CN111362544A - Method for producing liquid organic fertilizer and clean reuse water of farm from biogas slurry - Google Patents
Method for producing liquid organic fertilizer and clean reuse water of farm from biogas slurry Download PDFInfo
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/02—Biological treatment
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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- C05F3/00—Fertilisers from human or animal excrements, e.g. manure
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
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Abstract
The invention belongs to the technical field of biogas slurry resource utilization, and particularly relates to a method for producing liquid organic fertilizer and clean reuse water of a farm by biogas slurry. In the method, livestock and poultry waste is fed into an anaerobic fermentation device for primary anaerobic fermentation, fermented biogas slurry enters an anaerobic membrane bioreactor for secondary fermentation and in-situ microfiltration membrane separation and filtration, and microfiltration membrane permeate directly enters a reverse osmosis device for concentration treatment. The method can utilize the culture waste to produce methane to prepare liquid organic fertilizer, and the obtained reverse osmosis clear liquid is used as clean reuse water of the culture farm. The method avoids the complex membrane treatment route of mechanical concentration, ultrafiltration, nanofiltration and reverse osmosis combination required in the conventional biogas slurry concentration, greatly simplifies the process and reduces the treatment cost.
Description
Technical Field
The invention belongs to the technical field of biogas slurry resource utilization, and particularly relates to a method for producing liquid organic fertilizer and clean reuse water of a farm by biogas slurry.
Background
With the large-scale and intensive development of animal husbandry in China, the amount of the produced breeding waste is large and centralized, and the breeding waste is a main source of agricultural non-point source pollution. The excrement contains a large amount of easily degradable organic matters, nutrient substances such as nitrogen, phosphorus and the like, and also contains a large amount of water, so that the excrement is an important object for recycling. Anaerobic digestion is an effective technology for treating livestock and poultry manure, can degrade organic matters to generate methane, and retains nutrient components such as nitrogen, phosphorus and the like. However, anaerobic treatment produces a large amount of biogas slurry, so that the content of nutrient components is low, a large amount of water is polluted and cannot be effectively recycled, and the resource treatment of the cultivation waste is limited. How to efficiently produce liquid organic fertilizer containing high-concentration nutrient components and clean recycled water of a culture farm while performing anaerobic treatment on excrement is a difficult problem in the current treatment of culture wastes.
Disclosure of Invention
The invention aims to provide a method for producing liquid organic fertilizer and clean recycled water of a farm by biogas slurry, which simultaneously completes the functions of biodegradation and solid-liquid separation, and ensures that the quality of effluent water is stable and good; the reverse osmosis membrane is used for intercepting and concentrating membrane permeate of the anaerobic membrane bioreactor, so that the aim of highly concentrating organic micromolecule nutrients of biogas slurry is fulfilled, and the utilization value of the biogas slurry is realized; the quality of the liquid fertilizer is improved; no additional substance is needed, and the optimization of the product quality is ensured.
The purpose of the invention is realized by the following technical scheme:
a method for producing liquid organic fertilizer and clean reuse water of a farm by biogas slurry comprises the following steps:
1) primary anaerobic fermentation: adding livestock and poultry waste into an anaerobic fermentation device for anaerobic fermentation, degrading organic matters, producing biogas, and stabilizing biogas residues;
2) secondary anaerobic fermentation and in-situ microfiltration membrane filtration: feeding the biogas slurry after anaerobic fermentation into an anaerobic membrane bioreactor for secondary fermentation, draining water by adopting a microfiltration membrane water pumping mode, mixing concentrated solution after membrane separation with biogas residues in a primary fermentation tank, and feeding membrane permeation clear solution into a subsequent biogas slurry reverse osmosis concentration unit;
3) reverse osmosis: and (3) introducing the clear liquid permeating the anaerobic membrane bioreactor membrane into a reverse osmosis device for reverse osmosis treatment, wherein the produced reverse osmosis concentrated solution is used for producing liquid organic fertilizer, and the reverse osmosis clear liquid is used as clean reuse water of a farm.
In the step 1, medium-temperature or high-temperature anaerobic fermentation is adopted in the primary anaerobic fermentation, the adopted reactor is a sequencing batch type full-mixing reactor, and the hydraulic retention time is 20-40 days.
In the step 2, the secondary anaerobic fermentation adopts medium-temperature fermentation, the adopted reactor is an anaerobic membrane bioreactor, the hydraulic retention time is 5-15 days, and the membrane filtration flux is 5-15L/m2H, the membrane aperture is 0.2-0.4um, and the membrane filtration pressure is-6 kPa-5 kPa.
In the step 3, the membrane flux of the reverse osmosis membrane is 35-40L/m2H, inlet pressure is 2.5-3.5 MPa; and (4) obtaining reverse osmosis concentrated liquor and reverse osmosis clear liquor after reverse osmosis, and stopping concentrating the reverse osmosis concentrated liquor until the volume of the reverse osmosis concentrated liquor is 1/4-1/3 of the volume of the reverse osmosis stock liquor.
The anaerobic fermentation device adopts a fully-mixed reactor which runs in a sequencing batch mode, and under the stirring action, raw materials are fully contacted with microorganisms, so that organic matters are better degraded and converted; the stirrer operates intermittently, the materials are settled after the stirring is stopped, the heavy materials are settled, the materials with low solid content are discharged from the upper part of the reactor and enter a subsequent anaerobic membrane bioreactor, and the materials are fed again after being discharged, so that the circulation process is completed; and periodically discharging biogas residues from the bottom of the reactor.
The anaerobic membrane bioreactor adopts an immersed flat membrane bioreactor, the membrane aperture is 0.2-0.4 mu m, and the working pressure is negative pressure.
The reverse osmosis membrane can effectively intercept monovalent ions, and the aperture of the reverse osmosis membrane only allows NH3、H2The flux of the membrane is 35-40L/m when O passes through the membrane2H, inlet pressure is 2.5-3.5 MPa; the concentration multiplying power is adjusted between 3 times and 10 times in the concentration process of the reverse osmosis membrane, the reverse osmosis concentrated solution contains monovalent ion salts and low molecular weight organic matters, soluble N, P, K, trace elements and nutrient elements are intercepted and concentrated for preparing liquid organic fertilizer, and the reverse osmosis clear solution is used as the clear solution of a farmThe reuse water is cleaned.
The invention has the beneficial effects that:
1) the livestock and poultry waste is put into an anaerobic fermentation device for anaerobic fermentation to degrade organic matters and produce biogas, and biogas slurry after the anaerobic fermentation is put into an anaerobic membrane bioreactor for secondary fermentation, so that the deep degradation of the organic matters is realized, and the waste is fully stabilized;
2) the secondary degradation is carried out in the anaerobic membrane bioreactor, so that the high-efficiency separation of liquid and solid is realized, the membrane permeation clear liquid does not contain suspended solid, the reverse osmosis concentration process can be carried out without further treatment, the membrane treatment process is simplified, and the treatment cost is reduced.
3) The membrane permeate of the anaerobic membrane bioreactor is concentrated by utilizing reverse osmosis membrane filtration, the purpose of high-concentration nutrient substances is achieved, the utilization value of the biogas slurry is improved, the volume of the concentrated liquid is reduced by more than 70%, and the clear liquid obtained by reverse osmosis can be used as clean reuse water of a farm.
4) The method is carried out by adopting a biological-physical method, so that harmful ingredients in the biogas slurry are removed by filtration, effective ingredients in the biogas slurry are fully reserved, and the quality of the liquid fertilizer is improved; no additional substance is needed, and the optimization of the product quality is ensured.
Drawings
FIG. 1 is a flow chart of the method for producing liquid organic fertilizer from biogas slurry and cleaning reuse water in a farm according to the present invention.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
As shown in fig. 1, the method for producing liquid organic fertilizer from biogas slurry and cleaning recycled water in a farm comprises the following steps:
1. primary anaerobic fermentation: introducing livestock and poultry waste into an anaerobic fermentation device for anaerobic fermentation, degrading organic matters to produce biogas, and stabilizing biogas residues;
2. secondary anaerobic fermentation: feeding the biogas slurry after anaerobic fermentation into an anaerobic membrane bioreactor for secondary fermentation, simultaneously performing solid-liquid separation, mixing the concentrated solution after membrane separation with biogas residues in a primary fermentation tank, and feeding the membrane permeate clear solution into a subsequent biogas slurry concentration and utilization unit;
3. reverse osmosis concentration: and (3) introducing the clear liquid permeating the anaerobic membrane bioreactor membrane into a reverse osmosis device for reverse osmosis treatment, wherein the produced reverse osmosis concentrated solution is used for producing liquid organic fertilizer, and the reverse osmosis clear liquid is used as clean reuse water of a farm.
Further, in the step 1, in the primary anaerobic fermentation, medium-temperature or high-temperature anaerobic fermentation is adopted, the adopted reactor is a full-mixing type reactor, the fermentation temperature is 33-40 ℃ or 50-60 ℃, the hydraulic retention time is 20-40 days, the COD removal rate is 80-90%, and the SS removal rate is 60-75%.
Further, in the step 2, in the secondary fermentation, medium-temperature fermentation is adopted, the fermentation temperature is 33-40 ℃, the adopted reactor is an anaerobic membrane bioreactor, the hydraulic retention time is 5-15 days, and the membrane filtration flux is 5-15L/m2H, the membrane aperture is 0.2-0.4um, the membrane filtration pressure is-6 kPa-5 kPa, and the COD removal rate reaches 70% -90%.
Further, in the step 3, the membrane flux of the reverse osmosis membrane is 35-40L/m2H, inlet pressure is 2.5-3.5 MPa; reverse osmosis to obtain reverse osmosis concentrated solution and reverse osmosis clear solution, concentrating the reverse osmosis concentrated solution to 1/4-1/3 of reverse osmosis stock solution volume, and collecting NH in the reverse osmosis clear solution4 +The concentration is lower than 50 mg/L.
Furthermore, the anaerobic fermentation device adopts a fully-mixed reactor which runs in a sequencing batch mode, under the stirring action, the raw materials are fully contacted with microorganisms, organic matters are better degraded and converted, the stirrer runs intermittently, the heavy materials sink after the stirring is stopped, the materials with low solid content are discharged from the upper part of the reactor and enter a subsequent anaerobic membrane bioreactor, and the materials are fed again after being discharged, so that the circulation process is completed; and periodically discharging biogas residues from the bottom of the reactor.
Furthermore, the anaerobic membrane bioreactor adopts an immersed flat membrane bioreactor, the membrane aperture is 0.2 μm or 0.4 μm, and the working pressure is negative pressure.
Further, the reverse osmosis membrane can haveEffectively trapping univalent ions, the pore diameter of which only allows NH3、H2The flux of the membrane is 35-40L/m when O passes through the membrane2H, inlet pressure 2.5-3.5 MPa. The concentration multiplying power is adjusted between 3 times and 10 times in the concentration process of the reverse osmosis membrane, the reverse osmosis concentrated solution contains monovalent ion salts and low molecular weight organic matters, soluble N, P, K, trace elements and nutrient elements are intercepted and concentrated to be used for manufacturing liquid organic fertilizers, and the reverse osmosis clear solution is used as clean reuse water of farms.
Furthermore, the anaerobic fermentation device, the anaerobic membrane bioreactor and the reverse osmosis are controlled by the PLC, so that the full automation is realized, the operation and the management are convenient, and the membrane concentration efficiency is greatly improved.
Example 1:
1. feeding the pig farm liquid dung (water-washed dung) into a sequencing batch type full-mixing reactor for primary anaerobic fermentation, wherein the fermentation temperature is 37 ℃, the hydraulic retention time is 30 days, the COD removal rate reaches 80%, and in the processes of intermittent stirring and static sedimentation, discharging biogas slurry with low solid content for secondary fermentation treatment, wherein the COD concentration in the biogas slurry is 3000mg/L, and the suspended solid concentration is 10000-40000 mg/L.
2. Feeding the biogas slurry in the fully-mixed reactor into an anaerobic membrane bioreactor for secondary fermentation treatment, wherein the fermentation temperature is 37 ℃, the hydraulic retention time is 10 days, and the anaerobic membrane filtration flux is 10L/m2H, the membrane pore size is 0.4um, and the membrane filtration pressure is-5 kPa. On one hand, the anaerobic membrane bioreactor carries out secondary anaerobic fermentation, continues to degrade COD, the degradation rate reaches 90 percent, and the COD content in the membrane permeate liquid is lower than 500 mg/L; on the other hand, about 1/10 concentrated solution was discharged daily and mixed with the biogas residue of the primary fermentation tank.
3. And (4) allowing the membrane permeate of the anaerobic membrane bioreactor to enter a reverse osmosis device for reverse osmosis treatment. The membrane flux of the reverse osmosis membrane is 40L/m2H, inlet pressure 3.5 MPa; concentrating the reverse osmosis concentrated solution to 1/3 of the reverse osmosis stock solution volume, stopping concentrating the reverse osmosis concentrated solution, wherein soluble N, P, K, trace elements and nutrient elements almost exist in the reverse osmosis concentrated solution, the concentration of ammonia nitrogen in the concentrated solution is 900mg/L, and NH in the clear solution is4 +The content is less than 50 mg/L.
The reverse osmosis concentrated solution is used for producing liquid organic fertilizer, and the reverse osmosis clear solution is used as reuse water of a pig raising factory.
The anaerobic fermentation device, the anaerobic membrane bioreactor and the reverse osmosis are controlled by PLC. The time is controlled by a timer in the PLC industrial control board, and then the electromagnet is triggered to be switched on and off to control the opening and closing of the hydraulic and pneumatic valves, so that the automatic feeding and discharging of the fermentation system are realized.
The system can be used for treating 1t of piggery wastewater to obtain 580kg of recycled clean water and 280kg of concentrated liquid fertilizer, about 8400L of biogas is generated, and about 116kg of biogas residues (including biogas residues of a primary fermentation tank and concentrated phase discharge materials of a secondary anaerobic membrane bioreactor) is obtained.
Example 2:
1. feeding the pig farm liquid dung (dry clear dung) into a sequencing batch type full-mixing reactor for anaerobic fermentation, wherein the concentration (SS) of suspended solid in the dung is 6.5g/L, the fermentation temperature is 37 ℃, and the hydraulic retention time is 30 days. In the processes of intermittent stirring and static settlement, the discharged biogas slurry with low solid content is subjected to secondary fermentation treatment, and the concentration of suspended solid in the biogas slurry is 1.8 g/L.
2. Feeding the biogas slurry in the fully-mixed reactor into an anaerobic membrane bioreactor for secondary fermentation treatment, wherein the fermentation temperature is 37 ℃, the hydraulic retention time is 10 days, and the anaerobic membrane filtration flux is 10L/m2H, the membrane pore size is 0.4um, and the membrane filtration pressure is-5 kPa. On one hand, the anaerobic membrane bioreactor carries out secondary anaerobic fermentation, continues to degrade organic matters, and has colorless and odorless membrane permeate liquid without SS (suspended substance) and no detected escherichia coli; on the other hand, about 1/10 concentrated solution was discharged daily and mixed with the biogas residue of the primary fermentation tank.
3. And (4) allowing the membrane permeate of the anaerobic membrane bioreactor to enter a reverse osmosis device for reverse osmosis treatment. The membrane flux of the reverse osmosis membrane is 40L/m2H, inlet pressure 3.5 MPa; concentrating the reverse osmosis concentrated solution to 1/3 of the reverse osmosis stock solution volume, wherein soluble N, P, K, trace elements and nutrient elements are almost all present in the reverse osmosis concentrated solution, and ammonia nitrogen in the concentrated solutionThe concentration is 500mg/L, NH in clear liquid4 +The content is less than 50 mg/L.
The reverse osmosis concentrated solution is used for producing liquid organic fertilizer, and the reverse osmosis clear solution is used as reuse water of a pig raising factory.
The anaerobic fermentation device, the anaerobic membrane bioreactor and the reverse osmosis are controlled by PLC. The time is controlled by a timer in the PLC industrial control board, and then the electromagnet is triggered to be switched on and off to control the opening and closing of the hydraulic and pneumatic valves, so that the automatic feeding and discharging of the fermentation system are realized.
The system can be used for treating 1t of pig farm liquid manure to obtain 530kg of recycled clean water and 260kg of concentrated liquid manure to generate about 2800L of biogas, and about 150kg of biogas residues (including the biogas residues of the primary fermentation tank and the concentrated phase discharge material of the secondary anaerobic membrane bioreactor).
Example 3:
1. the chicken farm manure is sent into a sequencing batch type fully mixed reactor for primary anaerobic fermentation, the total solid concentration (TS) of the manure is 7.5 percent, the concentration (SS) of suspended solid is 45-55g/L, the concentration of ammonia nitrogen is 5360mg/L, the fermentation temperature is 37 ℃, the hydraulic retention time is 25 days, the SS removal rate reaches 60 percent, and the concentration of ammonia nitrogen in biogas slurry is 2500 plus 2800 mg/L. In the processes of intermittent stirring and static settlement, the biogas slurry with low solid content is discharged for secondary fermentation treatment.
2. Feeding the biogas slurry in the fully-mixed reactor into an anaerobic membrane bioreactor for secondary fermentation treatment, wherein the fermentation temperature is 37 ℃, the hydraulic retention time is 8 days, and the anaerobic membrane filtration flux is 12L/m2H, the membrane pore size is 0.4um, and the membrane filtration pressure is-5 kPa. On one hand, the anaerobic membrane bioreactor carries out secondary anaerobic fermentation to continue degrading organic matters, the removal rate of SS reaches 90%, and the ammonia nitrogen concentration in membrane permeation liquid is 150-; on the other hand, about 1/10 concentrated solution was discharged daily and mixed with the biogas residue of the primary fermentation tank.
3. And (4) allowing the membrane permeate of the anaerobic membrane bioreactor to enter a reverse osmosis device for reverse osmosis treatment. The membrane flux of the reverse osmosis membrane is 40L/m2H, inlet pressure 3.5 MPa; concentrating the reverse osmosis concentrated solution to 1/3 volume of reverse osmosis stock solution, and dissolvingDecomposed N, P, K, trace elements and nutrient elements almost exist in the reverse osmosis concentrated solution, the concentration of ammonia nitrogen in the concentrated solution is 4500mg/L, and NH in clear liquid4 +The content is lower than 40 mg/L.
The reverse osmosis concentrated solution is used for producing liquid organic fertilizer, and the reverse osmosis clear solution is used as reuse water of the chicken raising factory.
The anaerobic fermentation device, the anaerobic membrane bioreactor and the reverse osmosis are controlled by PLC. The time is controlled by a timer in the PLC industrial control board, and then the electromagnet is triggered to be switched on and off to control the opening and closing of the hydraulic and pneumatic valves, so that the automatic feeding and discharging of the fermentation system are realized.
The system can process one ton of chicken farm excrement to obtain 555kg of recycled clean water and 277kg of concentrated liquid fertilizer to generate about 3360L of biogas, and the biogas residues (including the biogas residues of the primary fermentation tank and the concentrated phase discharge material of the secondary anaerobic membrane bioreactor) are about 130 kg.
Example 4:
1. and (3) sending the cattle farm liquid dung into a sequencing batch type full-mixing reactor for anaerobic fermentation, wherein the COD concentration in the liquid dung is 20000mg/L, the ammonia nitrogen concentration is 1000mg/L, the fermentation temperature is 37 ℃, and the hydraulic retention time is 30 days. In the processes of intermittent stirring and static sedimentation, the discharged biogas slurry with low solid content is subjected to secondary fermentation treatment, and the COD concentration in the biogas slurry is 2000-4000 mg/L.
2. Feeding the biogas slurry in the fully-mixed reactor into an anaerobic membrane bioreactor for secondary fermentation treatment, wherein the fermentation temperature is 37 ℃, the hydraulic retention time is 10 days, and the anaerobic membrane filtration flux is 10L/m2H, the membrane pore size is 0.4um, and the membrane filtration pressure is-5 kPa. On one hand, the anaerobic membrane bioreactor carries out secondary anaerobic fermentation to continue degrading organic matters, the COD concentration is lower than about 500mg/L, the membrane permeation liquid is colorless and odorless, and no escherichia coli is detected; on the other hand, about 1/10 concentrated solution was discharged daily and mixed with the biogas residue of the primary fermentation tank.
3. And (4) allowing the membrane permeate of the anaerobic membrane bioreactor to enter a reverse osmosis device for reverse osmosis treatment. The membrane flux of the reverse osmosis membrane is 40L/m2H, inlet pressure 3.5 MPa; reverse osmosis to obtain reverse osmosis concentrated solution and reverse osmosis clear solution, and separating the reverse osmosis concentrated solutionConcentrating to 1/3 of the volume of the reverse osmosis stock solution, wherein soluble N, P, K, trace elements and nutrient elements almost exist in the reverse osmosis concentrated solution, the concentration of ammonia nitrogen in the concentrated solution is 600mg/L, and NH in clear solution4 +The content is less than 50 mg/L.
The reverse osmosis concentrated solution is used for producing liquid organic fertilizer, and the reverse osmosis clear solution is used as reuse water of a cattle raising factory.
The anaerobic fermentation device, the anaerobic membrane bioreactor and the reverse osmosis are controlled by PLC. The time is controlled by a timer in the PLC industrial control board, and then the electromagnet is triggered to be switched on and off to control the opening and closing of the hydraulic and pneumatic valves, so that the automatic feeding and discharging of the fermentation system are realized.
The system can be used for treating 1t of cattle farm wastewater to obtain 550kg of recycled clean water and 270kg of concentrated liquid fertilizer, and can generate 11200L of biogas and 130kg of biogas residues (including biogas residues of a primary fermentation tank and concentrated phase discharge materials of a secondary anaerobic membrane bioreactor).
Claims (7)
1. A method for producing liquid organic fertilizer and clean reuse water of a farm by biogas slurry is characterized by comprising the following steps: the method comprises the following steps:
1) primary anaerobic fermentation: adding livestock and poultry waste into an anaerobic fermentation device for anaerobic fermentation, degrading organic matters, producing biogas, and stabilizing biogas residues;
2) secondary anaerobic fermentation and in-situ microfiltration membrane filtration: feeding the biogas slurry after anaerobic fermentation into an anaerobic membrane bioreactor for secondary fermentation, draining water by adopting a microfiltration membrane water pumping mode, mixing concentrated solution after membrane separation with biogas residues in a primary fermentation tank, and feeding membrane permeation clear solution into a subsequent biogas slurry reverse osmosis concentration unit;
3) reverse osmosis: and (3) introducing the clear liquid permeating the anaerobic membrane bioreactor membrane into a reverse osmosis device for reverse osmosis treatment, wherein the produced reverse osmosis concentrated solution is used for producing liquid organic fertilizer, and the reverse osmosis clear liquid is used as clean reuse water of a farm.
2. The method for producing liquid organic fertilizer and cleaning reuse water of a farm according to claim 1, which comprises the following steps:
in the step 1, medium-temperature or high-temperature anaerobic fermentation is adopted in the primary anaerobic fermentation, the adopted reactor is a sequencing batch type full-mixing reactor, and the hydraulic retention time is 20-40 days.
3. The method for producing liquid organic fertilizer and cleaning reuse water of a farm according to claim 1, which comprises the following steps:
in the step 2, the secondary anaerobic fermentation adopts medium-temperature fermentation, the adopted reactor is an anaerobic membrane bioreactor, the hydraulic retention time is 5-15 days, and the membrane filtration flux is 5-15L/m2H, the membrane aperture is 0.2-0.4um, and the membrane filtration pressure is-6 kPa-5 kPa.
4. The method for producing liquid organic fertilizer and cleaning reuse water of a farm according to claim 1, which comprises the following steps:
in the step 3, the membrane flux of the reverse osmosis membrane is 35-40L/m2H, inlet pressure is 2.5-3.5 MPa; and (4) obtaining reverse osmosis concentrated liquor and reverse osmosis clear liquor after reverse osmosis, and stopping concentrating the reverse osmosis concentrated liquor until the volume of the reverse osmosis concentrated liquor is 1/4-1/3 of the volume of the reverse osmosis stock liquor.
5. The method for producing liquid organic fertilizer and cleaning reuse water of a farm according to any one of claims 1 to 4, which comprises the following steps:
the anaerobic fermentation device adopts a fully-mixed reactor which runs in a sequencing batch mode, and under the stirring action, raw materials are fully contacted with microorganisms, so that organic matters are better degraded and converted; the stirrer operates intermittently, the materials are settled after the stirring is stopped, the heavy materials are settled, the materials with low solid content are discharged from the upper part of the reactor and enter a subsequent anaerobic membrane bioreactor, and the materials are fed again after being discharged, so that the circulation process is completed; and periodically discharging biogas residues from the bottom of the reactor.
6. The method for producing liquid organic fertilizer and cleaning reuse water of a farm according to any one of claims 1 to 4, which comprises the following steps:
the anaerobic membrane bioreactor adopts an immersed flat membrane bioreactor, the membrane aperture is 0.2-0.4 mu m, and the working pressure is negative pressure.
7. The method for producing liquid organic fertilizer and cleaning reuse water of a farm according to any one of claims 1 to 4, which comprises the following steps:
the reverse osmosis membrane can effectively intercept monovalent ions, and the aperture of the reverse osmosis membrane only allows NH3、H2The flux of the membrane is 35-40L/m when O passes through the membrane2H, inlet pressure is 2.5-3.5 MPa; the concentration multiplying power is adjusted between 3 times and 10 times in the concentration process of the reverse osmosis membrane, the reverse osmosis concentrated solution contains monovalent ion salts and low molecular weight organic matters, soluble N, P, K, trace elements and nutrient elements are intercepted and concentrated to be used for manufacturing liquid organic fertilizers, and the reverse osmosis clear solution is used as clean reuse water of farms.
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