CN113845273A - Method for efficiently removing nitrogen and carbon from anaerobic effluent of pig raising wastewater - Google Patents
Method for efficiently removing nitrogen and carbon from anaerobic effluent of pig raising wastewater Download PDFInfo
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Abstract
The invention discloses a method for efficiently removing nitrogen and carbon from anaerobic effluent of pig wastewater, which comprises the following steps of firstly removing suspended solids contained in incoming water in a coagulating sedimentation system by utilizing polyacrylamide and polyaluminium chloride; the anaerobic hydrolysis tank is utilized to intensively convert organic matters in water into organic acids again to serve as effective carbon sources for subsequent heterotrophic denitrification, COD is reduced, and the appropriate C/N ratio of subsequent nitrosation, anaerobic ammonium oxidation and denitrification reactions is ensured; most of ammonia nitrogen, total nitrogen and COD in the incoming water are removed by using an SNAD system, the aeration quantity of the reactor is limited to ensure that free ammonia with certain concentration exists in the reactor to keep the inhibition effect on nitrite oxidizing bacteria, so that more ammonia nitrogen is converted into nitrite and finally converted into nitrogen; and finally, maintaining an anaerobic environment in the short-range sulfur autotrophic denitrification-anaerobic ammonia oxidation reactor to ensure that ammonia nitrogen is not oxidized, and controlling the sulfur adding amount to achieve the aims of reducing the sulfur adding amount and saving the medicament consumption.
Description
Technical Field
The invention relates to the technical field of livestock and poultry breeding wastewater treatment, in particular to a method for efficiently removing nitrogen and carbon from anaerobic effluent of pig breeding wastewater.
Background
The scale of the pig breeding industry in China is increasing day by day, and the discharge amount of the waste water generated by pig breeding is increasing continuously. Statistical data from the second national census of sources of pollution (6.8.2020) indicate that: in the discharge amount of water pollutants of a national livestock and poultry scale farm in 2017, 604.83 million tons of Chemical Oxygen Demand (COD), 7.5 million tons of ammonia nitrogen and 37 million tons of total nitrogen are contained. The pig raising wastewater mainly comprises animal excrement, urine, feed residues and colony house washing water, mainly contains pollutants such as ammonia nitrogen, COD (chemical oxygen demand) and the like, can cause environmental problems such as water eutrophication, land pollution and the like, and causes serious harm to people and the surrounding environment, so that the technology for denitrifying the sewage wastewater is extremely important.
The current pig-raising wastewater treatment plant is generally far away from urban areas, and the effluent is difficult to access to municipal sewage pipelines, so that the sewage is required to have higher water quality after being treated; the traditional nitrification and denitrification process has the problems of long retention time and extremely high operating cost. Under the circumstance of more severe environmental management, how to improve the sewage treatment process becomes a problem to be solved urgently.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a method for efficiently denitrifying and decarbonizing anaerobic effluent of pig wastewater, aiming at ensuring the stability of denitrification and decarbonization efficiency, and simultaneously reducing the running power consumption and the medicament consumption so as to efficiently treat the total nitrogen of the wastewater with low consumption.
In order to achieve the purpose, the application provides a method for efficiently removing nitrogen and carbon from anaerobic effluent of pig wastewater, which comprises a coagulating sedimentation step, an anaerobic hydrolysis step, a synchronous nitrosation-anaerobic ammonia oxidation-denitrification step and a short-range sulfur autotrophic denitrification-anaerobic ammonia oxidation step;
the coagulating sedimentation step comprises the following steps: adding 1-5 mg/L of polyaluminum chloride (PAC), stirring at the rotating speed of 50-200 r/min for 20-30 min, then adding 0.8-1.2mg/L of Polyacrylamide (PAM), and stirring at the rotating speed of 90-110r/min for 20-30 min;
the anaerobic hydrolysis step comprises the following steps: setting the concentration of inoculated sludge to be 5000-12000 mg/L, the abundance of functional flora to be higher than 20%, and controlling the Dissolved Oxygen (DO) to be below 0.1 mg/L;
the synchronous nitrosation-anaerobic ammonia oxidation-denitrification (SNAD) steps are as follows: setting inoculated sludge containing Anammox bacteria (Anammox), Ammonia Oxidizing Bacteria (AOB) and heterotrophic denitrifying bacteria, controlling the abundance of Anammox population to be not less than 3%, the filling ratio of carrier filler to be 25-40%, and the specific surface area of filler to be 550-900 m2/m3The concentration of Mixed Liquid Volatile Suspended Solids (MLVSS) is 3000-5000 mg/L, DO is controlled to be 0.1-0.5 mg/L, the temperature is 30-37 ℃, and free ammonia is controlled to be below 20 mg/L;
the short-range sulfur autotrophic denitrification-anaerobic ammonia oxidation (SSuDA) comprises the following steps: setting inoculated sludge containing Anamox bacteria and sulfur autotrophic denitrifying bacteria, taking sulfur as a sulfur source, wherein the ratio of sulfur to sodium carbonate is 0.4-0.6: 1, the ammonia nitrogen in effluent water is 50-100 mg/L and the nitrate nitrogen is 150-250 mg/L according to the steps of synchronous nitrosation-anaerobic ammonia oxidation-denitrification, determining the adding concentration of sulfur to be 200-500 g/L, the filling ratio of the filled carriers is 20-30%, and the specific surface area of the filler is 650-750 m2/m3Mixed solution MLVSS is 3000-5000 mg/L, temperature is 33-40 ℃, and DO is controlled below 0.1 mg/L; final effluent quality NH4 +controlling-N within 5mg/L, total nitrogen concentration TN within 10mg/L and COD concentration within 150-300 mg/L.
Further, the total residence time of the four steps is 51-136 hours, the coagulation sedimentation reaction residence time is controlled to be 3-4 hours, the anaerobic hydrolysis reaction residence time is controlled to be 12-48 hours, the synchronous nitrosation-anaerobic ammoxidation-denitrification reaction residence time is controlled to be 24-48 hours, and the short-cut sulfur autotrophic denitrification-anaerobic ammoxidation reaction residence time is controlled to be 12-36 hours, wherein the total residence time can be adjusted according to specific application conditions.
Further, the coagulating sedimentation step is implemented in a coagulating sedimentation system, the coagulating sedimentation system comprises a coagulating stirring tank, a dosing tank a, a dosing tank b and a sedimentation tank a, Polyacrylamide (PAM) is contained in the dosing tank a, polyaluminium chloride (PAC) is contained in the dosing tank b, the PAM and the PAC respectively enter the coagulating stirring tank through a dosing pump a and a dosing pump b, effluent of the coagulating stirring tank enters the sedimentation tank a for mud-water separation, and sludge in a sludge bucket is removed every day.
Furthermore, the anaerobic hydrolysis step is implemented in an anaerobic hydrolysis system, the anaerobic hydrolysis system comprises a water inlet pump and an anaerobic hydrolysis reaction tank, the effluent of the sedimentation tank a is sent into the anaerobic hydrolysis reaction tank through the water inlet pump, and the top of the anaerobic hydrolysis reaction tank is provided with a gas outlet and a sampling port, so that the monitoring and the adjustment are facilitated.
Furthermore, the anaerobic hydrolysis reaction tank ensures that a safe height is reserved between the mud layer and the water outlet by controlling the stirring speed, and a three-phase separator is arranged at the water outlet to ensure the clarification of the outlet water.
Furthermore, the synchronous nitrosation-anaerobic ammonia oxidation-denitrification step is implemented in a synchronous system, the synchronous system comprises an SNAD reaction tank, a flow meter, an aeration pump, a sedimentation tank b and a sludge reflux pump a, effluent of the anaerobic hydrolysis reaction tank enters the SNAD reaction tank, effluent of the SNAD reaction tank enters the sedimentation tank b for sludge-water separation, sludge enters a sludge hopper and returns to the SNAD reaction tank through the sludge reflux pump a, and the lower part of the SNAD reaction tank is connected with the aeration pump through the flow meter.
Furthermore, the air pumped by the aeration pump is regulated and controlled through a flow meter to maintain the concentration of dissolved oxygen in the SNAD reaction tank, so that internal microorganisms are in a micro-aeration environment to ensure that most of total nitrogen is removed; the remaining part of ammonia nitrogen is used for maintaining the concentration of free ammonia FA in the SNAD reaction tank, so that nitrite oxidizing bacteria NOB are inhibited without interfering main strains, and the degradation efficiency of total nitrogen and the stability of the strains in the reactor are ensured.
Furthermore, the short-range sulfur autotrophic denitrification-anaerobic ammonia oxidation step is implemented in a short-range system, the short-range system comprises a reactor, a sedimentation tank c, a sludge reflux pump b and a dosing tank c, effluent of the sedimentation tank b enters the reactor, effluent of the reactor enters the sedimentation tank c for sludge-water separation, and sludge enters a sludge hopper and returns to the reactor through the sludge reflux pump b; the adding amount of the mixed solution of sulfur and sodium carbonate in the dosing pool c is adjusted through a dosing pump c to control nitrate nitrogen to be reduced into nitrite nitrogen instead of being completely reduced into nitrogen, and then the mixed solution and ammonia nitrogen in the effluent of the sedimentation pool b are subjected to anaerobic ammonia oxidation reaction, so that the purposes of deep denitrification and reduction of medicament consumption are achieved.
Furthermore, the top of the SNAD reaction tank and the top of the reactor are provided with an exhaust port and a sampling port;
as a further step, the sedimentation tank b and the sedimentation tank c are both provided with a mud scraper, the mud scraper operates intermittently, and operates for 5 minutes every 6 hours, so that the effluent is still clear while the sludge on the wall of the sedimentation tank is cleared; the bottom slopes of the sedimentation tank b and the sedimentation tank c are set to be 50-70 degrees, so that as much sludge as possible slides into the mud bucket and flows back into the SNAD reaction tank and the reactor.
As a further step, the water content of the mixed liquid of the sulfur and the sodium carbonate which is mixed by adding water in the medicine adding pool c is 10 to 15 percent; according to the method, the nitrate nitrogen concentration and the ammonia nitrogen concentration in the effluent of the SNAD reaction tank are adjusted, under the condition that all nitrate nitrogen is reduced into nitrite nitrogen and all ammonia nitrogen participates in the anaerobic ammonia oxidation reaction, the nitrite nitrogen which does not participate in the anaerobic ammonia oxidation reaction is reduced into nitrogen by the residual sulfur, and the high-efficiency degradation of the total nitrogen by the whole device is ensured.
Compared with the prior art, the technical scheme adopted by the invention has the advantages that:
(1) the method removes high-concentration ammonia nitrogen and COD contained in the pig-raising wastewater through the coagulating sedimentation, the anaerobic hydrolysis, the SNAD process and the SSuDA process, and each system has a simple structure, high automation degree and strong operability.
(2) According to the invention, the aeration amount is controlled in the SNAD reactor to ensure that Free Ammonia (FA) with a certain concentration exists in the system, so that the activity of nitrite nitrogen oxidizing bacteria in the system is effectively inhibited, more ammonia nitrogen is converted into nitrite nitrogen and finally converted into nitrogen by anaerobic ammonia oxidizing bacteria to be removed, the total nitrogen removal efficiency of the system is greatly improved, and the aeration energy consumption is saved.
(3) The invention combines the short-range sulfur autotrophic denitrification with the anaerobic ammonia oxidation process, firstly maintains the anaerobic environment in the system to ensure that ammonia nitrogen is not oxidized, controls the addition amount of sulfur, and ensures that all nitrate nitrogen is reduced into nitrite nitrogen and carries out anaerobic ammonia oxidation with the ammonia nitrogen in the reactor. Because the anaerobic ammonia oxidation process can generate alkalinity, compared with the whole sulfur autotrophic denitrification process, the process can achieve the purposes of reducing the sulfur adding amount and saving the alkalinity consumption.
Drawings
FIG. 1 is a system structure diagram of anaerobic effluent high-efficiency denitrification and carbon removal of pig wastewater;
in the figure: 1, a coagulation stirring pool; 2, a dosing pool a; 3 a dosing pump a; 4 a dosing pump b; 5, a medicine adding pool b; 6, a sedimentation tank a; 7, a water inlet pump; 8, an anaerobic hydrolysis reaction tank; 9, a SNAD reaction pool; 10 a flow meter; 11 an aeration pump; 12 a sedimentation tank b; 113 sludge recirculation pump a; 14 a reactor; 15 a sedimentation tank c; 16 sludge reflux pump b; 17 a dosing tank c; 18 dosing pump c.
Detailed Description
The embodiments of the present invention are implemented on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are given, but the scope of the present invention is not limited to the following embodiments.
Example 1
The invention provides a method for efficiently denitrifying and decarbonizing anaerobic effluent of pig wastewater, which is implemented in a pig wastewater treatment device, wherein the pig wastewater treatment device comprises a coagulating sedimentation system, an anaerobic hydrolysis system, a synchronous system and a short-range system;
the coagulating sedimentation system comprises a coagulating stirring tank, a dosing pump and a sedimentation tank; PAM (polyacrylamide) and PAC (polyaluminium chloride) in the water inlet and dosing tank are fully mixed in the coagulation stirring tank and then stand in the sedimentation tank, the water outlet is connected with the anaerobic hydrolysis system, and sludge is periodically discharged from the sedimentation tank.
The anaerobic hydrolysis system comprises a water inlet pump and an anaerobic hydrolysis reaction tank; the anaerobic hydrolysis reaction tank is provided with a sewage inlet at the lower part, an air outlet and a sampling port at the top, and a three-phase separator is arranged at the water outlet; reacting the sewage in an anaerobic hydrolysis reaction tank to consume organic nitrogen and partial COD in the sewage; the water outlet of the anaerobic hydrolysis reaction tank is connected with the water inlet at the lower part of the SNAD reaction tank of the synchronous system through a pipeline;
the synchronous system comprises an SNAD reaction tank, a flowmeter, an aeration pump, a sedimentation tank and a sludge reflux pump; the lower part of the SNAD reaction tank is provided with a water inlet and an aeration system, the upper part of the SNAD reaction tank is provided with a water outlet, and the water inlet is connected with a sludge reflux pump and the water outlet of the anaerobic hydrolysis reaction tank; the SNAD reaction tank is internally loaded with filler and activated sludge; the aeration system comprises a flowmeter, an aeration pump and an aeration head, wherein the aeration head is connected with the aeration pump through the flowmeter and is used for providing oxygen for the activated sludge in the SNAD reaction tank; the water outlet is connected with the sedimentation tank through a pipeline, and a sludge discharge port of the sedimentation tank is connected with the water inlet of the SNAD reactor through a sludge reflux pump.
The short-range system comprises a reactor, a sedimentation tank, a sludge reflux pump, a dosing tank and a dosing pump; the water inlet of the reactor is connected with a sedimentation tank of the synchronous system and a sludge reflux pump of the self-system, the reactor is loaded with filler and activated sludge, sulfur serving as a sulfur source and sodium carbonate providing alkalinity are pumped into the reactor in a dosing tank through a dosing pump, and effluent can be directly discharged;
the filling amount of the biological filler in the SNAD reaction tank and the reactor is 20-40% of the total volume of the SNAD reaction tank and the reactor. The main component of the biological filler is plastic with the model K1, and the surface of the biological filler is provided with an anaerobic ammonia oxidation biological film growing on the biological filler.
The activated sludge filled in the SNAD reaction tank is nitrosobacteria, heterotrophic denitrifying bacteria and anaerobic ammonium oxidation bacteria. The activated sludge filled in the reactor is sulfur autotrophic denitrifying bacteria and anaerobic ammonium oxidation bacteria. The anaerobic hydrolysis reaction tank 6 contains anaerobic hydrolysis bacteria.
A method for efficiently denitrifying and decarbonizing anaerobic effluent of pig wastewater specifically comprises the following steps: carrying out a hydrolysis acidification process on incoming water in an anaerobic hydrolysis reaction tank after coagulating sedimentation, and removing most organic nitrogen and COD; removing about 80% of total nitrogen in the SNAD reaction tank by an SNAD process, and maintaining a certain ammonia nitrogen concentration to ensure that 5-20 mg/L of FA (free ammonia) exists in the SNAD reaction tank to inhibit the activity of nitrobacteria, so that less nitrogen is converted into nitrate nitrogen; and finally, in a reactor of the short-range system, controlling the addition amount of sulfur by utilizing the characteristic that the sulfur autotrophic denitrifying bacteria preferentially react with nitrate nitrogen, converting all nitrate nitrogen into nitrite nitrogen, and then performing anaerobic ammonia oxidation with ammonia nitrogen contained in the effluent of the SNAD reaction tank to finish the treatment process of total nitrogen.
The method for treating the pig raising wastewater comprises the following specific implementation cases:
the quality of sewage generated after daily cleaning of a pigsty in a certain pig farm is 1-2 months after the sewage is stored: NH (NH)4 +About 700-800 mg/L of-N and about 1200mg/L of COD. The process adopts a coupling process of synchronous nitrosation-anaerobic ammonia oxidation (SNAD) and short-range sulfur autotrophic denitrification-anaerobic ammonia oxidation, the hydraulic retention time is 48h, and the effluent NH is4 +-N lower than 10mg/L, NO2--N is less than 1mg/L, NO3--N is less than 1mg/L, NH4 +The average removal rate of-N and TN can reach 99%, and the average removal rate of COD is 80.1%.
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (10)
1. A method for efficiently denitrifying and decarbonizing anaerobic effluent of pig wastewater is characterized by comprising a coagulating sedimentation step, an anaerobic hydrolysis step, a synchronous nitrosation-anaerobic ammonia oxidation-denitrification step and a short-range sulfur autotrophic denitrification-anaerobic ammonia oxidation step;
the coagulating sedimentation step comprises the following steps: adding 1-5 mg/L of polyaluminum chloride (PAC), stirring at the rotating speed of 50-200 r/min for 20-30 min, then adding 0.8-1.2mg/L of Polyacrylamide (PAM), and stirring at the rotating speed of 90-110r/min for 20-30 min;
the anaerobic hydrolysis step comprises the following steps: setting the concentration of inoculated sludge to be 5000-12000 mg/L, the abundance of functional flora to be higher than 20%, and controlling the dissolved oxygen to be below 0.1 mg/L;
the synchronous nitrosation-anaerobic ammonia oxidation-denitrification step comprises the following steps: setting inoculated sludge containing anaerobic ammonium oxidation bacteria (Anammox), nitrosobacteria (AOB) and heterotrophic denitrifying bacteria, controlling the abundance of Anammox flora to be not less than 3%, the filling ratio of carrier filler to be 25-40%, and the specific surface area of filler to be 550-900 m2/m3The concentration of Mixed Liquid Volatile Suspended Solids (MLVSS) is 3000-5000 mg/L, the dissolved oxygen is controlled at 0.1-0.5 mg/L, the temperature is 30-37 ℃, and the free ammonia is controlled below 20 mg/L;
the short-range sulfur autotrophic denitrification-anaerobic ammonia oxidation (SSuDA for short) comprises the following steps: setting inoculated sludge containing Anammox bacteria and sulfur autotrophic denitrifying bacteria, taking sulfur as an electron donor, wherein the ratio of sulfur to sodium carbonate is 0.4-0.6: 1, the ammonia nitrogen in effluent water is 50-100 mg/L and the nitrate nitrogen is 150-250 mg/L according to the steps of synchronous nitrosation-anaerobic ammonia oxidation-denitrification, determining the adding concentration of sulfur to be 200-500 mg/L, the filling ratio of the filled carriers is 20-30%, and the specific surface area of the filler is 650-750 m2/m3The mixed liquid MLVSS is 3000-5000 mg/L, the temperature is 33-40 ℃, and the dissolved oxygen is controlled below 0.1 mg/L; final effluent quality ammonia Nitrogen (NH)4 +-N) concentration is controlled to be less than 5mg/L, total nitrogen concentration TN is controlled to be less than 10mg/L, and COD concentration is controlled to be 150-300 mg/L.
2. The method for efficiently denitrifying and decarbonizing the anaerobic effluent of the pig wastewater according to claim 1, which is characterized in that the total retention time of the four steps is 51-136 h, the retention time of the coagulation-precipitation reaction is controlled to be 3-4 h, the retention time of the anaerobic hydrolysis reaction is controlled to be 12-48 h, the retention time of SNAD is controlled to be 24-48 h, and the retention time of SSuDA is controlled to be 12-36 h.
3. The method for efficiently denitrifying and decarbonizing the anaerobic effluent of the pig wastewater according to claim 1, wherein the coagulating sedimentation step is implemented in a coagulating sedimentation system, the coagulating sedimentation system comprises a coagulating stirring tank, a dosing tank a, a dosing tank b and a sedimentation tank a, PAM is contained in the dosing tank a, PAC is contained in the dosing tank b, the PAM and the PAC enter the coagulating stirring tank through a dosing pump a and a dosing pump b respectively, the effluent of the coagulating stirring tank enters the sedimentation tank a for mud-water separation, and sludge in a sludge bucket is removed every day.
4. The method for efficiently denitrifying and decarbonizing the anaerobic effluent of the pig wastewater according to claim 1, wherein the anaerobic hydrolysis step is implemented in an anaerobic hydrolysis system, the anaerobic hydrolysis system comprises a water inlet pump and an anaerobic hydrolysis reaction tank, the effluent of the sedimentation tank a is fed into the anaerobic hydrolysis reaction tank through the water inlet pump, and an air outlet and a sampling port are arranged at the top of the anaerobic hydrolysis reaction tank.
5. The method for efficiently denitrifying and decarbonizing the anaerobic effluent of the pig wastewater as claimed in claim 4, wherein the anaerobic hydrolysis reaction tank ensures that a safe height is reserved between a mud layer and the water outlet by controlling the stirring speed, and a three-phase separator is arranged at the water outlet.
6. The method for efficiently denitrifying and decarbonizing the anaerobic effluent of the pig wastewater according to claim 1, wherein the synchronous nitrosation-anaerobic ammoxidation-denitrification step is implemented in a synchronous system, the synchronous system comprises an SNAD reaction tank, a flow meter, an aeration pump, a sedimentation tank b and a sludge reflux pump a, the effluent of the anaerobic hydrolysis reaction tank enters the SNAD reaction tank, the effluent of the SNAD reaction tank enters the sedimentation tank b for sludge-water separation, the sludge enters a sludge hopper and returns to the SNAD reaction tank through the sludge reflux pump a, and the lower part of the SNAD reaction tank is connected with the aeration pump through the flow meter.
7. The method for efficiently denitrifying and decarbonizing the anaerobic effluent of the pig wastewater according to claim 6, characterized in that the flow rate of the air pumped by the aeration pump is regulated by a flow meter to maintain the dissolved oxygen concentration in the SNAD reaction tank, so that the internal microorganisms are in a micro-aeration environment to ensure that most of the total nitrogen is removed; the remaining part of ammonia nitrogen is used for maintaining the concentration of Free Ammonia (FA) in the SNAD reaction tank, so as to inhibit Nitrite Oxidizing Bacteria (NOB) without interfering main strains.
8. The method for efficiently denitrifying and decarbonizing the anaerobic effluent of the pig wastewater according to the claim 1, wherein the step of the short-range sulfur autotrophic denitrification-anaerobic ammonia oxidation is implemented in a short-range system, the short-range system comprises a reactor, a sedimentation tank c, a sludge reflux pump b and a dosing tank c, the effluent of the sedimentation tank b enters the reactor, the effluent of the reactor enters the sedimentation tank c for sludge-water separation, and the sludge enters a sludge hopper and returns to the reactor through the sludge reflux pump b; the adding amount of the mixed solution of sulfur and sodium carbonate in the dosing pool c is adjusted through the dosing pump c to control nitrate nitrogen to be reduced into nitrite nitrogen instead of being completely reduced into nitrogen, and then the mixed solution and ammonia nitrogen in the water discharged from the sedimentation pool b are subjected to anaerobic ammonia oxidation reaction, so that the purposes of deep denitrification and reduction of medicament consumption are achieved.
9. The method for efficiently denitrifying and decarbonizing the anaerobic effluent of the pig wastewater according to claim 6, wherein the settling pond b and the settling pond c are both provided with mud scrapers, the mud scrapers operate intermittently, and the operation lasts for 5 minutes every 6 hours, so that the effluent is clear while the sludge on the wall of the settling pond is cleared; the bottom slopes of the sedimentation tank b and the sedimentation tank c are set to be 50-70 degrees so as to ensure that as much sludge as possible slides into the mud bucket and flows back into the SNAD reaction tank and the reactor.
10. The method for efficiently denitrifying and decarbonizing the anaerobic effluent of the pig wastewater according to claim 8, wherein the mixed solution of sulfur and sodium carbonate added with water and mixed in the dosing pool c has a solid content of 10% to 15%; adjusting according to the nitrate nitrogen concentration and the ammonia nitrogen concentration in the effluent of the SNAD reaction tank, and reducing all nitrate nitrogen into nitrite nitrogen and all ammonia nitrogen into nitrogen gas under the condition of ensuring that all ammonia nitrogen is reduced into nitrite nitrogen and all ammonia nitrogen is involved in the anaerobic ammonia oxidation reaction, wherein nitrite nitrogen which is not involved in the anaerobic ammonia oxidation reaction is reduced into nitrogen gas by the residual sulfur, so as to ensure the high-efficiency degradation of total nitrogen.
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