CN114180719A - Fermentation wastewater treatment system and method for treating fermentation wastewater - Google Patents
Fermentation wastewater treatment system and method for treating fermentation wastewater Download PDFInfo
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- C02F3/00—Biological treatment of water, waste water, or sewage
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Abstract
The invention relates to a fermentation wastewater treatment system and a method for treating fermentation wastewater, and belongs to the field of water treatment. The fermentation wastewater treatment system comprises an anaerobic COD reactor for removing COD, a primary anaerobic ammonia oxidation reactor, a nitrosation reactor and a secondary anaerobic ammonia oxidation reactor; the water outlet of the anaerobic COD reactor is communicated with the water inlet of the primary anaerobic ammonia oxidation reactor through a second pipeline, the water outlet of the primary anaerobic ammonia oxidation reactor is communicated with the water inlet of the nitrosation reactor through a third pipeline, and the water outlet of the nitrosation reactor is communicated with the water inlet of the secondary anaerobic ammonia oxidation reactor through a fourth pipeline; the second pipeline is communicated with the fourth pipeline through a fifth pipeline, and the fourth pipeline is communicated with the second pipeline through the first pipeline. The whole biochemical process is combined to form the AAOA biochemical process flow, the sludge amount is small, and the methane yield is high: almost all COD is converted into methane instead of microorganisms, and the energy consumption is low.
Description
Technical Field
The invention relates to a fermentation wastewater treatment system and a method for treating fermentation wastewater, and belongs to the field of water treatment.
Background
In the fermentation industry, grains are mostly used as raw materials, and microorganisms are used as power to produce food through fermentation. However, besides the target products, the fermentation industry often produces a large amount of sewage, and the main pollutants are COD, nitrogen, phosphorus and the like. If discharged into the environment without treatment, the ecological environment is greatly damaged. At present, the treatment of waste water in the fermentation industry mainly adopts an anaerobic and aerobic combined method for COD treatment; the ammonia nitrogen and the total nitrogen are mainly treated by adopting nitrification and denitrification processes, and the treatment method has higher energy consumption and sludge yield.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: provides a fermentation wastewater treatment system with low sludge yield and low energy consumption and a method for treating fermentation wastewater.
The technical scheme adopted by the invention for solving the technical problems is as follows: the fermentation wastewater treatment system comprises an anaerobic COD reactor for removing COD, a primary anaerobic ammonia oxidation reactor, a nitrosation reactor and a secondary anaerobic ammonia oxidation reactor;
the water outlet of the anaerobic COD reactor is communicated with the water inlet of the primary anaerobic ammonia oxidation reactor through a second pipeline, the water outlet of the primary anaerobic ammonia oxidation reactor is communicated with the water inlet of the nitrosation reactor through a third pipeline, and the water outlet of the nitrosation reactor is communicated with the water inlet of the secondary anaerobic ammonia oxidation reactor through a fourth pipeline;
the second pipeline is communicated with the fourth pipeline through a fifth pipeline, and the fourth pipeline is communicated with the second pipeline through the first pipeline.
Further, the anaerobic COD reactor is any one of an anaerobic contact reactor, a UASB, an anaerobic baffled reactor, an EGSB, an anaerobic biological filter, an IC reactor and a horizontal flow anaerobic reactor.
Further, the primary anaerobic ammoxidation reactor is any one of an anaerobic contact reactor, a UASB (upflow anaerobic sludge blanket), an anaerobic baffled reactor, an EGSB (expanded granular sludge blanket), an anaerobic biofilter, an IC (integrated Circuit) reactor and a horizontal flow anaerobic reactor;
further, the secondary anaerobic ammoxidation reactor is any one of an anaerobic contact reactor, a UASB (upflow anaerobic sludge blanket), an anaerobic baffled reactor, an EGSB (expanded granular sludge blanket), an anaerobic biofilter, an IC (integrated Circuit) reactor and a horizontal flow anaerobic reactor.
Further, the nitrosation reactor is an activated sludge process aeration tank.
A method for treating fermentation wastewater, comprising the steps of:
s5: adding first anaerobic bacteria into an anaerobic COD reactor, wherein the first anaerobic bacteria contain first COD degrading bacteria, adding second anaerobic bacteria into a primary anaerobic ammonia oxidation reactor, wherein the second anaerobic bacteria contain first anaerobic ammonia oxidation bacteria and first denitrifying bacteria, adding aerobic bacteria into a nitrosation reactor, wherein the aerobic bacteria contain nitrite bacteria, and adding third anaerobic bacteria into a secondary anaerobic ammonia oxidation reactor, wherein the third anaerobic bacteria contain second anaerobic ammonia oxidation bacteria and second denitrifying bacteria;
s10: anaerobic COD reaction, namely introducing the pretreated fermentation wastewater into an anaerobic COD reactor for anaerobic COD reaction, and removing COD in the fermentation wastewater under the action of COD degrading bacteria;
s20: a first anaerobic ammonia oxidation reaction, namely introducing the fermentation wastewater subjected to the anaerobic COD reaction into a first anaerobic ammonia oxidation reactor 2 to perform a first anaerobic ammonia oxidation reaction;
s30: performing nitrosation reaction, namely introducing the fermentation wastewater subjected to the primary anaerobic ammoxidation reaction into a nitrosation reactor for nitrosation reaction;
s40: performing secondary anaerobic ammonia oxidation reaction, namely introducing the fermentation wastewater subjected to the nitrosation reaction into a secondary anaerobic ammonia oxidation reactor to perform secondary anaerobic ammonia oxidation reaction;
allowing a part of the fermentation wastewater subjected to the step S30 to enter a secondary anaerobic ammonia oxidation reactor, and allowing the other part of the fermentation wastewater to flow back to a second pipeline through a first pipeline to enter a primary anaerobic ammonia oxidation reactor;
and (4) allowing a part of the fermentation wastewater after the step S10 to enter the primary anaerobic ammonia oxidation reactor, and allowing the other part of the fermentation wastewater to be branched to the fourth pipeline through the fifth pipeline so as to enter the secondary anaerobic ammonia oxidation reactor.
Further, in step S20, NH4 +: NO 2-is 1: 1.32.
further, in step S40, NH4 +: NO 2-is 1: 1.32.
further, in step S5, the second anaerobic bacteria further include second COD degrading bacteria.
Further, in step S5, the third anaerobic bacteria further include third COD degrading bacteria.
Further, in step S10, the pretreatment includes filtering, precipitation and homogenization.
The invention has the beneficial effects that:
the fermentation wastewater treatment method has the advantages that: COD is removed by adopting a multi-stage anaerobic method without being assisted by aerobic treatment; meanwhile, different from the situation that the common anaerobic ammonia oxidation reaction is arranged behind the nitrosation reaction, the invention provides nitrite ions for the primary anaerobic ammonia oxidation by leading the primary anaerobic ammonia oxidation reaction and adopting the mode of effluent backflow of the nitrosation reaction, thereby simplifying the working procedures and further reducing the investment. And a two-stage anaerobic ammonia oxidation reaction process is adopted, ammonia nitrogen enters a primary anaerobic ammonia oxidation reaction and a secondary anaerobic ammonia oxidation reaction after nitrosation, and the nitrosation reaction only needs to provide a small amount of oxygen for the nitrosation reaction. The whole biochemical process is combined to form the AAOA biochemical process flow, the sludge amount is small, namely: only a very small amount of anaerobic sludge and nitrosation sludge are contained, and aerobic sludge is not contained; the biogas yield is high: almost all COD is converted into methane instead of microorganisms, and the energy consumption is low.
Drawings
FIG. 1 is a schematic view of a fermentation wastewater treatment system of the present invention;
FIG. 2 is a flow chart of the method for treating fermentation wastewater of the present invention.
Labeled as: 1 is an anaerobic COD reactor, 2 is a primary anaerobic ammonia oxidation reactor, 3 is a nitrosation reactor, 4 is a secondary anaerobic ammonia oxidation reactor, 51 is a first pipe, 52 is a second pipe, 53 is a third pipe, 54 is a fourth pipe, and 55 is a fifth pipe.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1, the fermentation wastewater treatment system comprises an anaerobic COD reactor 1 for removing COD, a primary anaerobic ammonium oxidation reactor 2, a nitrosation reactor 3, and a secondary anaerobic ammonium oxidation reactor 4;
the water outlet of the anaerobic COD reactor 1 is communicated with the water inlet of the primary anaerobic ammonia oxidation reactor 2 through a second pipeline 52, the water outlet of the primary anaerobic ammonia oxidation reactor 2 is communicated with the water inlet of the nitrosation reactor 3 through a third pipeline 53, and the water outlet of the nitrosation reactor 3 is communicated with the water inlet of the secondary anaerobic ammonia oxidation reactor 4 through a fourth pipeline 54;
the second duct 52 communicates with a fourth duct 54 through a fifth duct 55, and the fourth duct 54 communicates with the second duct 52 through the first duct 51.
Preferably, the anaerobic COD reactor 1 is any one of an anaerobic contact reactor, a UASB, an anaerobic baffled reactor, an EGSB, an anaerobic biofilter, an IC reactor, and a horizontal flow anaerobic reactor.
Preferably, the primary anaerobic ammoxidation reactor 2 is any one of an anaerobic contact reactor, a UASB, an anaerobic baffled reactor, an EGSB, an anaerobic biofilter, an IC reactor and a horizontal flow anaerobic reactor;
preferably, the secondary anaerobic ammoxidation reactor 4 is any one of an anaerobic contact reactor, a UASB, an anaerobic baffled reactor, an EGSB, an anaerobic biofilter, an IC reactor and a horizontal flow anaerobic reactor.
As shown in FIG. 1 and FIG. 2, the method for treating fermentation wastewater comprises the following steps:
s5: adding first anaerobic bacteria into an anaerobic COD reactor 1, wherein the first anaerobic bacteria contain first COD degrading bacteria, adding second anaerobic bacteria into a primary anaerobic ammonia oxidation reactor 2, wherein the second anaerobic bacteria contain first anaerobic ammonia oxidation bacteria and first denitrifying bacteria, adding aerobic bacteria into a nitrosation reactor 3, wherein the aerobic bacteria contain nitrite bacteria, and adding third anaerobic bacteria into a secondary anaerobic ammonia oxidation reactor 4, wherein the third anaerobic bacteria contain second anaerobic ammonia oxidation bacteria and second denitrifying bacteria;
s10: anaerobic COD reaction, namely introducing the pretreated fermentation wastewater into an anaerobic COD reactor 1 for anaerobic COD reaction, and removing COD in the fermentation wastewater under the action of COD degrading bacteria;
s20: a first anaerobic ammonia oxidation reaction, namely introducing the fermentation wastewater subjected to the anaerobic COD reaction into a first anaerobic ammonia oxidation reactor 2 to perform a first anaerobic ammonia oxidation reaction;
s30: performing nitrosation reaction, namely introducing the fermentation wastewater subjected to the primary anaerobic ammoxidation reaction into a nitrosation reactor 3 for nitrosation reaction;
s40: performing secondary anaerobic ammonium oxidation, namely introducing the fermentation wastewater subjected to the nitrosation reaction into a secondary anaerobic ammonium oxidation reactor 4 to perform secondary anaerobic ammonium oxidation;
a part of the fermentation wastewater after the step S30 enters the secondary anammox reactor 4, and the other part of the fermentation wastewater returns to the second pipeline 52 through the first pipeline 51 to enter the primary anammox reactor 2;
a part of the fermentation wastewater after the step S10 enters the primary anammox reactor 2, and the other part of the fermentation wastewater is branched to the fourth pipe 54 through the fifth pipe 55 to enter the secondary anammox reactor 4.
Preferably, in step S5, the second anaerobic bacteria further include a second COD degrading bacteria.
Preferably, in step S20, NH4 +: NO 2-is 1: 1.32.
preferably, in step S40, NH4 +: NO 2-is 1: 1.32.
preferably, the pretreatment in step S10 includes filtration, precipitation and homogenization.
The fermentation wastewater sequentially flows through anaerobic COD reaction, primary anaerobic ammonia oxidation reaction, nitrosation reaction and secondary anaerobic ammonia oxidation reaction, the first COD degrading bacteria, the second COD degrading bacteria and the third COD degrading bacteria comprise hydrolytic microorganisms, acidogenic microorganisms, acetogenic microorganisms and methanogenic microorganisms which can remove COD, and the second pipeline 52 is communicated with the fourth pipeline 54 through a fifth pipeline 55, namely: the water outlet of the anaerobic COD reactor 1 and the water inlet of the secondary anaerobic ammonia oxidation reactor 4 are bridged by a fifth pipeline 55, and part of anaerobic COD reaction effluent directly flows into the secondary anaerobic ammonia oxidation reaction by crossing the primary anaerobic ammonia oxidation reaction to provide ammonia ions for the secondary anaerobic ammonia oxidation reaction; meanwhile, the fourth duct 54 communicates with the second duct 52 through the first duct 51, that is: the water outlet of the nitrosation reactor 3 is connected with the water inlet of the anaerobic ammonia oxidation reactor 2 through a first pipeline 51, and part of nitrosation effluent flows back to enter the primary anaerobic ammonia oxidation reaction to provide nitrite ions for the anaerobic ammonia oxidation reaction.
The pretreated fermentation wastewater enters an anaerobic COD reactor, and the first COD degrading bacteria carry out anaerobic biochemical reaction by taking organic matters as nutrients to remove most of COD; a part of the effluent of the anaerobic COD reactor 1 enters the primary anaerobic ammonia oxidation reactor 2 through a second pipeline 52, is mixed with nitrite-containing wastewater which flows back through a first pipeline 51 bridged between the water outlet of the nitrosation reactor 3 and the water inlet of the primary anaerobic ammonia oxidation reactor 2, and then anaerobic ammonia oxidation reaction is carried out on the first anaerobic ammonia oxidation bacteria by taking nitrite and ammonia ions as nutrients, so that nitrogen is converted into nitrogen to be discharged, a small amount of nitrate ions are produced as byproducts, and the nitrate ions produced as the byproducts are removed under the denitrification action of the first denitrifying bacteria and are converted into nitrogen to be discharged; meanwhile, the residual COD in the sewage is subjected to further biochemical reaction under the action of the associated second COD degrading bacteria, is removed and is converted into biogas; and (2) effluent water from the first anaerobic ammoxidation reaction enters a nitrosation reaction, nitrite bacteria utilize ammonia and oxygen to carry out a biochemical reaction in the nitrosation reaction, most of ammonia is converted into nitrite ions, the conversion proportion can be manually regulated and controlled within a certain range, part of effluent water from the nitrosation reaction flows back to the first anaerobic ammoxidation reaction, the other part of effluent water enters a second anaerobic ammoxidation reaction and is mixed with the other part of effluent water bridged over the anaerobic COD reaction, residual ammonia ions and nitrite ions in the wastewater are converted into nitrogen under the action of second anaerobic ammoxidation bacteria, a small amount of nitrate ions are produced as a byproduct, the nitrate ions produced as the byproduct are completely converted into nitrogen under the denitrification action of the second denitrification bacteria and are discharged, and most of residual COD is converted into biogas by third COD degrading bacteria.
In the anaerobic COD reactor, organic matters in the wastewater are subjected to hydrolysis, acidification, acetic acid production, methane production and other reactions under the action of microorganisms in the reactor, COD is removed, and a mixture of methane and CO2 is generated.
In the anaerobic COD reactor, organic matters in the fermentation wastewater are subjected to hydrolysis, acidification, acetic acid production, methane production and other reactions under the action of first COD degrading bacteria, COD is removed, and meanwhile, biogas is generated. Specifically, the anaerobic COD reaction is divided into four stages:
1. a hydrolysis stage: due to the large molecular volume of the macromolecular organic matter, the macromolecular organic matter can not directly pass through the cell wall of anaerobic bacteria, and needs to be decomposed into small molecules by extracellular enzymes outside microorganisms. Typical organic substances in wastewater, such as cellulose, are decomposed by cellulase into cellobiose and glucose, starch is decomposed into maltose and glucose, and protein is decomposed into short peptides and amino acids. The decomposed small molecules can enter the cell body through the cell wall to be decomposed in the next step.
2. And (3) acidification stage: the small molecular organic matters enter the cell bodies to be converted into simpler compounds and secreted out of the cells, and the main products of the stage are volatile fatty acids and partial products such as alcohols, lactic acid, carbon dioxide, hydrogen, ammonia, hydrogen sulfide and the like are generated.
3. An acetic acid production stage: at this stage, the product of the last step is further converted into acetic acid, carbonic acid, hydrogen and new cellular material.
4. A methanogenesis stage: at this stage, acetic acid, hydrogen, carbonic acid, formic acid and methanol are all converted to methane, carbon dioxide and new cellular material.
The fermentation wastewater discharged from the anaerobic COD reactor 1 still contains residual pollutants such as COD, nitrogen and phosphorus, and a part of the fermentation wastewater enters the primary anaerobic ammonia oxidation reactor 2 and is mixed with a reflux liquid which flows back from the nitrosation reaction in the primary anaerobic ammonia oxidation reactor 2. The mixed liquor is subjected to three types of reactions under the action of microorganisms in the primary anaerobic ammonia oxidation reactor 2.
One is that the second COD degrading bacteria further utilize the residual COD in the wastewater for fermentation, further remove the COD in the wastewater and generate biogas, and the process is the same as the anaerobic COD reaction, but the initial concentration is reduced and the final concentration is lower.
The other type is that the first anaerobic ammonia oxidation bacteria in the primary anaerobic ammonia oxidation reactor 2 perform anaerobic ammonia oxidation reaction by using ammonia nitrogen in the inlet water and nitrite ions in the reflux liquid, so that the ammonia nitrogen and the nitrite ions are converted into nitrogen to be discharged, and a small amount of nitrate ions are generated at the same time.
And thirdly, nitrate ions generated by the primary anaerobic ammonia oxidation reaction are finally converted into nitrogen gas to be discharged under the denitrification action of the associated first denitrifying bacteria.
Denitrification, which is a process in which microorganisms reduce nitrate and nitrite to gaseous nitrogen and nitrogen under anaerobic conditions, is a major biological process in which active nitrogen is returned to the atmosphere in the form of nitrogen. The reaction equation is as follows:
C6H12O6+12NO3 -→6H2O+6CO2+12NO2 -+ energy
5CH3COOH+8NO3 -→6H2O+10CO2+4N2+8OH-+ energy
The residual ammonia nitrogen and phosphorus in the effluent of the primary anaerobic ammonia oxidation reactor 2 enter a nitrosation reactor 3, oxygen is filled into the nitrosation reactor 3, nitrite bacteria take the ammonia nitrogen as food and provide energy by the oxygen to carry out nitrosation reaction in the body, and most of the ammonia nitrogen is converted into nitrite ions.
Nitrosation, the oxidation of ammonium to nitrite, is a process. The nitrite bacteria involved in this process are mainly of 5 genera: nitrosorhizopus; nitrosating a bacterium belonging to the genus vesiculobacter; nitrosococcus; nitrospira and Nitrospira. Among them, the action of the genus Nitrospora is dominant, and the species of Nitrospora europaea are common.
The effluent of the nitrosation reaction is divided into two parts, one part of the effluent flows back to the primary anaerobic ammonia oxidation reactor 2 and participates in the primary anaerobic ammonia oxidation reaction of the primary anaerobic ammonia oxidation reactor 2. The other part of the wastewater enters a secondary anaerobic ammonia oxidation reactor 4 and is mixed with the wastewater shunted from the primary anaerobic COD reactor 2 to carry out secondary anaerobic ammonia oxidation reaction and anaerobic COD reaction.
Through the reaction, COD, ammonia nitrogen and total nitrogen in the fermentation wastewater all meet the requirements of national emission standards. Then the sewage enters an advanced treatment process to carry out chemical phosphorus removal treatment, and finally the full-class standard discharge is realized.
During operation, the proportion of the wastewater entering the primary anaerobic ammonia oxidation reaction and the wastewater entering the secondary anaerobic ammonia oxidation reaction in the anaerobic COD reaction is adjusted according to requirements, and the steps S20 satisfy that: in terms of mole ratio, NH4 +：NO2 -Is 1: 1.32.
in addition, the proportion of the fermentation wastewater which is subjected to the nitrosation reaction and flows back to the anaerobic COD reaction and the wastewater which is subjected to the nitrosation reaction and enters the second-stage anaerobic ammonia oxidation reaction is adjusted as required, and the following steps are satisfied in step S40: in terms of mole ratio, NH4 +：NO2 -Is 1: 1.32, thereby ensuring that the proportion of ammonia nitrogen and nitrite nitrogen in the primary anaerobic ammonia oxidation reaction and the secondary anaerobic ammonia oxidation reaction is suitable for the anaerobic ammonia oxidation reaction, and further ensuring that ammonia nitrogen and total nitrogen are effectively removed.
The fermentation wastewater treatment method has the advantages that: COD is removed by adopting a multi-stage anaerobic method, namely: anaerobic COD reaction, primary anaerobic ammoxidation reaction and secondary anaerobic ammoxidation reaction can degrade COD without being assisted by aerobic treatment; meanwhile, different from the situation that the common anaerobic ammonia oxidation reaction is arranged behind the nitrosation reaction, the invention provides nitrite ions for the primary anaerobic ammonia oxidation by leading the primary anaerobic ammonia oxidation reaction and adopting the mode of effluent backflow of the nitrosation reaction, thereby simplifying the working procedures and further reducing the investment. The invention adopts a two-stage anaerobic ammonia oxidation reaction process, ammonia nitrogen enters a primary anaerobic ammonia oxidation reaction and a secondary anaerobic ammonia oxidation reaction after nitrosation, and the nitrosation reaction only needs to provide a small amount of oxygen for the nitrosation reaction. The whole biochemical process is combined to form the AAOA biochemical process flow, the sludge amount is small, namely: only a very small amount of anaerobic sludge and nitrosation sludge are contained, and aerobic sludge is not contained; the biogas yield is high: almost all COD is converted into methane instead of microorganisms, and the energy consumption is low. And the pretreatment, dephosphorization and advanced treatment are carried out by adopting the traditional method.
The invention has another advantage that the primary anaerobic ammonia oxidation reaction is preposed, the nitrosation reaction is postpositioned, and the primary anaerobic ammonia oxidation reaction and the nitrosation reaction are respectively and independently carried out, and the amount of wastewater which flows back to the primary anaerobic ammonia oxidation reaction can be flexibly controlled according to the result of the nitrosation, thereby controlling the total amount of nitroso roots which flows back to the primary anaerobic ammonia oxidation reaction. And the change of the total nitrite ion content in the wastewater generated by the nitrosation reaction is dynamically eliminated by adjusting the reflux.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims. In addition, all technical schemes of the invention can be combined. The word "comprising" does not exclude the presence of other devices or steps than those listed in a claim or the specification; the terms "first," "second," and the like are used merely to denote names, and do not denote any particular order. In this context, "parallel," "perpendicular," and the like are not strictly mathematical and/or geometric limitations, but also encompass tolerances as would be understood by one skilled in the art and permitted by fabrication or use.
Claims (6)
1. Fermentation effluent disposal system, its characterized in that: comprises an anaerobic COD reactor (1) for removing COD, a primary anaerobic ammonia oxidation reactor (2), a nitrosation reactor (3) and a secondary anaerobic ammonia oxidation reactor (4);
the water outlet of the anaerobic COD reactor (1) is communicated with the water inlet of the primary anaerobic ammonia oxidation reactor (2) through a second pipeline (52), the water outlet of the primary anaerobic ammonia oxidation reactor (2) is communicated with the water inlet of the nitrosation reactor (3) through a third pipeline (53), and the water outlet of the nitrosation reactor (3) is communicated with the water inlet of the secondary anaerobic ammonia oxidation reactor (4) through a fourth pipeline (54);
the second duct (52) communicates with the fourth duct (54) through a fifth duct (55), and the fourth duct (54) communicates with the second duct (52) through a first duct (51).
2. The fermentation wastewater treatment system according to claim 1, wherein: the anaerobic COD reactor (1) is any one of an anaerobic contact reactor, a UASB, an anaerobic baffle reactor, an EGSB, an anaerobic biofilter, an IC reactor and a horizontal flow anaerobic reactor.
3. The fermentation wastewater treatment system according to claim 1, wherein: the primary anaerobic ammoxidation reactor (2) is any one of an anaerobic contact reactor, a UASB, an anaerobic baffle plate reactor, an EGSB, an anaerobic biological filter, an IC reactor and a horizontal flow anaerobic reactor.
4. The fermentation wastewater treatment system according to claim 1, wherein: the secondary anaerobic ammoxidation reactor (4) is any one of an anaerobic contact reactor, a UASB, an anaerobic baffle plate reactor, an EGSB, an anaerobic biological filter, an IC reactor and a horizontal flow anaerobic reactor.
5. The method for treating fermentation wastewater using the fermentation wastewater treatment system according to any one of claims 1 to 4, comprising the steps of:
s5: adding first anaerobic bacteria into the anaerobic COD reactor (1), wherein the first anaerobic bacteria contain first COD degrading bacteria, adding second anaerobic bacteria into the primary anaerobic ammonia oxidation reactor (2), wherein the second anaerobic bacteria contain first anaerobic ammonia oxidation bacteria and first denitrifying bacteria, adding aerobic bacteria into the nitrosation reactor (3), wherein the aerobic bacteria contain nitrite bacteria, and adding third anaerobic bacteria into the secondary anaerobic ammonia oxidation reactor (4), wherein the third anaerobic bacteria contain second anaerobic ammonia oxidation bacteria and second denitrifying bacteria;
s10: anaerobic COD reaction, namely introducing the pretreated fermentation wastewater into the anaerobic COD reactor (1) for anaerobic reaction, and removing COD in the fermentation wastewater under the action of COD degrading bacteria;
s20: performing primary anaerobic ammonia oxidation reaction, namely introducing the fermentation wastewater subjected to anaerobic COD reaction into the primary anaerobic ammonia oxidation reactor (2) to perform primary anaerobic ammonia oxidation reaction;
s30: performing nitrosation reaction, namely introducing the fermentation wastewater subjected to the primary anaerobic ammoxidation reaction into the nitrosation reactor (3) for nitrosation reaction;
s40: performing secondary anaerobic ammonia oxidation reaction, namely introducing the fermentation wastewater subjected to the nitrosation reaction into the secondary anaerobic ammonia oxidation reactor (4) to perform secondary anaerobic ammonia oxidation reaction;
a part of the fermentation wastewater after the step S30 enters a secondary anaerobic ammonia oxidation reactor (4), and the other part of the fermentation wastewater returns to the second pipeline (52) through the first pipeline (51) to enter the primary anaerobic ammonia oxidation reactor (2);
a part of the fermentation wastewater after the step S10 enters the primary anammox reactor (2), and the other part of the fermentation wastewater is branched to the fourth pipeline (54) through the fifth pipeline (55) to enter the secondary anammox reactor (4).
6. The method for treating fermentation wastewater according to claim 5, characterized in that: in step S5, the second anaerobic bacteria further include a second COD degrading bacteria.
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2021
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