Device and method for realizing advanced denitrification of acrylic fiber wastewater and domestic sewage by means of segmented water feeding and double short-cut coupled anaerobic ammonia oxidation

Abstract

The device and method for realizing deep denitrification of acrylic fiber wastewater and domestic sewage by means of segmented water feeding and double short-cut coupled anaerobic ammonia oxidation belong to the field of biological treatment of industrial wastewater, the acrylic fiber wastewater is first taken as the first segment water feeding to enter the double short-cut anaerobic ammonia oxidation reactor, the reactor is operated in an aerobic mode, short-cut nitrification and coupled denitrification of anaerobic ammonia oxidation are realized by means of micro-oxygen aeration; then the domestic sewage is taken as the second segment water feeding to enter the reactor, the reactor is operated in an anoxic mode, short-cut denitrification and coupled denitrification of anaerobic ammonia oxidation are realized by means of carbon source in the domestic sewage. The water feeding amount of the domestic sewage is adjusted according to the residual nitrate content after the aerobic operation, so as to realize deep denitrification of the acrylic fiber wastewater and the domestic sewage. The present application realizes the collaborative deep denitrification of the acrylic fiber wastewater and the domestic sewage under the double short-cut coupled anaerobic ammonia oxidation process without additional carbon source, the theoretical denitrification rate can reach 100%.

Description

TECHNICAL FIELD

[0001] The application relates to a device and a method for realizing deep denitrification of acrylic fiber wastewater and domestic sewage by means of a segmented water-inlet double-short-range coupled anaerobic ammonia oxidation, and belongs to the technical field of industrial wastewater biological treatment. BACKGROUND

[0002] The acrylic fiber wastewater is an industrial wastewater mixed by production wastewater of spinning and recovery devices and polymerization devices in the acrylic fiber production process, is colorless and has no irritating odor, and has high COD and ammonia nitrogen contents. With the rapid growth of the acrylic fiber output, the discharge amount of the production wastewater is also rapidly increased, so that the demand for the acrylic fiber wastewater treatment technology arises at the historic moment.

[0003] The acrylic fiber wastewater has the following characteristics:

[0004] 1. The concentration of the refractory organic pollutants is high, and various high-molecular polymers and byproducts with different molecular masses are generated in the production;

[0005] 2. The B / C value is low, the biodegradability is poor, and the organic matter is difficult to be removed;

[0006] 3. The biological toxicity is high, and the existence of toxic pollutants such as SCN - , CN - inhibits the normal operation of the biochemical treatment;

[0007] 4. The N / C is high, the wastewater contains a high concentration of organic amine, and the N / C is out of balance after anaerobic ammonification

[0008] The separate treatment of the acrylic fiber wastewater faces the difficulties of nutrient element imbalance, the need for a large amount of additional carbon source and low treatment efficiency, while a large amount of biodegradable carbon source exists in the domestic sewage, and the collaborative treatment of the acrylic fiber wastewater and the domestic sewage can reduce the treatment difficulty of the acrylic fiber wastewater; the nutrient salts in the domestic sewage and the acrylic fiber wastewater are complementary to each other, the harmful substances are diluted with each other, the acid-base degree is adjusted with each other, the treatment difficulty of the acrylic fiber wastewater is reduced, and the biodegradable organic matter in the domestic sewage is used to realize the collaborative denitrification of the domestic sewage and the acrylic fiber wastewater under the condition of no additional carbon source.

[0009] The anaerobic ammonia oxidation is the most economical and efficient wastewater denitrification technology so far, has the characteristics of no need for additional carbon source, saving aeration, low sludge yield and high denitrification efficiency, and with the deepening of research, the anaerobic ammonia oxidation technology has been applied to the wastewater treatment directions of domestic sewage, landfill leachate and sludge digestion liquid. The autotrophic denitrification of the anaerobic ammonia oxidation needs substrates of ammonia nitrogen and nitrite, the ammonia nitrogen widely exists in the domestic sewage and various types of wastewater, and therefore how to provide a stable nitrite source for the anaerobic ammonia oxidation becomes one of the bottlenecks of the development of the anaerobic ammonia oxidation technology.

[0010] Short-cut nitrification and short-cut denitrification as two common nitrite supply methods have been widely studied and applied. Short-cut nitrification is carried out under the action of AOB, does not require organic matter, saves aeration energy consumption, and ammonia nitrogen is oxidized to nitrite by control strategy without further reaction, but the universal existence of NOB makes it difficult to maintain short-cut nitrification, and nitrate is easily produced, which ultimately leads to the instability of nitrite supply. In addition, part of the by-product nitrate produced by anaerobic ammonia oxidation cannot be removed; and short-cut denitrification as a new way of supplying nitrite can reduce nitrate to nitrite in the presence of carbon source, thereby providing sufficient substrate for the anaerobic ammonia oxidation process, and further completing the deep denitrification using the by-product nitrate of anaerobic ammonia oxidation, with fast reaction rate and simple control without the need for complex control means. Compared with the traditional denitrification process, the double short-cut anaerobic ammonia oxidation process not only can save organic carbon source and aeration energy consumption, but also can reduce the emission of excess sludge and greenhouse gas, and is a new type of wastewater denitrification technology with important research value and practical application value. SUMMARY

[0011] The application discloses a device and method for realizing deep denitrification of acrylic fiber wastewater and domestic sewage by means of double short-cut coupled anaerobic ammonia oxidation through segmented water feeding.

[0012] The device and method for realizing deep denitrification of acrylic fiber wastewater and domestic sewage by means of double short-cut coupled anaerobic ammonia oxidation through segmented water feeding are characterized by comprising an acrylic fiber wastewater raw water tank (1), a domestic sewage raw water tank (2), a double short-cut anaerobic ammonia oxidation reactor (3) and a water outlet tank (4); first water feeding is fed from the acrylic fiber wastewater raw water tank (1) into the double short-cut anaerobic ammonia oxidation reactor by a first water feeding peristaltic pump (3.1), and second water feeding is fed from the domestic sewage raw water tank into the double short-cut anaerobic ammonia oxidation reactor by a second water feeding peristaltic pump (3.2); air is fed into the double short-cut anaerobic ammonia oxidation reactor by an aeration pump (3.3) through a gas flow meter (3.4), wherein a stirring device (3.5), a pH / DO monitoring device (3.6) and an ammonia nitrogen / nitrate monitoring device (3.7) are arranged in the double short-cut anaerobic ammonia oxidation reactor; and water outlet of the double short-cut anaerobic ammonia oxidation reactor is fed into the water outlet tank through a water outlet valve (3.8).

[0013] The treatment process of acrylic fiber wastewater and domestic sewage in the device is as follows: the first section of the acrylic fiber wastewater is first introduced into the double short-cut anaerobic ammonia oxidation reactor, all ammonia nitrogen in the acrylic fiber wastewater is removed by the short-cut nitrification and anaerobic ammonia oxidation synergistic effect of the functional bacteria through micro-oxygen aeration in the aerobic mode, and the generated nitrate nitrogen enters the anoxic stage. The initial domestic sewage is introduced into the double short-cut anaerobic ammonia oxidation reactor as the second section of the wastewater, so that the ammonia nitrogen and nitrate nitrogen concentration ratio of the mixed wastewater is 1:1, the degradable organic matter in the domestic sewage is used as the carbon source, the short-cut denitrification anaerobic ammonia oxidation reaction is completed, and the remaining nitrogen in the reactor is removed. Through the above process, the deep denitrification of the acrylic fiber wastewater and the domestic sewage without additional carbon source can be realized

[0014] The device and method for realizing the deep denitrification of the acrylic fiber wastewater and the domestic sewage by the stepwise water introduction double short-cut coupled anaerobic ammonia oxidation of the application are characterized by comprising the following contents:

[0015] (1) Start-up of the short-cut nitrification coupled anaerobic ammonia oxidation stage: the double short-cut anaerobic ammonia oxidation reactor is inoculated with the short-cut nitrification anaerobic ammonia oxidation sludge, so that the mixed liquid suspended solid concentration in the reactor after inoculation is 2000±500 mg / L, and the mixed liquid volatile suspended solid concentration is 1400±350 mg / L; in this stage, the reactor is operated in the aerobic mode with the acrylic fiber wastewater as the only water inlet;

[0016] The water inlet pumps the acrylic fiber wastewater from the acrylic fiber wastewater raw water tank into the double short-cut anaerobic ammonia oxidation reactor, the aeration pump and the stirring device start to operate, the dissolved oxygen is controlled to be 0.1-0.5 mg / L through the gas flow meter, the aeration time is controlled through the ammonia nitrogen online monitoring equipment, and the aeration is stopped when the ammonia nitrogen concentration is less than 1 mg / L; after the aeration is completed, the sludge is allowed to stand and settle, the settling time is set to be 20 min, and the drainage ratio is 50%; the reactor inlet and outlet water is detected, and when Δc(NO3 - -N) / Δc(NH4 + -N) = 0.2-0.4, the total nitrogen in the effluent is less than 15 mg / L, and more than 15 days are maintained, the short-cut nitrification coupled anaerobic ammonia oxidation stage is considered to be started up;

[0017] Δc(NO3 - -N) = effluent nitrate nitrogen concentration - inlet nitrate nitrogen concentration

[0018] Δc(NH4 + -N) = inlet ammonia nitrogen concentration - effluent ammonia nitrogen concentration

[0019] (3) The start-up of the short-range coupled anaerobic ammonia oxidation stage: After the start-up of the short-range nitrification anaerobic ammonia oxidation, the sludge after domestication is reserved, and short-range denitrification anaerobic ammonia oxidation sludge is continuously inoculated into the reactor, so that the mixed liquor suspended solids concentration in the reactor after inoculation is 3000±500 mg / L, and the mixed liquor volatile suspended solids concentration is 2100±350 mg / L; in this stage, acrylic fiber wastewater and domestic sewage are used as the influent of the reactor, the first-stage influent is acrylic fiber wastewater, the second-stage influent is domestic sewage, and the reactor is operated in an aerobic-anoxic mode;

[0020] The first-stage influent is pumped into the double short-range anaerobic ammonia oxidation reactor from the acrylic fiber wastewater raw water tank, and the influent amount is 40% of the reactor volume, the aeration pump and the stirring device start to operate, the dissolved oxygen is controlled to be 0.1-0.5 mg / L through the gas flow meter, the aeration time is controlled through the ammonia nitrogen online monitoring equipment, and when the ammonia nitrogen concentration is less than 1 mg / L, the aeration is stopped; after the aeration is completed, the sludge is allowed to settle, the settling time is set to 20 min, and the drainage ratio is 50%; after the aeration is completed, the second-stage influent is pumped into the double short-range anaerobic ammonia oxidation reactor from the domestic sewage raw water tank, so that the ammonia nitrogen concentration and the nitrate nitrogen concentration ratio after the influent is 1:1, and anoxic stirring is performed; the anoxic operation time is controlled through the ammonia nitrogen and nitrate nitrogen online detection equipment, and when the ammonia nitrogen and nitrate nitrogen concentrations are both lower than 5 mg / L, the anoxic stirring is stopped; after the stirring is completed, the sludge is allowed to settle, the settling time is set to 20 min, and the drainage ratio is 50%; the reactor effluent is detected, and when the total nitrogen in the effluent is less than 10 mg / L, the ammonia nitrogen is less than 5 mg / L, and this condition is maintained for more than 15 days, it is considered that the short-range denitrification coupled anaerobic ammonia oxidation stage is started up;

[0021] (4) The late-stage operation stage: the first-stage influent is pumped into the double short-range anaerobic ammonia oxidation reactor from the acrylic fiber wastewater raw water tank, and the influent amount is 40% of the effective volume, the aeration pump and the stirring device start to operate, the dissolved oxygen is controlled to be 0.1-0.5 mg / L through the gas flow meter, the aeration time is detected through the ammonia nitrogen online monitoring equipment, and the double short-range anaerobic ammonia oxidation reactor performs denitrification in the aeration stage through the short-range nitrification coupled anaerobic ammonia oxidation mode, and when the ammonia nitrogen concentration is less than 1 mg / L, the aeration is stopped to enter the anoxic stirring stage; the second-stage influent is pumped into the double short-range anaerobic ammonia oxidation reactor from the domestic sewage raw water tank at the beginning of the anoxic stirring, so that the ammonia nitrogen concentration and the nitrate nitrogen concentration ratio after the influent is 1:1, and the anoxic operation time is controlled through the ammonia nitrogen and nitrate nitrogen online detection equipment, and when the ammonia nitrogen and nitrate nitrogen concentrations are both lower than 5 mg / L, the anoxic stirring is stopped; after the anoxic stirring is completed, the sludge is allowed to settle, and the settling time is set to 20 min; the drainage ratio is set to 50%, and after the settling is completed, the supernatant is discharged into the effluent tank through the drainage valve. Each day, 3 cycles are operated, and each reaction cycle is 8 h, including the first-stage influent, aeration, second-stage influent, anoxic stirring, settling, drainage, and idle stage

[0022] The present application realizes deep denitrification of acrylic fiber wastewater and domestic sewage by segmented water feeding double short-cut coupled anaerobic ammonia oxidation, and has the following advantages compared with the existing process:

[0023] (1) Short-cut nitrification anaerobic ammonia oxidation can theoretically reduce 60% of aeration energy consumption and 100% of carbon source of PN / A process;

[0024] (2) The nitrate concentration generated by the front short-cut nitrification anaerobic ammonia oxidation is used to determine the domestic sewage inflow, and the ammonia nitrogen and nitrate online detection device is used, so that the process operation is easy to control;

[0025] (3) In the short-cut denitrification anaerobic ammonia oxidation, not only the byproduct nitrate generated by anaerobic ammonia oxidation can be deeply removed, but also when more nitrate is generated in the PN process, the nitrogen removal rate of the system can be improved, and the denitrification efficiency of the double short-cut anaerobic ammonia oxidation process can reach 100% in theory;

[0026] (4) The segmented water feeding double short-cut anaerobic ammonia oxidation fully utilizes the organic matter in domestic sewage, does not need to add external carbon source, saves aeration energy consumption, has less sludge discharge, and produces less greenhouse gas N2O. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 The present application realizes deep denitrification of acrylic fiber wastewater and domestic sewage by segmented water feeding double short-cut coupled anaerobic ammonia oxidation, and has the following advantages compared with the existing process:

[0028] Figure 1 Medium: 1-acrylic fiber wastewater raw water tank, 2-domestic sewage raw water tank, 3-double short-cut anaerobic ammonia oxidation reactor, 4-outlet tank; 3.1-first water feeding peristaltic pump, 3.2-second water feeding peristaltic pump, 3.3-aeration pump, 3.4-gas flow meter, 3.5-pH / DO monitoring device, 3.6-agitation device, 3.7-ammonia nitrogen / nitrate monitoring device, 3.8-drain valve. DETAILED DESCRIPTION

[0029] The application is further described below in combination with the drawings and embodiments: the device and method for realizing deep denitrification of acrylic fiber wastewater and domestic sewage by segmented water feeding and double short-coupling anaerobic ammonia oxidation, characterized in that: it comprises an acrylic fiber wastewater raw water tank (1), a domestic sewage raw water tank (2), a double short-coupling anaerobic ammonia oxidation reactor (3), and a water outlet tank (4); the first-stage water feeding is pumped from the acrylic fiber wastewater raw water tank (1) into the double short-coupling anaerobic ammonia oxidation reactor by a first water feeding peristaltic pump (3.1), and the second-stage water feeding is pumped from the domestic sewage raw water tank into the double short-coupling anaerobic ammonia oxidation reactor by a second water feeding peristaltic pump (3.2); air is pumped into the double short-coupling anaerobic ammonia oxidation reactor by an aeration pump (3.3) through a gas flow meter (3.4), wherein a stirring device (3.5), a pH / DO monitoring device (3.6), and an ammonia nitrogen / nitrate nitrogen monitoring device (3.7) are arranged in the double short-coupling anaerobic ammonia oxidation reactor, and the water outlet of the double short-coupling anaerobic ammonia oxidation reactor is connected to the water outlet tank through a water outlet valve (3.8).

[0030] The wastewater from a certain community septic tank in Beijing and the wastewater discharged by a certain acrylic fiber production plant are taken as the treatment objects, and the specific water quality during the operation is as follows: the COD of the domestic sewage is 150-250 mg / L, the NH4 + -N is 50-70 mg / L, the NO3 - -N≤2 mg / L, the NO2 - -N≤0.5 mg / L; the NH4 + -N of the acrylic fiber wastewater is 80-100 mg / L, the NO3 - -N≤2 mg / L, the NO2 - -N≤0.5 mg / L; the test system is as shown in Figure 1

[0031] The specific operation is as follows

[0032] (1) Start-up of the short-coupling nitrification and anaerobic ammonia oxidation stage: the double short-coupling anaerobic ammonia oxidation reactor is inoculated with short-coupling nitrification and anaerobic ammonia oxidation sludge, so that the mixed liquid suspended solid concentration in the reactor after inoculation is 2000±500 mg / L, and the mixed liquid volatile suspended solid concentration is 1400±350 mg / L; in this stage, the reactor is operated in an aerobic mode with the acrylic fiber wastewater as the only water feeding.

[0033] The water feeding is pumped from the acrylic fiber wastewater raw water tank into the double short-coupling anaerobic ammonia oxidation reactor, the aeration pump and the stirring device start to operate, the dissolved oxygen is controlled to be 0.1-0.5 mg / L through the gas flow meter, the aeration time is controlled through the ammonia nitrogen online monitoring equipment, and the aeration is stopped when the ammonia nitrogen concentration is less than 1 mg / L; after the aeration is completed, the sludge is allowed to stand and settle, the settling time is set to be 20 min, and the water drainage ratio is 50%; the water feeding and the water outlet of the reactor are detected, and when Δc(NO3 - -N) / Δc(NH4 + ​-N) = 0.2-0.4, the total nitrogen in the effluent is less than 15 mg / L, and the short-cut nitrification coupled with anaerobic ammonia oxidation stage is considered to be started for more than 15 days;

[0034] Δc(NO3 - -N) = the nitrate nitrogen concentration in the effluent - the nitrate nitrogen concentration in the influent

[0035] Δc(NH4 + -N) = the ammonia nitrogen concentration in the influent - the ammonia nitrogen concentration in the effluent

[0036] (3) Start of the double short-cut coupled anaerobic ammonia oxidation stage: after the start of the short-cut nitrification anaerobic ammonia oxidation, the sludge after domestication is retained, and short-cut denitrification anaerobic ammonia oxidation sludge is continuously inoculated into the reactor, so that the mixed liquor suspended solids concentration in the reactor is 3000±500 mg / L after inoculation, and the mixed liquor volatile suspended solids concentration is 2100±350 mg / L; in this stage, acrylic fiber wastewater and domestic sewage are used as the influent of the reactor, the first-stage influent is acrylic fiber wastewater, the second-stage influent is domestic sewage, and the reactor is operated in an aerobic-anoxic mode;

[0037] The first-stage influent is pumped into the double short-cut anaerobic ammonia oxidation reactor from the acrylic fiber wastewater raw water tank, the influent amount is 40% of the reactor volume, the aeration pump and the stirring device start to operate, the dissolved oxygen is controlled to be 0.1-0.5 mg / L through the gas flow meter, and the aeration time is controlled through the ammonia nitrogen online monitoring equipment, and the aeration is stopped when the ammonia nitrogen concentration is less than 1 mg / L; after the aeration is completed, the sludge is allowed to settle, the settling time is set to 20 min, and the drainage ratio is 50%; after the aeration is completed, the second-stage influent is pumped into the double short-cut anaerobic ammonia oxidation reactor from the domestic sewage raw water tank, so that the ratio of the ammonia nitrogen concentration and the nitrate nitrogen concentration after the influent is 1:1, and anoxic stirring is performed; the anoxic operation time is controlled through the ammonia nitrogen and nitrate nitrogen online detection equipment, and the anoxic stirring is stopped when the ammonia nitrogen and nitrate nitrogen concentrations are both lower than 5 mg / L; after the stirring is completed, the sludge is allowed to settle, the settling time is set to 20 min, and the drainage ratio is 50%; the reactor effluent is detected, and when the total nitrogen in the effluent is less than 10 mg / L and the ammonia nitrogen is less than 5 mg / L for more than 15 days, the short-cut denitrification coupled with anaerobic ammonia oxidation stage is considered to be started;

[0038] (4) Late running stage: the first section of influent is pumped into the double short-cut ANAMMOX reactor from the acrylic fiber wastewater raw water tank, the influent amount is 40% of the effective volume, the aeration pump and the stirring device start to run, the dissolved oxygen is controlled to be 0.1-0.5mg / L through the gas flow meter, the aeration time is detected through the ammonia nitrogen online monitoring equipment, the double short-cut ANAMMOX reactor carries out denitrification through the short-cut nitrification coupled with ANAMMOX mode in the aeration stage, when the ammonia nitrogen concentration is less than 1mg / L, the aeration is stopped to enter the anoxic stirring stage; the second section of influent is pumped into the double short-cut ANAMMOX reactor from the domestic sewage raw water tank at the beginning of the anoxic stirring, so that the ammonia nitrogen concentration and the nitrate nitrogen concentration ratio after the influent is 1:1, the anoxic running time is controlled through the ammonia nitrogen and nitrate nitrogen online detection equipment, when the ammonia nitrogen and nitrate nitrogen concentrations are both lower than 5mg / L, the anoxic stirring is stopped; after the anoxic stirring is finished, the sludge is deposited, the deposition time is set to be 20min; the drainage ratio is set to be 50%, after the deposition is finished, the supernatant is discharged into the effluent tank through the drainage valve. Each day runs 3 cycles, each reaction cycle is 8h, including the first section of influent, aeration, the second section of influent, anoxic stirring, deposition, drainage and idle stage.

[0039] The test results show that: after stable running, after the acrylic fiber wastewater and domestic sewage are segmented into the double short-cut coupled ANAMMOX reactor, the effluent is run through the aerobic and anoxic mode, NH4 + -N is lower than 5mg / L, total nitrogen is lower than 10mg / L, the effluent ammonia nitrogen, nitrite, nitrate, total nitrogen, SCN - and other technical indexes are stably reached the wastewater comprehensive discharge standard.

[0040] The above is the specific embodiment of the present application, which is convenient for the technical personnel in the technical field to better understand and apply the present application, the implementation of the present application is not limited to this, therefore the simple improvement of the present application made by the technical personnel in the technical field is within the scope of the present application.

Claims

1. A method for achieving advanced denitrification of acrylic fiber wastewater and domestic sewage by using a segmented feed water double short-cut coupled anaerobic ammonia oxidation, characterized in that: The device used in the method comprises an acrylic fiber wastewater raw water tank (1), a domestic sewage raw water tank (2), a double short-cut anaerobic ammonia oxidation reactor (3), and a water outlet tank (4); the first-stage water inlet is pumped from the acrylic fiber wastewater raw water tank (1) into the double short-cut anaerobic ammonia oxidation reactor by a first water inlet peristaltic pump (3.1), and the second-stage water inlet is pumped from the domestic sewage raw water tank into the double short-cut anaerobic ammonia oxidation reactor by a second water inlet peristaltic pump (3.2); air is pumped into the double short-cut anaerobic ammonia oxidation reactor by an aeration pump (3.3) through a gas flow meter (3.4), wherein a stirring device (3.5), a pH / DO monitoring device (3.6), and an ammonia nitrogen / nitrate nitrogen monitoring device (3.7) are arranged in the double short-cut anaerobic ammonia oxidation reactor, and the water outlet of the double short-cut anaerobic ammonia oxidation reactor is connected to the water outlet tank through a water outlet valve (3.8); The method comprises the following processes: (1) Start-up of the short-cut nitrification coupled anaerobic ammonia oxidation stage: the double short-cut anaerobic ammonia oxidation reactor is inoculated with short-cut nitrification anaerobic ammonia oxidation sludge, so that the mixed liquid suspended solid concentration in the reactor is 2000±500 mg / L and the mixed liquid volatile suspended solid concentration is 1400±350 mg / L after inoculation; in this stage, the reactor is operated in an aerobic mode with acrylic fiber wastewater as the only water inlet; The influent is pumped into the double short-cut ANAMMOX reactor from the acrylic fiber wastewater raw water tank. The aeration pump and the stirring device start to operate. The dissolved oxygen is controlled to be 0.1-0.5 mg / L through the gas flow meter. The aeration time is controlled through the ammonia nitrogen online monitoring equipment. When the ammonia nitrogen concentration is less than 1 mg / L, the aeration is stopped. After the aeration is completed, the sludge is allowed to settle and deposit. The settling time is set to be 20 min, and the drainage ratio is 50%. The influent and effluent of the reactor are detected. When ∆c(NO3 - -N) / ∆c(NH4 + -N)=0.2-0.4, the total nitrogen in the effluent is less than 15 mg / L, and is maintained for more than 15 days, it is considered that the short-cut nitrification coupled ANAMMOX stage is started. Δc(NO3 - - N) = effluent nitrate nitrogen concentration - influent nitrate nitrogen concentration Δc(NH4 + - = Influent ammonia concentration - Effluent ammonia concentration The concentrations are all mass concentrations; (3) Start-up of the double short-cut coupled anaerobic ammonia oxidation stage: after the start-up of the short-cut nitrification anaerobic ammonia oxidation, the domesticated sludge is retained, and short-cut denitrification anaerobic ammonia oxidation sludge is inoculated into the reactor, so that the mixed liquid suspended solid concentration in the reactor is 3000±500 mg / L and the mixed liquid volatile suspended solid concentration is 2100±350 mg / L after inoculation; in this stage, the reactor is operated in an aerobic-anoxic mode with acrylic fiber wastewater and domestic sewage as the water inlets, the first-stage water inlet is acrylic fiber wastewater, and the second-stage water inlet is domestic sewage; The first-stage water inlet is pumped from the acrylic fiber wastewater raw water tank into the double short-cut anaerobic ammonia oxidation reactor, the water inlet amount is 40% of the reactor volume, the aeration pump and the stirring device start to operate, the dissolved oxygen is controlled to be 0.1-0.5 mg / L through the gas flow meter, the aeration time is controlled through the ammonia nitrogen online monitoring equipment, and the aeration is stopped when the ammonia nitrogen concentration is less than 1 mg / L; after the aeration is completed, the sludge is allowed to stand and settle, the settling time is set to be 20 min, and the drainage ratio is 50%; after the aeration is completed, the second-stage water inlet is pumped from the domestic sewage raw water tank into the double short-cut anaerobic ammonia oxidation reactor, so that the ammonia nitrogen concentration and the nitrate nitrogen concentration are in a ratio of 1:1 after the water inlet, and anoxic stirring is performed; the anoxic operation time is controlled through the ammonia nitrogen and nitrate nitrogen online detection equipment, and the anoxic stirring is stopped when the ammonia nitrogen and nitrate nitrogen concentrations are both lower than 5 mg / L; after the stirring is completed, the sludge is allowed to stand and settle, the settling time is set to be 20 min, and the drainage ratio is 50%; the reactor water outlet is detected, and the short-cut denitrification coupled anaerobic ammonia oxidation stage is considered to be started up when the total nitrogen in the water outlet is less than 10 mg / L, the ammonia nitrogen is less than 5 mg / L, and the conditions are maintained for more than 15 days. (4) Late operation stage: the first stage of influent is pumped into the double short-cut ANAMMOX reactor from the acrylic fiber wastewater raw water tank, and the influent volume is 40% of the effective volume. The aeration pump and the stirring device start to operate. The dissolved oxygen is controlled to be 0.1-0.5 mg / L through the gas flow meter. The aeration time is detected through the ammonia nitrogen online monitoring equipment. The double short-cut ANAMMOX reactor carries out denitrification through the short-cut nitrification coupled with ANAMMOX in the aeration stage. When the ammonia nitrogen concentration is less than 1 mg / L, the aeration stops and the anoxic stirring stage starts. The second stage of influent is pumped into the double short-cut ANAMMOX reactor from the domestic sewage raw water tank at the beginning of the anoxic stirring, so that the ratio of the ammonia nitrogen concentration to the nitrate nitrogen concentration after the influent is 1:

1. The anoxic operation time is controlled through the ammonia nitrogen and nitrate nitrogen online detection equipment. When the ammonia nitrogen and nitrate nitrogen concentrations are both lower than 5 mg / L, the anoxic stirring stops. After the anoxic stirring ends, the sludge is allowed to settle. The settling time is set to be 20 min. The drainage ratio is set to be 50%. After the settling ends, the supernatant is discharged into the effluent tank through the drainage valve. Three cycles are operated every day, and each reaction cycle is 8 h, including the first stage of influent, aeration, the second stage of influent, anoxic stirring, settling, drainage, and idle stage.

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