CN115043491A - System and method for realizing maximization of Anammox denitrification of municipal sewage - Google Patents
System and method for realizing maximization of Anammox denitrification of municipal sewage Download PDFInfo
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Abstract
A system and a method for realizing maximization of Anammox denitrification of municipal sewage belong to the field of biological sewage treatment, and provide a reaction substrate NO for Anammox through three ways of mainstream short-cut nitrification, side-stream short-cut nitrification and short-cut denitrification 2 ‑ -N. Municipal sewage firstly enters an organic matter capture reactor to remove COD, and effluent flows into a main flow short-cut nitrification reactor to oxidize partial NH 4 + N, followed by high NO 2 ‑ The side flow short-cut nitrified effluent of the-N enters an Anammox reactor together for removal, the effluent and municipal sewage enter the short-cut denitrifying Anammox reactor together, and the organic matters in the municipal sewage are utilized to carry out NO treatment in the nitrification and Anammox processes 3 ‑ Conversion of-N to NO 2 ‑ N, by Anammox with NH in municipal sewage 4 + -N is removed in situ. The invention utilizes high NH of side stream 4 + Stable and high-efficient NO production by short-cut nitrification and short-cut denitrification of-N wastewater 2 ‑ The characteristic of-N, only needs to control a small amount of NH in the municipal sewage 4 + Oxidation of-N achieves efficient Anammox denitrification.
Description
Technical Field
The invention belongs to the technical field of biological sewage treatment, and particularly relates to a system and a method for realizing Anammox denitrification maximization of urban sewage, belonging to the technical field of biological sewage denitrification.
Background
Eutrophication of water is an important pollution problem facing and urgently needing to be solved in the world water environment, and eutrophication of water can cause massive death of aquatic organisms such as algae, fishes and the like in the water environment and can cause the phenomenon of blackening and smelling of the water. At present, the deep denitrification and dephosphorization of the urban domestic sewage becomes one of the important ways for restraining the eutrophication of the water body. The traditional nitrification/denitrification process is widely applied to global sewage treatment plants. However, considering the considerable energy consumption and the organic carbon requirement in the nitrification/denitrification process, the method is contrary to the current economic mode theme of green energy-saving sustainable development. With the stricter sewage discharge standard in China, a novel biological denitrification process with a sustainable development prospect is further explored, the addition of a carbon source and the consumption of aeration quantity are reduced, the important direction of the current-stage sewage treatment research is undoubtedly, and the method has profound practical significance.
Anaerobic ammonia oxidation (Anammox) is used as a novel autotrophic nitrogen removal technology, and anaerobic ammonia oxidizing bacteria use NO under the anoxic condition 2 - As an electron acceptor, reacting NH 4 + Conversion to N 2 The method has the advantages of no need of aeration and organic carbon source, low sludge yield, high denitrification load and the like, and becomes a research hotspot in the field of sewage denitrification. At present, the anaerobic ammonia oxidation technology is successfully applied to high ammonia nitrogen wastewater treatment projects such as sludge digestive fluid, landfill leachate, pharmaceutical wastewater, breeding wastewater and the like. However, for municipal sewage, NH is responsible 4 + Low N concentration, stable NO is difficult to achieve during short-cut nitrification 2 - Accumulation of-N, the process inevitably producing NO 3 - And N is-N, so that the anaerobic ammonia oxidation process has poor treatment effect and the total nitrogen concentration of effluent is high.
In recent years, the scholars in China put forward a new technology of short-cut denitrification for the first time to break through the Anammox process in the urban sewage treatmentDifficulty in obtaining NO stably 2 - The bottleneck-N provides a new method. The key problem of the current mainstream Anammox process is that the Anammox contribution rate is low, if the Anammox denitrification maximization of the urban sewage is realized, the aeration quantity and the consumption of a carbon source in the operation process are greatly reduced, and the Anammox process is more in line with the green sustainable development concept.
Based on the method, the deep denitrification process with the Anammox as the core is innovated on the basis of the prior art, the sidestream short-cut nitrification is utilized to assist and enhance the mainstream Anammox denitrification process, the mainstream short-cut nitrification and the short-cut denitrification process are combined, and the sidestream high NH is utilized 4 + Short-cut nitrification and short-cut denitrification of-N wastewater 2 - The stable and efficient generation of-N enables the Anammox denitrification of the municipal sewage to be maximized, and a new path is provided for the deep denitrification of the municipal sewage.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a system and a method for realizing the maximization of Anammox denitrification of municipal sewage, wherein a side-stream process is arranged to carry out short-cut nitrification on NO generated 2 - -N is supplemented into the mainstream Anammox reactor, and the mainstream shortcut nitrification and shortcut denitrification process simultaneously provides substrate NO for the Anammox reactor 2 - -N, innovative provision of NO for maximum Anammox utilizing composite process 2 - -N; on the other hand, the short-range denitrification coupling anaerobic ammonia oxidation process is arranged in the last link, and the nitrogen is removed from the bottom of the pocket, so that the maximum denitrification of the municipal sewage is realized, and the process stability and the municipal sewage treatment efficiency are greatly improved.
In order to solve the technical problem, the invention provides a system for realizing the maximization of Anammox denitrification of municipal sewage, which comprises: the system comprises a municipal sewage raw water tank (1), an organic matter capture reactor (2), a mainstream short-cut nitrification reactor (3), an anaerobic ammonia oxidation reactor (4), a short-cut denitrification coupling anaerobic ammonia oxidation reactor (5), a sludge anaerobic digestion liquid storage tank (6) and a side-stream short-cut nitrification reactor (7); wherein, sewage in the raw urban sewage tank (1) enters an organic matter capturing reactor (2) to capture and remove COD; organic captureThe effluent of the reactor (2) flows through a main flow short-cut nitrification reactor (3); the sludge digestive fluid in the sludge anaerobic digestive fluid storage tank (6) enters a side-flow short-cut nitrification reactor (6) for short-cut nitrification to produce NO 2 - -N; and finally, the effluent of the anaerobic ammonia oxidation reactor (4) and the municipal sewage enter a short-cut denitrification coupling anaerobic ammonia oxidation reactor (5) together for deep denitrification.
The urban sewage raw water tank (1) is a closed tank body and is provided with an overflow pipe I (1.1) and a blow-down pipe I (1.2);
the organic matter capturing reactor (2) is provided with a stirrer I (2.1), an aerator I (2.2), a gas flowmeter I (2.3), a gas pump I (2.4) and a water inlet pump I (2.5);
the main flow short-cut nitrification reactor (3) is provided with a stirrer II (3.1), a DO/pH on-line tester I (3.2), an aerator II (3.3), a gas flowmeter II (3.4), a gas pump II (3.5), a water inlet pump II (3.6) and a sampling port I (3.7);
the anaerobic ammoxidation reactor (4) is provided with a sampling port II (4.1), a water inlet pump III (4.2), a water outlet (4.3), a three-phase separator (4.4), a gas collecting bottle (4.5) and a water inlet pump IV (4.6);
the short-cut denitrification coupling anaerobic ammonia oxidation reactor (5) is provided with a stirrer III (5.1), a DO/pH on-line tester II (5.2), a sampling port III (5.3), a water inlet pump V (5.4) and a water inlet pump VI (5.5);
the sludge anaerobic digestion liquid storage tank (6) is provided with an overflow pipe I (6.1) and a blow-down pipe I (6.2);
the side-stream shortcut nitrification reactor (7) is provided with a stirrer IV (7.1), a DO/pH on-line tester III (7.2), an aerator III (7.3), a gas flow meter III (7.4), a gas pump III (7.5), a water inlet pump VII (7.6) and a sampling port IV (7.7). The method for realizing Anammox denitrification maximization of municipal sewage according to claim 1, is characterized by comprising the following steps:
1) starting the system: the sludge with short-cut nitrification activity is respectively added into a main flow short-cut nitrification reactor (3) and a side flow short-cut nitrification reactorIn the process nitrification reactor (6), the sludge concentration MLSS in the reactor is 3.0-4.0 g/L; adding sludge with anaerobic ammonia oxidation activity into an anaerobic ammonia oxidation reactor (4) to ensure that the sludge concentration MLSS in the reactor is 5.0-10.0 g/L; will have a high NO 2 - -N-accumulated short-range denitrification sludge and anaerobic ammonia oxidation activated sludge are mixed according to the mass concentration ratio of 1: 1-3, adding the mixture into a short-cut denitrification coupling anaerobic ammonia oxidation reactor (5) to ensure that the sludge concentration MLSS in the reactor is 4-6.0 g/L; the shortcut nitrification sludge NO 2 - The accumulation rate of-N is more than 90 percent, the activity of the anaerobic ammonia oxidation sludge is more than 20mg N/g VSS/h, and the short-cut denitrification sludge NO 3 - -N to NO 2 - -N conversion is greater than 80%.
2) The operation of the runtime adjustment is as follows
Introducing the municipal sewage into an organic matter capturing reactor, controlling the DO concentration of dissolved oxygen of the reactor to be 1.0-4.0 mg/L, controlling the hydraulic retention time to be 2-6 h, controlling the sludge retention time to be 2-6 d, and controlling the COD concentration of effluent to be 30-60 mg/L;
introducing the effluent of the organic matter capture reactor into a mainstream short-cut nitrification reactor, controlling the concentration of dissolved oxygen to be 0.1-0.5 mg/L, and controlling the retention time of sludge to be 8-15 d;
introducing the supernatant of anaerobic digestion of sludge into a side-flow short-cut nitrification reactor, controlling the concentration of dissolved oxygen to be 0.5-1.5 mg/L, the retention time of sludge to be 8-20 d, and NH 4 + -N removal greater than 90%, NO 2 - -N accumulation rate greater than 80%;
the effluent of the main flow shortcut nitrification reactor and the effluent of the side flow shortcut nitrification reactor enter an anaerobic ammonia oxidation reactor together, and the NO of the mixed influent water is controlled 2 - -N and NH 4 + The mass concentration ratio of-N to NO is 1.2-1.4, and the effluent NO of the reactor 2 - -N concentration less than 3 mg/L;
the effluent of the anaerobic ammoxidation reactor and the municipal sewage enter the short-cut denitrification coupling anaerobic ammoxidation reactor together to control NO in the mixed influent 3 - -N and NH 4 + The mass concentration ratio of-N to NO is 1.2-1.5, and COD and NO are 3 - The mass concentration ratio of-N to-N is 2.8-4And 5, the retention time of the sludge is 8-20 d, and the sludge discharged from the reactor is floc sludge with the particle size of less than 0.2 mm.
The anaerobic ammonia oxidation reactor operates when the anaerobic ammonia oxidation reactor is fed with NO 2 - -N and NH 4 + When the mass concentration ratio of-N is less than 1.2, improving NH of the mainstream shortcut nitrification reactor 4 + A removal rate of N, which, when it is greater than 1.4, reduces NH in the mainstream shortcut nitrification reactor 4 + -removal rate of N;
the anaerobic ammonia oxidation reactor operates when the effluent NO is 2 - The N concentration is more than 3mg/L, and the hydraulic retention time is properly prolonged;
when the short-cut denitrification is coupled with the operation process of the anaerobic ammonia oxidation reactor, COD and NO in the inlet water 3 - When the mass concentration ratio of-N is more than 4.5, COD and NO are reduced within the range of 2.8-4.5 by introducing the effluent of the organic matter capture reactor 3 - -N mass concentration ratio.
To sum up, the system and the method for realizing the maximum Anammox denitrification of the urban sewage have the following flow for treating the urban sewage: sewage in the urban sewage raw water tank enters an organic matter capturing reactor for capturing and removing COD; the effluent of the organic matter capture reactor flows through a main flow shortcut nitrification reactor; the sludge digestive fluid in the sludge anaerobic digestive fluid storage tank enters a side-flow short-cut nitrification reactor for short-cut nitrification to produce NO 2 - -N; and finally, the effluent of the anaerobic ammonia oxidation reactor and the municipal sewage enter the partial denitrification coupling anaerobic ammonia oxidation reactor together for deep denitrification.
Therefore, the system and the method for realizing the maximum Anammox denitrification of the municipal sewage have the following advantages:
1. short-cut nitrification of NO by using side-stream sludge anaerobic digestion liquid 2 - -N production, providing part of the substrate for mainstream Anammox, reducing municipal wastewater NH 4 + Oxidation ratio of N, thereby reducing the short-cut nitrification process of municipal sewageNO 3 - -generation of N;
2. the invention can maximize the autotrophic nitrogen removal ratio of the Anammox process in urban sewage, greatly reduce the aeration amount and carbon source consumption in the operation process, save energy, simultaneously accord with the sustainable development concept, and is suitable for engineering popularization and application;
3. on the other hand, NO generated in the nitrification process and the anaerobic ammonium oxidation reaction process is subjected to short-cut denitrification 3 - Conversion of-N to NO 2 - And N is removed through an Anammox way, the denitrification proportion of Anammox is further improved, the total nitrogen concentration of effluent is greatly reduced, the ultra-deep removal of nitrogen in the urban sewage can be realized, and the stricter requirement of the urban sewage treatment on the nitrogen in the future can be met.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts throughout.
FIG. 1 is a schematic view of a system flow for realizing the maximization of Anammox denitrification of municipal sewage.
FIG. 2 is a diagram showing the conversion of element C, N in the process flow.
AOB, short-cut nitrifying bacteria; anammox is an Anammox bacterium; NH (NH) 4 + Ammonia nitrogen; NO 2 - Nitrite nitrogen; NO 3 - Nitrate nitrogen; COD is chemical oxygen demand; MW is main stream urban sewage; DL, anaerobic digestion of sludge to obtain effluent; HRAS organic capture reactor; PDA, namely a short-cut denitrification coupling anaerobic ammonia oxidation reactor; PN, short-cut nitrification reactor.
Description of reference numerals:
in the figure, 1 is a municipal sewage raw water tank, 2 is an organic matter capture reactor, 3 is a mainstream short-cut nitrification reactor, 4 is an anaerobic ammonia oxidation reactor, 5 is a short-cut denitrification coupling anaerobic ammonia oxidation reactor, 6 is a sludge anaerobic digestion liquid storage tank, and 7 is a sidestream short-cut nitrification reactor; 1.1 is an overflow pipe I, and 1.2 is an emptying pipe I; 2.1 is a stirrer I, 2.2 is an aeration head I, 2.3 is a gas flow meter I, 2.4 is an air pump I, and 2.5 is a water inlet pump I; 3.1 is a stirrer II, 3.2 is a DO/pH on-line tester I, 3.3 is an aeration head II, 3.4 is a gas flow meter II, 3.5 is an air pump II, 3.6 is a water inlet pump II, and 3.7 is a sampling port I; 4.1 is a sampling port II, 4.2 is a water inlet pump III, 4.3 is a water outlet, 4.4 is a three-phase separator, 4.5 is a gas collecting bottle, and 4.6 is a water inlet pump IV; 5.1 is a stirrer III, 5.2 is a DO/pH on-line tester II, 5.3 is a sampling port III, 5.4 is a water inlet pump V, and 5.5 is a water inlet pump VI; 6.1 is an overflow pipe II, 6.2 is a blow-down pipe II, 7.1 is a stirrer IV, 7.2 is a DO/pH on-line determinator III, 7.3 is an aerator III, 7.4 is a gas flow meter III, 7.5 is a gas pump III, 7.6 is a water inlet pump VII, and 7.7 is a sampling port IV.
Detailed Description
The above-described scheme is further illustrated below with reference to specific embodiments, which are detailed below:
the invention is explained in more detail below with reference to the figures and examples: as shown in fig. 1, a system and method for maximizing Anammox denitrification of municipal sewage comprises:
sewage in the urban sewage raw water tank enters an organic matter capturing reactor to capture and remove COD; the effluent of the organic matter capture reactor flows through a main flow shortcut nitrification reactor; the sludge digestive fluid in the sludge anaerobic digestive fluid storage tank enters a side-flow short-cut nitrification reactor for short-cut nitrification to produce NO 2 - -N; and finally, the effluent of the anaerobic ammonia oxidation reactor and the municipal sewage enter the partial denitrification coupling anaerobic ammonia oxidation reactor together for deep denitrification.
The specific test water is taken from domestic sewage of a certain community, and the water quality is as follows: the COD concentration is 348.6 mg/L; NH (NH) 4 + N concentration 52.8mg/L, NO 2 - -N≤0.5mg/L，NO 3 - N is less than or equal to 0.5 mg/L. The anaerobic sludge digestion solution has the following water quality: NH (NH) 4 + N concentration 439.6mg/L, COD concentration 338.As shown in FIG. 1, the 8mg/L test system comprises an effective volume of an organic matter capture reactor of 8L, an effective volume of a mainstream shortcut nitrification reactor of 12L, an effective volume of a sidestream shortcut nitrification reactor of 1L, an effective volume of an anammox reactor of 3L, and an effective volume of a shortcut denitrification coupling anammox reactor of 5L. The bottom of the short-cut nitrification reactor and the bottom of the organic matter capture reactor are provided with aeration devices, and the constant dissolved oxygen can be controlled by adjusting a flow meter and DO online feedback.
The specific operation is as follows:
1. starting the system: respectively adding sludge with short-cut nitrification activity into a main flow short-cut nitrification reactor and a side flow short-cut nitrification reactor, and enabling the sludge concentration MLSS in the reactors to be 3.0 g/L; adding sludge with anaerobic ammonia oxidation activity into an anaerobic ammonia oxidation reactor, and enabling the sludge concentration MLSS in the reactor to be 6.0 g/L; will have a high NO 2 - -N-accumulated short-range denitrification sludge and anaerobic ammonia oxidation activated sludge are mixed according to the mass concentration ratio of 1: 3, adding the mixture into a short-cut denitrification coupling anaerobic ammonia oxidation reactor, and enabling the sludge concentration MLSS in the reactor to be 4.0 g/L. The short-cut nitrification sludge reaction process NO 2 - The accumulation rate of-N is more than 90 percent, NO is generated in the short-cut denitrification sludge reaction process 3 - -N to NO 2 - -N conversion is greater than 80%.
2. The runtime adjustment operation is as follows:
introducing municipal sewage (48L/d) into an organic matter capturing reactor, wherein when the concentration of dissolved oxygen DO in the reactor is 1.0-1.2 mg/L, the hydraulic retention time is 4h, and the sludge retention time is 3d, the effluent NH is 4 + The average N concentration was 49.3mg/L and the average COD concentration was 42.6 mg/L;
introducing the effluent of the organic matter trapping reactor into a main flow short-cut nitrification reactor, and when the dissolved oxygen concentration is about 0.3mg/L, the sludge retention time is 12 days, the reactor is operated for 8 periods (aerobic time is 2 hours in each period) every day, and the drainage ratio is 50 percent, discharging NH 4 + -N、NO 3 - -N、NO 2 - The average N concentration values are respectively 18.3mg/L, 12.4mg/L and 17.2 mg/L;
sludge blanketIntroducing oxygen digestion supernatant (1L/d) into a side-flow short-cut nitrification reactor, and when the dissolved oxygen concentration is about 1.0mg/L, the sludge retention time is 16d, the reactor runs for 2 cycles (aerobic per cycle is 1h) every day, and the water discharge ratio is 50 percent, discharging water NH 4 + The average concentration of N was 38.8mg/L, NO 2 - Average concentration of-N345.6 mg/L, NO 3 - -an average concentration of N of 35.5 mg/L;
the effluent (48L/d) of the main flow shortcut nitrification reactor and the effluent (1.0L/d) of the side flow shortcut nitrification reactor enter an anaerobic ammonia oxidation reactor together, the hydraulic retention time is 1.5h, and the effluent NO of the reactor is 2 - Average concentration of-N was 0.8mg/L, NH 4 + Average concentration of-N was 1.2mg/L, NO 3 - The average N concentration was 17.5 mg/L;
the effluent of the anaerobic ammoxidation reactor and municipal sewage (11L/d) enter a short-cut denitrification coupling anaerobic ammoxidation reactor together, and the effluent NH is treated under the condition that the hydraulic retention time is 2h and the sludge retention time is controlled to be 16d by discharging floc sludge (the particle size is less than 0.2mm) in the reactor 4 + Average concentration of-N of 1.3mg/L, NO 3 - Average concentration of-N of 3.4mg/L, NO 2 - N is almost 0 mg/L.
After the long-term operation is stable, the average value of the COD concentration of the final effluent of the combined system is 46.7mg/L, the average value of the TN concentration is 4.7mg/L, and the total nitrogen removal rate in the municipal sewage is up to 91.0 percent.
Claims (2)
1. The utility model provides a realize city sewage Anammox denitrogenation maximize system which characterized in that: the system is provided with a municipal sewage raw water tank (1), an organic matter capture reactor (2), a mainstream short-cut nitrification reactor (3), an anaerobic ammonia oxidation reactor (4), a short-cut denitrification coupling anaerobic ammonia oxidation reactor (5), a sludge anaerobic digestion liquid storage tank (6) and a side-stream short-cut nitrification reactor (7); wherein, sewage in the raw urban sewage tank (1) enters an organic matter capturing reactor (2) to capture and remove COD; the effluent of the organic matter capturing reactor (2) flows through the main flow short-cut nitrification reactor (3); the sludge digestion liquid in the sludge anaerobic digestion liquid storage box (6) enters the sideA flow short-cut nitrification reactor (6) for short-cut nitrification to produce NO 2 - -N; the effluent of the side flow short-cut nitrification reactor (6) and the effluent of the main flow short-cut nitrification reactor (3) are conveyed to the anaerobic ammonia oxidation reactor (4) together for nitrogen removal, and finally the effluent of the anaerobic ammonia oxidation reactor (4) and the municipal sewage enter the short-cut denitrification coupling anaerobic ammonia oxidation reactor (5) together for deep denitrification;
the urban sewage raw water tank (1) is a closed tank body and is provided with an overflow pipe I (1.1) and a blow-down pipe I (1.2);
the organic matter capturing reactor (2) is provided with a stirrer I (2.1), an aerator I (2.2), a gas flowmeter I (2.3), a gas pump I (2.4) and a water inlet pump I (2.5);
the main flow short-cut nitrification reactor (3) is provided with a stirrer II (3.1), a DO/pH on-line tester I (3.2), an aerator II (3.3), a gas flowmeter II (3.4), a gas pump II (3.5), a water inlet pump II (3.6) and a sampling port I (3.7);
the anaerobic ammonia oxidation reactor (4) is provided with a sampling port II (4.1), a water inlet pump III (4.2), a water outlet (4.3), a three-phase separator (4.4), a gas collecting bottle (4.5) and a water inlet pump IV (4.6);
the short-cut denitrification coupling anaerobic ammonia oxidation reactor (5) is provided with a stirrer III (5.1), a DO/pH on-line tester II (5.2), a sampling port III (5.3), a water inlet pump V (5.4) and a water inlet pump VI (5.5);
the sludge anaerobic digestion liquid storage tank (6) is provided with an overflow pipe I (6.1) and a blow-down pipe I (6.2);
the side-stream shortcut nitrification reactor (7) is provided with a stirrer IV (7.1), a DO/pH on-line tester III (7.2), an aerator III (7.3), a gas flow meter III (7.4), a gas pump III (7.5), a water inlet pump VII (7.6) and a sampling port IV (7.7).
2. The method for realizing Anammox denitrification maximization of municipal sewage by applying the system of claim 1, which comprises the following steps:
1) starting the system: respectively adding the sludge with short-cut nitrification activity into a main flow short-cut nitrification reactor and a side flow short-cut nitrification reactor to ensure that the sludge concentration MLSS in the reactors3.0-4.0 g/L; adding sludge with anaerobic ammonia oxidation activity into an anaerobic ammonia oxidation reactor, wherein the sludge concentration MLSS in the reactor is 5.0-10.0 g/L; short-range denitrification sludge and anaerobic ammonia oxidation sludge are mixed according to the mass concentration ratio of 1: 1-3, adding the mixture into a short-range denitrification coupling anaerobic ammonia oxidation reactor, and enabling the sludge concentration MLSS in the reactor to be 4-6.0 g/L; the short-cut nitrification sludge reaction process NO 2 - The accumulation rate of-N is more than 90 percent, NO is generated in the short-cut denitrification sludge reaction process 3 - -N to NO 2 - -N conversion greater than 80%;
2) the operation of the runtime adjustment is as follows
Introducing the municipal sewage into an organic matter capturing reactor, controlling the DO concentration of dissolved oxygen of the reactor to be 1.0-4.0 mg/L, controlling the hydraulic retention time to be 2-6 h, controlling the sludge retention time to be 2-6 d, and controlling the COD concentration of effluent to be 30-60 mg/L;
introducing the effluent of the organic matter capture reactor into a mainstream short-cut nitrification reactor, controlling the concentration of dissolved oxygen to be 0.1-0.5 mg/L, and controlling the retention time of sludge to be 8-15 d;
introducing the supernatant of anaerobic digestion of sludge into a side-flow short-cut nitrification reactor, controlling the concentration of dissolved oxygen to be 0.5-1.5 mg/L, the retention time of sludge to be 8-20 d, and NH 4 + -N removal greater than 90%, NO 2 - -N accumulation rate greater than 80%;
the effluent of the main flow shortcut nitrification reactor and the effluent of the side flow shortcut nitrification reactor enter an anaerobic ammonia oxidation reactor together, and the NO of the mixed influent water is controlled 2 - -N and NH 4 + The mass concentration ratio of-N to NO is 1.2-1.4, and the effluent NO of the reactor 2 - -N concentration less than 3 mg/L;
the effluent of the anaerobic ammoxidation reactor and the municipal sewage enter the short-cut denitrification coupling anaerobic ammoxidation reactor together to control NO in the mixed influent 3 - -N and NH 4 + The mass concentration ratio of-N to NO is 1.2-1.5, and COD and NO are 3 - The mass concentration ratio of N is 2.8-4.5, the retention time of sludge is 8-20 d, and the sludge discharged from the reactor is floc sludge with the particle size of less than 0.2 mm;
the anaerobic ammoxidation reactor is usedIn the course of which NO is added to the water 2 - -N and NH 4 + When the mass concentration ratio of-N is less than 1.2, improving NH of the mainstream shortcut nitrification reactor 4 + A removal rate of N, which, when it is greater than 1.4, reduces NH in the mainstream shortcut nitrification reactor 4 + -removal rate of N;
the anaerobic ammonia oxidation reactor operates when the effluent NO is 2 - The N concentration is more than 3mg/L, and the hydraulic retention time is properly prolonged;
when the short-cut denitrification is coupled with the operation process of the anaerobic ammonia oxidation reactor, COD and NO in the inlet water 3 - When the mass concentration ratio of-N is more than 4.5, COD and NO are reduced within the range of 2.8-4.5 by introducing the effluent of the organic matter capture reactor 3 - -N mass concentration ratio.
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