An integrated autotrophic denitrification treatment system with multiple operating modes

Abstract

The present invention discloses an integrated autotrophic denitrification treatment system with multiple operation modes, including: an A / O reactor, the A / O reactor includes an anoxic zone and an aerobic zone; an ANAMMOX reactor connected to the A / O reactor, the ANAMMOX reactor includes an ANAMMOX first reaction zone and an ANAMMOX second reaction zone; an MBR membrane separation device connected to the ANAMMOX reactor, the MBR membrane separation device is provided with an MBR membrane assembly, and the MBR membrane separation device is also connected with a water production unit and a sludge treatment unit; and an autotrophic denitrification control unit for controlling the A / O reactor, the ANAMMOX reactor, and the MBR membrane separation device. The present application can autonomously control and adjust the water inlet ratio and system operation parameters according to changes in sewage water quality, realize full / short-range nitrification and denitrification coupled anaerobic ammonia oxidation reaction under different operation modes, and realize the removal of ammonia nitrogen and nitrate nitrogen to the maximum extent, achieving the treatment goals of optimal treatment effect and lowest operation consumption.

Description

Technical Field

[0001] The present invention relates to the technical field of ammonia nitrogen-containing wastewater treatment, and in particular to an integrated autotrophic denitrification treatment system and method with multiple operation modes. Background Art

[0002] Kitchen biogas, sludge digestion liquid, garbage leachate, fermentation wastewater, as well as semiconductor chip wastewater, coal chemical wastewater, petrochemical wastewater, etc. have high COD and high NH4 + -N, low C / N, etc. At present, this type of wastewater mainly adopts the traditional biological denitrification treatment process of full nitrification and denitrification, and the main processes are A / O, oxidation ditch and SBR. The traditional biological denitrification process includes ammoniation stage, nitrification stage and denitrification stage, NH4 + -N is oxidized to NO3 by nitrifying bacteria - -N, denitrifying bacteria convert NO3 - -N is reduced to N2. Among them: the alkalinity consumed by the nitrification reaction is 7.07g / g and the oxygen demand is 4.27g / g; the alkalinity produced by the denitrification reaction is 3.57g / g, the oxygen production is 2.47g / g, and the carbon source consumption is 2.86g / g. The traditional biological denitrification treatment process has problems such as complex treatment process, high aeration energy consumption, large carbon source addition and large sludge production, and high operating costs.

[0003] The fully autotrophic biological denitrification technology based on ANAMMOX anaerobic ammonia oxidation reaction has the advantages of high denitrification efficiency, stable operation, energy saving and environmental friendliness. According to preliminary calculations, ANAMMOX anaerobic ammonia oxidation technology can save 60% of aeration volume compared with traditional technologies, does not consume carbon sources, and is less affected by the toxicity of free ammonia (FA) and free nitrite (FNA). It has high operating economy and technical promotion prospects, and is considered to be one of the most sustainable biological denitrification technologies for sewage today.

[0004] At present, anaerobic ammonium oxidation autotrophic denitrification technology has been applied in more than 200 industrial-scale projects, mainly for high-ammonia nitrogen wastewater and industrial wastewater. The main anaerobic ammonium oxidation technologies currently used are as follows: full autotrophic denitrification (CANON) process, oxygen-limited nitritation-anaerobic ammonium oxidation (OLAND) process, based on partial nitritation and anaerobic ammonium oxidation coupling reaction (PN / A), nitritation-anaerobic ammonium oxidation-denitrification (SNAD) process, short-range denitrification coupled anaerobic ammonium oxidation (PD / A) process, etc. The anaerobic ammonium oxidation reaction is based on NO2 - As an electron acceptor, ammonia nitrogen (NH4 + ) is directly oxidized to nitrogen (N2). Obviously, NO2 -Conversion and enrichment are the key to the success of ANAMMOX. However, in actual engineering applications, there are problems such as the difficulty in controlling stable short-term nitrification or short-term denitrification, and the difficulty in enriching anaerobic ammonium oxidizing bacteria. The reaction process is difficult to accurately control and must cope with the ever-changing influent water quality, resulting in a long start-up cycle for the anaerobic ammonium oxidation process and difficulty in starting the process, which greatly limits its engineering application. Summary of the invention

[0005] In view of the above technical problems in the related art, the present invention provides an integrated autotrophic denitrification treatment system with multiple operation modes, which can solve the above problems.

[0006] To achieve the above technical objectives, the technical solution of the present invention is implemented as follows:

[0007] An integrated autotrophic denitrification treatment system with multiple operating modes, comprising:

[0008] A / O reactor, the A / O reactor comprises an anoxic zone and an aerobic zone, the anoxic zone is provided with an anoxic zone microporous aeration device, an anoxic zone ORP meter, an anoxic zone DO meter, and a submersible agitator, the aerobic zone is provided with an aerobic zone microporous aeration device, an aerobic zone pH meter, an aerobic zone DO meter, the aerobic zone is also provided with an alkali addition point, and a nitrification liquid reflux unit is connected between the aerobic zone and the anoxic zone;

[0009] An ANAMMOX reactor connected to the A / O reactor, the ANAMMOX reactor comprising an ANAMMOX first reaction zone and an ANAMMOX second reaction zone, wherein the ANAMMOX first reaction zone and the ANAMMOX second reaction zone are both provided with suspended fillers, the ANAMMOX first reaction zone is also provided with a first reaction zone perforated aeration device, a first reaction zone agitator, and a first reaction zone DO meter, and the ANAMMOX second reaction zone is also provided with a second reaction zone pH meter, a second reaction zone ORP meter, and a second reaction zone agitator;

[0010] An MBR membrane separation device connected to the ANAMMOX reactor, wherein the MBR membrane separation device is provided with an MBR membrane assembly, and the MBR membrane separation device is also connected to a water production unit and a sludge treatment unit;

[0011] An autotrophic denitrification control unit for controlling the A / O reactor, the ANAMMOX reactor, and the MBR membrane separation device;

[0012] The A / O reactor and the ANAMMOX reactor are connected to the sewage water inlet end through the first water delivery component and the second water delivery component respectively.

[0013] Furthermore, the anoxic zone microporous aeration device, the aerobic zone microporous aeration device, the first reaction zone perforated aeration device, and the MBR membrane assembly are all connected to an aeration fan, and an anoxic zone automatic air inlet valve, an aerobic zone automatic air inlet valve, and a first reaction zone automatic air inlet valve are respectively provided on the input pipeline of the anoxic zone microporous aeration device, the input pipeline of the aerobic zone microporous aeration device, and the input pipeline of the first reaction zone perforated aeration device.

[0014] Furthermore, the nitrification liquid reflux unit comprises a nitrification liquid reflux pipeline connecting the anoxic zone and the aerobic zone, and the nitrification liquid reflux pipeline is provided with a nitrification liquid reflux pump, a heat exchanger, and a nitrification liquid reflux flowmeter in sequence.

[0015] Furthermore, the first water delivery component is connected to an A / O reactor water inlet flow meter and a first water inlet control valve, and the second water delivery component is connected to an ANAMMOX reactor water inlet flow meter and a second water inlet control valve.

[0016] Furthermore, the water production unit includes a water production pipeline connected to the MBR membrane separation device, and a water production pressure sensor, a water production pump, and a water production flow meter are sequentially arranged on the water production pipeline. The water production unit also includes a liquid level meter arranged in the MBR membrane separation device.

[0017] Furthermore, the sludge treatment unit includes a sludge discharge pipeline and a sludge recovery pipeline connected to the MBR membrane separation device, the sludge discharge pipeline is provided with a sludge discharge pump, the sludge recovery pipeline is provided with a sludge return pump and a sludge return flow meter in sequence, and the output end of the sludge recovery pipeline is connected to the A / O reactor.

[0018] Furthermore, the autotrophic denitrification control unit includes a control cabinet, a host computer communicatively connected to the control cabinet, and an instrument for monitoring the A / O reactor, an instrument for monitoring the ANAMMOX reactor, and an instrument for monitoring the MBR membrane separation device are all electrically connected to the control cabinet.

[0019] Furthermore, the first reaction zone agitator and the second reaction zone agitator are both vertical liftable paddle agitators, with a circulation ratio of ≥50 and an upward flow rate of ≥0.05 m / s.

[0020] Furthermore, the autotrophic denitrification control unit automatically monitors various operating parameters of the A / O reactor, the ANAMMOX reactor and the MBR membrane separation device through monitoring instruments, and automatically controls the switching operating mode according to water quality conditions, and the operating modes include five types.

[0021] Furthermore, the first operation mode is: the sewage enters the A / O reactor and the ANAMMOX reactor respectively in proportion through the water inlet pipeline, the sewage undergoes a thorough full-process aerobic nitrification and anaerobic denitrification reaction in the A / O reactor, the sewage undergoes aerobic partial short-term nitrification reaction in the first reaction zone of ANAMMOX, and the anaerobic ammonium oxidation reaction is carried out in the second reaction zone of ANAMMOX; the second operation mode is: the sewage enters the A / O reactor and the ANAMMOX reactor respectively in proportion through the water inlet pipeline, the sewage undergoes short-term aerobic nitrification and anaerobic denitrification reaction in the A / O reactor, and the sewage undergoes anaerobic ammonium oxidation reaction in the ANAMMOX reactor; the third operation mode is: the sewage enters the A / O reactor respectively in proportion through the water inlet pipeline The sewage undergoes aerobic COD degradation and short-cut aerobic nitrification in the anoxic zone and the aerobic zone of the A / O reactor, and undergoes anaerobic ammonium oxidation in the ANAMMOX reactor. The fourth operation mode is as follows: the sewage enters the A / O reactor (1) entirely, undergoes anaerobic denitrification in the anoxic zone, undergoes aerobic COD degradation and part of a short-cut aerobic nitrification in the aerobic zone, and then enters the ANAMMOX reactor (2) to undergo anaerobic ammonium oxidation. The fifth operation mode is as follows: the sewage enters the A / O reactor (1) entirely, undergoes aerobic COD degradation and part of a short-cut aerobic nitrification in the anoxic zone and the aerobic zone, and then enters the ANAMMOX reactor (2) to undergo anaerobic ammonium oxidation.

[0022] Beneficial effects of the present invention: The present invention can autonomously control and adjust the water inlet ratio and system operating parameters according to changes in sewage quality, realize full-range / short-range nitrification and denitrification coupled anaerobic ammonia oxidation reactions under different operating modes, maximize the removal of ammonia nitrogen and nitrate nitrogen, and achieve the treatment goals of optimal treatment effect and lowest operating consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] The present invention is further described in detail below with reference to the accompanying drawings.

[0025] Figure 1 It is a simplified structural diagram of an integrated autotrophic denitrification treatment system with multiple operation modes according to an embodiment of the present invention;

[0026] Figure 2 is a schematic diagram of the first operating mode described in an embodiment of the present invention;

[0027] Figure 3 is a schematic diagram of the second operating mode described in an embodiment of the present invention;

[0028] Figure 4 is a schematic diagram of the third operating mode described in an embodiment of the present invention;

[0029] Figure 5 is a schematic diagram of the fourth operating mode described in an embodiment of the present invention;

[0030] Figure 6 It is a principle diagram of the fifth operating mode described in an embodiment of the present invention.

[0031] In the figure:

[0032] 1. A / O reactor; 2. ANAMMOX reactor; 3. MBR membrane separation device; 4. Control cabinet; 5. Host computer;

[0033] 101. A / O reactor inlet flowmeter; 102. ANAMMOX reactor inlet flowmeter; 103. Sludge return flowmeter; 104. Nitrification liquid return flowmeter; 105. ORP meter for anoxic zone; 106. DO meter for anoxic zone; 107. pH meter for aerobic zone; 108. DO meter for aerobic zone; 109. Automatic air inlet valve for anoxic zone; 110. Automatic air inlet valve for aerobic zone; 111. Microporous aeration device for anoxic zone; 112. Microporous aeration device for aerobic zone; 113. Submersible agitator; 114. Nitrification liquid return pump; 115. Aeration fan; 116. Heat exchanger; 117. Alkali dosing point;

[0034] 201, DO meter of the first reaction zone; 202, pH meter of the second reaction zone; 203, ORP meter of the second reaction zone; 204, automatic air inlet valve of the first reaction zone; 205, agitator of the first reaction zone; 206, agitator of the second reaction zone; 207, perforated aeration device of the first reaction zone; 208, suspended filler; 209, filler interception device;

[0035] 301. Liquid level meter; 302. Water production pressure sensor; 303. Water production flow meter; 304. MBR membrane assembly; 305. Water production pump; 306. Sludge discharge pump; 307. Sludge return pump. DETAILED DESCRIPTION

[0036] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0037] like Figure 1 As shown, according to the present invention, an integrated autotrophic denitrification treatment system with multiple operation modes is disclosed, including: an A / O reactor 1, an ANAMMOX reactor 2, an MBR membrane separation device 3, and an autotrophic denitrification control unit.

[0038] The A / O reactor 1 comprises an anoxic zone and an aerobic zone. The anoxic zone is equipped with a submersible agitator 113, an anoxic zone microporous aeration device 111, an anoxic zone air intake automatic valve 109, an anoxic zone ORP meter 105, an anoxic zone DO meter, etc.; the aerobic zone is equipped with an aerobic zone microporous aeration device 112, an aerobic zone air intake automatic valve 110, an aerobic zone pH meter 107, an aerobic zone DO meter 108, an alkali addition point 117, a heat exchanger 116, a nitrification liquid reflux pump 114, an aeration fan 115, etc.

[0039] The activated sludge in the A / O reactor coexists with anoxic denitrifying bacteria, aerobic heterotrophic bacteria and aerobic nitrifying bacteria. By adjusting the dissolved oxygen concentration in the reactor, the activity of different types of bacteria is controlled to form a dominant bacterial community, which can effectively achieve the switching of different reaction stages and operation modes such as full / short-term nitrification and denitrification, aerobic degradation of COD, etc. By controlling DO, pH, temperature and other conditions, the short-term nitrification reaction can be stably controlled in the aerobic zone of the A / O reactor or the first reaction zone of the ANAMMOX reactor, thereby achieving the accumulation of nitrite nitrogen and providing sufficient reaction conditions for subsequent anaerobic ammonia oxidation.

[0040] An A / O reactor water inlet flowmeter 101 and an ANAMMOX reactor water inlet flowmeter 102 are respectively arranged on the water inlet pipeline to measure the flow of sewage entering the A / O reactor 1 and the ANAMMOX reactor 2 respectively.

[0041] A sludge return flow meter 103 is provided on the sludge recovery pipeline to measure the sludge return flow from the MBR membrane separation device 3 to the A / O reactor 1 .

[0042] A nitrification liquid reflux pipeline is provided between the aerobic zone and the anoxic zone of the A / O reactor 1. A nitrification liquid reflux flowmeter 104 is provided on the nitrification liquid reflux pipeline. A nitrification liquid reflux pump 114 refluxes the nitrification liquid at the end of the aerobic zone to the front end of the anoxic zone. The nitrification liquid reflux ratio is controlled to be 1 to 5 times of the treated water volume by controlling the operating frequency of the nitrification liquid reflux pump 114, and the temperature of the mixed liquid in the pool can be controlled by the heat exchanger 116.

[0043] The ANAMMOX reactor 2 includes an ANAMMOX first reaction zone and an ANAMMOX second reaction zone. The ANAMMOX first reaction zone is equipped with a first reaction zone agitator 205, a suspended filler 208, a first reaction zone perforated aeration device 207, a first reaction zone air inlet automatic valve 204, a first reaction zone DO meter 201, etc. The ANAMMOX second reaction zone is equipped with a second reaction zone agitator 206, a suspended filler 208, a filler interception device 209, a second reaction zone ORP meter 203, a second reaction zone pH meter 202, etc.

[0044] The MBR membrane separation device 3 is provided with an immersed MBR membrane assembly 304, a produced water pump 305, a sludge discharge pump 306, a sludge return pump 307, a liquid level meter 301, a produced water pressure sensor 302, a produced water flow meter 303, etc.

[0045] The submerged MBR membrane assembly 304 is used to perform membrane filtration separation on mud and water. The produced water is discharged by negative pressure suction through the produced water pump 305. A reflux pipeline is provided between the MBR membrane separation device 3 and the A / O reactor 1. The sludge is refluxed to the front end of the A / O reactor 1 through the sludge reflux pump 307 and the reflux pipeline. The remaining sludge is discharged through the sludge discharge pump 306. Because of the use of adjustable and large-proportion nitrification liquid reflux and sludge reflux, the nitrification liquid reflux and sludge reflux can be freely adjusted according to the operation mode, which can effectively ensure the denitrification efficiency of the A / O reactor and maintain the sludge concentration in the treatment system.

[0046] The autotrophic denitrification control unit includes a control cabinet 4 and a host computer 5. The various operating parameters are automatically monitored by the online monitoring instrument, and the operating mode is automatically controlled and switched according to the water quality conditions. The autotrophic denitrification control unit is used to perform online real-time monitoring of the operating parameters such as pH, ORP, DO, flow, temperature, pressure, liquid level, etc. of the A / O reactor 1, ANAMMOX reactor 2, and MBR membrane separation device 3, and can automatically adjust the automatic valve, and perform automatic control such as variable frequency operation and remote start and stop of equipment such as water pumps, fans, and agitators.

[0047] In one embodiment of the present application, the pH range in the A / O reactor 1 is controlled to be 7.5-8.5, and the temperature range is 30-35°C, and the pH range in the ANAMMOX reactor 2 is controlled to be 6.7-8.3, and the temperature range is 30-37°C.

[0048] In one embodiment of the present application, the ANAMMOX reactor 2 adopts an activated sludge and biofilm (IFAS) symbiotic process, and the anaerobic ammonia oxidizing bacteria are mainly fixed on the suspended filler in the form of a biofilm, which alleviates the problems of easy loss and difficulty in enrichment of the anaerobic ammonia oxidizing bacteria, and can maintain the dominant bacterial flora in an anaerobic environment, thereby improving the removal efficiency and treatment load of the anaerobic ammonia oxidation reaction. The dosing rate of the suspended filler 208 in the first reaction zone of ANAMMOX and the second reaction zone of ANAMMOX is 15% to 50%, the diameter of the filler is 10 to 25 mm, and the specific surface area is ≥850m 2 / m 3 The suspended filler 208 is in a fluidized state in the ANAMMOX reactor 2 under the action of the agitator 205 in the first reaction zone and the agitator 206 in the second reaction zone, and a filler interception device 209 is provided at the water outlet of the second reaction zone.

[0049] In one embodiment of the present application, the first reaction zone agitator 205 and the second reaction zone agitator 206 of the ANAMMOX reactor 2 are both vertical liftable paddle agitators, with a circulation ratio of ≥50 and an upward flow rate of ≥0.05 m / s.

[0050] In one embodiment of the present application, the MBR membrane separation device 3 adopts an immersed hollow fiber MBR membrane module 304 with a filtration accuracy of 0.04 to 0.1 μm. The water production method is intermittent negative pressure suction by the water production pump 305, and the operation cycle is 8 to 10 minutes of suction and 1 to 2 minutes of stop.

[0051] In one embodiment of the present application, the sludge return pump 307 works in conjunction with the sludge return flowmeter 103 to control the return ratio to 5 to 10 times the treated water volume by controlling the operating frequency of the sludge return pump 307, and the return point is the water inlet end from the MBR membrane separation device 3 to the A / O reactor 1.

[0052] In one embodiment of the present application, the nitrification liquid reflux pump 114 works in conjunction with the nitrification liquid reflux flowmeter 104. The nitrification liquid reflux pump 114 refluxes the nitrification liquid at the end of the aerobic zone to the front end of the anoxic zone, controls the nitrification liquid reflux ratio to be 1 to 5 times the amount of treated water by controlling the operating frequency of the nitrification liquid reflux pump 114, and controls the temperature of the mixed liquid in the pool through the heat exchanger 116.

[0053] In one embodiment of the present application, the anoxic zone air inlet automatic valve 109 works in conjunction with the anoxic zone DO instrument 106, the aerobic zone air inlet automatic valve 110 works in conjunction with the aerobic zone DO instrument 108, and the first reaction zone air inlet automatic valve 204 works in conjunction with the first reaction zone DO instrument 201. The opening of the air inlet automatic valve is automatically controlled by the autotrophic denitrification control unit to achieve control of the DO concentration in the reactor.

[0054] In one embodiment of the present application, the aeration fan 115 works together with the anoxic zone DO meter 106, the aerobic zone DO meter 108, and the first reaction zone DO meter 201, and the autotrophic denitrification control unit automatically controls the operating frequency of the aeration fan 115 to control the DO concentration in the reactor.

[0055] In one embodiment of the present application, the aerobic zone pH meter 107 and the second reaction zone pH meter 202 monitor the pH value in the reactor, the anoxic zone ORP meter 105 and the second reaction zone ORP meter 203 monitor the redox potential in the reactor, and are electrically connected to the autotrophic denitrification control unit.

[0056] In one embodiment of the present application, the water production pump 305 works together with the liquid level meter 301, the water production pressure sensor 302, and the water production flow meter 303, and the operation cycle of the water production pump 305 is controlled by the autotrophic denitrification control unit.

[0057] In one embodiment of the present application, the autotrophic denitrification control unit can automatically control the switching of the operation mode of the integrated autotrophic denitrification treatment system according to the water quality conditions by adjusting operating parameters such as proportional water inlet or full water inlet, whether the anoxic zone of the A / O reactor 1 and the first reaction zone of the ANAMMOX reactor 2 are aerated, and the nitrification liquid reflux of the A / O reactor 1, so as to realize the full / short-term nitrification and denitrification coupled anaerobic ammonia oxidation reaction under different operation modes, maximize the removal of ammonia nitrogen and nitrate nitrogen, and achieve the treatment goals of optimal treatment effect and lowest operation consumption. The specific operation modes are as follows:

[0058] When the proportion of nitrate nitrogen in the influent is high, the operation mode of full nitrification and denitrification coupled with partial short-cut nitrification and anaerobic ammonium oxidation (the first operation mode) can be adopted: a part of the sewage undergoes full nitrification and denitrification reactions in the A / O reactor to minimize the total nitrogen concentration in the effluent of the A / O reactor, and then is mixed with the remaining sewage and undergoes partial short-cut nitrification reactions in the first reaction zone of the ANMMOX reactor to accumulate the nitrite nitrogen necessary for the anaerobic ammonium oxidation reaction in the second reaction zone of the ANMMOX reactor;

[0059] When the ammonia nitrogen concentration in the influent is high, the operation mode of denitrification and short-cut nitrification coupled with anaerobic ammonium oxidation (the second operation mode) can be adopted: a part of the sewage undergoes anoxic denitrification reaction in the anoxic zone of the A / O reactor to remove nitrate nitrogen, and a short-cut nitrification reaction is carried out in the aerobic zone to achieve the accumulation of nitrite nitrogen, and then an anaerobic ammonium oxidation reaction is carried out with the ammonia nitrogen in the remaining sewage in the ANAMMOX reactor;

[0060] When the COD concentration in the influent is high, the operation mode of carbon oxidation and short-cut nitrification coupled with anaerobic ammonium oxidation (the third operation mode) can be adopted: a part of the sewage is aerobically aerated in the anoxic zone of the A / O reactor to pre-degrade the COD in the wastewater, so as to maintain the nitrifying bacteria in the aerobic zone as the dominant bacteria, and a short-cut nitrification reaction is carried out in the aerobic zone to achieve the accumulation of nitrite nitrogen, and then the anaerobic ammonium oxidation reaction is carried out with the ammonia nitrogen in the remaining sewage in the ANAMMOX reactor;

[0061] When the concentrations of nitrate nitrogen and ammonia nitrogen in the influent are both high, the operation mode of denitrification and partial short-cut nitrification coupled with anaerobic ammonium oxidation (the fourth operation mode) can be adopted: all sewage enters the A / O reactor, anoxic denitrification is carried out in the anoxic zone, partial short-cut nitrification is carried out in the aerobic zone, the ratio of ammonia nitrogen and nitrite nitrogen in the effluent of the A / O reactor is controlled, and then anaerobic ammonium oxidation is carried out in the ANAMMOX reactor;

[0062] When the COD and ammonia nitrogen concentrations in the influent are high, the operation mode of carbon oxidation and partial short-term nitrification coupled with anaerobic ammonia oxidation (the fifth operation mode) can be adopted: all sewage enters the A / O reactor, and aerobic aeration is carried out in the anoxic zone to pre-degrade the COD in the wastewater to maintain the nitrifying bacteria in the aerobic zone as the dominant species, and partial short-term nitrification reaction is carried out in the aerobic zone to control the ratio of ammonia nitrogen and nitrite nitrogen in the effluent of the A / O reactor, and then anaerobic ammonia oxidation reaction is carried out in the ANMMOX reactor.

[0063] The specific operating modes and operating conditions are as follows:

[0064] like Figure 2As shown, when the proportion of nitrate nitrogen in the influent is high (for example, the water quality index requirements set in this treatment system are: COD≤10000mg / L, ammonia nitrogen≤1000mg / L, 100mg / L<nitrate nitrogen≤1500mg / L, organic nitrogen≤500mg / L, total nitrogen≤3000mg / L), the full nitrification and denitrification coupled with partial short-term nitrification and anaerobic ammonia oxidation can be adopted. The sewage enters the A / O reactor 1 and the ANAMMOX reactor 2 respectively in proportion through the water inlet pipeline. In this operation mode: a part of the sewage undergoes thorough aerobic nitrification and anaerobic denitrification reactions in the A / O reactor 1, and the effluent TN is controlled to be ≤500 mg / L; the sewage undergoes aerobic partial short-range nitrification reaction in the ANAMMOX first reaction zone of the ANAMMOX reactor 2, and the nitrite rate is controlled to be 50%-70%; anaerobic ammonium oxidation reaction is carried out in the ANAMMOX second reaction zone of the ANAMMOX reactor 2, and the molar ratio of nitrite / ammonia in the inlet is controlled to be 1.0-1.5. The specific operating parameters are as follows: the inlet ratio of A / O reactor 1 and ANAMMOX reactor 2 is 2-5:1; DO in the anoxic zone of A / O reactor 1 is ≤0.2 mg / L, and DO in the aerobic zone is 0.5-2.0 mg / L; DO in the first reaction zone of ANAMMOX reactor 2 is 0.5-0.8 mg / L, and DO in the second reaction zone is ≤0.05 mg / L; the nitrification solution return ratio is 3-5:1, and the sludge return ratio is 5-10:1.

[0065] like Figure 3 As shown, when the ammonia nitrogen concentration in the influent is high (for example, the water quality index requirements set in this treatment system are: COD≤10000mg / L, 1000mg / L<ammonia nitrogen≤2500mg / L, nitrate nitrogen≤100mg / L, organic nitrogen≤400mg / L, total nitrogen≤3000mg / L), denitrification and short-cut nitrification coupled anaerobic ammonium oxidation can be used. The sewage enters the A / O reactor 1 and the ANAMMOX reactor 2 in proportion through the inlet pipeline. In this operation mode: a part of the sewage undergoes short-cut aerobic nitrification and anaerobic denitrification reactions in the A / O reactor 1, and the nitrite rate is controlled to be ≥80%, and the effluent TN is ≤300mg / L; the sewage undergoes anaerobic ammonium oxidation reaction in the ANAMMOX reactor, and the molar ratio of nitrite / ammonia in the influent is controlled to be 1.0-1.5. The specific operating parameters are as follows: the inlet ratio of A / O reactor 1 and ANAMMOX reactor 2 is 1.5-3:1; DO in the anoxic zone of A / O reactor 1 is ≤0.2 mg / L, and DO in the aerobic zone is 0.5-0.8 mg / L; DO in ANAMMOX reactor 2 is ≤0.05 mg / L; the nitrification solution return ratio is 1-3:1, and the sludge return ratio is 5-10:1.

[0066] like Figure 4As shown, when the COD concentration in the influent is high (for example, the water quality index requirements set in this treatment system are: 10000mg / L<COD≤15000mg / L, ammonia nitrogen≤1000mg / L, nitrate nitrogen≤100mg / L, organic nitrogen≤400mg / L, total nitrogen≤1500mg / L), carbon oxidation and short-range nitrification coupled anaerobic ammonium oxidation can be used. The sewage enters the A / O reactor 1 and the ANAMMOX reactor 2 in proportion through the inlet pipeline. In this operation mode: a part of the sewage undergoes aerobic COD degradation and short-range aerobic nitrification in the anoxic zone and aerobic zone of the A / O reactor 1, and the nitrite rate is controlled to be ≥80%, and the effluent TN is ≤300mg / L; the sewage undergoes anaerobic ammonium oxidation in the ANAMMOX reactor, and the molar ratio of nitrite / ammonia in the influent is controlled to be 1.0-1.5. The specific operating parameters are as follows: the inlet ratio of A / O reactor 1 and ANAMMOX reactor 2 is 1.5-3:1; the DO in the anoxic zone of A / O reactor 1 is 2.0-4.0 mg / L, and the DO in the aerobic zone is 0.5-2.0 mg / L; the DO in ANAMMOX reactor 2 is ≤0.05 mg / L; the nitrification solution return ratio is 1-3:1, and the sludge return ratio is 5-10:1.

[0067] like Figure 5 As shown, when the concentrations of nitrate nitrogen and ammonia nitrogen in the influent are both high (for example, the water quality index requirements set in this treatment system are: COD≤10000mg / L, 1000mg / L<ammonia nitrogen≤1500mg / L, 100mg / L<nitrate nitrogen≤1400mg / L, organic nitrogen≤100mg / L, total nitrogen≤3000mg / L), denitrification and partial short-cut nitrification coupled anaerobic ammonium oxidation can be used. All sewage enters A / O reactor 1. In this operation mode: sewage undergoes anaerobic denitrification in the anoxic zone, aerobic COD degradation and partial short-cut aerobic nitrification in the aerobic zone, and the nitrite rate is controlled to be 50%-70%, and the effluent TN≤500mg / L; then it enters ANAMMOX reactor 2 for anaerobic ammonium oxidation, and the molar ratio of influent nitrite / ammonia is controlled to be 1.0-1.5. The specific operating parameters are as follows: DO in the anoxic zone of A / O reactor 1 is ≤0.2 mg / L, and DO in the aerobic zone is 0.5-0.8 mg / L; DO in ANAMMOX reactor 2 is ≤0.05 mg / L; the nitrification liquid return ratio is 1-3:1, and the sludge return ratio is 5-10:1.

[0068] like Figure 6As shown, when the COD and ammonia nitrogen concentrations in the influent are both high (for example, the water quality index requirements set in this treatment system are: 10000mg / L<COD≤15000mg / L, 1000mg / L<ammonia nitrogen≤2500mg / L, nitrate nitrogen≤100mg / L, organic nitrogen≤400mg / L, total nitrogen≤3000mg / L), carbon oxidation and partial short-range nitrification coupled anaerobic ammonia oxidation can be used. All sewage enters A / O reactor 1. In this operation mode: sewage undergoes aerobic COD degradation and partial short-range aerobic nitrification in the anoxic zone and aerobic zone, and the nitrite rate is controlled to be 50%-70%, and the effluent TN≤500mg / L; then enters ANAMMOX reactor 2 for anaerobic ammonia oxidation reaction, and the molar ratio of nitrite / ammonia in the influent is controlled to be 1.0-1.5. The specific operating parameters are as follows: DO in the anoxic zone of A / O reactor 1 is 2.0-4.0 mg / L, and DO in the aerobic zone is 0.5-2.0 mg / L; DO in ANAMMOX reactor 2 is ≤0.05 mg / L; nitrification liquid return ratio is 1-3:1, and sludge return ratio is 5-10:1.

[0069] After the above experiment, the effluent treated by the integrated autotrophic denitrification system was tested and the COD removal rate was ≥97%, NH4 + -N removal rate ≥99.8%, TN removal rate ≥97.5%. The effluent quality can meet the B-level standard of "Water Quality Standard for Sewage Discharge into Urban Sewers" (GB / T31962-2015): COD≤500mg / L, BOD5≤350mg / L, suspended solids≤400mg / L, ammonia nitrogen≤45mg / L, total nitrogen≤70mg / L.

[0070] The integrated autotrophic nitrogen removal system under multiple operation modes organically combines the full / short-term nitrification technology and anaerobic ammonium oxidation technology, while having the advantages of full / short-term nitrification and anaerobic ammonium oxidation, and realizes the complementarity between various technologies.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An integrated autotrophic denitrification treatment system with multiple operation modes, characterized in that: include: An A / O reactor (1), the A / O reactor (1) comprising an anoxic zone and an aerobic zone, the anoxic zone being provided with an anoxic zone microporous aeration device (111), an anoxic zone ORP meter (105), an anoxic zone DO meter (106), and a submersible agitator (113), the aerobic zone being provided with an aerobic zone microporous aeration device (112), an aerobic zone pH meter (107), and an aerobic zone DO meter (108), the aerobic zone being further provided with an alkali dosing point (117), and a nitrification liquid reflux unit being connected between the aerobic zone and the anoxic zone; an ANAMMOX reactor (2) connected to the A / O reactor (1), the ANAMMOX reactor (2) comprising an ANAMMOX first reaction zone and an ANAMMOX second reaction zone, wherein the ANAMMOX first reaction zone and the ANAMMOX second reaction zone are both provided with suspended fillers (208), the ANAMMOX first reaction zone is also provided with a first reaction zone perforated aeration device (207), a first reaction zone agitator (205), and a first reaction zone DO meter (201), and the ANAMMOX second reaction zone is also provided with a second reaction zone pH meter (202), a second reaction zone ORP meter (203), and a second reaction zone agitator (206); An MBR membrane separation device (3) connected to the ANAMMOX reactor (2), wherein the MBR membrane separation device (3) is provided with an MBR membrane assembly (304), and the MBR membrane separation device (3) is also connected to a water production unit and a sludge treatment unit; An autotrophic denitrification control unit for controlling the A / O reactor (1), the ANAMMOX reactor (2), and the MBR membrane separation device (3); The A / O reactor (1) and the ANAMMOX reactor (2) are connected to the sewage water inlet end through the first water delivery component and the second water delivery component respectively; An anoxic zone air inlet automatic valve (109), an aerobic zone air inlet automatic valve (110), and a first reaction zone air inlet automatic valve (204) are respectively provided on the input pipeline of the anoxic zone microporous aeration device (111), the input pipeline of the aerobic zone microporous aeration device (112), and the input pipeline of the first reaction zone perforated aeration device (207); The nitrification liquid reflux unit comprises a nitrification liquid reflux pipeline connecting the anoxic zone and the aerobic zone, wherein the nitrification liquid reflux pipeline is provided with a nitrification liquid reflux pump (114), a heat exchanger (116), and a nitrification liquid reflux flowmeter (104) in sequence; The first water delivery component is connected to an A / O reactor water inlet flow meter (101) and a first water inlet control valve, and the second water delivery component is connected to an ANAMMOX reactor water inlet flow meter (102) and a second water inlet control valve; The sludge treatment unit comprises a sludge discharge pipeline and a sludge recovery pipeline connected to the MBR membrane separation device (3), the sludge discharge pipeline is provided with a sludge discharge pump (306), the sludge recovery pipeline is provided with a sludge return pump (307) and a sludge return flow meter (103) in sequence, and the output end of the sludge recovery pipeline is connected to the A / O reactor (1); The autotrophic denitrification control unit automatically monitors various operating parameters of the A / O reactor (1), the ANAMMOX reactor (2) and the MBR membrane separation device (3) through a monitoring instrument, and automatically controls the switching of operating modes according to water quality conditions. The first operating mode is: the sewage enters the A / O reactor (1) and the ANAMMOX reactor (2) respectively in proportion through the water inlet pipeline, and the sewage undergoes a thorough full-process aerobic nitrification and anaerobic denitrification reaction in the A / O reactor (1), the sewage undergoes an aerobic partial short-cut nitrification reaction in the ANAMMOX first reaction zone, and an anaerobic ammonium oxidation reaction in the ANAMMOX second reaction zone; the second operating mode is: the sewage enters the A / O reactor (1) and the ANAMMOX reactor (2) respectively in proportion through the water inlet pipeline, and the sewage undergoes a short-cut aerobic nitrification and anaerobic denitrification reaction in the A / O reactor (1), and the sewage undergoes a partial aerobic short-cut nitrification reaction in the ANAMMOX first reaction zone. The third operation mode is as follows: the sewage enters the A / O reactor (1) and the ANAMMOX reactor (2) respectively in proportion through the water inlet pipe, the sewage undergoes aerobic COD degradation and short-range aerobic nitrification reaction in the anoxic zone and the aerobic zone of the A / O reactor (1), and the sewage undergoes anaerobic ammonium oxidation reaction in the ANAMMOX reactor (2); the fourth operation mode is as follows: the sewage enters the A / O reactor (1), the sewage undergoes anaerobic denitrification reaction in the anoxic zone, aerobic COD degradation and partial short-range aerobic nitrification reaction in the aerobic zone, and then enters the ANAMMOX reactor (2) for anaerobic ammonium oxidation reaction; the fifth operation mode is as follows: the sewage enters the A / O reactor (1), the sewage undergoes aerobic COD degradation and partial short-range aerobic nitrification reaction in the anoxic zone and the aerobic zone, and then enters the ANAMMOX reactor (2) for anaerobic ammonium oxidation reaction; The specific operating parameters of the first mode are as follows: the water inlet ratio of the A / O reactor (1) and the ANAMMOX reactor (2) is 2-5:1; the DO in the anoxic zone of the A / O reactor (1) is ≤0.2 mg / L, and the DO in the aerobic zone is 0.5-2.0 mg / L; the DO in the first reaction zone of the ANAMMOX reactor (2) is 0.5-0.8 mg / L, and the DO in the second reaction zone is ≤0.05 mg / L; the nitrification solution return ratio is 3-5:1, and the sludge return ratio is 5-10:1; The specific operating parameters of the second mode are as follows: the influent ratio of the A / O reactor (1) and the ANAMMOX reactor (2) is 1.5-3:1; the DO in the anoxic zone of the A / O reactor (1) is ≤0.2 mg / L, and the DO in the aerobic zone is 0.5-0.8 mg / L; the DO in the ANAMMOX reactor (2) is ≤0.05 mg / L; the nitrification solution return ratio is 1-3:1, and the sludge return ratio is 5-10:1; The specific operating parameters of the third mode are as follows: the influent ratio of the A / O reactor (1) and the ANAMMOX reactor (2) is 1.5-3:1; the DO in the anoxic zone of the A / O reactor (1) is 2.0-4.0 mg / L, and the DO in the aerobic zone is 0.5-2.0 mg / L; the DO in the ANAMMOX reactor (2) is ≤0.05 mg / L; the nitrification solution return ratio is 1-3:1, and the sludge return ratio is 5-10:1; The specific operating parameters of the fourth mode are as follows: DO in the anoxic zone of the A / O reactor (1) is ≤0.2 mg / L, and DO in the aerobic zone is 0.5-0.8 mg / L; DO in the ANAMMOX reactor (2) is ≤0.05 mg / L; the nitrification solution return ratio is 1-3:1, and the sludge return ratio is 5-10:1; The specific operating parameters of the fifth mode are as follows: the DO in the anoxic zone of the A / O reactor (1) is 2.0-4.0 mg / L, and the DO in the aerobic zone is 0.5-2.0 mg / L; the DO in the ANAMMOX reactor (2) is ≤0.05 mg / L; the nitrification solution return ratio is 1-3:1, and the sludge return ratio is 5-10:

1.

2. The integrated autotrophic denitrification treatment system with multiple operation modes according to claim 1, characterized in that: The anoxic zone microporous aeration device (111), the aerobic zone microporous aeration device (112), the first reaction zone perforated aeration device (207), and the MBR membrane assembly (304) are all connected to an aeration fan (115).

3. The integrated autotrophic denitrification treatment system with multiple operation modes according to claim 1, characterized in that: The water production unit comprises a water production pipeline connected to the MBR membrane separation device (3), wherein a water production pressure sensor (302), a water production pump (305), and a water production flow meter (303) are sequentially arranged on the water production pipeline, and the water production unit also comprises a liquid level meter (301) arranged in the MBR membrane separation device (3).

4. The integrated autotrophic denitrification treatment system with multiple operation modes according to claim 1, characterized in that: The autotrophic denitrification control unit comprises a control cabinet (4), a host computer (5) communicatively connected to the control cabinet (4), and an instrument for monitoring the A / O reactor (1), an instrument for monitoring the ANAMMOX reactor (2), and an instrument for monitoring the MBR membrane separation device (3) are all electrically connected to the control cabinet (4).

5. The integrated autotrophic denitrification treatment system with multiple operation modes according to claim 1, characterized in that: The first reaction zone agitator (205) and the second reaction zone agitator (206) are both vertical liftable paddle agitators, with a circulation ratio of ≥50 and an upward flow rate of ≥0.05 m / s.

Images