A pulp wastewater treatment device coupled with a MABR process

Abstract

The utility model relates to a kind of paper pulp waste water treatment device of coupling MABR technology, relate to water treatment technical field.Processing device is by inlet pipe, hydrolytic acidification pond, anoxic pond, microaerophilic pond, aerobic pond, sedimentation tank, filter tank, water outlet and gas supply system composition, inlet pipe is located in hydrolytic acidification pond front end, water outlet is set in filter tank end side bottom, gas supply system is separately set, respectively to anoxic pond, microaerophilic pond and aerobic pond gas supply.Utilize hydrolytic acidification pond to improve the biodegradability of sewage, anoxic pond and microaerophilic pond realize simultaneous nitrification and denitrification denitrification;Aerobic pond further removes organic matter and ammonia nitrogen;Filter tank is used to remove suspended solids and residual pollutants, and the water quality after comprehensive treatment can meet the scope of municipal sewage treatment reception.The utility model has the advantages of simultaneous nitrification and denitrification in MABR anoxic pond, high pollutant removal rate, zero or less adding external carbon source, simple operation, low operating cost, easy maintenance and the like.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment technology and relates to a pulp wastewater treatment device coupled with MABR process. Background Technology

[0002] Although paperless office practices are becoming increasingly sophisticated, paper is still needed in many places, and pulp and paper production cannot be stopped. The wastewater generated during the pulping process has a high concentration of pollutants but low biodegradability. The traditional "primary coagulation + aerobic" process can no longer meet the treatment requirements. At the same time, a large amount of external carbon source needs to be added to remove nitrogen, resulting in high wastewater treatment costs and a large amount of sludge.

[0003] In recent years, MABR technology has been tested for high-load wastewater due to its advantages such as "bubble-free aeration, oxygen utilization rate >60%, and special biofilm structure." However, the high temperature, high toxicity, and high suspended solids (SS) environment of pulp wastewater can easily pose a toxic hazard to the biofilm structure, and MABR alone has limited removal efficiency for some recalcitrant pollutants. Therefore, there is an urgent need for a high-efficiency, low-energy-consumption wastewater treatment process that integrates hydrolysis acidification, MABR anoxic denitrification, MABR micro-aerobic nitrification and denitrification, MBBR aerobic carbon removal and nitrification, and filtration systems to achieve efficient denitrification and carbon removal for low C / N ratio pulp wastewater. Utility Model Content

[0004] The purpose of this invention is to provide a wastewater denitrification and carbon removal treatment device based on hydrolysis acidification and MABR coupling, which solves the problems of low denitrification efficiency, high energy consumption and insufficient carbon source in existing technologies for wastewater with low carbon-to-nitrogen ratio.

[0005] The specific technical solution is as follows: A pulp wastewater treatment device coupled with MABR process is characterized by comprising an inlet pipe, a hydrolysis acidification tank, an anoxic tank, a micro-aerobic tank, an aerobic tank, a sedimentation tank, a filter tank, an outlet, and an air supply system. The inlet pipe is located at the front end of the hydrolysis acidification tank. The anoxic tank, micro-aerobic tank, aerobic tank, sedimentation tank, and filter tank are connected in sequence. The outlet is located at the bottom of the side at the end of the filter tank. The air supply system is set up separately to supply air to the anoxic tank, micro-aerobic tank, and aerobic tank respectively. A flow-pushing agitator is installed inside the hydrolysis acidification tank; The anoxic tank is equipped with an MABR packing treatment unit, which consists of an MABR membrane module, packing, air supply connection pipe, membrane frame, bottom control valve, bottom air supply pipe and bottom aerator. The micro aerobic tank is equipped with an MABR treatment unit, which consists of an MABR membrane module, an air supply connection pipe, a membrane frame, an exhaust gas collection pipe, a perforated aeration pipe, and aeration holes. The aerobic tank is equipped with an MBBR packing treatment unit, which consists of MBBR packing, an interception net, a bottom control valve, a bottom air supply pipe, and a bottom aerator. The sedimentation tank is equipped with inclined plates and sludge discharge pipes at the bottom. One pipe is a sludge return pipe, which returns the sludge to the front end of the hydrolysis acidification tank, and the other pipe is a residual sludge discharge pipe, which discharges the residual sludge out of the system. The filtration tank adopts a double-layer filter media downflow filtration tank; The gas supply system mainly consists of gas supply equipment, gas supply pipes, and gas supply control valves. Each unit, including the anoxic pool, the micro-aerobic pool, and the aerobic pool, is equipped with a gas supply control valve.

[0006] Furthermore, the number of MABR filler processing units is two or more, and the ratio of the number of MABR membrane modules to fillers is 1:1 to 1:5.

[0007] Furthermore, the dissolved oxygen concentration in the micro-aerobic tank is controlled at 0.5-1.5 mg / L, the number of MABR treatment units is one or more, and the tail gas of the MABR membrane module is collected through the tail gas collection pipe and sent to the perforated aeration pipe at the bottom, and discharged into the water body from the aeration hole.

[0008] Furthermore, the MBBR packing in the MBBR packing treatment unit is made of high-density polyethylene, and the MBBR packing ratio is controlled at 1 / 2.

[0009] Furthermore, the aerobic tank is equipped with a nitrification liquor recirculation system, in which the nitrification liquor is recirculated back to the front end of the anoxic tank through a nitrification liquor recirculation pipe, and the nitrification liquor recirculation ratio is controlled at 0-200%.

[0010] Furthermore, the sludge return ratio of the sedimentation tank is controlled between 0 and 100%.

[0011] Furthermore, the upper filter media of the filter tank is selected as activated carbon filter media, and the lower filter media is selected as quartz sand filter media. The thickness of the upper filter media is 600-1000mm, and the thickness of the lower filter media is 600-800mm.

[0012] Furthermore, the hydraulic retention time in the anoxic tank is 6-12 hours, the hydraulic retention time in the micro-aerobic tank is 6-10 hours, and the hydraulic retention time in the aerobic tank is 10-16 hours.

[0013] This invention relates to a pulp wastewater treatment device coupled with a MABR process. It utilizes a hydrolysis acidification tank to decompose large organic molecules in wastewater into smaller organic acids, improving the wastewater's biodegradability. In the anoxic tank, the MABR and packing material are combined for efficient nitrogen removal. The micro-aerobic tank utilizes the unique microbial membrane structure of MABR technology to achieve simultaneous nitrification and denitrification. The aerobic tank further removes organic matter and unconverted ammonia nitrogen through nitrification. The advanced treatment system's filtration tank removes suspended solids and some residual pollutants. Combined with these treatment units, the effluent quality meets the requirements for municipal wastewater treatment. This invention offers advantages such as simultaneous nitrification and denitrification in the MABR anoxic tank, high pollutant removal rate, zero or minimal addition of external carbon sources, simple operation, low operating costs, and easy maintenance. Attached Figure Description

[0014] Appendix Figure 1 This is a schematic diagram of the elevation structure of this utility model.

[0015] Appendix Figure 2 This is a schematic diagram of the MABR packing treatment unit structure of this utility model.

[0016] Appendix Figure 3 This is a schematic diagram of the MABR processing unit structure of this utility model.

[0017] Appendix Figure 4 This is a schematic diagram of the MBBR packing treatment unit structure of this utility model.

[0018] In the diagram: 1. Inlet pipe; 2. Hydrolysis acidification tank; 201. Flow mixer; 3. Anoxic tank; 301. MABR membrane module; 302. Packing material; 303. Air supply connection pipe; 304. Membrane frame; 305. Bottom control valve; 306. Bottom air supply pipe; 307. Bottom aerator; 4. Micro-aerobic tank; 401. Tail gas collection pipe; 402. Perforated aeration pipe; 403. Aeration hole; 5. Aerobic tank; 501. MBBR packing material; 502. Interception net; 503. Nitrified liquid return pipe; 6. Sedimentation tank; 601. Sludge return pipe; 602. Excess sludge discharge pipe; 7. Filter tank; 8. Outlet; 9. Air supply system; 901. Air supply pipe; 902. Air supply control valve. Detailed Implementation

[0019] Combination Figures 1 to 4 The present invention provides a further description of a pulp wastewater treatment device coupled with a MABR process: A pulp wastewater treatment device coupled with MABR process comprises an inlet pipe 1, a hydrolysis acidification tank 2, an anoxic tank 3, a micro-aerobic tank 4, an aerobic tank 5, a sedimentation tank 6, a filter tank 7, an outlet 8, and an air supply system 9. The inlet pipe 1 is located at the front end of the hydrolysis acidification tank 2. The anoxic tank 3, micro-aerobic tank 4, aerobic tank 5, sedimentation tank 6, and filter tank 7 are connected sequentially. The outlet 8 is located at the bottom of the side of the end of the filter tank 7. The air supply system 9 is separately configured to supply air to the anoxic tank 3, micro-aerobic tank 4, and aerobic tank 5. A flow mixer 201 is installed in the hydrolysis acidification tank 2. The anoxic tank 3 contains a MABR packing treatment unit, which consists of a MABR membrane module 301, packing material 302, an air supply connection pipe 303, a membrane frame 304, a bottom control valve 305, a bottom air supply pipe 306, and a bottom aerator 307. The micro-aerobic tank 4 contains a MABR treatment... The MABR treatment unit consists of a MABR membrane module 301, an air supply connection pipe 303, a membrane frame 304, a tail gas collection pipe 401, a perforated aeration pipe 402, and aeration holes 403. The aerobic tank 5 is equipped with an MBBR packing treatment unit, which consists of MBBR packing 501, an interceptor mesh 502, a bottom control valve 305, a bottom air supply pipe 306, and a bottom aerator 307. The sedimentation tank 6 is equipped with inclined plates and a sludge discharge pipe at the bottom. One pipe is a sludge return pipe 601, returning the sludge to the front end of the hydrolysis acidification tank, and the other is a residual sludge discharge pipe 602, discharging the residual sludge outside the system. The filter tank 7 uses a double-layer downflow filter. The air supply system 9 mainly consists of air supply equipment, an air supply pipe 901, and an air supply control valve 902, supplying air to the anoxic tank 3, the micro-aerobic tank 4, and the aerobic tank 5. Each unit is equipped with an air supply control valve 902.

[0020] Example 1: Water treatment capacity of 500m³ 3 / d, the processing device is set according to the above implementation method, and the specific implementation method also includes the following: The hydraulic retention time (HRT) of anoxic tank 3 is 6-12 hours, such as 6, 10, or 12 hours; the HRT of microaerobic tank 4 is 6-10 hours, such as 6, 8, or 10 hours; and the HRT of aerobic tank 5 is 10-16 hours, such as 10, 12, or 16 hours. These times are adjusted according to the required water quality. In the initial stage of operation, the maximum HRT value is generally selected for each treatment unit, i.e., 12 hours for anoxic tank 3, 10 hours for microaerobic tank 4, and 16 hours for aerobic tank 5.

[0021] The anoxic tank 3 is equipped with 4 sets of MABR packing treatment units, with a MABR membrane module to packing ratio of 1:2; the micro-aerobic tank 4 is equipped with 6 sets of MABR treatment units, controlling the dissolved oxygen concentration at 0.5-1.5 mg / L. The exhaust gas from the MABR membrane module 301 is collected through the exhaust gas collection pipe 401 and sent to the perforated aeration pipe 402 at the bottom, and then discharged into the water body 403 through the aeration hole; the aerobic tank 5 is equipped with an MBBR packing treatment unit, using high-density polyethylene packing, with the MBBR packing 501 filling ratio controlled at 1 / 2.

[0022] The aerobic tank 5 is equipped with a nitrification liquor return system. The nitrified liquor is returned to the front end of the anoxic tank 3 through the nitrification liquor return pipe 503. The nitrification liquor return ratio is controlled between 0-200%. In the early stage of operation, a larger value is selected for the nitrification liquor return ratio, and it is adjusted according to the operation situation in the later stage. Finally, zero nitrification liquor return can be achieved. The sludge return ratio of the sedimentation tank 6 is controlled between 0-100%.

[0023] The upper layer of filter media in filter tank 7 is made of activated carbon, and the lower layer is made of quartz sand. The thickness of the upper layer is 800mm, and the thickness of the lower layer is 800mm.

[0024] The water quality after treatment by the above-mentioned treatment device can meet the design requirements for effluent water quality, and the main effluent water quality indicators can meet the Class A standard of "Water Quality Standard for Wastewater Discharge into Urban Sewerage Systems" (GB / T 31962-2015).

[0025] The above embodiments are merely illustrative of the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made based on the substance of the content of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A pulp wastewater treatment device coupled with MABR process, characterized in that: It consists of an inlet pipe, a hydrolysis acidification tank, an anoxic tank, a micro-aerobic tank, an aerobic tank, a sedimentation tank, a filtration tank, an outlet, and an air supply system. The inlet pipe is located at the front end of the hydrolysis acidification tank. The anoxic tank, micro-aerobic tank, aerobic tank, sedimentation tank, and filtration tank are connected in sequence. The outlet is located at the bottom side of the end of the filtration tank. The air supply system is set up separately to supply air to the anoxic tank, micro-aerobic tank, and aerobic tank respectively. A flow-pushing agitator is installed inside the hydrolysis acidification tank; The anoxic tank is equipped with an MABR packing treatment unit, which consists of an MABR membrane module, packing, air supply connection pipe, membrane frame, bottom control valve, bottom air supply pipe and bottom aerator. The micro aerobic tank is equipped with an MABR treatment unit, which consists of an MABR membrane module, an air supply connection pipe, a membrane frame, an exhaust gas collection pipe, a perforated aeration pipe, and aeration holes. The aerobic tank is equipped with an MBBR packing treatment unit, which consists of MBBR packing, an interception net, a bottom control valve, a bottom air supply pipe, and a bottom aerator. The sedimentation tank is equipped with inclined plates and sludge discharge pipes at the bottom. One pipe is a sludge return pipe, which returns the sludge to the front end of the hydrolysis acidification tank, and the other pipe is a residual sludge discharge pipe, which discharges the residual sludge out of the system. The filtration tank adopts a double-layer filter media downflow filtration tank; The gas supply system mainly consists of gas supply equipment, gas supply pipes, and gas supply control valves. Each unit, including the anoxic pool, the micro-aerobic pool, and the aerobic pool, is equipped with a gas supply control valve.

2. The pulp wastewater treatment device coupled with MABR process according to claim 1, characterized in that: The number of MABR filler processing units is two or more, and the ratio of MABR membrane module to filler quantity is 1:1 to 1:

5.

3. The pulp wastewater treatment device coupled with MABR process according to claim 1, characterized in that: The dissolved oxygen concentration in the micro-aerobic tank is controlled at 0.5-1.5 mg / L. The number of MABR treatment units is one or more. The exhaust gas from the MABR membrane module is collected through the exhaust gas collection pipe and sent to the perforated aeration pipe at the bottom, and then discharged into the water body through the aeration holes.

4. The pulp wastewater treatment device coupled with MABR process according to claim 1, characterized in that: In the MBBR packing treatment unit, high-density polyethylene packing is selected for the MBBR packing, and the MBBR packing ratio is controlled at 1 / 2.

5. The pulp wastewater treatment device coupled with MABR process according to claim 1, characterized in that: The aerobic tank is equipped with a nitrification liquor recirculation system. The nitrification liquor is recirculated back to the front end of the anoxic tank through the nitrification liquor recirculation pipe, and the nitrification liquor recirculation ratio is controlled at 0-200%.

6. The pulp wastewater treatment device coupled with MABR process according to claim 1, characterized in that: The thickness of the upper filter media in the filtration tank is 600-1000mm, and the thickness of the lower filter media is 600-800mm.

7. The pulp wastewater treatment device coupled with MABR process according to claim 1, characterized in that: The hydraulic retention time in the anoxic tank is 6-12 hours, the hydraulic retention time in the microaerobic tank is 6-10 hours, and the hydraulic retention time in the aerobic tank is 10-16 hours.

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