CN114634244A - Methane fermentation coupling integrated denitrification system and process for livestock and poultry manure wastewater - Google Patents
Methane fermentation coupling integrated denitrification system and process for livestock and poultry manure wastewater Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
- C02F3/286—Anaerobic digestion processes including two or more steps
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
- C02F3/2866—Particular arrangements for anaerobic reactors
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
- C02F3/2866—Particular arrangements for anaerobic reactors
- C02F3/2893—Particular arrangements for anaerobic reactors with biogas recycling
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/20—Nature of the water, waste water, sewage or sludge to be treated from animal husbandry
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
Abstract
The invention provides a methane fermentation and coupling integrated denitrification system for livestock and poultry manure wastewater and a process thereof. The membrane water outlet at the top end of the methane fermentation reactor is communicated with an adjusting tank, the adjusting tank is communicated with a denitrification reactor, the denitrification reactor is communicated with an SNAP reactor, and the SNAP reactor is communicated with a PD-A deep denitrification reactor. The digestive juice of the methane fermentation reactor flows into the SNAP reactor to realize high-efficiency and stable denitrification; nitrate nitrogen in the SNAP effluent flows back to the denitrification reactor for denitrification and then is further removed in the SNAP reactor, so that the residue of the nitrate nitrogen in the effluent of the SNAP reactor is reduced; the residual nitrogen in the SNAP effluent is deeply denitrified by the PD-A reactor. The coupling process finally realizes the deep and efficient treatment of organic matters and nitrogen. The invention only needs a small amount of aeration, and has the characteristics of energy conservation, consumption reduction, less sludge production, high denitrification efficiency, stable treatment efficiency and high effluent quality.
Description
Technical Field
The invention belongs to the technical field of livestock and poultry manure wastewater treatment, and particularly relates to a livestock and poultry manure wastewater methane fermentation coupling integrated denitrification system and a process thereof.
Background
Intensive livestock and poultry farms develop rapidly and scale up continuously, and generate a large amount of livestock and poultry breeding wastewater consisting of livestock and poultry manure, urine, flushing wastewater and the like. The treatment of pig farm breeding wastewater becomes the focus of pollution control in rural areas in China at present. Anaerobic fermentation has become a mainstream treatment process for wastewater of livestock and poultry farms because the anaerobic fermentation can degrade pollutants and generate green energy, namely methane. In the anaerobic fermentation tank, although the complex flora can convert organic matters in the livestock and poultry breeding wastewater into methane through anaerobic digestion, a large amount of anaerobic digestion solution still containing high-concentration ammonia nitrogen, phosphate and other nutrient substances is generated, and the direct discharge not only can damage the surrounding environment, but also can cause the waste of nutrient salts.
By adopting the traditional sewage treatment processes such as an activated sludge process and the like, the treatment effect on the livestock and poultry manure wastewater with high organic matters, high ammonia nitrogen and high suspended matters is poor, the effluent ammonia nitrogen often cannot reach the discharge standard of pollutants for livestock and poultry breeding (GB18596-2001), the process has large floor area and high treatment cost and operation cost, and the actual engineering problem is difficult to solve.
Disclosure of Invention
The invention aims to solve the technical problem of providing a livestock and poultry manure wastewater methane fermentation coupling integrated denitrification system and a process thereof aiming at the defects of the prior art so as to solve the problems in the background technology.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a methane fermentation coupling integrated denitrification system for livestock and poultry manure wastewater comprises a methane fermentation reactor, a regulating reservoir, a denitrification reactor, an SNAP reactor and a PD-A deep denitrification reactor;
the methane fermentation reactor is communicated with a grid tank, and the grid tank is used for removing suspended matters in the livestock and poultry sewage to be treated;
the membrane water outlet at the top end of the methane fermentation reactor is communicated with an adjusting tank, and the adjusting tank is used for performing buffer adjustment on water quantity and water quality on membrane effluent of the methane fermentation reactor;
the regulating tank is communicated with a denitrification reactor, and nitrate nitrogen in the denitrification reactor is subjected to denitrification by utilizing COD in the effluent of the regulating tank;
the denitrification reactor is communicated with the SNAP reactor, after overflow liquid of the denitrification reactor flows into the SNAP reactor and part of ammonia nitrogen in the SNAP reactor is oxidized into nitrite nitrogen, the residual ammonia nitrogen in the SNAP reactor and nitrite nitrogen are subjected to anaerobic ammonia oxidation reaction, and efficient denitrification is realized;
the SNAP reactor is communicated with a PD-A deep denitrification reactor, residual ammonia nitrogen and nitrite nitrogen in the PD-A deep denitrification reactor realize a deep denitrification function through anaerobic ammonia oxidation, and then the residual ammonia nitrogen and the nitrite nitrogen are discharged.
Furthermore, a grid belt is rotatably connected in the grid tank and used for removing suspended matters in the grid tank.
Furthermore, the bottom end of the methane fermentation reactor is communicated with a sludge discharge pipe, and the sludge discharge pipe is used for composting after dehydration treatment.
Further, the denitrification reactor is specifically a filler type denitrification reactor.
Furthermore, the adjusting tank is also connected with a communicating pipe for supplementing organic matters to the feeding pipe of the PD-A deep denitrification reactor.
Furthermore, the SNAP reactor is also connected with a return pipe for returning to the denitrification reactor.
A process of a livestock and poultry manure wastewater methane fermentation and coupled denitrification system comprises the following steps:
s1, passing the livestock and poultry manure wastewater to be treated through a grid pond, and removing a large amount of suspended matters in the livestock and poultry manure wastewater through the grid pond;
s2, allowing the sewage to flow into a methane fermentation reactor for anaerobic fermentation, converting most COD in the livestock and poultry manure wastewater into methane, and circulating the generated methane to the methane fermentation reactor to blow off the surface of the membrane so as to prevent the membrane from being blocked;
s3, communicating a membrane water outlet treated by the methane fermentation reactor with an adjusting tank, allowing the membrane water outlet to flow into the adjusting tank for buffer adjustment of water quantity and water quality, communicating a sludge discharge pipe at the bottom of the methane fermentation reactor, and dehydrating the sludge for composting;
s4, making the effluent of the regulating reservoir flow into a filler type denitrification reactor, and denitrifying the nitrate nitrogen in the denitrification reactor by using COD (chemical oxygen demand) in the effluent of the regulating reservoir;
s5, enabling overflow liquid of the denitrification reactor to flow into the SNAP reactor, and after part of ammonia nitrogen in the SNAP reactor is oxidized into nitrite nitrogen, carrying out anaerobic ammonia oxidation reaction on the residual ammonia nitrogen and the nitrite nitrogen in the SNAP reactor to realize efficient denitrification;
s6, the effluent of the SNAP reactor flows into a PD-A deep denitrification reactor, the residual ammonia nitrogen and nitrite nitrogen realize the deep denitrification function in the PD-A deep denitrification reactor through anaerobic ammonia oxidation, and part of water drained from the regulating tank is used as the supplement of a carbon source and the ammonia nitrogen in the denitrification process to finish the treatment.
Compared with the prior art, the invention has the following advantages:
the invention arranges the methane fermentation reactor, the adjusting tank, the denitrification reactor, the SNAP reactor and the PD-A deep denitrification reactor, and communicates the reactors in sequence, when in use, anaerobic biological treatment is adopted, compared with the traditional aerobic process, the invention has the characteristics of energy saving and consumption reduction, and the comparative calculation of process operation shows that 1m is treated3The energy consumption of the pig manure wastewater is 2.54-4.48 kW.h, which is far lower than that of 3.20-6.40 kW.h of the traditional process; because the sludge yield in the anaerobic biological treatment is small, 1m is calculated and treated3The mud yield (kW.h) of the pig manure wastewater is 0.164-0.327, which is far lower than that of the traditional process by 1.24-2.28 kW.h; in the methane fermentation reaction of the main COD removing unit, the treatment efficiency is stable, the effluent quality is high, the methane recovery rate is high, and subsequent treatment is not needed. Residual COD in the effluent is utilized as a carbon source of a subsequent denitrification treatment unit, so that denitrification is realized, and COD is further removed, so that the treatment efficiency of the COD is high and reaches 95-96%; in the denitrification process: the denitrification reactor 5 reduces the C/N of the inlet water and improves the denitrification efficiency; the water inlet with low C/N is low, and the SNAP reactor efficiently and stably denitrifies the water; realization of rich NO by PD-A process3 --advanced treatment of N wastewater;the deep and efficient treatment of organic matters and nitrogen is realized, and the TN treatment efficiency is 90-95 percent and is higher than that of the traditional process by 7-8 percent.
Drawings
Fig. 1 is an overall schematic of the present invention.
1-a grating pool; 2-a methane fermentation reactor; 3-dewatering pool; 4-a regulating tank; 5-a denitrification reactor; 6-SNAP reactor; 7-PD-A deep denitrification reactor.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
the methane fermentation reactor 2 is communicated with a grid pool 1, and a grid belt is rotationally connected in the grid pool 1 and used for removing suspended matters in the grid pool 1.
And a membrane water outlet at the top end of the methane fermentation reactor 2 is communicated with an adjusting tank 4, and the adjusting tank 4 is used for buffering and adjusting the water quantity and the water quality of membrane effluent of the methane fermentation reactor 2.
The bottom end of the methane fermentation reactor 2 is communicated with a dewatering tank 3, and the dewatering tank 3 is used for dewatering solid impurities and then discharging the solid impurities for composting.
The adjusting tank 4 is communicated with a denitrification reactor 5, the denitrification reactor 2 is specifically a filler type denitrification reactor, and nitrate nitrogen in the denitrification reactor 5 utilizes COD in the effluent of the adjusting tank to carry out denitrification.
The denitrification reactor 5 is communicated with the SNAP reactor 6, after the overflow liquid of the denitrification reactor 5 flows into the SNAP reactor 6 and part of ammonia nitrogen in the SNAP reactor 6 is oxidized into nitrite nitrogen, the residual ammonia nitrogen in the SNAP reactor 6 and the nitrite nitrogen are subjected to anaerobic ammonia oxidation reaction, and efficient denitrification is realized.
In order to facilitate the repeated treatment, a return pipe for returning to the denitrification reactor 5 is also connected to the SNAP reactor 6.
The SNAP reactor 6 is communicated with a PD-A deep denitrification reactor 7, the regulating reservoir 4 is also connected with a communicating pipe for supplementing organic matters to a feeding pipe of the PD-A deep denitrification reactor 7, and residual ammonia nitrogen and nitrite nitrogen in the PD-A deep denitrification reactor 7 realize a deep denitrification function through anaerobic ammonia oxidation and then are discharged.
Example 2, the process of the livestock and poultry manure wastewater methane fermentation coupled integrated denitrification system in example 1 includes the following steps:
s1, the livestock and poultry manure wastewater to be treated firstly passes through the grid pool 1, and a large amount of suspended matters in the livestock and poultry manure wastewater are removed through the grid pool 1;
s2, flowing into the methane fermentation reactor 2 for anaerobic fermentation, converting most COD in the livestock and poultry manure wastewater into methane, circulating the generated biogas to the methane fermentation reactor 2 for stripping the membrane surface, and preventing the membrane from being blocked;
s3, a membrane water outlet treated by the methane fermentation reactor 2 is communicated with a regulating tank 4, the membrane water flows into the regulating tank 4 to buffer and regulate water quantity and water quality, solid impurities at the bottom of the methane fermentation reactor 2 flow to a dehydration tank 3, the dehydration tank 3 dehydrates the solid impurities and then discharges the solid impurities to carry out composting treatment;
s4, making the effluent of the regulating reservoir 4 flow into a filler type denitrification reactor 5, and carrying out denitrification treatment on the nitrate nitrogen in the denitrification reactor 5 by utilizing COD (chemical oxygen demand) in the effluent of the regulating reservoir 4;
s5, enabling overflow liquid of the denitrification reactor 5 to flow into the SNAP reactor 6, and after part of ammonia nitrogen in the SNAP reactor 6 is oxidized into nitrite nitrogen, carrying out anaerobic ammonia oxidation reaction on the residual ammonia nitrogen and the nitrite nitrogen in the SNAP reactor 6 to realize efficient denitrification;
s6, enabling the effluent of the SNAP reactor 6 to flow into the PD-A deep denitrification reactor 7, realizing the deep denitrification function of the residual ammonia nitrogen and nitrite nitrogen in the PD-A deep denitrification reactor 7 through anaerobic ammonia oxidation, and supplementing a carbon source and the ammonia nitrogen in the denitrification process by using part of water drained from the regulating reservoir 4 to finish the treatment.
In the specific using process, anaerobic biological treatment is adopted, so that the process has the characteristics of energy conservation and consumption reduction compared with the traditional aerobic process, and the comparison calculation of process operation shows that 1m is treated3The energy consumption of the pig manure wastewater is 2.54-4.48 kW.h, which is far lower than that of 3.20-6.40 kW.h of the traditional process; because the sludge yield in the anaerobic biological treatment is small, 1m is calculated and treated3The mud yield (kW.h) of the pig manure wastewater is 0.164-0.327, which is far lower than that of the traditional process, namely 1.24-2.28 kW.h.
In the methane fermentation reaction of the main COD removing unit, the treatment efficiency is stable, the effluent quality is high, the methane recovery rate is high, and subsequent treatment is not needed. Residual COD in the effluent is used as a carbon source of a subsequent denitrification treatment unit, so that denitrification is realized, and COD is further removed, so that the treatment efficiency of the COD is high and reaches 95-96%.
In the denitrification process: the denitrification reactor 5 reduces the C/N of the inlet water and improves the denitrification efficiency; the SNAP reactor 6 efficiently and stably denitrifies water with low C/N water inlet; realization of rich NO by PD-A process3 --advanced treatment of N wastewater; the deep and efficient treatment of organic matters and nitrogen is realized, and the TN treatment efficiency is 90-95 percent and is higher than that of the traditional process by 7-8 percent.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A methane fermentation and coupling integrated denitrification system for livestock and poultry manure wastewater is characterized by comprising a methane fermentation reactor (2), a regulating pond (4), a denitrification reactor (5), an SNAP reactor (6) and a PD-A deep denitrification reactor (7);
the methane fermentation reactor (2) is communicated with a grid pool (1), and the grid pool (1) is used for removing suspended matters in the livestock and poultry sewage to be treated;
a membrane water outlet at the top end of the methane fermentation reactor (2) is communicated with an adjusting tank (4), and the adjusting tank (4) is used for buffering and adjusting the water quantity and the water quality of membrane effluent of the methane fermentation reactor (2);
the regulating tank (4) is communicated with a denitrification reactor (5), and nitrate nitrogen in the denitrification reactor (5) utilizes COD in the effluent of the regulating tank to carry out denitrification;
the denitrification reactor (5) is communicated with the SNAP reactor (6), after overflow liquid of the denitrification reactor (5) flows into the SNAP reactor (6), after partial ammonia nitrogen in the SNAP reactor (6) is oxidized into nitrite nitrogen, the residual ammonia nitrogen in the SNAP reactor (6) and the nitrite nitrogen are subjected to anaerobic ammonia oxidation reaction, and efficient denitrification is realized;
the SNAP reactor (6) is communicated with a PD-A deep denitrification reactor (7), residual ammonia nitrogen and nitrite nitrogen in the PD-A deep denitrification reactor (7) realize a deep denitrification function through anaerobic ammonia oxidation and then are discharged.
2. The methane fermentation and coupling integrated denitrification system for livestock and poultry manure wastewater as claimed in claim 1, wherein a grid belt is rotatably connected in the grid tank (1) and used for removing suspended matters in the grid tank (1).
3. The methane fermentation and coupling integrated denitrification system for livestock and poultry manure wastewater as claimed in claim 1, wherein a sludge discharge pipe (3) is communicated with the bottom end of the methane fermentation reactor (2), and the sludge is subjected to dehydration treatment and then composted to serve as an organic fertilizer.
4. The methane fermentation and coupling integrated denitrification system for livestock and poultry manure wastewater as claimed in claim 1, wherein the denitrification reactor (2) is a packed denitrification reactor.
5. The methane fermentation and coupling integrated denitrification system for livestock and poultry manure wastewater as claimed in claim 1, wherein a communicating pipe for supplementing organic matters to a feeding pipe of the PD-A deep denitrification reactor (7) is further connected to the adjusting tank (4).
6. The methane fermentation and coupling integrated denitrification system for livestock and poultry manure wastewater as claimed in claim 1, wherein a return pipe for returning to the denitrification reactor (5) is further connected to the SNAP reactor (6).
7. The process of methane fermentation and coupling integrated denitrification system for livestock and poultry manure wastewater as claimed in any one of claims 1-7, wherein the process comprises the following steps:
s1, the livestock and poultry manure wastewater to be treated firstly passes through the grid pool (1), and a large amount of suspended matters in the livestock and poultry manure wastewater are removed through the grid pool (1);
s2, flowing into a methane fermentation reactor (2) for anaerobic fermentation, converting most COD in the livestock and poultry manure wastewater into methane, and circulating the generated biogas to the methane fermentation reactor (2) for stripping the membrane surface to prevent the membrane from being blocked;
s3, a membrane water outlet processed by the methane fermentation reactor (2) is communicated with a regulating reservoir (4), the membrane water outlet flows into the regulating reservoir (4) to buffer and regulate water quantity and water quality, solid impurities at the bottom of the methane fermentation reactor (2) flow to a dewatering pool (3), the dewatering pool (3) dehydrates the solid impurities, and then the solid impurities are discharged to carry out composting;
s4, making the effluent of the regulating reservoir (4) flow into a filler type denitrification reactor (5), and performing denitrification treatment on nitrate nitrogen in the denitrification reactor (5) by utilizing COD (chemical oxygen demand) in the effluent of the regulating reservoir (4);
s5, enabling overflow liquid of the denitrification reactor (5) to flow into the SNAP reactor (6), and after part of ammonia nitrogen in the SNAP reactor (6) is oxidized into nitrite nitrogen, carrying out anaerobic ammonia oxidation reaction on the residual ammonia nitrogen and nitrite nitrogen in the SNAP reactor (6) to realize efficient denitrification;
s6, enabling the effluent of the SNAP reactor (6) to flow into the PD-A deep denitrification reactor (7), realizing the deep denitrification function of the residual ammonia nitrogen and nitrite nitrogen in the PD-A deep denitrification reactor (7) through anaerobic ammonia oxidation, and using part of water drained from the regulating tank (4) as a carbon source and ammonia nitrogen supplement in the denitrification process to finish the treatment.
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Cited By (1)
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| CN115611428A (en) * | 2022-11-04 | 2023-01-17 | 山东生态家园环保股份有限公司 | Anaerobic ammonia oxidation denitrification device suitable for breeding sewage |
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