Air floatation test device for solid-liquid separation of biogas slurry

Abstract

The utility model discloses an air flotation test device for solid-liquid separation of biogas slurry, which relates to the technical field of anaerobic fermentation product treatment and comprises an air flotation tank, a water collecting tank, a residue collecting tank, a residue scraping mechanism, a reflux pump, a bubble machine and a bubble water releaser, the water collecting tank is communicated with the air flotation tank, and the water collecting tank can receive residue-removed biogas slurry in the air flotation tank; the bubble water releaser is fixedly arranged in the treated biogas slurry in the air flotation tank and can fill bubble water into the treated biogas slurry, a liquid inlet of the reflux pump is communicated with the water collecting tank, a liquid outlet of the reflux pump is communicated with a liquid inlet of the bubble machine, a liquid outlet of the bubble machine is communicated with the bubble water releaser, and the bubble water releaser is communicated with the water collecting tank. The slag collecting tank is fixedly arranged at the top of the inner side wall of the air floatation tank, the slag scraping mechanism is arranged above the air floatation tank, and the slag scraping mechanism can scrape biogas residues on the liquid level of treated biogas slurry in the air floatation tank into the slag collecting tank; according to the utility model, reliable evaluation and pre-estimation can be provided for the actual removal effect of the biogas residue in the biogas slurry doped with the biogas residue by the air flotation equipment.

Description

Technical Field

[0001] This utility model relates to the field of anaerobic fermentation product treatment technology, and in particular to an air flotation test device for solid-liquid separation of biogas slurry. Background Technology

[0002] During the wet anaerobic fermentation process, a large amount of biogas slurry is produced as a fermentation product. This slurry is easily mixed with a significant amount of fine biogas residue. Directly returning this biogas slurry mixed with residue to the field can lead to poor crop growth, even causing seedling burn and yield reduction. Therefore, it is necessary to perform solid-liquid separation treatment on the biogas slurry mixed with residue.

[0003] Air flotation technology is a physical method that can achieve solid-liquid separation or liquid-liquid separation. It can treat water efficiently and in an environmentally friendly manner and has been widely used.

[0004] Currently, there is an urgent need for an experimental device to study the treatment effect of air flotation technology on biogas slurry mixed with biogas residue, so as to facilitate the application of air flotation technology to biogas slurry treatment. Utility Model Content

[0005] The purpose of this invention is to provide an air flotation test device for solid-liquid separation of biogas slurry, so as to solve the problems existing in the prior art and provide a reliable assessment and prediction of the actual removal effect of biogas residue in biogas slurry mixed with biogas residue by air flotation equipment.

[0006] To achieve the above objectives, this utility model provides the following solution:

[0007] This utility model provides a flotation test device for solid-liquid separation of biogas slurry, including a flotation tank, a water collection tank, a sludge collection trough, a sludge scraping mechanism, a reflux pump, an aerator, and an aerator. The flotation tank can hold the biogas slurry to be treated. The water collection tank is connected to the flotation tank, and a filter screen is fixedly installed at the connection between the water collection tank and the flotation tank. The water collection tank can receive the biogas slurry with sludge removed from the flotation tank. The aerator is fixedly installed in the biogas slurry to be treated in the flotation tank and can fill the biogas slurry with aerator. The inlet of the reflux pump is connected to the water collection tank, and the outlet of the reflux pump is connected to the inlet of the aerator. The outlet of the aerator is connected to the aerator. The sludge collection trough is fixedly installed on the top of the inner wall of the flotation tank. The sludge scraping mechanism is located above the flotation tank and can scrape the biogas sludge on the surface of the biogas slurry to be treated into the sludge collection trough.

[0008] Preferably, the device further includes a bubble water pipe and a pressure gauge. The first end of the bubble water pipe is fixedly connected to and communicates with the outlet of the bubble machine, and the second end of the bubble water pipe is fixedly connected to and communicates with the bubble water releaser. The bubble water pipe is equipped with a regulating valve, which is located outside the flotation tank. The regulating valve can regulate the flow rate and pressure of the bubble water in the bubble water pipe. The pressure gauge is fixedly installed on the bubble water pipe and is located between the regulating valve and the flotation tank. The pressure gauge can detect the pressure of the bubble water in the bubble water pipe.

[0009] Preferably, the bubble water release device is fixedly installed at the center of the flotation tank. The bubble water release device includes three first bubble water release heads. The top of the first bubble water release head is open to allow bubble water to be filled upwards, and the bottom of the first bubble water release head is open to allow bubble water to be filled downwards. The middle of the side of one of the first bubble water release heads is fixedly connected and communicates with the second end face of the bubble water pipe. Two first bubble water release heads are symmetrically arranged about the center line of the second end of the bubble water pipe, and the middle of the side of the two first bubble water release heads is fixedly connected and communicates with the side of the second end of the bubble water pipe.

[0010] Preferably, a first partition plate is fixedly provided at the bottom of the flotation tank, dividing the interior of the flotation tank into a first flotation zone and a second flotation zone. The second flotation zone accommodates the bubble water release device. The bubble water pipe has a branch pipe, and a second bubble water release head is fixedly provided on the branch pipe. The top of the second bubble water release head is open to allow bubble water to be filled upwards. The second bubble water release head is located at the bottom of the first flotation zone. A second partition plate is fixedly provided between the water collection tank and the second flotation zone. The second partition plate has several water permeable holes, which allow the water collection tank to communicate with the second flotation zone. A filter screen is fixedly provided on the second partition plate, and the filter screen covers each of the water permeable holes.

[0011] Preferably, it also includes a return suction head and a return pipe. The return suction head is fixedly installed in the water collection tank. One end of the return pipe is fixedly connected to and communicates with the return suction head, and the other end of the return pipe is fixedly connected to and communicates with the inlet of the return pump.

[0012] Preferably, it further includes a first flocculation reaction tank and a second flocculation reaction tank, wherein the first flocculation reaction tank is used to add a first agent and the second flocculation reaction tank is used to add a second agent; the fluid in the first flocculation reaction tank can overflow into the second flocculation reaction tank and the fluid in the second flocculation reaction tank can overflow into the flotation tank.

[0013] Preferably, the system further includes a first agitator and a second agitator. The first agitator is disposed on the first flocculation reaction tank and is capable of agitating the fluid in the first flocculation reaction tank. The second agitator is disposed on the second flocculation reaction tank and is capable of agitating the fluid in the second flocculation reaction tank.

[0014] Preferably, it further includes an outlet tank, an inlet tank, an inlet pump, and an inlet pipe. The outlet tank is located below the water collection tank and can receive the sludge-removed biogas slurry discharged from the water collection tank. The inlet tank is used to store the biogas slurry to be treated. One end of the inlet pipe is fixedly connected to and communicates with the inlet tank, and the other end of the inlet pipe is fixedly connected to and communicates with the bottom of the first flocculation reaction tank. The bottom of the first flocculation reaction tank is provided with a first dosing port, and the top of the second flocculation reaction tank is provided with a second dosing port.

[0015] Preferably, the system further includes an electrical control box, which is equipped with a slag scraping mechanism start button, a slag scraping mechanism stop button, a liquid inlet pump start button, a liquid inlet pump stop button, a stirring start button, a stirring stop button, a dissolved gas start button, a dissolved gas stop button, and a handle. The slag scraping mechanism start button and the slag scraping mechanism stop button are connected to the slag scraping mechanism and can control the operation of the slag scraping mechanism. The liquid inlet pump start button and the liquid inlet pump stop button are connected to the liquid inlet pump and can control the operation of the liquid inlet pump. The stirring start button and the stirring stop button are connected to the first stirrer and the second stirrer and can control the operation of the first stirrer and the second stirrer. The dissolved gas start button and the dissolved gas stop button are connected to the reflux pump and the aerator and can control the operation of the reflux pump and the aerator.

[0016] Preferably, the vehicle also includes a frame and several wheels. The flotation tank, the water collection tank, the sludge collection tank, the first flocculation reaction tank, the second flocculation reaction tank, the liquid outlet tank, the liquid inlet tank, and the electrical control box are all fixedly mounted on the frame, and each wheel is located at the bottom of the frame.

[0017] The present invention achieves the following technical advantages over the prior art:

[0018] This invention provides an air flotation test device for solid-liquid separation of biogas slurry. The device uses an air flotation tank to hold the biogas slurry to be treated, and a collection tank to receive the deslagging biogas slurry from the flotation tank. A return pump draws a portion of the deslagging biogas slurry from the collection tank into an aerator. The biogas slurry returning to the aerator dissolves air and forms saturated aerated water (dissolved air water) under the action of the aerator. This aerated water is then released into the biogas slurry in the flotation tank via an aerator, releasing a large number of bubbles. The biogas residue mixed in the biogas slurry adheres to the bubbles and rises with them to the treated biogas slurry. The biogas sludge is scraped onto the surface of the biogas sludge in the flotation tank and then scraped into the sludge collection tank by a sludge scraping mechanism, thus completing the separation of biogas sludge and biogas sludge in the flotation tank. Therefore, the flotation test device for solid-liquid separation of biogas sludge provided by this utility model can simulate the generation of microbubbles in the flotation tank and the adsorption effect of microbubbles on the suspended matter of biogas sludge during the rising process. The design of the flotation tank and its supporting structure is similar to that of actual flotation equipment, providing a reliable assessment and prediction of the actual removal effect of biogas sludge in biogas sludge mixed with biogas sludge by the flotation equipment. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A schematic diagram of the air flotation test device for solid-liquid separation of biogas slurry provided by this utility model;

[0021] Figure 2 A top view schematic diagram of the air flotation tank in the air flotation test device for solid-liquid separation of biogas slurry provided by this utility model;

[0022] Figure 3 for Figure 1 The diagram shows the control valve and pressure indication;

[0023] Figure 4 for Figure 1 Schematic diagram of the electrical control box in the middle;

[0024] In the diagram: 1-Air flotation tank, 2-Water collection tank, 3-Sludge collection trough, 4-Sludge scraping mechanism, 5-Recirculation pump, 6-Aerator, 7-Aerator water releaser, 8-Aerator water pipe, 9-Regulating valve, 10-Pressure gauge, 11-Recirculation suction head, 12-Recirculation pipe, 13-First flocculation reaction tank, 14-Second flocculation reaction tank, 15-First agitator, 16-Second agitator, 17-Outlet tank, 18-Inlet tank, 19-Inlet pump, 20-Inlet pipe, 21-Electrical control box, 22-Inlet pump off button, 23-Inlet pump on button, 24-Sludge scraping mechanism off button, 25-Sludge scraping mechanism on button, 26-Agitator off button, 27-Agitator on button, 28-Dissolved air off button, 29-Dissolved air on button, 30-Handle, 31-Frame, 32-Wheel, 33-First partition plate, 34-Second aerator water release head. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] The purpose of this invention is to provide an air flotation test device for solid-liquid separation of biogas slurry, so as to solve the problems existing in the prior art and provide a reliable assessment and prediction of the actual removal effect of biogas residue in biogas slurry mixed with biogas residue by air flotation equipment.

[0027] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] like Figures 1 to 4 As shown, this utility model provides an air flotation test device for solid-liquid separation of biogas slurry, including an air flotation tank 1, a water collection tank 2, a sludge collection tank 3, a sludge scraping mechanism 4, a return pump 5, an aerator 6, and an aerator 7. The air flotation tank 1 can hold the biogas slurry to be treated. The water collection tank 2 is connected to the air flotation tank 1, and a filter screen is fixedly installed at the connection between the water collection tank 2 and the air flotation tank 1. The water collection tank 2 can receive the sludge-removed biogas slurry in the air flotation tank 1. The aerator 7 is fixedly installed in the air flotation tank 1. In the treated biogas slurry, the bubble water releaser 7 can fill the treated biogas slurry with bubble water. The inlet of the return pump 5 is connected to the collection tank 2, the outlet of the return pump 5 is connected to the inlet of the bubble machine 6, and the outlet of the bubble machine 6 is connected to the bubble water releaser 7. The sludge collection tank 3 is fixedly installed on the top of the inner wall of the flotation tank 1. The sludge scraping mechanism 4 is installed above the flotation tank 1. The sludge scraping mechanism 4 can scrape the biogas sludge on the surface of the treated biogas slurry in the flotation tank 1 into the sludge collection tank 3.

[0029] The flotation test device for solid-liquid separation of biogas slurry provided by this utility model contains biogas slurry to be treated in a flotation tank 1, and receives the deslagging biogas slurry from the flotation tank 1 in a collection tank 2. A portion of the deslagging biogas slurry in the collection tank 2 is pumped to an aerator 6 by a return pump 5. The biogas slurry returning to the aerator 6 dissolves air under the action of the aerator 6 and forms saturated bubble water (dissolved air water). Then, the bubble water is released into the biogas slurry contained in the flotation tank 1 through a bubble water releaser 7, releasing a large number of bubbles. The biogas residue mixed in the biogas slurry adheres to the bubbles and rises with the bubbles to the surface. On the surface of the treated biogas slurry, the biogas residue on the surface of the treated biogas slurry in the flotation tank 1 is scraped into the sludge collection tank 3 by the sludge scraping mechanism 4, thus completing the separation of biogas slurry and biogas residue in the treated biogas slurry in the flotation tank 1. Therefore, the flotation test device for solid-liquid separation of biogas slurry provided by this utility model can simulate the generation of microbubbles in the flotation tank 1 and the adsorption effect of microbubbles on the suspended matter of biogas residue during the rising process. The design of the flotation tank 1 and its supporting structure is similar to that of the actual flotation equipment, providing a reliable assessment and prediction of the actual removal effect of biogas residue in biogas slurry mixed with biogas residue by the flotation equipment.

[0030] In a preferred embodiment of this invention, the reflux pump 5 is a magnetically driven circulating pump, the bubble machine 6 is a micro-nano bubble device, and the sludge scraping mechanism 4 includes a sludge scraping motor, a drive shaft, a driven shaft, and a sludge scraping plate. The sludge scraping motor is connected to the drive shaft and drives the drive shaft to rotate. The drive shaft and the driven shaft are arranged side by side. The drive shaft is equipped with two drive gears, and the driven shaft is equipped with two driven gears. The driven gears correspond one-to-one with the drive gears, and the drive gears and driven gears are driven by a chain. The sludge scraping plate is fixedly mounted on the chain. When the sludge scraping motor is working, the drive gear drives the chain and driven gears to rotate. During the rotation of the chain, the scraper scrapes the sludge on the surface of the treated biogas slurry in the flotation tank 1 into the sludge collection tank 3.

[0031] Furthermore, the flotation test device for solid-liquid separation of biogas slurry provided by this utility model also includes a bubble water pipe 8 and a pressure gauge 10. The first end of the bubble water pipe 8 is fixedly connected to and communicates with the outlet of the bubble machine 6, and the second end of the bubble water pipe 8 is fixedly connected to and communicates with the bubble water release device 7. A regulating valve 9 is provided on the bubble water pipe 8. The regulating valve 9 is placed outside the flotation tank 1. The regulating valve 9 can regulate the flow rate and pressure of the bubble water in the bubble water pipe 8, so as to simulate and study the adsorption effect of bubble water at different pressures on the suspended solids of biogas slurry when it is filled into the flotation tank 1. The pressure gauge 10 is fixedly installed on the bubble water pipe 8. The pressure gauge 10 is placed between the regulating valve 9 and the flotation tank 1. The pressure gauge 10 can detect the pressure of the bubble water in the bubble water pipe 8. The pressure gauge 10 is preferably made of stainless steel. The regulating valve 9 is preferably, but not limited to, a union three-way T-type ball valve, and is installed on the aerated water pipe 8 via a union 4-point fully internal thread adapter. In this embodiment, the main body of the union three-way T-type ball valve is made of brass, and its nut size is 4 points 20mm. It has three interfaces: two external thread interfaces and one internal thread interface. The union 4-point fully internal thread adapter is also made of brass, and its nut size is 4 points 20mm. The internal thread interface of the union three-way T-type ball valve is connected to the pressure gauge 10, and the two external thread interfaces are respectively connected to a union 4-point fully internal thread adapter for installation on the aerated water pipe 8. In this way, the flow rate and pressure of the aerated water in the aerated water pipe 8 can be accurately adjusted by controlling the switch on the union three-way T-type ball valve.

[0032] Furthermore, the bubble water release device 7 is fixedly installed at the center of the flotation tank 1. The bubble water release device 7 includes three first bubble water release heads. The top of the first bubble water release head is open to allow bubble water to be injected upwards, and the bottom of the first bubble water release head is open to allow bubble water to be injected downwards. This allows for full contact between the biogas residue present above and below the first bubble water release head in the flotation tank 1, improving the rising efficiency of the biogas residue and reducing the solid content. The first bubble water release head is preferably, but not limited to, cylindrical in shape. The middle side of one first bubble water release head is fixedly connected and communicates with the second end face of the bubble water pipe 8. Two first bubble water release heads are symmetrically arranged about the center line of the second end of the bubble water pipe 8. The middle side of the two first bubble water release heads is fixedly connected and communicates with the side of the second end of the bubble water pipe 8. Setting three first bubble water release heads can effectively prevent the biogas residue in the biogas slurry at the bottom of the flotation tank 1 from having its rising path obstructed by the first bubble water release heads.

[0033] Furthermore, a first partition plate 33 is fixedly installed at the bottom of the flotation tank 1, dividing the interior of the flotation tank 1 into a first flotation zone and a second flotation zone. The second flotation zone accommodates the bubble water release device 7. The bubble water pipe 8 has a branch pipe, and a second bubble water release head 34 is fixedly installed on the branch pipe. The top of the second bubble water release head 34 is open to allow bubble water to be filled upwards. The second bubble water release head 34 is placed at the bottom of the first flotation zone. In use, the biogas slurry is first introduced into the first flotation zone for preliminary flotation treatment, and then the biogas slurry in the first flotation zone overflows into the second flotation zone for centralized flotation treatment. A second partition plate is fixedly installed between the water collection tank 2 and the second flotation zone. The second partition plate has several water permeable holes, which allow the water collection tank and the second flotation zone to communicate. A filter screen is fixedly installed on the second partition plate, covering each water permeable hole. The structure is simple and easy to manufacture and use.

[0034] Furthermore, the flotation test device for solid-liquid separation of biogas slurry provided by this utility model also includes a reflux suction head 11 and a reflux pipe 12. The reflux suction head 11 is fixedly installed in the water collection tank 2. One end of the reflux pipe 12 is fixedly connected to and communicates with the reflux suction head 11, and the other end of the reflux pipe 12 is fixedly connected to and communicates with the liquid inlet of the reflux pump 5. The structure is simple and easy to manufacture and use.

[0035] Furthermore, the flotation test device for solid-liquid separation of biogas slurry provided by this utility model also includes a first flocculation reaction tank 13 and a second flocculation reaction tank 14. The first flocculation reaction tank 13 is used to add a first agent, and the second flocculation reaction tank 14 is used to add a second agent. The fluid in the first flocculation reaction tank 13 can overflow into the second flocculation reaction tank 14, and the fluid in the second flocculation reaction tank 14 can overflow into the flotation tank 1. The flocs obtained by combining biogas residue with the first agent and the second agent collide and adhere with microbubbles to form air-carrying flocs that float to the surface of the treated biogas slurry, which can improve the removal efficiency of biogas residue. The first agent is preferably, but not limited to, the coagulant PAC (polyaluminum chloride), and the second agent is preferably, but not limited to, the flocculant PAM (polyacrylamide).

[0036] Furthermore, the flotation test device for solid-liquid separation of biogas slurry provided by this utility model also includes a first agitator 15 and a second agitator 16. The first agitator 15 is installed on the first flocculation reaction tank 13 and can agitate the fluid in the first flocculation reaction tank 13. The second agitator 16 is installed on the second flocculation reaction tank 14 and can agitate the fluid in the second flocculation reaction tank 14. The first agitator 15 and the second agitator 16 have the same structure and can both be conventional agitators, that is, they can both achieve agitation by driving the agitator shaft and the agitator paddle on the agitator shaft with a motor.

[0037] Furthermore, the flotation test device for solid-liquid separation of biogas slurry provided by this utility model also includes an outlet tank 17, an inlet tank 18, an inlet pump 19, and an inlet pipe 20. The outlet tank 17 is located below the collection tank 2 and can receive the deslag-removed biogas slurry discharged from the collection tank 2. The inlet tank 18 is used to store the biogas slurry to be treated. One end of the inlet pipe 20 is fixedly connected to and communicates with the inlet tank 18, and the other end of the inlet pipe 20 is fixedly connected to and communicates with the bottom of the first flocculation reaction tank 13. The bottom of the first flocculation reaction tank 13 is provided with a first dosing port, so that the biogas slurry can immediately contact the first agent when it enters the first flocculation reaction tank 13. The top of the second flocculation reaction tank 14 is provided with a second dosing port, so that the biogas slurry can immediately contact the second agent when it enters the second flocculation reaction tank 14. The structure is simple and easy to manufacture and use.

[0038] Furthermore, the flotation test device for solid-liquid separation of biogas slurry provided by this utility model also includes an electrical control box 21. The electrical control box 21 is equipped with a scraper mechanism start button 25, a scraper mechanism stop button 24, a liquid inlet pump start button 23, a liquid inlet pump stop button 22, a stirrer start button 27, a stirrer stop button 26, a dissolved air start button 29, a dissolved air stop button 28, and a handle 30. The scraper mechanism start button 25 and the scraper mechanism stop button 24 are connected to the scraper mechanism 4. The scraper mechanism start button 25 and the scraper mechanism stop button 24 can control the operation of the scraper mechanism 4. Button 23 and inlet pump off button 22 are connected to inlet pump 19. Inlet pump on button 23 and inlet pump off button 22 can control the operation of inlet pump 19. Stirring on button 27 and stirring off button 26 are connected to first stirrer 15 and second stirrer 16. Stirring on button 27 and stirring off button 26 can control the operation of first stirrer 15 and second stirrer 16. Dissolved gas on button 29 and dissolved gas off button 28 are connected to reflux pump 5 and aerator 6. Dissolved gas on button 29 and dissolved gas off button 28 can control reflux pump 5 and aerator 6, which is convenient for centralized control.

[0039] Furthermore, the flotation test device for solid-liquid separation of biogas slurry provided by this utility model also includes a frame 31 and several wheels 32. The flotation tank 1, water collection tank 2, slag collection tank 3, first flocculation reaction tank 13, second flocculation reaction tank 14, liquid outlet tank 17, liquid inlet tank 18 and electrical control box 21 are all fixed on the frame 31, and each wheel 32 is located at the bottom of the frame 31 for easy relocation.

[0040] As a preferred embodiment of this invention, water taps are provided on the flotation tank 1, the water collection tank 2, the slag collection tank 3, the first flocculation reaction tank 13, the second flocculation reaction tank 14, the liquid outlet tank 17, and the liquid inlet tank 18.

[0041] In a preferred embodiment of this method, biogas slurry is first injected into the inlet tank 18. When the inlet tank 18 is full, the pump start button 23 on the control box 21 is pressed to pump the biogas slurry from the inlet tank 18 into the first flocculation reaction tank 13. Simultaneously, biogas slurry is continuously pumped into the inlet tank 18. After the biogas slurry enters the first flocculation reaction tank 13, the stirring start button 27 is pressed. Polyaluminum chloride (PAC) is added to the first flocculation reaction tank 13, and polyacrylamide (PAM) is added to the second flocculation reaction tank 14. The liquid is thoroughly stirred by the first agitator 15 and the second agitator 16. The biogas slurry rises continuously in the first flocculation reaction tank 13 until it reaches the top of the first flocculation reaction tank 13, and then enters the second flocculation reaction tank 14 through the gaps. The biogas slurry with added flocculant in the second flocculation reaction tank 14 continuously flows into the flotation tank 1. When the biogas slurry in the flotation tank 1 rises to half the height of the tank, the dissolved air start button 29 is pressed. The biogas slurry enters the aerator 6 through the return suction head 11, and then the aerated water passes through the regulating valve 9 and finally through the aerated water release device. 7. The solution is transported to the flotation tank 1. Simultaneously, the scraper mechanism start button 25 is pressed, causing the scraper to begin its track movement. The air bubbles carry the biogas residue, combined with the flocculant, to the surface, causing it to float. When the biogas slurry reaches a certain height, turbid solid matter and large, dense air bubbles can be seen on the surface. Both the turbid solid matter and the large, dense air bubbles are carried by the scraper into the collection tank 3. The faucet connected to the collection tank 3 is then turned on, and an empty bucket is placed under the faucet to collect the discharged impurities. The biogas slurry filtered by the filter screen flows directly into the flotation tank 1. In the water collection tank 2, when the biogas slurry in the water collection tank 2 reaches the height of the faucet above the water collection tank 2, it will flow directly into the liquid outlet tank 17 for collection. After the experiment, first press the liquid inlet pump shut-off button 22, then press the dissolved gas shut-off button 28, and finally press the scraper mechanism shut-off button 24 and the stirring shut-off button 26. To facilitate cleaning after the experiment, a drain outlet is designed at the bottom or side of the liquid inlet tank 18, the first flocculation reaction tank 13, the second flocculation reaction tank 14, the flotation tank 1, the water collection tank 2, and the liquid outlet tank 17 to facilitate the discharge of sewage.

[0042] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A flotation test device for solid-liquid separation of biogas slurry, characterized in that: The system includes a flotation tank, a water collection tank, a sludge collection trough, a sludge scraping mechanism, a reflux pump, an aerator, and an aerator. The flotation tank can hold the biogas slurry to be treated. The water collection tank is connected to the flotation tank, and a filter screen is fixedly installed at the connection between the water collection tank and the flotation tank. The water collection tank can receive the biogas slurry with sludge removed from the flotation tank. The aerator is fixedly installed in the biogas slurry to be treated in the flotation tank and can fill the biogas slurry with aerator. The inlet of the reflux pump is connected to the water collection tank, and the outlet of the reflux pump is connected to the inlet of the aerator. The outlet of the aerator is connected to the aerator. The sludge collection trough is fixedly installed on the top of the inner side wall of the flotation tank. The sludge scraping mechanism is located above the flotation tank and can scrape the biogas sludge on the surface of the biogas slurry to be treated into the sludge collection trough.

2. The air flotation test device for solid-liquid separation of biogas slurry according to claim 1, characterized in that: It also includes a bubble water pipe and a pressure gauge. The first end of the bubble water pipe is fixedly connected to and communicates with the outlet of the bubble machine, and the second end of the bubble water pipe is fixedly connected to and communicates with the bubble water releaser. The bubble water pipe is equipped with a regulating valve, which is located outside the flotation tank. The regulating valve can regulate the flow rate and pressure of the bubble water in the bubble water pipe. The pressure gauge is fixedly installed on the bubble water pipe and is located between the regulating valve and the flotation tank. The pressure gauge can detect the pressure of the bubble water in the bubble water pipe.

3. The air flotation test device for solid-liquid separation of biogas slurry according to claim 2, characterized in that: The bubble water release device is fixedly installed at the center of the flotation tank. The bubble water release device includes three first bubble water release heads. The top of the first bubble water release head is open to allow bubble water to be filled upwards, and the bottom of the first bubble water release head is open to allow bubble water to be filled downwards. The middle of the side of one of the first bubble water release heads is fixedly connected and communicates with the second end face of the bubble water pipe. Two first bubble water release heads are symmetrically arranged about the center line of the second end of the bubble water pipe, and the middle of the side of the two first bubble water release heads is fixedly connected and communicates with the side of the second end of the bubble water pipe.

4. The air flotation test device for solid-liquid separation of biogas slurry according to claim 2, characterized in that: A first partition plate is fixedly installed at the bottom of the flotation tank, dividing the interior of the flotation tank into a first flotation zone and a second flotation zone. The second flotation zone accommodates the bubble water release device. The bubble water pipe has a branch pipe, and a second bubble water release head is fixedly installed on the branch pipe. The top of the second bubble water release head is open to allow bubble water to be filled upwards. The second bubble water release head is located at the bottom of the first flotation zone. A second partition plate is fixedly installed between the water collection tank and the second flotation zone. The second partition plate has several water permeable holes, which allow the water collection tank to communicate with the second flotation zone. A filter screen is fixedly installed on the second partition plate, covering each of the water permeable holes.

5. The air flotation test device for solid-liquid separation of biogas slurry according to claim 1, characterized in that: It also includes a return suction head and a return pipe. The return suction head is fixedly installed in the water collection tank. One end of the return pipe is fixedly connected to and communicates with the return suction head, and the other end of the return pipe is fixedly connected to and communicates with the inlet of the return pump.

6. The air flotation test device for solid-liquid separation of biogas slurry according to claim 1, characterized in that: It also includes a first flocculation reaction tank and a second flocculation reaction tank. The first flocculation reaction tank is used to add a first agent, and the second flocculation reaction tank is used to add a second agent. The fluid in the first flocculation reaction tank can overflow into the second flocculation reaction tank, and the fluid in the second flocculation reaction tank can overflow into the flotation tank.

7. The air flotation test device for solid-liquid separation of biogas slurry according to claim 6, characterized in that: It also includes a first agitator and a second agitator. The first agitator is disposed on the first flocculation reaction tank and can agitate the fluid in the first flocculation reaction tank. The second agitator is disposed on the second flocculation reaction tank and can agitate the fluid in the second flocculation reaction tank.

8. The air flotation test device for solid-liquid separation of biogas slurry according to claim 7, characterized in that: It also includes an outlet tank, an inlet tank, an inlet pump, and an inlet pipe. The outlet tank is located below the collection tank and can receive the sludge-removed biogas slurry discharged from the collection tank. The inlet tank is used to store the biogas slurry to be treated. One end of the inlet pipe is fixedly connected to and communicates with the inlet tank, and the other end of the inlet pipe is fixedly connected to and communicates with the bottom of the first flocculation reaction tank. The bottom of the first flocculation reaction tank is provided with a first dosing port, and the top of the second flocculation reaction tank is provided with a second dosing port.

9. The air flotation test device for solid-liquid separation of biogas slurry according to claim 8, characterized in that: It also includes an electrical control box, which is equipped with a slag scraping mechanism start button, a slag scraping mechanism stop button, a liquid inlet pump start button, a liquid inlet pump stop button, a stirring start button, a stirring stop button, a dissolved gas start button, a dissolved gas stop button, and a handle. The slag scraping mechanism start button and the slag scraping mechanism stop button are connected to the slag scraping mechanism and can control the operation of the slag scraping mechanism. The liquid inlet pump start button and the liquid inlet pump stop button are connected to the liquid inlet pump and can control the operation of the liquid inlet pump. The stirring start button and the stirring stop button are connected to the first stirrer and the second stirrer and can control the operation of the first stirrer and the second stirrer. The dissolved gas start button and the dissolved gas stop button are connected to the reflux pump and the bubble machine and can control the operation of the reflux pump and the bubble machine.

10. The air flotation test device for solid-liquid separation of biogas slurry according to claim 9, characterized in that: It also includes a frame and several wheels. The flotation tank, the water collection tank, the sludge collection tank, the first flocculation reaction tank, the second flocculation reaction tank, the liquid outlet tank, the liquid inlet tank and the electrical control box are all fixed on the frame, and each of the wheels is located at the bottom of the frame.

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