CN114620840A - Method for deep denitrification of municipal sewage by anaerobic ammonia oxidation - Google Patents

Method for deep denitrification of municipal sewage by anaerobic ammonia oxidation Download PDF

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CN114620840A
CN114620840A CN202210018734.7A CN202210018734A CN114620840A CN 114620840 A CN114620840 A CN 114620840A CN 202210018734 A CN202210018734 A CN 202210018734A CN 114620840 A CN114620840 A CN 114620840A
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denitrification
effluent
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nitrogen
ammonia oxidation
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刘建勇
林驰浩
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University of Shanghai for Science and Technology
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Abstract

The invention discloses a method for deep denitrification of urban sewage by anaerobic ammonia oxidation, which comprises the following steps: carrying out enhanced primary sedimentation on the municipal sewage, shunting the obtained enhanced primary sedimentation water, and allowing the dry flow to enter an anoxic tank and an aerobic tank for nitrification and denitrification treatment to respectively obtain nitrogen and nitrification and denitrification effluent; carrying out short-cut denitrification treatment on the branch and the nitrified and denitrified effluent to obtain short-cut denitrification effluent containing nitrite nitrogen and ammonia nitrogen; carrying out anaerobic digestion on the primary sludge to obtain anaerobic digestion liquid and methane; after the anaerobic digestion solution is subjected to short-cut nitrification, the anaerobic digestion solution is mixed with short-cut nitrification effluent containing nitrite provided by a side stream in an anaerobic ammonia oxidation reaction tank to obtain nitrogen and anaerobic ammonia oxidation effluent, and the advanced denitrification treatment of the municipal sewage is completed. According to the method for the anaerobic ammonia oxidation and deep denitrification of the municipal sewage, disclosed by the invention, the organic matters in the municipal sewage are recycled, the quality of effluent is improved, an additional carbon source is not required to be added, and the operation cost is reduced.

Description

Method for deep denitrification of municipal sewage by anaerobic ammonia oxidation
Technical Field
The invention relates to a method for deep denitrification of urban sewage by anaerobic ammonia oxidation, belonging to the technical field of biological sewage treatment.
Background
At present, the resource recovery direction of organic matters in municipal sewage mainly comprises the following steps: anaerobic treatment is carried out by utilizing an anaerobic membrane bioreactor, organic matters are removed by strengthening primary sedimentation, the organic matters are quickly adsorbed by a high-load activated sludge method, and the precipitated sludge is subjected to anaerobic digestion to generate energy substances such as methane and the like. The method greatly reduces the dissipation of carbon in the subsequent process and improves the energy recovery efficiency.
If a large amount of substances such as nitrogen, phosphorus and the like contained in the urban sewage are directly discharged without treatment, the water quality is deteriorated, particularly the discharge of nitrogen causes a serious eutrophication problem to slow-flowing water. The traditional urban sewage denitrification process is a nitrification-denitrification method, because the organic matter content of the urban sewage in China is low, the COD content of the sewage is further reduced (the carbon-nitrogen ratio is less than 5) after the sewage is subjected to the organic matter recovery treatment, and the carbon source requirement (nitrification-denitrification-theory COD/NO) in the nitrification-denitrification process cannot be met (nitrification-denitrification-theory COD/NO)3 -N is 5), and increasingly strict municipal sewage treatment standards are added, so that the effluent nitrate nitrogen concentration exceeds the standard only by the traditional nitrification and denitrification process, and the standard emission of nitrogen is difficult to realize. In order to meet the discharge standard, an external carbon source is often required to be added to the sewage with low C/N ratio, so that the sewage denitrification cost is undoubtedly increased, the problem of increase of the residual sludge amount is caused, and an additional treatment process and cost are increased, therefore, the method is important for finding a novel technology which is economical and green and can effectively solve the problem of deep denitrification of the urban sewage.
The discovery of ANAMMOX (ANAMMOX) breaks through the understanding of people on the classical nitrogen circulation theory, is different from the traditional nitrification and denitrification process, ammonia nitrogen in water needs to be nitrified in the whole process, and then the denitrification is carried out by taking organic matters as electron donors to generate nitrogen. The anaerobic ammonia oxidation process can directly react ammonia nitrogen and nitrite nitrogen to complete denitrification, has the theoretical total nitrogen removal rate of about 89%, has the advantages of low energy consumption, no need of adding a carbon source, low sludge yield, less greenhouse gas emission and the like, and is an effective novel technology for solving the problem of deep denitrification of municipal sewage.
Nitrite nitrogen and ammonia nitrogen are used as two major substrates of the anaerobic ammonia oxidation process, and stable supply is an important condition for realizing the process. The preposed process of the traditional nitrification and denitrification method removes a large amount of organic matters from sewage to cause the problem of insufficient carbon source, residual nitrate nitrogen often exists in effluent water and cannot be directly used as a substrate in the anaerobic ammonia oxidation process, and short-range denitrification is needed to convert the residual nitrate nitrogen into nitrite nitrogen. The carbon source required by the short-cut denitrification process can be supplemented by the urban sewage of the branch flow, and ammonia nitrogen can be provided for the anaerobic ammonia oxidation of the later stage. However, the short-cut denitrification process is optimized for COD/NO3 -N is 3, and the control of NO is often needed in the actual anaerobic ammonia oxidation treatment process2 --N/NH4 +N is close to 1, so COD/NO of short-cut denitrification feed water3 -N, NO of anammox process2 --N/NH4 +the-N ratio balance problem needs to be solved. In order to improve the quality of the effluent and reduce the denitrification cost, further research needs to be carried out on how to realize the stable operation of the urban sewage deep denitrification process through regulating and controlling the quality and the quantity of the effluent.
Disclosure of Invention
In view of the above defects in the prior art, the technical problem to be solved by the present invention is that after most of the organic matters in the municipal sewage are removed, the nitrogen removal rate is not high when the conventional nitrification and denitrification process is used for denitrification treatment, and the increasingly strict discharge requirements cannot be met, or an external carbon source needs to be added, which leads to an increase in cost. The invention provides a method for deep denitrification of urban sewage by anaerobic ammonia oxidation, which is used for carrying out reinforced primary sedimentation on the urban sewage, transferring most organic matters from a liquid phase to solid-phase primary sedimentation sludge, and carrying out anaerobic digestion on the sludge to realize resource utilization. The existing traditional nitrification and denitrification process is improved, the short-cut denitrification and anaerobic ammonia oxidation process is arranged at the rear, the carbon source required by the short-cut denitrification and the ammonia nitrogen required by the anaerobic ammonia oxidation are supplemented by the branch flow of the primary sedimentation water, and the nitrite nitrogen generated by the short-cut nitrification of the sludge anaerobic digestion liquid is utilized for regulation, so that the purpose of deep denitrification by the anaerobic ammonia oxidation process is realized, and the urban sewage discharge standard is met. In addition, the in-situ solid-liquid separation device is arranged in the aerobic tank, the short-range denitrification tank and the anaerobic ammonia oxidation tank, so that the arrangement of a sedimentation tank is reduced, and the site and the operating cost are further reduced.
The invention provides a method for deep denitrification of urban sewage by anaerobic ammonia oxidation, which comprises the following steps:
performing enhanced primary sedimentation on the municipal sewage to obtain enhanced primary sedimentation water with lower primary sedimentation sludge and carbon nitrogen ratio;
splitting the enhanced primary sedimentation water, including a main flow and a branch flow, wherein the main flow enters an anoxic tank and an aerobic tank for nitrification and denitrification treatment to obtain nitrogen and nitrification and denitrification effluent; the branch flows enter a short-range denitrification pool;
carrying out short-range denitrification treatment on the nitrified and denitrified effluent and the enhanced primary sedimentation effluent of the branch to remove residual nitrate nitrogen in the nitrified and denitrified effluent and organic matters in the enhanced primary sedimentation effluent of the branch so as to obtain short-range denitrification effluent;
carrying out anaerobic digestion on the primary sludge to obtain methane and sludge anaerobic digestion liquid;
carrying out short-cut nitrification on the sludge anaerobic digestion liquid to obtain side-stream short-cut nitrification effluent containing nitrite;
mixing the short-cut denitrification effluent and the short-cut nitrification effluent containing nitrite provided by the side flow in an anaerobic ammonia oxidation reaction tank, carrying out anaerobic ammonia oxidation reaction, removing nitrite nitrogen and ammonia nitrogen, obtaining nitrogen and anaerobic ammonia oxidation effluent, and completing the anaerobic ammonia oxidation deep denitrification treatment of the municipal sewage.
Further, the method comprises the following steps:
carrying out nitrification and denitrification treatment on the municipal sewage of the dry flow by using nitrification and denitrification bacteria to obtain nitrogen and nitrification and denitrification effluent;
treating the nitrification and denitrification effluent and the branch enhanced primary sedimentation effluent by using short-range denitrifying bacteria, and synchronously removing residual nitrate nitrogen in the nitrification and denitrification effluent and organic matters in the branch enhanced primary sedimentation effluent to obtain short-range denitrification effluent;
anaerobic digestion is carried out on the primary sludge by utilizing hydrolytic acidification bacteria, hydrogen-producing acetogenic bacteria and methanogenic bacteria to obtain methane and sludge anaerobic digestion solution;
performing short-cut nitrification treatment on the sludge anaerobic digestive fluid by using short-cut nitrifying bacteria to obtain side-stream short-cut nitrified effluent containing nitrite;
and (3) treating the short-cut denitrification effluent and the side-stream short-cut nitrification effluent containing nitrite by using anaerobic ammonium oxidation bacteria to obtain nitrogen and anaerobic ammonium oxidation effluent, thereby completing the anaerobic ammonium oxidation deep denitrification treatment of the municipal sewage.
Further, the removal efficiency of the enhanced primary sedimentation on organic matters in the municipal sewage is 0.6-0.7, and the enhanced primary sedimentation hardly affects the concentration of ammonia nitrogen.
Furthermore, the concentration of ammonia nitrogen in the enhanced primary precipitation water is 30-70mg/L, and the carbon-nitrogen ratio is less than 5.
Further, the reflux ratio of the nitrifying liquid in the anoxic tank to the nitrifying liquid in the aerobic tank is set to be 2-4.
Further, the treatment of the enhanced primary sedimentation effluent of the dry flow is sequentially carried out in an anoxic tank, an aerobic tank, a short-range denitrification tank and an anaerobic ammonia oxidation tank; wherein the aerobic tank comprises a nitrifying liquid reflux and sludge reflux system.
And further, treating the reflux nitrification liquid by using denitrifying bacteria in the anoxic tank to obtain denitrification effluent and nitrogen, wherein the denitrifying bacteria convert nitrate nitrogen in the reflux nitrification liquid into nitrogen by using organic matters in the municipal sewage inlet water as a carbon source under the anoxic condition.
Further, nitrifying bacteria are used for treating the urban main stream wastewater in the aerobic tank to obtain nitrified effluent, and specifically, the nitrifying bacteria are used for performing full-process nitrification on ammonia nitrogen in the urban main stream wastewater by using oxygen to generate nitrate nitrogen.
Further, the concentration of nitrate nitrogen in the effluent of nitrification and denitrification is less than 70mg/L, and COD is almost completely consumed by the nitrification and denitrification.
Further, the intensified primary sedimentation water and the nitrification denitrification of the branchAfter the chemical effluent is mixed, COD/NO3 --N is from 2.8 to 3.2.
Further, after the enhanced primary sedimentation water and the nitrification and denitrification effluent of the branch are mixed, the mixture is treated by short-range denitrifying bacteria, and specifically, the short-range denitrifying bacteria reduce nitrate nitrogen in the nitrification and denitrification effluent into nitrite nitrogen by using organic matters in the enhanced primary sedimentation water of the branch.
Further, the concentration of nitrite provided by the side-stream short-cut nitrification effluent is 500-3000 mg/L.
Further, after the effluent of the short-cut denitrification and the effluent of the nitrite provided by the side stream short-cut nitrification are mixed, NO is generated2 --N/NH4 +N is 1.0 to 1.2.
Further, mixing the short-cut denitrification effluent and nitrite effluent provided by side-stream short-cut nitrification, and treating by using anaerobic ammonia oxidation bacteria, specifically, reacting by using ammonia nitrogen and nitrite nitrogen in the short-cut denitrification effluent and nitrite nitrogen provided by the side-stream short-cut nitrification effluent to generate nitrogen.
Further, an in-situ solid-liquid separation system is arranged in the aerobic tank, the short-range denitrification tank and the anaerobic ammonium oxidation tank, and particularly, the aerobic tank, the short-range denitrification tank and the anaerobic ammonium oxidation tank realize in-situ mud-water separation by utilizing the in-situ solid-liquid separation system.
Furthermore, the sludge discharged from the aerobic tank partially flows back, and the residual sludge in the aerobic tank, the sludge discharged from the short-distance denitrification tank and the primary sludge are subjected to anaerobic digestion together.
Further, the amount of sludge discharged from the anammox tank is small, and the sludge is directly discharged as waste sludge.
Technical effects
According to the method for the anaerobic ammonia oxidation deep denitrification of the urban sewage, provided by the invention, a large amount of organic matters in the sewage are removed through strengthening primary sedimentation, and the obtained primary sedimentation sludge is subjected to anaerobic digestion, so that resource utilization is realized. In the conventional nitrification and denitrification process, short-cut denitrification and anaerobic ammonia oxidation processes are arranged behind, a carbon source required by short-cut denitrification and ammonia nitrogen required by anaerobic ammonia oxidation are supplemented by the enhanced primary sedimentation water of the branch, organic matters in the branch are used as the carbon source of the short-cut denitrification to generate nitrate nitrogen required by the anaerobic ammonia oxidation process, and nitrite nitrogen provided by short-cut nitrification of sludge anaerobic digestion liquid is used for regulation and control to realize the anaerobic ammonia oxidation process. The anaerobic ammonia oxidation deep denitrification of the municipal sewage is realized by regulating and controlling the water quality and the water quantity, organic matters are not required to be additionally input, and the treatment cost is reduced. In addition, the in-situ solid-liquid separation device is arranged in the aerobic tank, the short-range denitrification tank and the anaerobic ammonia oxidation tank, so that the arrangement of a sedimentation tank is reduced, and the site and the operating cost are further reduced.
The method is simple and easy to implement, has high economic benefit, and transfers a large amount of organic matters into solid-phase sludge by strengthening primary sedimentation, thereby avoiding the escape of carbon in subsequent treatment and reducing carbon emission; the obtained sludge is subjected to anaerobic digestion to generate energy substances such as methane and the like, and the resource utilization is promoted. In addition, no additional organic matter or other electron donor is needed for deep denitrification. The carbon source required by short-cut denitrification and the ammonia nitrogen required by the anaerobic ammonia oxidation process are provided by introducing the enhanced primary sedimentation water of the branch, so that the synchronous denitrification and decarbonization of the municipal sewage can be effectively realized. The use of the in-situ solid-liquid separation device further saves the cost, has obvious comprehensive benefits and meets the requirement of increasingly strict discharge standards on the limit denitrification of the urban sewage.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Drawings
FIG. 1 is a schematic process flow diagram of a method for deep denitrification of municipal sewage by anammox according to a preferred embodiment of the present invention;
FIG. 2 is a schematic diagram showing the variation of the enhanced initial-precipitation municipal sewage carbon-nitrogen ratio of 4 in the method for deep denitrification of anaerobic ammonia oxidation of municipal sewage according to a preferred embodiment of the invention;
FIG. 3 is a schematic diagram showing the variation of the enhanced initial-precipitation municipal sewage carbon-nitrogen ratio 2 pollutants in the method for deep denitrification of anaerobic ammonia oxidation of municipal sewage according to a preferred embodiment of the invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular internal procedures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
The invention provides a method for deep denitrification of urban sewage by anaerobic ammonia oxidation, which comprises the following steps:
performing enhanced primary sedimentation on the municipal sewage to obtain enhanced primary sedimentation water and primary sedimentation sludge;
splitting the enhanced primary sedimentation water, including a main flow and a branch flow, wherein the main flow enters an anoxic tank and an aerobic tank, and the enhanced primary sedimentation water of the main flow is subjected to nitrification and denitrification treatment to obtain nitrogen and nitrification and denitrification effluent; the branch flows enter a short-range denitrification pool;
carrying out short-range denitrification treatment on the nitrified and denitrified effluent and the enhanced primary sedimentation effluent of the branch to remove residual nitrate nitrogen in the nitrified and denitrified effluent and organic matters in the enhanced primary sedimentation effluent of the branch so as to obtain short-range denitrification effluent;
carrying out anaerobic digestion on the primary sludge to obtain methane and anaerobic digestion liquid;
carrying out short-cut nitrification on the anaerobic digestion solution to obtain side-stream short-cut nitrification effluent containing nitrite;
mixing the short-cut denitrification effluent and the side-stream short-cut nitrification effluent containing nitrite in an anaerobic ammonia oxidation reaction tank, carrying out an anaerobic ammonia oxidation process, removing nitrite nitrogen and ammonia nitrogen, obtaining nitrogen and anaerobic ammonia oxidation effluent, and completing the anaerobic ammonia oxidation deep denitrification treatment of the municipal sewage.
Specifically, as shown in fig. 1, the method comprises the following steps:
carrying out nitrification and denitrification treatment on the municipal sewage of the dry flow by using nitrification and denitrification bacteria to obtain nitrogen and nitrification and denitrification effluent;
treating the nitrified and denitrified effluent and the enhanced primary sedimentation effluent of the tributary by using short-range denitrifying bacteria, and synchronously removing residual nitrate nitrogen in the nitrified and denitrified effluent and organic matters in the enhanced primary sedimentation effluent of the tributary to obtain short-range denitrifying effluent;
anaerobic digestion is carried out on the primary sludge by utilizing hydrolytic acidification bacteria, hydrogen-producing acetogenic bacteria and methanogenic bacteria to obtain methane and sludge digestion liquid;
carrying out short-cut nitrification on the sludge digestive juice by using short-cut nitrifying bacteria to obtain side-stream short-cut nitrified effluent containing nitrite;
and (3) treating the short-cut denitrification effluent and the sidestream short-cut nitrification effluent containing nitrite by using anaerobic ammonium oxidation bacteria to obtain nitrogen and anaerobic ammonium oxidation effluent, thereby finishing the anaerobic ammonium oxidation advanced denitrification treatment of the municipal sewage.
Further, the treatment is sequentially carried out in an anoxic tank, an aerobic tank, a short-range denitrification tank and an anaerobic ammonia oxidation tank, wherein the aerobic tank is provided with a nitrification liquid reflux system and a sludge reflux system.
Further, the aerobic tank, the short-range denitrification tank and the anaerobic ammonium oxidation tank realize in-situ mud-water separation by using an in-situ solid-liquid separation system.
The removal efficiency of the enhanced primary sedimentation on organic matters is 60 percent; the reflux ratio of nitrifying liquid in the anoxic tank and the aerobic tank is set to be 3; the intensified primary sedimentation sewage and the nitrified and denitrified effluent of the branch are mixed in a short-range denitrification tank, and then COD/NO is added3 --N is 3; after the effluent of the short-cut denitrification and the effluent of the nitrite provided by the side-stream short-cut nitrification are mixed in the anaerobic ammonia oxidation tank, NO is generated2 --N/NH4 +-N is 1; the concentration of nitrite in the side-stream short-cut nitrification effluent is 1000 mg/L.
When the water quality and the proportion are different, the process needs to be regulated and controlled to achieve a better treatment effect. Two examples are shown below, and when the water quality is different and the proportion is different, a better treatment effect can be achieved by regulating and controlling the process.
Example one
In this embodiment, after the municipal sewage is subjected to the enhanced primary precipitation, the ammonia nitrogen concentration in the enhanced primary precipitation effluent is 50mg/L, the C/N ratio is 4, and the specific operation flow is shown in fig. 2, and includes the following steps:
1. the flow rate is Q0The intensified primary sedimentation water is divided, and the flow rate of the main flow is Q1The branch flow rate is Q2The sewage contains COD and ammonia nitrogen.
2. Dry flow Q1And (3) entering an anoxic tank and an aerobic tank to carry out a nitrification and denitrification process, and enabling the nitrification and denitrification bacteria to fully utilize organic matters in the sewage to carry out nitrification and denitrification through the backflow of the nitrification liquid to obtain nitrogen and nitrification and denitrification effluent, wherein the nitrification and denitrification effluent contains residual nitrate nitrogen, the concentration of the nitrate nitrogen is 10mg/L, and the consumption of the organic matters is almost zero through the nitrification and denitrification process.
3. The nitrified and denitrified effluent of the aerobic tank enters a short-range denitrification tank, and the nitrified and denitrified effluent and the enhanced primary sedimentation effluent Q of the tributary are treated by short-range denitrifying bacteria2And (4) processing to synchronously remove the residual nitrate nitrogen in the nitrified and denitrified effluent and the organic matters in the strengthened primary sedimentation water of the branch flow to obtain short-range denitrified effluent containing nitrite nitrogen.
The reaction equation of the short-cut denitrification is as follows:
1.32NO3 -+0.55CH3COO-+0.088NH4 +→1.32NO2 -+0.088C5H7NO2+0.66HCO3 -+0.198H++0. 264H2O
according to COD/NO3 --N is 3:1 by regulating the substream Q2Meet the carbon source required by short-range denitrification and ensure all nitrate statesNitrogen can be converted to nitrous nitrogen. According to the water quality of different parts, Q can be obtained according to the research of a reaction formula1:Q220: 3, mainstream Q1Is 87% Q0Sub-stream Q2Is 13% Q0The ammonia nitrogen concentration in the short-cut denitrification effluent is 6.5mg/L, the nitrite concentration is 8.7mg/L,
4. and (4) allowing the short-cut denitrification effluent to enter an anaerobic ammoxidation reaction tank. The reaction equation for anammox is: NH (NH)4 ++1.32NO2 -+0.066HCO3 -+0.13H+→1.02N2+0.26NO3 -+0.066CH2O0.5N0.5+2.03H2O
Under the C/N ratio, the nitrite concentration is higher than the ammonia nitrogen concentration, so that nitrite nitrogen is not required to be supplied by side stream shortcut nitrification, anaerobic ammonia oxidation is directly carried out, nitrogen and anaerobic ammonia oxidation effluent are generated, and the effluent only contains 2.2mg/L of nitrite nitrogen and 1.4mg/L of nitrate nitrogen.
The embodiment is based on that after the municipal sewage is subjected to enhanced primary sedimentation, the change process of pollutants under different C/N conditions is correspondingly analyzed. By mixing the nitrification and denitrification effluent containing nitrate nitrogen and the enhanced primary sedimentation effluent of the tributary, organic matters contained in the municipal sewage are utilized to provide an electron donor for short-range denitrification, nitrite nitrogen required in the anaerobic ammonia oxidation process is generated, the municipal sewage simultaneously provides ammonia nitrogen for anaerobic ammonia oxidation, the substrate requirement of anaerobic ammonia oxidation is met, and the deep denitrification of the municipal sewage is realized. In the embodiment, the water Q is obtained by the strengthened primary precipitation of the municipal sewage0The main flow is divided into 87 percent of Q0The substream was 17% Q0And organic matters are not required to be additionally input, the deep denitrification effect that the effluent nitrite nitrogen concentration is 2.2mg/L and the nitrate nitrogen concentration is 1.4mg/L is realized, and the treatment cost is effectively reduced.
Example two
In this embodiment, after the municipal sewage is subjected to the enhanced primary precipitation, the ammonia nitrogen concentration in the enhanced primary precipitation effluent is 50mg/L, the C/N ratio is 2, and the specific operation flow is shown in fig. 2, and includes the following steps:
1. will be provided withFlow rate of Q0The intensified primary sedimentation water is divided, and the flow rate of the main flow is Q1The branch flow rate is Q2And the sewage contains COD and ammonia nitrogen.
2. Main flow Q1And (3) entering an anoxic tank and an aerobic tank to carry out a nitrification and denitrification process, and enabling the nitrification and denitrification bacteria to fully utilize organic matters in the sewage to carry out nitrification and denitrification through the backflow of the nitrification liquid to obtain nitrogen and nitrification and denitrification effluent, wherein the nitrification and denitrification effluent contains residual nitrate nitrogen, the concentration of the nitrate nitrogen is 30mg/L, and the consumption of the organic matters is almost zero through the nitrification and denitrification process.
3. The nitrified and denitrified effluent of the aerobic tank enters a short-range denitrification tank, and the nitrified and denitrified effluent and the enhanced primary sedimentation effluent Q of the tributary are treated by short-range denitrifying bacteria2Processing to synchronously remove the residual nitrate nitrogen in the nitrified and denitrified effluent and the organic matters in the strengthened primary sedimentation water of the branch flow to obtain short-cut denitrified effluent containing nitrite nitrogen
The reaction equation of the short-cut denitrification is as follows:
1.32NO3 -+0.55CH3COO-+0.088NH4 +→1.32NO2 -+0.088C5H7NO2+0.66HCO3 -+0.198H++0. 264H2O
according to COD/NO3 --N is 3:1 by regulating the substream Q2The carbon source required by the short-range denitrification is met, and all nitrate nitrogen can be converted into nitrite nitrogen. According to different water qualities and different proportions, design Q1:Q2Main stream Q of 10:91Is 52.6% Q0Side stream Q2Is 47.4% Q0The ammonia nitrogen concentration in the short-cut denitrification effluent is 23.7mg/L, the nitrite concentration is 15.8mg/L,
4. and (4) allowing the short-cut denitrification effluent to enter an anaerobic ammonia oxidation reaction tank. The reaction equation for anammox is: NH (NH)4 ++1.32NO2 -+0.066HCO3 -+0.13H+→1.02N2+0.26NO3 -+0.066CH2O0.5N0.5+2.03H2O
Because the nitrite concentration is less than the ammonia nitrogen concentration under the C/N ratio, the side-stream short-cut nitrified effluent Q is needed3Supplying nitrite nitrogen to supply NO for anaerobic ammonia oxidation of influent water2 --N/NH4 +N is 1, regulating the side flow short-cut nitrification effluent Q30.79% Q0And then carrying out anaerobic ammonia oxidation to generate nitrogen and anaerobic ammonia oxidation effluent, wherein the concentration of nitrate nitrogen in the effluent is 5.2 mg/L.
The embodiment is based on that after the municipal sewage is subjected to enhanced primary sedimentation, the change process of pollutants under different C/N conditions is correspondingly analyzed. By mixing the nitrification and denitrification effluent containing nitrate nitrogen and the enhanced primary sedimentation effluent of the tributary, organic matters contained in the municipal sewage are utilized to provide an electron donor for short-range denitrification, nitrite nitrogen required in the anaerobic ammonia oxidation process is generated, the municipal sewage simultaneously provides ammonia nitrogen for anaerobic ammonia oxidation, the substrate requirement of anaerobic ammonia oxidation is met, and the deep denitrification of the municipal sewage is realized. In the embodiment, the water Q is obtained by the strengthened primary precipitation of the municipal sewage0The split flow is carried out, and the dry flow is 52.6 percent Q0Substream of 47.4% Q0Side-stream short-cut nitrified effluent Q30.79% Q0And organic matters are not required to be additionally input, the deep denitrification effect of effluent nitrate nitrogen with the concentration of 5.2mg/L is realized, and the treatment cost is effectively reduced.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection determined by the claims.

Claims (17)

1. The method for deep denitrification of urban sewage through anaerobic ammonia oxidation is characterized by comprising the following steps of:
performing enhanced primary sedimentation on the municipal sewage to obtain enhanced primary sedimentation water and primary sedimentation sludge;
the intensified primary sedimentation water is divided into a main flow and a branch flow, the main flow enters an anoxic tank and an aerobic tank, and the intensified primary sedimentation water of the main flow is subjected to nitrification and denitrification treatment to obtain nitrogen and nitrification and denitrification effluent; the branch flows enter a short-range denitrification pool;
carrying out short-range denitrification treatment on the nitrified and denitrified effluent and the enhanced primary sedimentation effluent of the tributary, and removing residual nitrate nitrogen in the nitrified and denitrified effluent and organic matters in the enhanced primary sedimentation effluent of the tributary to obtain short-range denitrification effluent;
carrying out anaerobic digestion on the primary sludge to obtain methane and anaerobic digestion liquid;
carrying out short-cut nitrification on the anaerobic digestion solution to obtain side-stream short-cut nitrification effluent containing nitrite;
and mixing the short-cut denitrification effluent with the short-cut nitrification effluent containing nitrite provided by the side flow in an anaerobic ammonia oxidation reaction tank, carrying out an anaerobic ammonia oxidation process, removing nitrite nitrogen and ammonia nitrogen, obtaining nitrogen and anaerobic ammonia oxidation effluent, and finishing the anaerobic ammonia oxidation advanced denitrification treatment of the municipal sewage.
2. The method for deep denitrification of municipal sewage through anaerobic ammonia oxidation according to claim 1, comprising the steps of:
carrying out nitrification and denitrification treatment on the municipal sewage of the dry flow by using nitrification and denitrification bacteria to obtain nitrogen and nitrification and denitrification effluent;
treating the nitrified and denitrified effluent and the enhanced primary sedimentation effluent of the tributary by using short-range denitrifying bacteria, and synchronously removing residual nitrate nitrogen in the nitrified and denitrified effluent and organic matters in the enhanced primary sedimentation effluent of the tributary to obtain short-range denitrifying effluent;
anaerobic digestion is carried out on the primary sludge by utilizing hydrolytic acidification bacteria, hydrogen-producing acetogenic bacteria and methanogenic bacteria to obtain methane and sludge anaerobic digestion solution;
performing short-cut nitrification on the sludge digestive juice by using short-cut nitrifying bacteria to obtain side-stream short-cut nitrified effluent containing nitrite;
and (3) treating the short-cut denitrification effluent and the sidestream short-cut nitrification effluent containing nitrite by using anaerobic ammonia oxidation bacteria to obtain nitrogen and anaerobic ammonia oxidation effluent, and finishing the anaerobic ammonia oxidation deep denitrification treatment of the municipal sewage.
3. The method for deep denitrification of municipal sewage through anaerobic ammonia oxidation according to claim 2, wherein the enhanced primary sedimentation has an efficiency of removing organic matters in the municipal sewage of 0.6 to 0.7 and has no influence on the ammonia nitrogen concentration.
4. The method for deep denitrification of municipal sewage through anaerobic ammonia oxidation according to claim 2, wherein the concentration of ammonia nitrogen in the enhanced primary sedimentation water is 30-70mg/L, and the carbon-nitrogen ratio is < 5.
5. The method for deep denitrification by anaerobic ammonia oxidation of municipal sewage according to claim 2, wherein the concentration of ammonia nitrogen in the effluent of nitrification and denitrification is < 70mg/L, and COD is consumed by nitrification and denitrification.
6. The method for deep denitrification of municipal sewage through anaerobic ammonia oxidation according to claim 2, wherein the enhanced primary settling effluent treatment of the dry stream is carried out in an anoxic tank, an aerobic tank, a short-cut denitrification tank and an anaerobic ammonia oxidation tank in sequence; wherein, the aerobic tank comprises a nitrifying liquid reflux system and a sludge reflux system.
7. The method for deep denitrification of municipal sewage through anaerobic ammonia oxidation according to claim 2, wherein the nitrification liquid reflux ratio of the anoxic tank and the aerobic tank is set to 2-4.
8. The method for the anaerobic ammonia oxidation deep nitrogen removal of the municipal sewage according to claim 2, wherein the denitrification liquid is treated by denitrifying bacteria in an anoxic tank to obtain denitrifying effluent and nitrogen, and specifically, the denitrifying bacteria convert nitrate nitrogen in the refluxing nitrification liquid into nitrogen by using organic matters in the dry flow enhanced primary sedimentation effluent as a carbon source under anoxic conditions.
9. The method for deep denitrification of municipal sewage through anaerobic ammonia oxidation according to claim 2, wherein the enhanced primary sedimentation water of the dry stream is treated by nitrifying bacteria in the aerobic tank to obtain nitrified water, and specifically, the nitrifying bacteria nitrify ammonia nitrogen in the enhanced primary sedimentation water through the whole course by using oxygen to generate nitrate nitrogen.
10. The method for deep denitrification by anaerobic ammonia oxidation of municipal sewage according to claim 2, wherein the COD/NO ratio of the enhanced primary sludge effluent and the nitrification denitrification effluent of said side stream is adjusted after mixing3 --N is from 2.8 to 3.2.
11. The method for deep denitrification by anaerobic ammonia oxidation of municipal sewage according to claim 2, wherein the enhanced primary sedimentation water of the side stream and the nitrification denitrification effluent are mixed and then treated with short-cut denitrifying bacteria, specifically, the short-cut denitrifying bacteria reduce nitrate nitrogen in the nitrification denitrification effluent to nitrite nitrogen by using organic matter in the enhanced primary sedimentation water of the side stream.
12. The method for deep denitrification of municipal sewage by anaerobic ammonia oxidation according to claim 2, wherein the nitrite concentration of the side-stream shortcut nitrification effluent is 500-3000 mg/L.
13. The method for deep denitrification by anaerobic ammonia oxidation of municipal sewage according to claim 2, wherein NO is generated after the short-cut denitrification effluent and the side stream short-cut nitrification effluent are mixed2 --N/NH4 +-N is 1.0-1.2.
14. The method for deep denitrification of municipal sewage according to claim 2, wherein the short-cut denitrification effluent and the side-stream short-cut nitrification effluent are mixed and treated with anammox bacteria, and specifically, the anammox bacteria utilize ammonia nitrogen and nitrite nitrogen in the short-cut denitrification effluent to react with the nitrite nitrogen provided by the side-stream short-cut nitrification effluent to generate nitrogen.
15. The method for deep denitrification by anaerobic ammonia oxidation of municipal sewage according to claim 2, wherein an in-situ solid-liquid separation system is arranged in the aerobic tank, the short-cut denitrification tank and the anaerobic ammonia oxidation tank, and in particular, the aerobic tank, the short-cut denitrification tank and the anaerobic ammonia oxidation tank realize in-situ sludge-water separation by using the in-situ solid-liquid separation system.
16. The method for deep denitrification of municipal sewage through anaerobic ammonia oxidation according to claim 2, wherein a portion of sludge discharged from the aerobic tank is returned, and the excess sludge from the aerobic tank, the sludge discharged from the short-cut denitrification tank and the primary sludge are subjected to anaerobic digestion.
17. The method for deep denitrification of municipal sewage through anaerobic ammonia oxidation according to claim 2, wherein the sludge discharged from the anaerobic ammonia oxidation tank is low in volume and is directly discharged as waste sludge.
CN202210018734.7A 2022-01-09 2022-01-09 Method for deep denitrification of municipal sewage by anaerobic ammonia oxidation Pending CN114620840A (en)

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