Decarbonization and nitrogen removal reactor for removing microbial metabolites from wastewater

Abstract

The present invention provides a decarbonization and denitrification reactor for removing microbial metabolites in sewage, belonging to the field of sewage treatment. The reactor comprises an anaerobic microbial extracellular enzyme hydrolysis unit, an anaerobic decarbonization and denitrification filler layer unit, a secondary denitrification unit, an aerobic nitrification unit and an activated sludge separation unit which are sequentially connected, and the activated sludge separation unit is connected to the anaerobic microbial extracellular enzyme hydrolysis unit, so that when the nitrified liquid after aerobic treatment flows back to the anaerobic treatment part, the microbial metabolites can be removed, thereby enhancing the overall organic matter removal effect of the process.

Description

Technical Field

[0001] The invention belongs to the field of sewage treatment, and in particular relates to a decarbonization and denitrification reactor for removing microbial metabolites in sewage. Background Art

[0002] In the effluent from biological treatment of sewage (wastewater), a considerable amount of microbial metabolites inevitably remain. This phenomenon is particularly evident in the biological treatment process of high-carbon (organic matter) and high-nitrogen wastewater. The residual microbial metabolites in the effluent make it difficult for such sewage to meet discharge standards. In order to meet discharge standards, it is often necessary to add deep treatment technical links such as activated carbon adsorption, Fenton oxidation, electrochemical treatment, and ozone treatment, or to add membrane treatment as a guarantee link, thereby increasing the technical difficulty and economic cost of meeting discharge standards for such sewage. Moreover, these microbial metabolites may also produce unknown disinfection by-products during subsequent treatment, and may also cause contamination of membrane treatment equipment. Therefore, reducing the microbial metabolites in the treated effluent is a bottleneck for increasing the efficiency of biological sewage treatment.

[0003] Controlling parameters such as sludge age, hydraulic retention time, and bioreactor temperature in traditional aerobic activated sludge processes can control the production of microbial metabolites. However, altering these process parameters conflicts with the enrichment of nitrifying microorganisms, making them difficult to apply in actual wastewater biological treatment. Although advanced oxidation technology [Chinese Invention Patent, Electrochemical Wastewater Treatment Equipment, Publication No.: CN210313653U] can treat these difficult-to-biodegrade microbial metabolites, large-scale operation is difficult due to issues such as catalyst loss, short electrode life, poor selectivity, and high operating costs. Summary of the Invention

[0004] To solve the above problems, a decarbonization and denitrification reactor for removing microbial metabolites in sewage is provided, which is used to remove easily degradable organic matter, nitrogen pollutants and newly generated microbial metabolites in the biochemical treatment process in sewage. The present invention adopts the following technical solutions:

[0005] The present invention provides a decarbonization and denitrification reactor for removing microbial metabolites in sewage, characterized in that it comprises: an anaerobic treatment device, comprising an anaerobic shell and an anaerobic microbial extracellular enzyme hydrolysis unit, an anaerobic decarbonization and denitrification filler layer unit and a secondary denitrification unit that are sequentially connected; and an aerobic treatment device, comprising an aerobic shell and an aerobic nitrification unit and an activated sludge separation unit that are connected, wherein the aerobic shell is connected to the anaerobic shell, an anaerobic partition, a lower grid plate and an upper grid plate are arranged in the anaerobic shell, and the anaerobic partition is vertically arranged between one end of the upper grid plate and one end of the lower grid plate The bottom end of the anaerobic partition is connected to the bottom of the anaerobic shell, and its top end is higher than the upper grid plate. The space formed by the anaerobic partition, the lower grid plate and the bottom of the anaerobic shell is used to place the hydrolyzed sludge, which is used as an anaerobic microbial extracellular enzyme hydrolysis unit. The space formed by the anaerobic partition, the lower grid plate and the upper grid plate is used to place the filler, which is used as an anaerobic decarbonization and nitrogen removal filler layer unit. The space formed by the anaerobic partition and the anaerobic shell is used to place the denitrification sludge, which is used as a secondary denitrification unit. The aerobic nitrification unit is connected to the secondary denitrification unit, and the activated sludge separation unit is connected to the anaerobic microbial extracellular enzyme hydrolysis unit.

[0006] The decarbonization and denitrification reactor for removing microbial metabolites in sewage provided by the present invention may also have the following characteristics: the anaerobic treatment device also has an anaerobic shell, in which an anaerobic partition, a lower grid plate and an upper grid plate are arranged; the anaerobic partition is vertically arranged between one end of the upper grid plate and one end of the lower grid plate; the bottom end of the anaerobic partition is connected to the bottom of the anaerobic shell, and the top end thereof is higher than the upper grid plate; the space formed by the anaerobic partition, the lower grid plate and the bottom of the anaerobic shell is used for placing hydrolyzed sludge, and is used as an anaerobic microbial extracellular enzyme hydrolysis unit; the space formed by the anaerobic partition, the lower grid plate and the upper grid plate is used for placing filler, and is used as an anaerobic decarbonization and denitrification filler layer unit; the space formed by the anaerobic partition and the anaerobic shell is used for placing denitrified sludge, and is used as a secondary denitrification unit.

[0007] The decarbonization and denitrification reactor for removing microbial metabolites in sewage provided by the present invention may also have the following characteristics: the upper grid plate and the lower grid plate are connected between the anaerobic shell and the anaerobic partition through a support, the mesh size of the upper grid plate and the lower grid plate are both 1.0 cm×1.0 cm, the materials used for the upper grid plate and the lower grid plate are both fiberglass, polyvinyl chloride or polyethylene, the support is a right triangle with an acute angle of 30-45°, the thickness of the support is 0.5-5 cm, and the material of the support is polyvinyl chloride or polyethylene.

[0008] The decarbonization and denitrification reactor for removing microbial metabolites in sewage provided by the present invention may also have the following characteristics: the layer height of the anaerobic microbial extracellular enzyme hydrolysis unit is 0.10-1.5m, and its volume is 8-24% of the total volume of the anaerobic shell; the layer height of the anaerobic decarbonization and denitrification filler layer unit is 0.3-2.8m, and its volume is 70-90% of the total volume of the anaerobic shell.

[0009] The decarbonization and denitrification reactor for removing microbial metabolites in sewage provided by the present invention may also have the following characteristics: the anaerobic microbial extracellular enzyme hydrolysis unit further has a sewage feed pipe and a circulation feed pipe, the total solid concentration of the hydrolyzed sludge is 10-30 g / L, and the control areas of the sewage feed pipe and the circulation feed pipe are both 0.3-1.2 m 2 The sewage feed pipe is used to discharge the sewage to be treated, and the circulating feed pipe is used to discharge the sewage treated by the activated sludge separation unit. The ratio of the sewage to be treated to the sewage treated by the activated sludge separation unit is 1:25-1:2. The anaerobic microbial extracellular enzyme hydrolysis unit adopts semi-continuous water inlet, and the water inlet time is 1 / 10-1 / 2 of the total operating time of the reactor. The time interval for the sewage to be treated to be discharged after being treated by the activated sludge separation unit is 1 / 20000-1 / 1000 of the total operating time of the reactor.

[0010] The decarbonization and denitrification reactor for removing microbial metabolites in sewage provided by the present invention may also have the following characteristics: the specific surface area of the filler is 300-700m 2 / m 3 The layer height is 0.5-3.5m, and the filler material is polyethylene or polyvinyl chloride.

[0011] The decarbonization and denitrification reactor for removing microbial metabolites in sewage provided by the present invention may also have the following characteristics: a biofilm is attached to the filler, the biofilm thickness is 0.3-2 mm, the outer layer of the biofilm is microorganisms with denitrification, short-range denitrification and acid production functions, and the inner layer is microorganisms with methane production function.

[0012] The decarbonization and denitrification reactor for removing microbial metabolites in sewage provided by the present invention may also have the following characteristics: the secondary denitrification unit includes a submerged outlet pipe and an anaerobic emptying pipe, the total solid concentration of the denitrification sludge is 0.5-6g / L, the submerged depth of the submerged outlet pipe is 0.5-1.2m, and it is used to connect to the aerobic nitrification unit. The distance between the submerged outlet pipe and the top of the anaerobic shell is 0.2-0.6m.

[0013] The decarbonization and denitrification reactor for removing microbial metabolites in sewage provided by the present invention may also have the following characteristics: the aerobic shell has an aerobic partition and a first connecting port connected to the circulating feed pipe, one side of the aerobic partition is an aerobic nitrification unit, and the other side is an activated sludge separation unit. The aerobic partition has a second connecting port, which is used to connect the aerobic nitrification unit and the activated sludge separation unit.

[0014] The decarbonization and denitrification reactor for removing microbial metabolites in sewage provided by the present invention may also have the following characteristics: the aerobic nitrification unit comprises nitrification sludge, volatile solids, a water inlet pipe, an aerobic emptying pipe, an aerator, and a fender; the total solid concentration of the nitrification sludge is 0.5-3 g / L or 15-25 g / L; the sludge age is 20-25 days; the ratio of the concentration of volatile solids to the total solid concentration of the nitrification sludge is 0.3-0.55; the water inlet is 100-250 ... The pipe is located above the aerobic shell and is connected to the submerged outlet pipe of the secondary denitrification unit. The water inlet pipe is located on the same horizontal plane as the first connecting port and the second connecting port. The aerator is a jet aerator or a disc aerator. The height of the mud guard is 10-30 cm higher than the second connecting port. The dihedral angle formed by the mud guard and the bottom surface of the aerobic shell is 70-90 degrees. The distance between the mud guard and the bottom surface of the aerobic shell is 15-35 cm. The length of the mud guard is 0-12.6 m.

[0015] The decarbonization and denitrification reactor for removing microbial metabolites in sewage provided by the present invention may also have the following characteristics, wherein the activated sludge separation unit is a sedimentation tank or an external ultrafiltration membrane, and the sedimentation tank is a horizontal flow sedimentation tank or a vertical flow sedimentation tank.

[0016] Functions and effects of the invention

[0017] According to the present invention, the decarbonization and denitrification reactor for removing microbial metabolites in sewage is connected in sequence to an anaerobic microbial extracellular enzyme hydrolysis unit, an anaerobic decarbonization and denitrification filler layer unit, a secondary denitrification unit, an aerobic nitrification unit, and an activated sludge separation unit, and the activated sludge separation unit is connected to the anaerobic microbial extracellular enzyme hydrolysis unit. When the nitrified liquid after aerobic treatment is returned to the anaerobic treatment device, the microbial metabolites can be removed, thereby enhancing the overall organic matter removal effect of the process. By returning the nitrified liquid after aerobic treatment to the anaerobic treatment device again, decarbonization and denitrification can be achieved, and the high concentration of organic matter in the influent can be diluted to alleviate the shock load; therefore, the anaerobic reactor does not require internal circulation, which can save the energy consumption of the internal circulation pump and save more than 1 / 3 of the energy consumption compared to similar processes. At the same time, the amount of inorganic carbon in the nitrified liquid after aerobic treatment is lower than the inorganic carbon in the anaerobic reactor, which is conducive to controlling the scaling problem of the anaerobic reactor and can reduce the scaling rate by 4 times. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the structure of the anaerobic treatment device in Example 1 of the present invention;

[0019] Figure 2 Schematic diagram of the structure of the aerobic treatment device in Example 1 of the present invention;

[0020] Figure 3 This is a molecular information analysis diagram based on high-resolution mass spectrometry of dissolved organic matter in Example 1 of the present invention. DETAILED DESCRIPTION

[0021] The specific implementation of the present invention is described below with reference to the accompanying drawings and embodiments.

[0022] <Example 1>

[0023] This embodiment provides a decarbonization and denitrification reactor 100 for removing microbial metabolites in sewage, which is used to remove easily degradable organic matter, nitrogen pollutants, and newly generated microbial metabolites during the biochemical treatment process in sewage.

[0024] The decarbonization and denitrification reactor 100 of this embodiment includes an anaerobic treatment device 10 and an aerobic treatment device 20 .

[0025] Figure 1 It is a structural schematic diagram of an anaerobic treatment device in an embodiment of the present invention.

[0026] like Figure 1 As shown, the anaerobic treatment device 10 comprises an anaerobic shell 11 , an anaerobic microbial extracellular enzyme hydrolysis unit 12 , an anaerobic decarbonization and denitrification filler layer unit 13 and a secondary denitrification unit 14 which are sequentially connected.

[0027] The anaerobic housing 11 is equipped with an anaerobic baffle 111, a lower grid plate 112, an upper grid plate 113, a support 114, and a biogas conduit 115. The anaerobic baffle 111 is vertically positioned between one end of the upper grid plate 113 and one end of the lower grid plate 332. The bottom end of the anaerobic baffle 111 is connected to the bottom of the anaerobic housing 11, and its top end is higher than the upper grid plate 113. The lower grid plate 112 and the upper grid plate 113 are connected between the anaerobic housing 11 and the anaerobic baffle 111 via the support 114. The space formed by the anaerobic baffle 111, the lower grid plate 112, and the bottom of the anaerobic housing 11 is used to store hydrolyzed sludge, serving as the anaerobic microbial extracellular enzyme hydrolysis unit 12. The space formed by the anaerobic baffle 111, lower grid plate 112, and upper grid plate 113 is used to accommodate filler, serving as the anaerobic decarbonization and denitrification filler layer unit 13. The space formed by the anaerobic baffle 111 and the anaerobic housing 11 is used to accommodate denitrified sludge, serving as the secondary denitrification unit 14. A biogas conduit 115, located above the anaerobic housing 11, collects the biogas produced by the anaerobic decarbonization and denitrification filler layer unit 13. The lower grid plate 112 and upper grid plate 113 measure 1.0 cm x 1.0 cm and are made of fiberglass. The support 114 is a right triangle with a 30° acute angle and is 1.3 cm thick. It is made of high-density polyethylene.

[0028] The anaerobic microbial extracellular enzyme hydrolysis unit 12 is located at the bottom of the anaerobic shell 11. The floor height of the anaerobic microbial extracellular enzyme hydrolysis unit 12 is 0.8m, and the volume is 24% of the total volume of the anaerobic treatment device 10. The anaerobic microbial extracellular enzyme hydrolysis unit 12 has a sewage feed pipe 121 and a circulation feed pipe 122. The control area of the sewage feed pipe 121 and the circulation feed pipe 122 are both 1.2m2. The total solids (TS) concentration of the hydrolyzed sludge in the anaerobic microbial extracellular enzyme hydrolysis unit 12 is 29g / L. The sewage feed pipe 121 is used to discharge sewage to be treated, and the circulation feed pipe 122 is used to discharge sewage treated by the activated sludge separation unit. The ratio of sewage to be treated to sewage treated by the activated sludge separation unit is 1:6.

[0029] The anaerobic decarbonization and denitrification packing layer unit 13 is located above the anaerobic microbial extracellular enzyme hydrolysis unit 12. The height of the anaerobic decarbonization and denitrification packing layer unit 13 is 0.3-2.8m, the distance between the lower grid plate 112 and the upper grid plate 113 is 1.4m, and its volume is 70% of the total volume of the anaerobic treatment device 10. The packing in the anaerobic decarbonization and denitrification packing layer unit 13 is polyethylene packing with a specific surface area of 300m 2 / m 3 The filler is attached with a biofilm with a thickness of 1-1.5 mm. The outer layer of the biofilm can be microorganisms with denitrification, short-range denitrification and acid production functions, and the inner layer is microorganisms with methane production functions.

[0030] The secondary denitrification unit 14 includes a submerged outlet pipe 141 and an anaerobic drain pipe 142. The total solids concentration of the denitrified sludge in the secondary denitrification unit 14 is 1.4 g / L. The submerged outlet pipe 141 connects to the aerobic nitrification unit 22 in the aerobic housing 21. The submerged outlet pipe 141 is submerged to a depth of 1.2 m, and the effluent flows into the aerobic housing 21 by gravity. The distance between the submerged outlet pipe 141 and the top of the anaerobic housing 11 is 0.3 m. The anaerobic drain pipe 142 is located at the bottom of the anaerobic housing 11 and is connected to the secondary denitrification unit 14 for inspection and maintenance.

[0031] Figure 2 It is a structural schematic diagram of an aerobic treatment device in an embodiment of the present invention.

[0032] like Figure 2 As shown, the aerobic treatment device 20 includes an aerobic housing 21 , an aerobic nitrification unit 22 and an activated sludge separation unit 23 which are interconnected.

[0033] The aerobic housing 21 is connected to the anaerobic housing 11 and includes an aerobic baffle 211 and a first communication port 212. The first communication port 212 is connected to the circulating feed pipe 122. The aerobic baffle 211 has an aerobic nitrification unit 22 on one side and an activated sludge separation unit 23 on the other. The aerobic baffle 211 has a second communication port 213 located above the aerobic baffle 211, which connects the aerobic nitrification unit 22 and the activated sludge separation unit 23.

[0034] The aerobic nitrification unit 22 is connected to the secondary denitrification unit 14. The aerobic nitrification unit 22 is used to place nitrified sludge and volatile solids. It has an inlet pipe 221, an aerobic drain pipe 222, an aerator 223 and a fender 224. The total solid concentration of the nitrified sludge is 1.4 g / L, the ratio of the volatile solid concentration to the total solid concentration of the nitrified sludge is 0.55, and the nitrified sludge age is 25 days. The inlet pipe 221 is located above the aerobic shell 21 and is connected to the submerged outlet pipe 141 of the secondary denitrification unit 14. The aerobic drain pipe 222 is located below the aerobic shell 21 and is used for inspection, maintenance or sludge discharge. The inlet pipe 221 is located on the same horizontal plane as the first connecting port 212 and the second connecting port 213. The aerator 223 is a jet aerator. The height of the mudguard 224 is 10 cm higher than that of the second communication port 213 . The dihedral angle formed between the mudguard 224 and the bottom of the aerobic shell 21 is 70°. The distance between the mudguard 224 and the bottom of the aerobic shell 21 is 35 cm. The length of the mudguard 224 is 3 m.

[0035] The activated sludge separation unit 23 is a horizontal flow sedimentation tank, which is connected to the anaerobic microbial extracellular enzyme hydrolysis unit 12 through the first communication port 212 via the circulation feed pipe 122 , and is connected to the aerobic nitrification unit 22 through the second communication port 213 .

[0036] The decarbonization and denitrification reactor 100 of this embodiment utilizes a linkage control system, i.e., a controller (not shown), between the aerobic and anaerobic treatment units to ensure that the ratio of the treated sewage (wastewater) and the effluent from the sedimentation tank (sewage treated by the activated sludge separation unit 23) is 1:6. Furthermore, the anaerobic microbial extracellular enzyme hydrolysis unit 12 is fed semi-continuously, with the feed time accounting for 1 / 5 of the total operating time. After the feed, the effluent is fed to the activated sludge separation unit at a time interval that is 1 / 1000 of the total operating time.

[0037] In the decarbonization and denitrification reactor 100 of this embodiment for removing microbial metabolites from sewage, after starting operation, the sewage enters the anaerobic microbial extracellular enzyme hydrolysis unit 12 through the sewage feed pipe 121 and then flows upstream to enter the anaerobic decarbonization and denitrification packing layer unit 13. The biogas generated in this process is collected through the biogas conduit 115. Subsequently, the sewage overflows into the secondary denitrification unit 14 and enters the aerobic nitrification unit 22 through the submerged outlet pipe 141. The aeration tank mixed liquid formed by the jet aerator treatment in the aerobic nitrification unit 22 is initially separated by the fender 224, enters the activated sludge separation unit 23, and a portion of the effluent flows back to the anaerobic microbial extracellular enzyme hydrolysis unit 12.

[0038] This embodiment can reduce the chemical oxygen demand (COD) of fresh leachate from 63000 mg / L to 370 mg / L, and the total nitrogen (TN) from 2000 mg / L to 267 mg / L.

[0039] Figure 3 is an analysis diagram based on dissolved organic matter molecular information in an embodiment of the present invention, wherein Figure 3 (A) is the distribution pattern of microbial metabolites in the inlet and outlet water of each unit, Figure 3 (B) is the transformation law of microbial metabolites in aerobic treatment devices and anaerobic treatment devices.

[0040] like Figure 3 As shown, the molecular information is based on the data analysis results of high-resolution mass spectrometry and primary mass spectrometry, which can identify microbial metabolites in sewage. Based on the high-resolution mass spectrometry molecular information analysis of dissolved organic matter, it is proved that the anaerobic microbial extracellular enzyme hydrolysis unit removes 50% of the microbial metabolites.

[0041] <Example 2>

[0042] This embodiment is identical to the first embodiment in other structures. The difference between this embodiment and the first embodiment is that the aerator 223 in the aerobic nitrification unit 22 is a disc aerator, the length of the mud guard 224 is 0 m, and the activated sludge separation unit 23 uses an external ultrafiltration membrane.

[0043] The decarbonization and denitrification reactor of this embodiment utilizes a linkage control system, i.e., a controller (not shown), between the aerobic treatment unit and the anaerobic treatment unit to ensure that the ratio of the treated sewage (wastewater) and the effluent from the sedimentation tank (sewage treated by the activated sludge separation unit 23) is 1:15. Furthermore, the anaerobic microbial extracellular enzyme hydrolysis unit 12 is fed semi-continuously, with the feed time being 1 / 10 of the total operating time. After the feed, the effluent is fed to the activated sludge separation unit at a predetermined interval, where the interval is 1 / 5000 of the total operating time.

[0044] This example can reduce the chemical oxygen demand (COD) of kitchen waste squeezed water from 170,000 mg / L to 470 mg / L, and the total nitrogen (TN) from 2,300 mg / L to 125 mg / L. High-resolution mass spectrometry analysis of dissolved organic matter (DOM) molecular information demonstrates that the anaerobic microbial exoenzyme hydrolysis unit removes 60% of microbial metabolites.

[0045] Example Function and Effect

[0046] According to the decarbonization and denitrification reactor for removing microbial metabolites in sewage of this embodiment, an anaerobic microbial extracellular enzyme hydrolysis unit, an anaerobic decarbonization and denitrification filler layer unit, a secondary denitrification unit, an aerobic nitrification unit, and an activated sludge separation unit are sequentially connected, and the activated sludge separation unit is connected to the anaerobic microbial extracellular enzyme hydrolysis unit. When the nitrified liquid after aerobic treatment is returned to the anaerobic treatment device, microbial metabolites can be removed, thereby enhancing the overall organic matter removal effect of the process. The anaerobic microbial extracellular enzyme hydrolysis unit can remove more than 50% of microbial metabolites. By returning the nitrified liquid after aerobic treatment to the anaerobic treatment device again, decarbonization and denitrification can be achieved, and high-concentration organic matter in the influent can be diluted to alleviate the shock load. Therefore, the anaerobic reactor does not require internal circulation, which can save the energy consumption of the internal circulation pump and save more than 1 / 3 of the energy consumption compared to similar processes. At the same time, the amount of inorganic carbon in the nitrified liquid after aerobic treatment is lower than that in the anaerobic reactor, which is conducive to controlling the scaling problem of the anaerobic reactor and can reduce the scaling rate by 4 times.

[0047] The above embodiments are only used to illustrate specific implementations of the present invention, and the present invention is not limited to the description scope of the above embodiments.

Claims

1. A decarbonization and denitrification reactor for removing microbial metabolites in sewage, used to remove easily degradable organic matter, nitrogen pollutants and newly generated microbial metabolites in the biochemical treatment process in sewage, characterized in that: include: The anaerobic treatment device comprises an anaerobic shell and an anaerobic microbial extracellular enzyme hydrolysis unit, an anaerobic decarbonization and nitrogen removal filler layer unit and a secondary denitrification unit which are sequentially connected; as well as The aerobic treatment device comprises an aerobic shell and an aerobic nitrification unit and an activated sludge separation unit connected thereto. Wherein, the aerobic housing is connected to the anaerobic housing. The anaerobic housing is provided with an anaerobic partition plate, a lower grid plate and an upper grid plate. The anaerobic partition is vertically arranged between one end of the upper grid plate and one end of the lower grid plate. The bottom end of the anaerobic partition is connected to the bottom of the anaerobic shell, and the top end thereof is higher than the upper grid plate. The space formed by the anaerobic baffle, the lower grid plate and the bottom of the anaerobic shell is used to place hydrolyzed sludge and is used as the anaerobic microbial extracellular enzyme hydrolysis unit. The space formed by the anaerobic partition, the lower grid plate and the upper grid plate is used to place fillers, which are used as the anaerobic decarbonization and denitrification filler layer unit. The specific surface area of the filler is 300-700m 2 / m 3 , the layer height is 0.5-3.5m, the filler material is polyethylene or polyvinyl chloride, The space formed by the anaerobic partition and the anaerobic shell is used to place denitrification sludge and is used as the secondary denitrification unit. The aerobic nitrification unit is connected to the secondary denitrification unit. The activated sludge separation unit is connected to the anaerobic microbial extracellular enzyme hydrolysis unit. The anaerobic microbial extracellular enzyme hydrolysis unit adopts semi-continuous water inlet. The water inlet time is 1 / 10-1 / 2 of the total operating time of the reactor.

2. The decarbonization and denitrification reactor for removing microbial metabolites in sewage according to claim 1, characterized in that: in, The upper grid plate and the lower grid plate are connected between the anaerobic shell and the anaerobic partition through a support. The mesh size of the upper mesh plate and the lower mesh plate is 1.0 cm×1.0 cm. The upper grid plate and the lower grid plate are made of glass fiber reinforced plastic, polyvinyl chloride or polyethylene. The support is a right triangle with an acute angle of 30-45°. The thickness of the support is 0.5-5 cm, The material of the support is polyvinyl chloride or polyethylene.

3. The decarbonization and denitrification reactor for removing microbial metabolites in sewage according to claim 1, characterized in that: in, The anaerobic microbial extracellular enzyme hydrolysis unit has a layer height of 0.10-1.5m and a volume of 8-24% of the total volume of the anaerobic shell. The layer height of the anaerobic decarbonization and denitrification filler layer unit is 0.3-2.8 m, and its volume is 70-90% of the total volume of the anaerobic shell.

4. The decarbonization and denitrification reactor for removing microbial metabolites in sewage according to claim 1, characterized in that: in, The anaerobic microbial extracellular enzyme hydrolysis unit also has a sewage feed pipe and a circulation feed pipe. The total solid concentration of the hydrolyzed sludge is 10-30 g / L, The control area of the sewage feed pipe and the circulation feed pipe is 0.3-1.2m 2 , The sewage feed pipe is used to discharge the sewage to be treated, The circulating feed pipe is used to discharge the sewage after being treated by the activated sludge separation unit. The ratio of the sewage to be treated to the sewage treated by the activated sludge separation unit is 1:25-1:

2. The time interval between the discharge of the sewage to be treated after being treated by the activated sludge separation unit is 1 / 20000-1 / 1000 of the total operating time of the reactor.

5. The decarbonization and denitrification reactor for removing microbial metabolites in sewage according to claim 1, characterized in that: in, The filler is attached with a biofilm, the thickness of which is 0.3-2 mm. The outer layer of the biofilm contains microorganisms with denitrification, short-range denitrification and acid-producing functions, and the inner layer contains microorganisms with methane-producing functions.

6. The decarbonization and denitrification reactor for removing microbial metabolites in sewage according to claim 1, characterized in that: in, The secondary denitrification unit includes a submerged outlet pipe and an anaerobic emptying pipe. The total solid concentration of the denitrification sludge is 0.5-6g / L, The submerged outlet pipe has a submerged depth of 0.5-1.2 m and is used to connect to the aerobic nitrification unit. The distance between the submerged outlet pipe and the top of the anaerobic shell is 0.2-0.6 m.

7. The decarbonization and denitrification reactor for removing microbial metabolites in sewage according to claim 4, characterized in that: in, The aerobic housing has an aerobic partition and a first communication port communicating with the circulating feed pipe. One side of the aerobic partition is the aerobic nitrification unit, and the other side is the activated sludge separation unit. The aerobic partition is provided with a second communication port, and the second communication port is used to connect the aerobic nitrification unit and the activated sludge separation unit.

8. The decarbonization and denitrification reactor for removing microbial metabolites in sewage according to claim 7, characterized in that: in, The aerobic nitrification unit comprises nitrification sludge, volatile solids, a water inlet pipe, an aerobic emptying pipe, an aerator and a fender. The total solid concentration of the nitrified sludge is 0.5-3 g / L or 15-25 g / L, and the sludge age is 20-25 days. The ratio of the concentration of the volatile solids to the total solids concentration of the nitrified sludge is 0.3-0.55, The water inlet pipe is located above the aerobic shell and is connected to the submerged outlet pipe of the secondary denitrification unit. The water inlet pipe, the first communication port and the second communication port are located on the same horizontal plane. The aerator is a jet aerator or a disc aerator. The height of the fender is 10-30 cm higher than the second connecting port. The dihedral angle formed by the fender and the bottom surface of the aerobic shell is 70-90°. The distance between the fender and the bottom surface of the aerobic shell is 15-35 cm. The length of the fender is 0-12.6m.

9. The decarbonization and denitrification reactor for removing microbial metabolites in sewage according to claim 1, characterized in that: in, The activated sludge separation unit is a sedimentation tank or an external ultrafiltration membrane. The sedimentation tank is a horizontal flow sedimentation tank or a vertical flow sedimentation tank.

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