A MABR-MBBR-CW coupled sewage treatment process

Abstract

The present invention relates to the technical field of sewage treatment, and discloses a MABR-MBBR-CW coupled sewage treatment process, comprising the following steps: introducing pretreated sewage into a MABR treatment unit for organic matter degradation and denitrification treatment; introducing the effluent of the MABR treatment unit into the aerobic chamber of the MBBR treatment unit, and after the sewage is nitrified by the aeration system, entering the first filler area to remove nitrogen and phosphorus through polyurethane biological fillers, and then strengthening organic matter removal through a gel layer; introducing the effluent of the MBBR treatment unit into a CW treatment unit for deep denitrification and phosphorus removal, and then realizing resource-based nitrogen and phosphorus utilization through aquatic plants. The sewage treatment process of the present invention is simple, can significantly shorten the residence time, increase the system volume load, reduce the floor space, and has stable treatment efficiency, high degree of integration, and a supporting online monitoring and automatic control system, realizing unmanned operation and remote monitoring, and significant economic benefits.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and in particular to a MABR-MBBR-CW coupled sewage treatment process. Background Art

[0002] If the large amount of livestock and poultry manure generated by the livestock and poultry farming industry is discharged directly without treatment, it will easily lead to a decline in the quality of the surrounding water environment and affect the function of the water body. Large-scale livestock and poultry manure has sewage treatment stations, but decentralized livestock and poultry manure lacks effective treatment technology.

[0003] To effectively address the issue of decentralized livestock and poultry manure treatment, most regions currently use the traditional black film method. While this method offers low investment costs and a limited ability to remove organic matter from livestock and poultry manure, it also suffers from long residence times, large footprints, and high effluent COD. It also has limited removal of SS, nitrogen, and phosphorus from livestock and poultry manure, and direct return to farmland can easily lead to soil compaction and reduced crop yields. Furthermore, while high-efficiency anaerobic bioreactors such as upflow sludge blankets (UASBs), anaerobic filters (AFs), and expanded granular sludge blankets (EGSBs) offer high organic matter removal rates, they are complex structures and exhibit low nitrogen and phosphorus removal rates.

[0004] Therefore, how to provide a sewage treatment process with a short hydraulic retention time and the ability to simultaneously reduce SS, organic matter, nitrogen and phosphorus in sewage is an urgent problem that needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention provides a MABR-MBBR-CW coupled sewage treatment process to solve the problem that the hydraulic retention time of existing decentralized livestock and poultry manure treatment methods is long and cannot simultaneously reduce the concentrations of organic matter, SS, nitrogen and phosphorus in sewage.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A MABR-MBBR-CW coupled sewage treatment process comprises the following steps:

[0008] The pretreated sewage is introduced into the MABR treatment unit for organic matter degradation and denitrification treatment;

[0009] The effluent from the MABR treatment unit is introduced into the aerobic chamber of the MBBR treatment unit. The aerobic chamber is provided with an aeration system, a first filler area, and a gel layer from bottom to top. After nitrification treatment in the aeration system, the sewage enters the first filler area and is treated with polyurethane biological fillers to remove nitrogen and phosphorus. The sewage then passes through the gel layer to enhance organic matter removal and intercept the polyurethane biological fillers.

[0010] The effluent from the MBBR treatment unit is introduced into the CW treatment unit for deep denitrification and phosphorus removal, and then the resource utilization of nitrogen and phosphorus is realized through aquatic plants.

[0011] Preferably, along the fluid flow direction, the MABR treatment unit includes an anaerobic zone, an anaerobic zone and an anoxic zone separated by two first baffles and arranged in parallel, and the volume ratio of the facultative zone, the anaerobic zone and the anoxic zone is 1: (2-4.5): (3-4.5).

[0012] Preferably, the anoxic zone is filled with a 3D printed sepiolite modified composite filler, and the specific surface area of ​​the sepiolite modified composite filler is 1385-1620m 2 / m 3 , specific gravity is 0.95-1.05g / cm 3 , the filling rate is 40-60%.

[0013] Preferably, the anaerobic zone and the anoxic zone are both filled with 3D-printed modified zero-valent iron zeolite composite filler, with a filling rate of 30-50%, and the mass percentage of zero-valent iron and zeolite in the modified zero-valent iron zeolite composite filler is 3-5:95-97.

[0014] Preferably, the polyurethane biofiller is a modified activated carbon polyurethane composite filler, and the specific surface area of ​​the modified activated carbon polyurethane composite filler is 950-1050m 2 / m 3 , specific gravity is 0.97-1.03g / cm 3 , the filling rate is 30-55%.

[0015] Preferably, the gel filled in the gel layer comprises the following components in percentage by mass: 5-10% magnetic bentonite, 5-10% chitosan, 0.5-3% sodium alginate, 15-20% polyvinyl alcohol, and 57-74.5% apple pomace cellulose.

[0016] Preferably, the bottom of the aerobic chamber is connected to a sludge return pipe, and the sludge return pipe is provided with a solenoid valve, so that the sludge in the aerobic chamber is returned to the facultative anoxic zone through the sludge return pipe.

[0017] Preferably, a dissolved oxygen meter is provided inside the aerobic chamber to monitor the oxygen content of the water in real time.

[0018] Preferably, a guide layer is further provided in the aerobic cavity, and the guide layer is located at the connection point between the MBBR treatment unit and the CW treatment unit; the guide layer is connected to a nitrification liquid reflux pipe, and a solenoid valve is provided on the nitrification liquid reflux pipe, through which the nitrification liquid in the aerobic cavity is refluxed to the anoxic zone.

[0019] Preferably, the CW treatment unit comprises a second filler area and a floating bed area arranged from bottom to top;

[0020] The second filler area is connected to the aerobic cavity through a mesh plate, and the second filler area is filled with modified ethylene-propylene copolymer filler for deep denitrification and phosphorus removal;

[0021] Aquatic plants are arranged in the floating bed area, and the aquatic plants include one or more of canna, calamus, water plantain, and windmill grass; the side wall of the floating bed area is connected to a water outlet pipe, and the water outlet pipe is installed with an online monitor to measure the concentration of organic matter, SS, ammonia nitrogen, total phosphorus, and total nitrogen in the outlet water.

[0022] Preferably, the facultative anoxic zone, the anaerobic zone and the anoxic zone are all provided with a pneumatic stirring device and an ORP monitor.

[0023] Preferably, the hydraulic retention time of the MABR treatment unit is 1-3 days, the hydraulic retention time of the MBBR treatment unit is 18-36 hours, and the hydraulic retention time of the CW treatment unit is 15-30 hours.

[0024] Preferably, the pretreatment is to perform solid-liquid separation treatment on the sewage through a grid and a solid-liquid separator.

[0025] The present invention provides a MABR-MBBR-CW coupled sewage treatment process, which has the following advantages compared with the prior art:

[0026] The MABR-MBBR-CW coupled sewage treatment process of the present invention is simple, integrating the functional zoning of MABR, MBBR and CW. The MABR treatment unit converts organic matter in manure into biogas, denitrifies and removes nitrogen. The biogas liquid is subjected to enhanced nitrification in the MBBR treatment unit, and then is subjected to the CW treatment unit to achieve deep treatment and utilization of nitrogen and phosphorus.

[0027] The gel layer provided on the upper portion of the first filler zone in the MBBR treatment unit of the present invention not only enhances organic matter removal but also intercepts the MBBR filler, preventing filler loss, shortening the hydraulic retention time, increasing the volumetric load, and reducing investment and operation costs. The CW treatment unit not only performs deep denitrification and phosphorus removal but also realizes resourceful nitrogen and phosphorus utilization through aquatic plants, thereby providing landscape benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0029] Figure 1 It is a structural schematic diagram of the MABR-MBBR-CW coupled sewage treatment system of the present invention.

[0030] In the figure:

[0031] 100-pretreatment module, 101-water inlet pipe, 102-grid, 103-solid-liquid separator, 1031 screen, 1032-auger, 1033-screw shaft, 300-MABR treatment unit, 301-water inlet, 302-first baffle, 303-anaerobic zone, 304-anaerobic zone, 305-anoxic zone, 306-modified sepiolite composite filler, 307-modified zero-valent iron zeolite composite filler, 400-MBBR treatment unit, 401-transition chamber, 402-aerobic chamber, 403-second baffle, 404-filter plate, 405-mud guide plate, 406-microporous aeration tube , 407-first filling area, 408-gel layer, 409-sludge return pipe, 410-sludge return solenoid valve, 411-guide layer, 412-nitrification liquid return pipe, 413-nitrification liquid return solenoid valve, 500-CW treatment unit, 501-second filling area, 511-modified ethylene propylene copolymer filler, 502-floating bed area, 521-planting basket, 522-aquatic plants, 503-outlet trough, 504-screen plate, 600-outlet pipe, 800-automatic control system, 801-first control system, 802-second control system, 803-third control system, 804-fourth control system. DETAILED DESCRIPTION

[0032] The present invention will be described below by specific embodiment, and it will be appreciated by those skilled in the art that the specific embodiment below is only for illustrative purposes, and does not limit the scope of the present invention in any way. In addition, in the following examples, unless otherwise stated, the reagent and equipment used are all commercially available. If in the following examples, concrete treatment conditions and treatment process are not clearly described, then conditions and methods well known in the art can be adopted to process.

[0033] The embodiment of the present invention provides a MABR-MBBR-CW coupled sewage treatment process, comprising the following steps:

[0034] S1, introducing the pretreated sewage into the MABR treatment unit 300 for organic matter degradation and denitrification treatment;

[0035] S2. The effluent from the MABR treatment unit 300 is introduced into the aerobic chamber 402 of the MBBR treatment unit 400. The aerobic chamber 402 is provided with an aeration system, a first filler area 407, and a gel layer 408 from bottom to top. After nitrification treatment by the aeration system, the sewage enters the first filler area 407 and is treated by polyurethane biofillers to remove nitrogen and phosphorus. The sewage then passes through the gel layer 408 to enhance organic matter removal and intercept the polyurethane biofillers.

[0036] S3. The effluent from the MBBR treatment unit 400 is introduced into the CW treatment unit 500 for deep denitrification and phosphorus removal, and then the nitrogen and phosphorus are utilized as resources through the aquatic plants 522.

[0037] Optionally, along the fluid flow direction, the MABR treatment unit 300 includes an anaerobic zone 303, an anaerobic zone 304 and an anoxic zone 305 separated by two first baffles 302 and arranged in parallel, and the volume ratio of the facultative zone 303, the anaerobic zone 304 and the anoxic zone 305 is 1: (2-4.5): (3-4.5), for example, it can be 1:2:3, 1:4.5:4.5, 1:3:4, etc., and a water inlet 301 is provided at the bottom of the facultative zone 303; preferably, a filter is provided at the connecting port of each reaction zone, and more preferably, the pore size of the filter gradually becomes smaller along the fluid flow direction, which can gradually intercept suspended matter in the sewage and realize solid-liquid separation.

[0038] Preferably, the anoxic zone is filled with 3D printed sepiolite modified composite filler.

[0039] Optionally, the facultative sludge is inoculated in the facultative sludge zone 303 and filled with 3D printed sepiolite modified composite filler 306, with a filling rate of 40-60%, for example, 40%, 50%, 60%, etc.; the specific surface area of ​​the sepiolite modified composite filler is 1385-1620m 2 / m 3 , specific gravity is 0.95-1.05g / cm 3 .

[0040] The anaerobic zone 304 and the anoxic zone 305 are inoculated with anaerobic sludge and denitrification sludge, respectively, and are both filled with 3D-printed modified zero-valent iron zeolite composite filler 307, with a filling rate of 30-50%, for example, 30%, 40%, 50%, etc. The mass percentage of zero-valent iron and zeolite in the modified zero-valent iron zeolite composite filler is 3-5:95-97.

[0041] It can be understood that the MABR treatment unit 300 uses 3D printed sepiolite modified composite filler 306 and modified zero-valent iron zeolite composite filler 307, and adopts 3D melt printing porous core-shell structure to enhance the removal efficiency of organic matter and ammonia nitrogen in the system, enhance the stability and antioxidant properties of the filler, and reduce the cost of the filler.

[0042] Optionally, pneumatic stirring devices and ORP monitors are installed in the facultative anaerobic zone 303, anaerobic zone 304, and anoxic zone 305. Stirring can enhance the contact between anaerobic microorganisms and pollutants, improving the system's treatment efficiency. Monitoring ORP values ​​can be used to assess the effectiveness of wastewater treatment and ensure that harmful substances in the wastewater are effectively removed.

[0043] In some embodiments of the present invention, the MBBR treatment unit 400 includes a transition chamber 401 and an aerobic chamber 402 arranged in parallel and connected to each other. The lower part of the transition chamber 401 is connected to the top of the anoxic zone 305 of the MABR treatment unit 300. Preferably, a filter plate 404 is provided at the connection point to further intercept suspended solids in the sewage.

[0044] Optionally, the transition chamber 401 and the aerobic chamber 402 are separated by a second baffle 403. The aerobic chamber 402 is located on one side of the transition chamber 401. The transition chamber 401 introduces the liquid to be treated into the aerobic chamber 402 through the second baffle 403. The aerobic chamber 402 is inoculated with aerobic sludge such as nitrified sludge. A mud guide plate 405 is provided at the bottom of the aerobic chamber 402. An aeration system is provided on the inner side of the mud guide plate 405 near the top end. The aeration system includes a microporous aeration tube 406 and a blower aerator connected to the microporous aeration tube 406. The aeration system dissolves oxygen in the water in the form of bubbles, providing oxygen for aerobic microorganisms and improving the treatment efficiency of the MBBR system.

[0045] Optionally, the polyurethane biofiller is a modified activated carbon polyurethane composite filler, and the specific surface area of ​​the modified activated carbon polyurethane composite filler is 950-1050m 2 / m 3 , specific gravity is 0.97-1.03g / cm 3 , the filling rate is 30-55%; for example, the specific surface area is 980m 2 / m 3 , specific gravity is 1.01g / cm 3 , the filling rate is 40%. Polyurethane biological fillers can effectively remove nitrogen and phosphorus in water.

[0046] Optionally, the gel filled in the gel layer 408 includes the following components in percentage by mass: 5-10% magnetic bentonite, 5-10% chitosan, 0.5-3% sodium alginate, 15-20% polyvinyl alcohol, and 57%-74.5% apple pomace cellulose.

[0047] The gel layer 408 provided on the upper portion of the first filler area 407 can not only enhance the removal of organic matter but also intercept the filler in the first filler area 407, thereby preventing the loss of filler, shortening the hydraulic retention time, increasing the volume load, and reducing the investment and operation and maintenance costs.

[0048] Optionally, the bottom of the aerobic chamber 402 is connected to a sludge return pipe 409, and a sludge return solenoid valve 410 is provided on the sludge return pipe 409, through which the sludge in the aerobic chamber 402 is returned to the facultative aerobic zone 303; a dissolved oxygen meter is provided inside the aerobic chamber 402 to monitor the oxygen content of the water in real time.

[0049] Optionally, a guide layer 411 is further provided in the aerobic cavity 402. The guide layer 411 is located at the connection point between the MBBR treatment unit 400 and the CW treatment unit 500, specifically at the top of the gel layer 408. The guide layer 411 is connected to a nitrification liquid reflux pipe 412. A nitrification liquid reflux solenoid valve 413 is provided on the nitrification liquid reflux pipe 412. The nitrification liquid in the aerobic cavity 402 is refluxed to the anoxic zone 305 through the nitrification liquid reflux pipe 412.

[0050] It can be understood that the dissolved oxygen meter can monitor the oxygen content of the water in the cavity in real time and adjust the oxygen content according to the monitoring data. In addition, the sludge and intermediate products can be recycled repeatedly through the sludge return and nitrification liquid return to reduce costs.

[0051] In some embodiments of the present invention, the CW treatment unit 500 is located at the top of the aerobic chamber 402 and is connected to the aerobic chamber 402. The CW treatment unit 500 includes a second filler area 501 and a floating bed area 502 arranged from bottom to top, which are used to deeply treat nitrogen and phosphorus in wastewater and realize resource utilization of nitrogen and phosphorus.

[0052] Optionally, the second filler area 501 is connected to the aerobic cavity 402 through a mesh plate 504 , and the second filler area 501 is filled with a modified ethylene-propylene copolymer filler 511 for deep denitrification and dephosphorization.

[0053] Optionally, a planting basket 521 and aquatic plants 522 are provided in the floating bed area 502, and the aquatic plants 522 include one or more of canna, calamus, water plantain, and windmill grass; the side wall of the floating bed area 502 is connected to a water outlet pipe 600, and the water outlet pipe 600 is installed with an online monitor to measure the concentrations of organic matter, SS, ammonia nitrogen, total phosphorus, and total nitrogen in the outlet water.

[0054] Optionally, the floating bed area 502 is provided with a water outlet trough 503, the side wall of the water outlet trough 503 is connected to a water outlet pipe 600, and the water outlet pipe 600 is installed with online monitors for COD, ammonia nitrogen, total phosphorus, total nitrogen, etc. When the monitoring data meets the water quality requirements, it can be discharged.

[0055] In some embodiments of the present invention, pretreatment is to perform solid-liquid separation on the sewage through a pretreatment module, and the pretreatment module includes an inlet pipe 101, a grid 102, and a solid-liquid separator 103 connected in sequence, wherein the grid 102 is used to remove larger solid impurities in the sewage, and the solid-liquid separator 103 is used to remove crude fiber organic matter in the feces as a raw material for organic fertilizer processing, reduce the blockage rate of subsequent reactors, and improve the stability of system operation. Preferably, the solid-liquid separator 103 is composed of a screen 1031, an auger 1032, and a screw shaft 1033, and the screen 1031, the auger 1032, and the screw shaft 1033 are all made of stainless steel.

[0056] In some embodiments of the present invention, an automatic control system 800 is further employed to control the treatment process. The automatic control system 800 includes a first control system 801, a second control system 802, a third control system 803, and a fourth control system 804. The first control system 801 is connected to the nitrification liquid return solenoid valve 413, the second control system 802 is connected to the aeration system, the third control system 803 is connected to the pneumatic stirring device, and the fourth control systems 804, 804 are connected to the sludge return solenoid valve 410. By providing an online monitoring and automatic control system, operation is simple and operation is stable.

[0057] In some embodiments of the present invention, the hydraulic retention time of the MABR treatment unit 300 is 1-3 days, for example, 1 day, 2 days, 3 days, etc.; the hydraulic retention time of the MBBR treatment unit 400 is 18-36 hours, for example, 18 hours, 27 hours, 36 hours, etc.; and the hydraulic retention time of the CW treatment unit 500 is 15-30 hours, for example, 15 hours, 20 hours, 30 hours, etc. The short hydraulic retention time of the present invention effectively increases volumetric load and reduces investment and operation and maintenance costs.

[0058] Below, the effects that can be achieved by the MABR-MBBR-CW coupled sewage treatment process of the present invention are described through specific embodiments.

[0059] Example 1

[0060] This embodiment discloses a MABR-MBBR-CW coupled sewage treatment process, comprising the following steps:

[0061] S1, the livestock and poultry manure is cleaned by a manure scraper, and then pre-treated by a grille to remove floating impurities for preliminary solid-liquid separation, and then enters the solid-liquid separator for dry-wet separation;

[0062] S2. The wastewater after solid-liquid separation is introduced into the MABR treatment unit for organic matter degradation and denitrification treatment. The facultative anoxic zone is filled with 3D-printed sepiolite modified composite filler, and the anaerobic and anoxic zones are filled with modified 3D-printed zero-valent iron zeolite composite filler. The hydraulic retention time in the MABR treatment unit is controlled to 1 day.

[0063] S3. The effluent from the anoxic zone is introduced into the aerobic chamber of the MBBR treatment unit. After nitrification treatment in the aeration system, the sewage enters the first packing zone and is treated with modified activated carbon polyurethane composite packing to remove nitrogen and phosphorus. Then, the gel layer is used to enhance the removal of organic matter and nitrogen and phosphorus. The hydraulic retention time in the MBBR treatment unit is controlled to 18 hours.

[0064] S4. The effluent from the aerobic chamber is introduced into the CW treatment unit, where it undergoes deep nitrogen and phosphorus removal through modified EPDM filler, and then nitrogen and phosphorus are recycled through aquatic plants in the floating bed area. The hydraulic retention time in the MBBR is 15 hours.

[0065] Comparative Example 1

[0066] The difference from Example 1 is that the sewage after solid-liquid separation is introduced into the MABR treatment unit, the facultative aerobic zone is not filled with 3D-printed sepiolite-modified composite filler, but an equal amount of Pall rings are used, the hydraulic retention time in the MABR treatment unit is controlled at 1.5d, and other operating conditions remain unchanged.

[0067] Compared with Comparative Example 1, the effluent COD, BOD5, total phosphorus, and ammonia nitrogen in Example 1 were 150 mg / L, 80 mg / L, 7.5 mg / L, and 70 mg / L, respectively. The removal rates of COD, BOD5, total phosphorus, and ammonia nitrogen increased by 4.8%, 4.3%, 5.6%, and 10.7%, respectively, as shown in Table 1.

[0068] Example 2

[0069] S1, the livestock and poultry manure is cleaned by a manure scraper, and then pre-treated by a grille to remove floating impurities for preliminary solid-liquid separation, and then enters the solid-liquid separator for dry-wet separation;

[0070] S2. The wastewater after solid-liquid separation is introduced into the MABR treatment unit for organic matter degradation and denitrification treatment. The facultative anoxic zone is filled with 3D-printed sepiolite modified composite filler, and the anaerobic and anoxic zones are filled with modified 3D-printed zero-valent iron zeolite composite filler. The hydraulic retention time in the MABR treatment unit is controlled to 3 days.

[0071] S3. The effluent from the anoxic zone is introduced into the aerobic chamber of the MBBR treatment unit. After nitrification treatment in the aeration system, the sewage enters the first packing zone and is treated with modified activated carbon polyurethane composite packing to remove nitrogen and phosphorus. Then, the gel layer is used to enhance the removal of organic matter and nitrogen and phosphorus. The hydraulic retention time in the MBBR treatment unit is controlled to 36 hours.

[0072] S4. The effluent from the aerobic chamber is introduced into the CW treatment unit, where it undergoes deep nitrogen and phosphorus removal through modified ethylene-propylene copolymer filler, and then the nitrogen and phosphorus are recycled through the aquatic plants in the floating bed area. The hydraulic retention time in the MBBR is 30 hours.

[0073] Comparative Example 2

[0074] The difference from Example 2 is that the sewage after solid-liquid separation is introduced into the MABR treatment unit, the facultative anoxic zone is not filled with 3D-printed sepiolite modified composite filler, but an equal amount of ball rings is used, and the modified activated carbon polyurethane composite filler is not added to the first filler area of ​​the MBBR treatment unit. Instead, the same amount of ball rings are used, the hydraulic retention time in the MABR treatment unit is controlled at 3.2d, and the hydraulic retention time in the MBBR treatment unit is controlled at 40h, and other control conditions remain unchanged.

[0075] Compared with Comparative 2, the effluent COD, BOD5, total phosphorus, and ammonia nitrogen in Example 2 were 132 mg / L, 65 mg / L, 6.1 mg / L, and 55 mg / L, respectively. The removal rates of COD, BOD5, total phosphorus, and ammonia nitrogen increased by 3.3%, 3.9%, 17.9%, and 15.4%, respectively, as shown in Table 1.

[0076] Table 1

[0077] Example 1 Comparative Example 1 Example 2 Comparative Example 2 <![CDATA[COD 进水 (mg / L)]]> 3500 3500 3325 3325 <![CDATA[COD 出水 (mg / L)]]> 150 320 132 243 <![CDATA[BOD 5进水 (mg / L)]]> 3000 3000 2829 2829 <![CDATA[BOD 5出水 (mg / L)]]> 80 210 65 174 <![CDATA[Total Phosphorus 进水 (mg / L)]]> 50 50 47 47 <![CDATA[Total Phosphorus 出水 (mg / L)]]> 7.5 10.3 6.1 14.5 <![CDATA[Ammonia nitrogen 进水 (mg / L)]]> 450 450 389 389 <![CDATA[Ammonia nitrogen 出水 (mg / L)]]> 70 118 55 115

[0078] As can be seen from Table 1, the treatment effect of the present invention is significantly higher than that of the comparative case process, and complies with the "Pollutant Emission Standard for Animal Husbandry and Poultry Breeding" (GB18596-2001).

[0079] In the description of this specification, the descriptions with reference to the terms "one embodiment", "another embodiment", "yet another embodiment", "some embodiments", "some specific embodiments", "some other specific embodiments", etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment are included in at least one embodiment of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are mutually inconsistent. In addition, it should be noted that in this specification, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated.

[0080] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A MABR-MBBR-CW coupled sewage treatment process, characterized in that: The following steps are involved: The pretreated sewage is introduced into the MABR treatment unit for organic matter degradation and denitrification treatment; The effluent from the MABR treatment unit is introduced into the aerobic chamber of the MBBR treatment unit. The aerobic chamber is provided with an aeration system, a first filler area, and a gel layer from bottom to top. After nitrification treatment in the aeration system, the sewage enters the first filler area and is treated with polyurethane biological fillers to remove nitrogen and phosphorus. The sewage then passes through the gel layer to enhance organic matter removal and intercept the polyurethane biological fillers. The effluent from the MBBR treatment unit is introduced into the CW treatment unit for deep nitrogen and phosphorus removal, and then the nitrogen and phosphorus are utilized as resources through aquatic plants; Along the fluid flow direction, the MABR treatment unit includes an anaerobic zone, an anaerobic zone, and an anoxic zone separated by two first baffles and arranged in parallel, and the volume ratio of the anaerobic zone, the anaerobic zone, and the anoxic zone is 1: (2-4.5): (3-4.5); The anoxic zone is filled with 3D printed sepiolite modified composite filler, and the specific surface area of ​​the sepiolite modified composite filler is 1385-1620m 2 / m 3 , with a specific gravity of 0.95-1.05 g / cm 3 , the filling rate is 40-60%; The anaerobic zone and the anoxic zone are both filled with 3D-printed modified zero-valent iron zeolite composite filler, with a filling rate of 30-50%. The mass percentage of zero-valent iron and zeolite in the modified zero-valent iron zeolite composite filler is 3-5:95-97.

2. The MABR-MBBR-CW coupled sewage treatment process according to claim 1, characterized in that: The polyurethane biological filler is a modified activated carbon polyurethane composite filler, and the specific surface area of ​​the modified activated carbon polyurethane composite filler is 950-1050m 2 / m 3 , specific gravity is 0.97-1.03g / cm 3 , the filling rate is 30-55%.

3. The MABR-MBBR-CW coupled sewage treatment process according to claim 1, characterized in that: The gel filled in the gel layer includes the following components in percentage by mass: 5-10% magnetic bentonite, 5-10% chitosan, 0.5-3% sodium alginate, 15-20% polyvinyl alcohol, and 57-74.5% apple pomace cellulose.

4. The MABR-MBBR-CW coupled sewage treatment process according to claim 1, characterized in that: The bottom of the aerobic chamber is connected to a sludge return pipe, and the sludge return pipe is provided with a solenoid valve, and the sludge in the aerobic chamber is returned to the facultative anoxic zone through the sludge return pipe; A dissolved oxygen meter is provided inside the aerobic cavity to monitor the oxygen content of the water in real time.

5. The MABR-MBBR-CW coupled sewage treatment process according to claim 1, characterized in that: A guide layer is further provided on the top of the aerobic chamber, and the guide layer is located at the connection point between the MBBR treatment unit and the CW treatment unit; The guide layer is connected to a nitrification liquid reflux pipe, and a solenoid valve is provided on the nitrification liquid reflux pipe. The nitrification liquid in the aerobic cavity is refluxed to the anoxic zone through the nitrification liquid reflux pipe.

6. The MABR-MBBR-CW coupled sewage treatment process according to claim 1, characterized in that: The CW treatment unit includes a second filler area and a floating bed area arranged from bottom to top; The lower portion of the second filler area is connected to the aerobic cavity via a mesh plate, and the second filler area is filled with modified ethylene-propylene copolymer filler for deep denitrification and phosphorus removal; Aquatic plants are arranged in the floating bed area, and the aquatic plants include one or more of canna, calamus, water plantain, and windmill grass; the side wall of the floating bed area is connected to a water outlet pipe, and the water outlet pipe is installed with an online monitor to measure the concentration of organic matter, SS, ammonia nitrogen, total phosphorus, and total nitrogen in the outlet water.

7. The MABR-MBBR-CW coupled sewage treatment process according to claim 1, characterized in that: The facultative anoxic zone, the anaerobic zone and the anoxic zone are all provided with a pneumatic stirring device and an ORP monitor.

8. The MABR-MBBR-CW coupled sewage treatment process according to any one of claims 1 to 7, characterized in that: The hydraulic retention time of the MABR treatment unit is 1-3 days, the hydraulic retention time of the MBBR treatment unit is 18-36 hours, and the hydraulic retention time of the CW treatment unit is 15-30 hours.

9. The MABR-MBBR-CW coupled sewage treatment process according to any one of claims 1 to 7, characterized in that: The pretreatment is to perform solid-liquid separation on the sewage through a grid and a solid-liquid separator.

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