is solved by additionally installing a treatment water bypass line 331 connected to the heat exchanger so that the treated water of the acid fermentation tank does not go through the methane fermentation tank. That is, some of the acid fermentation tank treated water cooled in the heat exchanger is cooled through the heat exchanger and then bypassed to the batch reactor 360 so that the C / N ratio of the livestock wastewater is about 3 to 4 suitable for nitrogen removal.

On the other hand, the sludge conveying line 361 is further installed in the batch reactor 360 so as to convey the sludge by a fixed amount by the adjusting tank. The sludge is introduced into the adjustment tank 320 through the conveying line 361 by a predetermined amount after the precipitation process, and is returned to the anaerobic reaction tank to recover the carbon source. In addition, a large amount of ammonia nitrogen is present in the livestock manure, which may cause ammonia toxicity in the anaerobic reactor, thereby reducing the activity of microorganisms. Lowering it has the effect of solving this toxicity problem.

If the discharge water is strict, the third treatment facility 370 is introduced to the rear of the batch reactor 360 to further remove the remaining hardly decomposable organic matter, nitrogen, and nutrients. The tertiary treatment facility 370 is composed of a pressurized temperature flotation and a biofilm process, but other techniques showing the same efficiency may be applied.

The present invention recovers the organic matter in the livestock manure as methane and uses the produced methane to produce electricity through cogeneration to cover the electricity required to operate the treatment process and the recovered waste heat is sludge drying, acid fermentation tank, methane fermentation tank temperature It can be used for maintenance.

The present invention can be efficiently and economically treated / recycled livestock manure, minimize the amount of sludge generated and secure a safe and easy compost through drying.

In addition, to remove nutrients after the anaerobic process, it is not necessary to supply a separate external carbon source, and it can secure economical efficiency by minimizing the chemical requirement required for operation.

The present invention can achieve the resource recovery and environmental protection at the same time because it can make the most of the resources available part of the livestock manure and ensure the stable treatment water quality by the introduction of additional treatment process.

In the above description of the preferred embodiment of the present invention, those skilled in the art will be able to perform various modifications without departing from the gist of the present invention, and such modifications are within the protection scope of the present invention. The protection scope of the present invention should be construed as described in the claims.

Claims (13)

A pretreatment step of removing the impurities and sediment contained in the livestock manure; An adjusting step of homogenizing the flow rate and the concentration in the livestock manure that has passed the pretreatment step in a flow adjusting tank; An acid fermentation process of introducing the homogenized particulate livestock manure organic matter into an acid fermentation tank, converting it into a dissolved state through acid fermentation, and performing solid-liquid separation through precipitation; A methane fermentation step of recovering methane gas through methane fermentation and introducing sludge into the methane fermentation tank by dissolving the organic matter passed through the acid fermentation process; A temperature reduction step of lowering the temperature of the treated water to 30 ° C. or lower, which is a temperature suitable for aerobic treatment by introducing the treated water that has passed through the methane fermentation process into a temperature reducing facility; A batch reaction step which is a highly treated step of removing residual organic matter and nutrients from the treated water passing through the anaerobic treatment step in which the temperature is lowered and settling sludge; A purification step of removing carbon dioxide, hydrogen sulfide, and moisture contained in the methane gas produced through the methane fermentation process; A cogeneration process for recovering electricity and waste heat using the purified methane; A dehydration step of dewatering the sludge generated through the acid fermentation process and the methane fermentation process through a dehydration facility; And And a drying step of drying the dewatered sludge using the waste heat. The method of claim 1, Livestock manure treatment method characterized in that it further comprises a third treatment step for additionally removing the hardly decomposable organic matter and nutrients remaining after the batch reaction process. The method of claim 1, Acid fermentation process treated water which partially bypasses the treated water that has passed the acid fermentation process to the batch reaction process in order to adjust C / N and C / P by supplying the organic substance necessary for the batch reaction process. Livestock manure treatment method further comprising a bypass step. The method of claim 1, Livestock manure, characterized in that the methane fermentation tank treated water reprocessing step to prevent the pH lowering of the acid fermentation process and to ensure alkalinity by returning a portion of the treated water of the methane fermentation process to the acid fermentation process Treatment method. The method of claim 1, In order to minimize sludge production and dilute the ammonia concentration in the acid fermentation process to remove the ammonia toxicity of the anaerobic process, the sludge reprocessing step of returning the sludge discarded in the batch reaction process to the adjustment process is further included. Livestock manure treatment method characterized in that. delete The method of claim 1, And a waste heat recovery step of circulating the recovered waste heat into the acid fermentation step and the methane fermentation step. delete A pretreatment facility for carrying out a pretreatment process for removing contaminants and sediment contained in the livestock manure; An adjusting tank for homogenizing the flow rate and concentration of the livestock manure treated by the pretreatment step; An acid fermentation tank for performing an acid fermentation process for converting the particulate acidic manure organic matter in a dissolved state into a dissolved state; A methane fermentation tank performing a methane fermentation process for recovering methane gas from methane fermentation and precipitating sludge from the dissolved organic matter treated in the acid fermentation process; A temperature reduction facility for introducing the treated water of the methane fermentation process into a temperature reduction facility to lower the temperature of the treated water to 30 ° C. or less, which is a temperature suitable for subsequent aerobic treatment; A batch reactor for performing a batch reaction step of removing residual organic matter and nutrients from the treated water of the anaerobic treatment step in which the temperature is lowered; Tertiary treatment facilities to remove additional hardly degradable organics and nitrogen; A purification facility for removing carbon dioxide, hydrogen sulfide, and moisture contained in methane gas converted in the methane fermentation tank; And Livestock manure treatment facility comprising a; cogeneration plant for recovering electricity and waste heat using the purified methane gas. The method of claim 9, A treatment water bypass line for partially bypassing the treated water passing through the acid fermentation tank to the batch reaction tank in order to control C / N and C / P by supplying organic materials necessary for the batch reaction process; Treated water return line for conveying a portion of the treated water passed through the methane fermentation tank to the acid fermentation tank in order to prevent the pH lowering of the acid fermentation tank and ensure alkalinity; And A sludge conveying line for returning sludge discarded in the batch reactor to the acid fermentation tank for reprocessing in order to minimize sludge production and to remove toxicity by diluting the ammonia concentration of the acid fermentation tank. Manure processing facility. delete The method of claim 9, The cogeneration plant is a livestock waste treatment facility, characterized in that using a high-temperature cooling generator to obtain waste heat of 100 ℃ or more. The method of claim 9, A dehydration system for removing water from the sludge discarded from the acid fermentation tank and the methane fermentation tank; Livestock waste treatment plant further comprises a drying facility for drying the dewatered sludge using the waste heat.

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