Biological sewage treatment test device

Abstract

The utility model discloses a biological sewage treatment test device and belongs to the field of sewage treatment. The device comprises a plurality of reaction tanks which are sequentially communicated and a sedimentation tank, wherein the plurality of reaction tanks are sequentially a first reaction tank, a second reaction tank, a third reaction tank, a fourth reaction tank, a fifth reaction tank, a sixth reaction tank, a seventh reaction tank, an eighth reaction tank, a first aerobic tank, a second aerobic tank, an anoxic tank and a third aerobic tank; the adjacent reaction tanks can be communicated or disconnected; the reaction tanks are provided with connectors, valves are arranged on the connectors, and hoses are arranged on the connectors, so that the reaction tanks are communicated with one another, and the reaction tanks are communicated with the sedimentation tank, and different process modes are formed. According to the utility model, the operation conditions of the process can be changed, different operation processes can be switched, the function expansibility is very strong, and one set of device can be used for carrying out multiple sewage biological treatment tests.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment, specifically relating to a wastewater biological treatment experimental device. Background Technology

[0002] Wastewater treatment is of great significance for safeguarding human health, promoting economic development, and protecting the ecological environment. Effective wastewater treatment can reduce disease transmission, improve water resource utilization efficiency, and promote ecological balance and sustainable development. Biological treatment, which utilizes the metabolic activity of microorganisms to decompose organic matter, is one of the most important wastewater treatment methods, mainly including the activated sludge process and the biofilm process. However, the influent water quality varies from wastewater treatment plant to plant. Before large-scale design, pilot-scale tests can provide a preliminary assessment of the treatment process's effectiveness and feasibility, determining the optimal design parameters. Therefore, the development of a wastewater biological treatment pilot device with switchable process flows and adjustable operating parameters is essential. Utility Model Content

[0003] The purpose of this invention is to provide a wastewater biological treatment experimental device to facilitate wastewater treatment plants in conducting various process tests and evaluations.

[0004] The technical solution of this utility model is: a wastewater biological treatment experimental device, comprising multiple reaction tanks and a sedimentation tank connected in sequence. The multiple reaction tanks are, in sequence, a first reaction tank, a second reaction tank, a third reaction tank, a fourth reaction tank, a fifth reaction tank, a sixth reaction tank, a seventh reaction tank, an eighth reaction tank, a first aerobic tank, a second aerobic tank, an anoxic tank, and a third aerobic tank. Adjacent reaction tanks can be connected or disconnected. Each reaction tank is equipped with an interface and a valve. By installing flexible hoses on the interfaces, connections can be made between reaction tanks and between a reaction tank and a sedimentation tank, thereby forming different process modes. The first, second, third, fourth, fifth, sixth, seventh, and eighth reaction tanks can be used as pre-anoxic tanks, anaerobic tanks, anoxic tanks, or aerobic tanks, depending on the process mode.

[0005] As a further improvement of this utility model, in order to save space and rationally arrange the reaction tanks, the first reaction tank, the second reaction tank, the third reaction tank, the fourth reaction tank, the fifth reaction tank, the sixth reaction tank, the seventh reaction tank, and the eighth reaction tank are designed as a whole to form a first tank unit. The first tank unit is divided into the above-mentioned reaction tanks by multiple first partitions. The first partitions are provided with first connecting ports for connecting adjacent reaction tanks. A first insert plate is detachably connected to the first connecting port. The first aerobic tank, the second aerobic tank, the anoxic tank, and the third aerobic tank are designed as a whole to form a second tank unit. The second tank unit is divided into the above-mentioned reaction tanks by multiple second partitions. The second partitions are provided with second connecting ports for connecting adjacent reaction tanks. A second insert plate is detachably connected to the second connecting port.

[0006] As a further improvement of this utility model, the interfaces are specifically configured as follows: the first reaction tank is provided with a first unit A interface and a first unit B interface; the second reaction tank is provided with a first unit C interface; the third reaction tank is provided with a first unit D interface, a first unit E interface, and a first unit F interface; the fourth reaction tank is provided with a first unit G interface, a first unit H interface, and a first unit I interface; the fifth reaction tank is provided with a first unit J interface; the seventh reaction tank is provided with a first unit K interface and a first unit L interface; the eighth reaction tank is provided with a first unit M interface and a first unit N interface; the first aerobic tank is provided with a second unit A interface, a second unit B interface, and a second unit C interface; the second aerobic tank is provided with a second unit D interface and a second unit E interface; the anoxic tank is provided with a second unit F interface, a second unit G interface, a second unit H interface, and a second unit K interface; and the third aerobic tank is provided with a second unit I interface and a second unit J interface.

[0007] As a further improvement of this utility model, the sedimentation tank adopts a vertical flow sedimentation tank, with an intermediate guide tube at the top of the sedimentation tank, and the sedimentation tank is equipped with a sewage outlet, a sludge return outlet and a sludge outlet.

[0008] As a further improvement of this utility model, there are two or more sedimentation tanks, and each sedimentation tank is connected in parallel.

[0009] As a further improvement of this utility model, each reaction tank of the first pool unit is provided with a first sampling port, each reaction tank of the second pool unit is provided with a second sampling port, and the sedimentation tank is provided with a third sampling port. Valves are provided on the first sampling port, the second sampling port and the third sampling port.

[0010] The beneficial effects of this invention are: the device has a simple structure, rich functions, and flexible process adjustment methods. By connecting the interfaces between reaction tanks and installing the insert plates, the operating conditions can be changed, different operating processes can be switched, and it has strong functional expandability; one set of equipment can conduct multiple wastewater biological treatment experiments. Furthermore, this device is inexpensive, easy to transport and assemble, reusable, and freely combinable, making it highly valuable in the field of wastewater treatment. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of the wastewater biological treatment experimental device of this utility model;

[0012] Figure 2 This is a schematic diagram of the sedimentation tank in this utility model;

[0013] Figure 3 This is a structural diagram of the wastewater biological treatment experimental device of this utility model when it is used in the five-stage process mode;

[0014] Figure 4 This is a process flow diagram of the five-stage process mode of the wastewater biological treatment experimental device of this utility model.

[0015] Figure 5 This is a structural diagram of the wastewater biological treatment experimental device of this utility model when it is used in a multi-stage, multi-level AO process mode.

[0016] Figure 6 This is a process flow diagram of the wastewater biological treatment experimental device of this utility model when it is used in a multi-stage, multi-level AO process mode.

[0017] Figure 7 This is a structural diagram of the wastewater biological treatment experimental device of this utility model when it is used in MBBR process mode;

[0018] Figure 8 This is a process flow diagram of the wastewater biological treatment experimental device of this utility model when implementing the MBBR process mode.

[0019] In the diagram: 1-First tank unit; 101-First reaction tank; 102-Second reaction tank; 103-Third reaction tank; 104-Fourth reaction tank; 105-Fifth reaction tank; 106-Sixth reaction tank; 107-Seventh reaction tank; 108-Eighth reaction tank; 110-First partition; 120-First connecting port; 130-First insert plate; 140-Interception net; 2-Second tank unit; 201-First aerobic tank; 202-Second aerobic tank; 203-Anoxic tank; 204 - Third aerobic tank; 210- Second baffle; 220- Second connecting port; 3- Sedimentation tank; 301- Intermediate guide tube; 302- Trumpet mouth; 303- Reflector plate; 304- Sludge hopper; 305- Wastewater outlet; 306- Sludge return port; 307- Sludge outlet; 401- Wastewater inlet pump; 402- Carbon source dosing pump; 403- First nitrification liquid return pump; 404- Second nitrification liquid return pump; 405- Sludge return pump; 5- Chemical dosing tank; 601- First unit A interface; 6 02 - First Unit B Interface; 603 - First Unit C Interface; 604 - First Unit D Interface; 605 - First Unit E Interface; 606 - First Unit F Interface; 607 - First Unit G Interface; 608 - First Unit I Interface; 609 - First Unit J Interface; 610 - First Unit K Interface; 611 - First Unit L Interface; 612 - First Unit M Interface; 613 - First Unit N Interface; 614 - Second Unit A Interface; 615 - Second Unit B Interface; 6 16-Second Unit C Interface; 617-Second Unit D Interface; 618-Second Unit E Interface; 619-Second Unit F Interface; 620-Second Unit G Interface; 621-Second Unit H Interface; 622-Second Unit I Interface; 623-Second Unit J Interface; 624-First Unit H Interface; 625-Second Unit K Interface; 701-First Sampling Port; 702-Second Sampling Port; 703-Third Sampling Port; 8-Aeration Device; 9-Blower; 10-Agitator. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0021] Example 1

[0022] like Figure 1 , Figure 2As shown, a wastewater biological treatment experimental device includes multiple reaction tanks connected in sequence and a sedimentation tank 3. The multiple reaction tanks are, in sequence, a first reaction tank 101, a second reaction tank 102, a third reaction tank 103, a fourth reaction tank 104, a fifth reaction tank 105, a sixth reaction tank 106, a seventh reaction tank 107, an eighth reaction tank 108, a first aerobic tank 201, a second aerobic tank 202, an anoxic tank 203, and a third aerobic tank 204. Adjacent reaction tanks can be connected or disconnected. Each reaction tank is equipped with an interface and a valve. By installing flexible hoses on the interfaces, the reaction tanks can be connected to each other and to the sedimentation tank 3, thereby forming different process modes.

[0023] The first reaction tank 101, the second reaction tank 102, the third reaction tank 103, the fourth reaction tank 104, the fifth reaction tank 105, the sixth reaction tank 106, the seventh reaction tank 107, and the eighth reaction tank 108 are designed as a single unit, forming the first tank unit 1. The first tank unit 1 is divided into the above-mentioned reaction tanks by multiple first partitions 110. The first partitions 110 are provided with first connecting ports 120 for connecting adjacent reaction tanks. A first insert plate 130 is detachably connected to the first connecting port 120. The first aerobic tank 201, the second aerobic tank 202, the anoxic tank 203, and the third aerobic tank 204 are designed as a single unit, forming the second tank unit 2. The second tank unit 2 is divided into the above-mentioned reaction tanks by multiple second partitions 210. The second partitions 210 are provided with second connecting ports 220 for connecting adjacent reaction tanks. A second insert plate is detachably connected to the second connecting port 220.

[0024] The specific interface configurations are as follows: The first reaction tank 101 is equipped with a first unit A interface 601 and a first unit B interface 602; the second reaction tank 102 is equipped with a first unit C interface 603; the third reaction tank 103 is equipped with a first unit D interface 604, a first unit E interface 605, and a first unit F interface 606; the fourth reaction tank 104 is equipped with a first unit G interface 607, a first unit H interface 630, and a first unit I interface 608; the fifth reaction tank 105 is equipped with a first unit J interface 609; and the seventh reaction tank 107 is equipped with a first unit K interface 610 and a first unit L interface 606. Interface 611; The eighth reaction tank 108 is equipped with the first unit M interface 612 and the first unit N interface 613; The first aerobic tank 201 is equipped with the second unit A interface 614, the second unit B interface 615 and the second unit C interface 616; The second aerobic tank 202 is equipped with the second unit D interface 617 and the second unit E interface 618; The anoxic tank 203 is equipped with the second unit F interface 619, the second unit G interface 620, the second unit H interface 621 and the second unit K interface 625; The third aerobic tank 204 is equipped with the second unit I interface 622 and the second unit J interface 623.

[0025] Sedimentation tank 3 is a vertical flow sedimentation tank with dimensions of 1.5m diameter x 2.0m height. A 0.2m diameter intermediate guide tube 301 is installed at the top of sedimentation tank 3. A 0.2m x 0.3m funnel-shaped opening 302 is connected below the intermediate guide tube 301. The total length of the intermediate guide tube 301 and funnel-shaped opening 302 is 0.8m. A reflector plate 303 is connected to the lower end of the funnel-shaped opening 302. The lower end of the funnel-shaped opening 303 is 0.3m above the lower end of the reflector plate 303. A sludge discharge hopper 304 is located 0.3m below the lower end of the reflector plate 303, with an angle of 135° and a height of 0.6m. Sedimentation tank 3 has a wastewater outlet 305, a sludge return outlet 306, and a sludge outlet 307. The wastewater outlet 305 is 1.5m above the ground, the sludge return outlet 306 is 0.3m above the ground, and the sludge outlet 307 is 0.1m above the ground.

[0026] There are two or more sedimentation tanks 3, and each sedimentation tank 3 is connected in parallel.

[0027] Each reaction tank in the first tank unit 1 is provided with a first sampling port 701, each reaction tank in the second tank unit 2 is provided with a second sampling port 702, and the sedimentation tank 3 is provided with a third sampling port 703. Valves are provided on the first sampling port 701, the second sampling port 702 and the third sampling port 703.

[0028] The dimensions (length × width × height) of the first reaction tank 101 and the second reaction tank 102 are 1.0 m × 0.4 m × 1.8 m, respectively; the dimensions (length × width × height) of the third reaction tank 103, the fourth reaction tank 104, the fifth reaction tank 105, the sixth reaction tank 106, the seventh reaction tank 107, the eighth reaction tank 108, the first aerobic tank 201, and the second aerobic tank 202 are 1.0 m × 0.825 m × 1.8 m, respectively; the dimensions (length × width × height) of the anoxic tank 203 and the third aerobic tank 204 are 1.0 m × 0.7 m × 1.8 m, respectively.

[0029] Different process modes can be constructed by varying the connections between reaction tanks and between the reaction tank and sedimentation tank 3. This allows for changes in operating conditions and switching between different operating processes to meet the treatment load and hydraulic retention time requirements of different process modes. This experimental device can simulate three commonly used biological treatment processes: the modified five-stage process, the multi-stage AO process, and the MBBR process.

[0030] (I) Five-stage process mode

[0031] like Figure 3As shown, all first insert plates 130 and second insert plates are withdrawn. The first unit N interface 613 and the second unit A interface 614 are connected via a flexible hose. The output of the sewage inlet pump 401 is connected to the first unit A interface 601, the first unit C interface 603, the first unit D interface 604, and the second unit F interface 619, respectively. Shut-off valves and electromagnetic flow meters are installed on these inlet pipes. The second unit J interface 623 is connected to the intermediate guide tube 301 via a flexible hose. The second unit D interface 617 is connected to the first unit F interface 606 via a flexible hose, and a first nitrification liquid return pump 403, a shut-off valve, and an electromagnetic flow meter are installed between them. The second unit I interface 622 and the second unit H interface 621 are connected via a flexible hose, and a second nitrification liquid return pump 404, a shut-off valve, and an electromagnetic flow meter are installed between them. The sludge return port 306 is connected to the first unit B interface 602 via a flexible hose, and a sludge return pump 405, a shut-off valve, and an electromagnetic flow meter are installed between them. Chemical dosing... Box 5 is connected to the first unit's E interface 605 and the second unit's G interface 620 via a carbon source dosing pump 402. Shut-off valves and electromagnetic flow meters are installed on these dosing lines. The first reaction tank 101 serves as a pre-anoxic tank, the second reaction tank 102 as an anaerobic tank, and the third, fourth, fifth, and sixth reaction tanks 103, 104, 105, and 106 as anoxic tanks. The seventh and eighth reaction tanks 107 and 108 serve as aerobic tanks. The first reaction tank 101, the second... Agitators 10 are installed in reaction tanks 102, 103, 104, 105, 106, and 203 respectively; aeration devices 8 are installed in reaction tanks 107, 108, 201, 202, and 204 respectively. The aeration devices 8 are connected to blowers 9. Air volume regulating valves are installed on these air supply pipelines to regulate the air volume and ensure the dissolved oxygen content in these reaction tanks.

[0032] The wastewater treatment capacity is 10 m³ / d. The hydraulic retention time of the first reaction tank 101 is 1.44 h; the hydraulic retention time of the second reaction tank 102 is 1.44 h; the third reaction tank 103, the fourth reaction tank 104, the fifth reaction tank 105, and the sixth reaction tank 106 constitute the anoxic tank group with a hydraulic retention time of 11.88 h; the seventh reaction tank 107, the eighth reaction tank 108, the first aerobic tank 201, and the second aerobic tank 202 constitute the aerobic tank group with a hydraulic retention time of 11.88 h; the hydraulic retention time of the anoxic tank 203 is 2.52 h; and the hydraulic retention time of the third aerobic tank 204 is 2.52 h.

[0033] Raw wastewater, after passing through wastewater inlet pump 401, enters the first reaction tank 101, the second reaction tank 102, the third reaction tank 103, and the anoxic tank 203 via the first unit A interface 601, the first unit C interface 603, the first unit D interface 604, and the second unit F interface 619. The inflow rate can be adjusted by the shut-off valve on the inlet pipeline, and the electromagnetic flowmeter on the inlet pipeline records the flow rate entering each reaction tank. This operation optimizes the wastewater inlet location and flow rate. After treatment in the first reaction tank 101, the second reaction tank 102, the anoxic tank group, the aerobic tank group, the anoxic tank 203, the third aerobic tank 204, and the sedimentation tank 3, the raw wastewater flows out through wastewater outlet 305. The process flow is as follows: Figure 4 As shown.

[0034] By constructing an anoxic tank group from reaction tanks 103, 104, 105, and 106, and an aerobic tank group from reaction tanks 107, 108, 201, and 202, and reducing the hydraulic retention time of both the anoxic and aerobic tank groups, and by inserting the first insert plate 130 between reaction tanks 104 and 105, and between reaction tanks 106 and 107, and connecting the first unit I interface 608 and K interface 610 via hoses, wastewater flows from reaction tank 104 into reaction tank 107. The hydraulic retention time of the anoxic tank group is then 5.94 hours. Insert the first insert plate 130 between the fifth reaction tank 105 and the sixth reaction tank 106, and insert the first insert plate 130 between the sixth reaction tank 106 and the seventh reaction tank 107. Connect the first unit J interface 609 and the first unit K interface 610 through a hose. Wastewater flows from the fifth reaction tank 105 into the seventh reaction tank 107, and the hydraulic retention time of the anoxic tank group is 8.91 hours. Insert the second insert plate between the second aerobic tank 202 and the anoxic tank 203, and connect the first unit N interface 613 and the second unit K interface 625 through a hose. Wastewater flows from the eighth reaction tank 108 into the anoxic tank 203, and the hydraulic retention time of the aerobic tank group is 5.94 hours. Inserting the second insert plate between the first aerobic tank 201 and the second aerobic tank 202, and inserting the second insert plate between the second aerobic tank 202 and the anoxic tank 203, and connecting the second unit C interface 616 and the second unit K interface 625 through a hose, the sewage flows from the first aerobic tank 201 into the anoxic tank 203, resulting in a hydraulic retention time of 8.91 hours for the aerobic tank group. Inserting the second insert plate between the second aerobic tank 202 and the anoxic tank 203, and connecting the second unit E interface 618 to the intermediate guide tube 301 through a hose, the sewage flows from the second aerobic tank 202 into the sedimentation tank 3, thus reducing the hydraulic retention time of the anoxic tank 203 and the third aerobic tank 204.

[0035] The sludge returned from sedimentation tank 3 enters the first reaction tank 101 through the sludge return port 306 via the sludge return pump 405 from the first unit B interface 602. The amount of sludge returned can be adjusted by the shut-off valve on the pipeline, and the electromagnetic flow meter on the pipeline records the amount of sludge returned. This operation can optimize the sludge return flow rate.

[0036] Wastewater flowing back from the second aerobic tank 202 enters the third reaction tank 103 through the first nitrification liquid return pump 403 via the second unit D interface 617 and the first unit F interface 606. If wastewater flows from the eighth reaction tank 108 into the anoxic tank 203, the first unit M interface 612 is connected to the first nitrification liquid return pump 403, and the wastewater flowing back from the eighth reaction tank 108 flows through the first unit M interface 612 and the first nitrification liquid return pump 403, entering the third reaction tank 103 through the first unit F interface 606. If wastewater flows from the first aerobic tank 201 into the anoxic tank 203, the second unit B interface 615 is connected to the first nitrification liquid return pump 403, and the wastewater flowing back from the first aerobic tank 201 flows through the second unit B interface 615 and the first nitrification liquid return pump 403, entering the third reaction tank 103 through the first unit F interface 606. The amount of internally returned wastewater can be adjusted by the shut-off valve on the return pipeline, and the electromagnetic flowmeter on the return pipeline records the amount of internally returned wastewater. This operation can optimize the internal return flow from the aerobic tank group to the third reaction tank 103.

[0037] The wastewater returning from the third aerobic tank 204 enters the anoxic tank 203 through the second unit I interface 622 via the second nitrification liquid return pump 404 from the second unit H interface 621. The amount of wastewater returning from the third aerobic tank 204 can be adjusted by the shut-off valve on the return pipeline. The electromagnetic flowmeter on the return pipeline records the amount of wastewater returning from the third aerobic tank 204 to the anoxic tank 203. This operation can optimize the internal return flow rate from the third aerobic tank 204 to the anoxic tank 203.

[0038] The carbon source enters the third reaction tank 103 and the anoxic tank 203 through the dosing tank 5 and the carbon source dosing pump 402 via the first unit E interface 605 and the second unit G interface 620, respectively. The carbon source is regulated by the shut-off valve on the dosing pipeline, and the carbon source dosing amount is recorded by the electromagnetic flowmeter on the dosing pipeline. This operation can optimize the carbon source dosing amount and determine the carbon source dosing location.

[0039] The remaining sludge from sedimentation tank 3 is discharged through sludge outlet 307, and the wastewater is discharged through wastewater outlet 305.

[0040] The first sampling port 701, the second sampling port 702, and the third sampling port 703 can sample sewage at any location to test the treatment effect.

[0041] Under this process mode, the experimental device of this utility model can change the effective volume of the improved five-stage method and conduct experiments and optimizations on the inlet water position and inlet water ratio, hydraulic retention time, sludge return flow rate, sewage internal return flow rate and carbon source dosage.

[0042] (ii) Multi-stage and multi-level AO process mode

[0043] like Figure 5 As shown, all first insert plates 130 are withdrawn, and the second tank unit 2 is not used; the output end of the sewage inlet pump 401 is connected to the first unit A interface 601, the first unit G interface 607, and the first unit K interface 610 respectively, and a shut-off valve and an electromagnetic flow meter are installed on these inlet pipes; the first unit N interface 613 is connected to the intermediate guide tube 301 through a hose and a shut-off valve is installed in between; the sludge return port 306 is connected to the first unit B interface 602 through a hose and a sludge return pump 405, a shut-off valve, and an electromagnetic flow meter are installed in between; the dosing tank 5 is connected to the first unit L interface 611 through the carbon source dosing pump 402, and a shut-off valve and an electromagnetic flow meter are installed on the dosing pipe; The first reaction tank 101 and the second reaction tank 102 are both anaerobic tanks, the third reaction tank 103, the sixth reaction tank 106, and the eighth reaction tank 108 are all aerobic tanks, and the fourth reaction tank 104, the fifth reaction tank 105, and the seventh reaction tank 107 are all anoxic tanks. Each of the first reaction tank 101, the second reaction tank 102, the fourth reaction tank 104, the fifth reaction tank 105, and the seventh reaction tank 107 is equipped with a stirrer 10. Each of the third reaction tank 103, the sixth reaction tank 106, and the eighth reaction tank 108 is equipped with an aeration device 8, which is connected to a blower 9. Air volume regulating valves are installed on these air supply pipelines to regulate the air volume and ensure the dissolved oxygen content in these reaction tanks.

[0044] The wastewater treatment capacity is 10 m³ / d. The first reaction tank 101 and the second reaction tank 102 constitute an anaerobic tank group with a hydraulic retention time of 2.88 h; the third reaction tank 103 has a hydraulic retention time of 2.97 h; the fourth reaction tank 104 and the fifth reaction tank 105 constitute an anoxic tank group with a hydraulic retention time of 5.94 h; the sixth reaction tank 106 has a hydraulic retention time of 2.97 h; the seventh reaction tank 107 has a hydraulic retention time of 2.97 h; and the eighth reaction tank 108 has a hydraulic retention time of 2.97 h.

[0045] Raw wastewater, after passing through wastewater inlet pump 401, enters the first reaction tank 101, the fourth reaction tank 104, and the seventh reaction tank 107 respectively via the first unit A interface 601, the first unit G interface 607, and the first unit K interface 610. The inflow rate can be adjusted by the shut-off valve on the inlet pipeline, and the electromagnetic flowmeter on the inlet pipeline records the flow rate entering each reaction tank. This operation optimizes the wastewater inlet location and flow rate. After being treated by the anaerobic tank group, the third reaction tank 103, the anoxic tank group, the sixth reaction tank 106, the seventh reaction tank 107, the eighth reaction tank 108, and the sedimentation tank 3, the raw wastewater flows out through wastewater outlet 305. The process flow is as follows: Figure 6 As shown.

[0046] The optimal hydraulic retention time is tested by adjusting the amount of wastewater entering the experimental device of this invention.

[0047] The sludge returned from sedimentation tank 3 enters the first reaction tank 101 through the sludge return port 306 via the sludge return pump 405 from the first unit B interface 602. The amount of sludge returned can be adjusted by the shut-off valve on the pipeline, and the electromagnetic flow meter on the pipeline records the amount of sludge returned. This operation can optimize the sludge return flow rate.

[0048] The carbon source enters the seventh reaction tank 107 through the dosing tank 5 and the carbon source dosing pump 402 via the L interface 611 of the first unit. The carbon source is regulated by the shut-off valve on the dosing pipeline, and the electromagnetic flowmeter on the dosing pipeline records the carbon source dosage. This operation can optimize the carbon source dosage.

[0049] The remaining sludge from sedimentation tank 3 is discharged through sludge outlet 307, and the wastewater is discharged through wastewater outlet 305.

[0050] The first sampling port 701 and the third sampling port 703 can sample sewage at any location to test the treatment effect.

[0051] Under this process mode, the experimental device of this utility model can test and optimize the inlet position and inlet ratio, hydraulic retention time, sludge return flow rate, and carbon source dosage in multiple stages and levels.

[0052] (III) MBBR (Moving Bed Biofilm Reactor) Process Mode

[0053] like Figure 7As shown, intercepting nets 140 are installed at the first connection port 120 between the first reaction tank 101 and the second reaction tank 102, the first connection port 120 between the second reaction tank 102 and the third reaction tank 103, and the first connection port 120 between the third reaction tank 103 and the fourth reaction tank 104, respectively. The intercepting nets 140 have a mesh size of 15mm. A first insert plate 130 is installed at the first connection port 120 between the fourth reaction tank 104 and the fifth reaction tank 105. The fifth reaction tank 105, the sixth reaction tank 106, the seventh reaction tank 107, the eighth reaction tank 108, the first aerobic tank 201, the second aerobic tank 202, the anoxic tank 203, and the third aerobic tank 204 are not used. The output end of the sewage inlet pump 401 is connected to the first unit A interface 601, the first unit C interface 603, and the first unit D interface 604, respectively. Shut-off valves and electromagnetic flow meters are installed on these inlet pipes. The first unit I interface 608 and the intermediate guide tube 3 The first unit's H port 630 and the first unit's F port 606 are connected by a hose, with a first nitrification liquid return pump 403, a shut-off valve, and an electromagnetic flow meter installed between them; the sludge return port 306 and the first unit's B port 602 are connected by a hose, with a sludge return pump 405, a shut-off valve, and an electromagnetic flow meter installed between them; the dosing tank 5 is connected to the first unit's E port 605 via a carbon source dosing pump 402, and a shut-off valve and an electromagnetic flow meter are installed on the dosing pipeline. Flow meter; the first reaction tank 101 serves as a pre-anoxic tank, the second reaction tank 102 serves as an anaerobic tank, the third reaction tank 103 serves as an anoxic tank, and the fourth reaction tank 104 serves as an aerobic tank; the first reaction tank 101, the second reaction tank 102, and the third reaction tank 103 are each equipped with a stirrer 10; the fourth reaction tank 104 is equipped with an aeration device 8, which is connected to a blower 9. An air volume regulating valve is provided on the air supply pipeline to regulate the air volume and ensure the dissolved oxygen content in the reaction tank.

[0054] The wastewater treatment capacity is 10 m³ / d. The hydraulic retention time of the first reaction tank 101 is 1.44 h; the hydraulic retention time of the second reaction tank 102 is 1.44 h; the hydraulic retention time of the third reaction tank 103 is 2.97 h; and the hydraulic retention time of the fourth reaction tank 104 is 2.97 h.

[0055] The first reaction tank 101, the second reaction tank 102, the third reaction tank 103, and the fourth reaction tank 104 are all filled with packing material (high-density polyethylene suspended carrier packing material). The nitration rate of the packing material is 0.5 g N / (㎡.d), and the oxidation rate of organic matter is 10 g COD / (㎡.d).

[0056] Raw wastewater, after passing through wastewater inlet pump 401, enters the first reaction tank 101, the second reaction tank 102, and the third reaction tank 103 respectively via interface A 601, interface C 603, and interface D 604 of the first unit. The inflow rate can be adjusted by the shut-off valve on the inlet pipeline, and the electromagnetic flowmeter on the inlet pipeline records the flow rate entering each reaction tank. This operation optimizes the wastewater inlet location and flow rate. After treatment in the first reaction tank 101, the second reaction tank 102, the third reaction tank 103, the fourth reaction tank 104, and the sedimentation tank 3, the raw wastewater flows out through wastewater outlet 305. The process flow is as follows: Figure 8 As shown.

[0057] The optimal packing load is determined by adjusting the amount of wastewater entering the test device of this invention.

[0058] The sludge returned from sedimentation tank 3 enters the first reaction tank 101 through the sludge return port 306 via the sludge return pump 405 from the first unit B interface 602. The amount of sludge returned can be adjusted by the shut-off valve on the pipeline, and the electromagnetic flow meter on the pipeline records the amount of sludge returned. This operation can optimize the sludge return flow rate.

[0059] Wastewater returning from the fourth reaction tank 104 enters the third reaction tank 103 via the first unit's H port 630 and the first nitrification liquid return pump 403 from the first unit's F port 606. The amount of wastewater returning internally can be adjusted by a shut-off valve on the return pipeline, and an electromagnetic flowmeter on the return pipeline records the amount of wastewater returning internally. This operation optimizes the internal return flow rate from the fourth reaction tank 104 to the third reaction tank 103.

[0060] The carbon source enters the third reaction tank 103 through the dosing tank 5 and the carbon source dosing pump 402 via the first unit E interface 605. The carbon source is regulated by the shut-off valve on the dosing pipeline, and the carbon source dosing amount is recorded by the electromagnetic flow meter on the dosing pipeline. This operation can optimize the carbon source dosing amount.

[0061] The remaining sludge from sedimentation tank 3 is discharged through sludge outlet 307, and the wastewater is discharged through wastewater outlet 305.

[0062] The first sampling port 701 and the third sampling port 703 can sample sewage at any location to test the treatment effect.

[0063] Under this process mode, the experimental device of this utility model can test and optimize the influent location and ratio, packing load, sludge return flow rate, wastewater internal return flow rate, and carbon source dosage of the MBBR process.

[0064] This invention enables convenient switching between improved five-stage process, multi-stage multi-level AO process, and MBBR process. It allows for testing and optimization of influent location and ratio, hydraulic retention time, external sludge return flow, internal wastewater return flow, carbon source addition location and dosage, and packing load under each process mode. The experimental device of this invention is simple in structure, feature-rich, and inexpensive. Its process adjustment methods are flexible. Before large-scale design, this experimental device can be used to preliminarily evaluate the effectiveness and feasibility of the treatment process and determine the optimal design parameters, making it highly valuable in the field of wastewater treatment design.

Claims

1. A wastewater biological treatment experimental device, characterized in that: It includes multiple reaction tanks connected in sequence and a sedimentation tank (3). The multiple reaction tanks are, in sequence, the first reaction tank (101), the second reaction tank (102), the third reaction tank (103), the fourth reaction tank (104), the fifth reaction tank (105), the sixth reaction tank (106), the seventh reaction tank (107), the eighth reaction tank (108), the first aerobic tank (201), the second aerobic tank (202), the anoxic tank (203), and the third aerobic tank (204). Adjacent reaction tanks can be connected or disconnected. The reaction tanks are equipped with interfaces and valves. By installing hoses on the interfaces, the reaction tanks can be connected to each other and to the sedimentation tank (3), thereby forming different process modes.

2. The wastewater biological treatment experimental device according to claim 1, characterized in that: The first reaction tank (101), the second reaction tank (102), the third reaction tank (103), the fourth reaction tank (104), the fifth reaction tank (105), the sixth reaction tank (106), the seventh reaction tank (107), and the eighth reaction tank (108) are designed as a single unit, forming a first tank unit (1). The first tank unit (1) is divided into the above-mentioned reaction tanks by multiple first partitions (110). The first partitions (110) are provided with first connecting ports (120) for connecting adjacent reaction tanks. A first insert plate (130) is detachably connected to a connecting port (120); the first aerobic tank (201), the second aerobic tank (202), the anoxic tank (203), and the third aerobic tank (204) are designed as a whole to form a second tank unit (2). The second tank unit (2) is divided into the above-mentioned reaction tanks by multiple second partitions (210). The second partition (210) is provided with a second connecting port (220) for connecting adjacent reaction tanks. A second insert plate is detachably connected to the second connecting port (220).

3. The wastewater biological treatment experimental device according to claim 2, characterized in that: The interfaces are specifically configured as follows: the first reaction tank (101) is provided with a first unit A interface (601) and a first unit B interface (602); the second reaction tank (102) is provided with a first unit C interface (603); the third reaction tank (103) is provided with a first unit D interface (604), a first unit E interface (605), and a first unit F interface (606); the fourth reaction tank (104) is provided with a first unit G interface (607), a first unit H interface (630), and a first unit I interface (608); the fifth reaction tank (105) is provided with a first unit J interface (609); and the seventh reaction tank (107) is provided with a first unit K interface (610) and a first unit L interface. The eighth reaction tank (108) is equipped with the first unit M interface (612) and the first unit N interface (613); the first aerobic tank (201) is equipped with the second unit A interface (614), the second unit B interface (615) and the second unit C interface (616); the second aerobic tank (202) is equipped with the second unit D interface (617) and the second unit E interface (618); the anoxic tank (203) is equipped with the second unit F interface (619), the second unit G interface (620), the second unit H interface (621) and the second unit K interface (625); the third aerobic tank (204) is equipped with the second unit I interface (622) and the second unit J interface (623).

4. The wastewater biological treatment experimental device according to claim 3, characterized in that: The sedimentation tank (3) is a vertical flow sedimentation tank. The upper part of the sedimentation tank (3) is provided with a middle guide tube (301). The sedimentation tank (3) is provided with a sewage outlet (305), a sludge return port (306) and a sludge outlet (307).

5. The wastewater biological treatment experimental device according to claim 4, characterized in that: There are two or more sedimentation tanks (3), and each sedimentation tank (3) is connected in parallel.

6. A wastewater biological treatment experimental device according to any one of claims 2-5, characterized in that: Each reaction tank of the first tank unit (1) is provided with a first sampling port (701), each reaction tank of the second tank unit (2) is provided with a second sampling port (702), and the sedimentation tank (3) is provided with a third sampling port (703). Valves are provided on the first sampling port (701), the second sampling port (702) and the third sampling port (703).

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