A centrifugal filtration integrated laboratory waste liquid purification device

Abstract

The present invention discloses a centrifugal filtration integrated laboratory waste liquid purification device, which relates to the field of laboratory waste liquid treatment. A centrifugal filtration integrated laboratory waste liquid purification device includes a waste liquid treatment tank, and also includes: a centrifugal filter barrel, which is rotatably arranged on the upper side of the interior of the waste liquid treatment tank; a fixed frame, which is installed inside the waste liquid treatment tank and located on the lower side of the centrifugal filter barrel; and an ultrafiltration membrane, which is fixedly connected to the fixed frame. The present invention can not only efficiently separate larger particle impurities from the waste liquid, but also lift some small particle impurities to the liquid surface and separate them from the waste liquid, further reducing the content of impurity particles in the waste liquid flowing out of the centrifugal filter barrel, so that the load of subsequent ultrafiltration membrane treatment is greatly reduced, thereby improving the separation efficiency of the entire device for solid impurities in the waste liquid. Since the gas jet-assisted separation effectively reduces the amount of impurity particles entering the ultrafiltration membrane, the clogging risk and filtration pressure of the ultrafiltration membrane are reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of laboratory waste liquid treatment, and in particular relates to a centrifugal filtration integrated laboratory waste liquid purification device. Background Art

[0002] In various laboratories, a large amount of waste liquid is generated during the experimental process. The composition of these waste liquids is complex, including various chemical reagents, organic solvents, heavy metal ions, biological pollutants, solid particles, etc. If they are discharged directly without treatment, they will cause serious pollution to the environment and endanger the ecosystem and human health.

[0003] At present, there are various methods for treating laboratory waste liquid, but most of them have some shortcomings. For example, when filtering waste liquid, traditional filtration methods mostly rely on simple filtration devices such as filter screens, which have poor interception effects on tiny particles and colloidal substances, are prone to clogging, and require frequent replacement of filter media, increasing treatment costs and workload. Although simple centrifugal separation equipment can separate larger particle impurities to a certain extent, it has limited ability to remove small particle impurities and soluble pollutants. In addition, during the centrifugation process, solid impurities are easily attached to the inner wall of the centrifuge barrel, causing the filter pores to be clogged, affecting the separation efficiency and the continuous operation of the equipment.

[0004] At the same time, some laboratory waste liquid treatment devices have unreasonable structural design and poor connection between the various treatment units, which causes the waste liquid to stay too long during the treatment process and has low treatment efficiency. For example, the transmission of waste liquid between different treatment units requires manual intervention or a complex piping system, which increases the complexity and time cost of operation, and also takes up a large amount of laboratory space, increases the purchase cost of equipment and the difficulty of maintenance. In view of this, the present invention is specially proposed. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a centrifugal filtration integrated laboratory waste liquid purification device that can overcome the above problems or at least partially solve the above problems.

[0006] To solve the above technical problems, the basic concept of the technical solution adopted by the present invention is: a centrifugal filtration integrated laboratory waste liquid purification device, including a waste liquid treatment tank, and also including: a centrifugal filter barrel, which is rotatably arranged on the upper side of the interior of the waste liquid treatment tank; a fixed frame, which is installed in the interior of the waste liquid treatment tank and located on the lower side of the centrifugal filter barrel; an ultrafiltration membrane, which is fixedly connected to the fixed frame; an activated carbon adsorption plate, which is installed in the interior of the waste liquid treatment tank and located on the lower side of the fixed frame; an annular air supply pipe, which is fixedly installed in the interior of the waste liquid treatment tank through a support plate and is located above the centrifugal filter barrel; an air jet pipe, which is equidistantly distributed in a circle inside the centrifugal filter barrel, the upper end of the air jet pipe is connected to the annular air supply pipe, and the air jet pipe is equidistantly provided with a plurality of one-way nozzles facing the inner wall of the centrifugal filter barrel; an infusion pipe with a first one-way valve inside, which is fixedly installed at the upper end of the waste liquid treatment tank, the liquid outlet of the infusion pipe faces downward into the centrifugal filter barrel, and a drain pipe is connected to the lower end of one side of the waste liquid treatment tank.

[0007] In order to facilitate the cleaning of the separated and filtered waste residue and the replacement of the activated carbon adsorption plate, a residue suction pipe is fixedly installed on one side of the upper end of the waste liquid treatment tank, and the lower end of the residue suction pipe extends downward into the centrifugal filter barrel and is located on the upper side of the uppermost filter hole of the centrifugal filter barrel. A first solenoid valve is installed in the residue suction pipe, and annular protrusions are provided near the fixed frame and the activated carbon adsorption plate in the waste liquid treatment tank. The fixed frame and the activated carbon adsorption plate are respectively located on adjacent annular protrusions. A taking and releasing port is opened in the waste liquid treatment tank close to the annular protrusion. The two taking and releasing ports of the waste liquid treatment tank are respectively sealed and plugged with arc-shaped sealing plates connected to the fixed frame and the activated carbon adsorption plate, and a handle is fixedly connected to the outer wall of the arc-shaped sealing plate.

[0008] In order to ensure the overall strength of the waste liquid treatment tank, further, the two taking and putting ports on the waste liquid treatment tank are staggered.

[0009] Furthermore, it also includes a drive motor, which is fixedly connected to the center of the upper end of the waste liquid treatment tank. The output end of the drive motor is fixedly connected to a drive shaft, and the lower end of the drive shaft extends downward into the centrifugal filter barrel and is fixedly connected to the centrifugal filter barrel.

[0010] In order to improve the dredging effect on the filter holes of the centrifugal filter barrel, further, the one-way nozzle on the air injection pipe is inclined to face the inner wall of the centrifugal filter barrel.

[0011] In order to ensure the smooth rotation of the centrifugal filter barrel, a plurality of mounting seats are further arranged at equal intervals on the circumference inside the waste liquid treatment tank, and the mounting seats are rotatably connected to limit rollers, and the limit rollers are rollingly connected to the outer wall of the centrifugal filter barrel.

[0012] In order to facilitate the supply of air to the annular air supply pipe, further, a plurality of air cylinders are fixedly connected to the waste liquid treatment tank at equal intervals in a circle, a piston rod with a piston is slidably connected in the air cylinder, a tensioning spring is provided in the air cylinder, and the two ends of the tensioning spring are respectively fixedly connected to the air cylinder and the piston on the piston rod, a second one-way valve is provided in the air inlet and outlet of the air cylinder, and the air outlet of the air cylinder is connected to the annular air supply pipe through an air supply pipe.

[0013] In order to facilitate the control of the reciprocating movement of the piston rod in the air cylinder, further, one end of the multiple piston rods extending out of the air cylinder is fixedly connected to the adjacent mounting seats, and the limiting roller is an eccentric wheel.

[0014] In order to increase the friction between the limiting roller and the centrifugal filter barrel, further, the surfaces of the limiting roller and the centrifugal filter barrel that are in contact with each other are both provided with an anti-slip layer.

[0015] In order to ensure that the air pressure in the waste liquid treatment tank can be maintained within an appropriate range and to dredge the ultrafiltration membrane, the waste liquid treatment tank is further connected to a back-blowing air pipe located above the ultrafiltration membrane. The air outlet end of the back-blowing air pipe extends into the waste liquid treatment tank and is located between the ultrafiltration membrane and the activated carbon adsorption plate. The air outlet of the back-blowing air pipe faces upward towards the ultrafiltration membrane. A second solenoid valve is installed in the back-blowing air pipe. An air pressure monitoring gauge is installed on the waste liquid treatment tank. The air pressure monitoring gauge is located above the ultrafiltration membrane, and the monitoring head of the air pressure monitoring gauge is located in the waste liquid treatment tank.

[0016] After adopting the above technical scheme, the present invention has the following beneficial effects compared with the prior art: the present invention can not only efficiently separate larger particle impurities from the waste liquid through the synergistic effect of centrifugal force and gas injection, but also the bubbles generated by the gas can lift some small particle impurities to the liquid surface and separate them from the waste liquid, further reducing the content of impurity particles in the waste liquid flowing out of the centrifugal filter barrel, so that the load of subsequent ultrafiltration membrane treatment is greatly reduced, thereby improving the separation efficiency of the entire device for solid impurities in the waste liquid. Since the gas injection-assisted separation effectively reduces the amount of impurity particles entering the ultrafiltration membrane, the clogging risk and filtration pressure of the ultrafiltration membrane are reduced, so that the ultrafiltration membrane can work in a relatively clean environment, thereby significantly increasing the service life of the ultrafiltration membrane, reducing the replacement frequency of the ultrafiltration membrane, and reducing the use cost.

[0017] After multiple purification steps such as centrifugal separation, ultrafiltration membrane filtration and activated carbon adsorption, the device can effectively remove pollutants such as solid particles, colloids, large molecular organic matter and odor in the waste liquid, so that the waste liquid can be purified more thoroughly. The quality of the purified waste liquid can meet the relevant standards and requirements for laboratory waste liquid discharge, which is beneficial to environmental protection and safe operation of the laboratory.

[0018] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In the attached figure:

[0020] Figure 1 It is a structural schematic diagram of the present invention;

[0021] Figure 2 Schematic diagram of the internal structure of the waste liquid treatment tank of the present invention Figure 1 ;

[0022] Figure 3 Schematic diagram of the internal structure of the waste liquid treatment tank of the present invention Figure 2 ;

[0023] Figure 4 It is a schematic cross-sectional view of the present invention;

[0024] Figure 5 It is a structural schematic diagram of part of the structure of the present invention;

[0025] Figure 6 It is a schematic structural diagram of the interior of the centrifugal filter barrel of the present invention.

[0026] In the figure: 1. Waste liquid treatment tank; 101. Liquid infusion pipe; 102. Liquid discharge pipe; 103. Slag suction pipe; 104. Annular protrusion; 106. Air pressure monitoring gauge; 107. Back-blowing air pipe; 108. Second solenoid valve; 2. Drive motor; 201. Drive shaft; 202. Centrifugal filter barrel; 3. Fixed frame; 301. Ultrafiltration membrane; 4. Activated carbon adsorption plate; 5. Arc sealing plate; 6. Annular air supply pipe; 601. Jet pipe; 602. One-way nozzle; 7. Air cylinder; 701. Tension spring; 702. Piston rod; 703. Mounting seat; 704. Limit roller; 705. Gas pipe. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0028] Example 1: Reference Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 6, a centrifugal filtration integrated laboratory waste liquid purification device, including a waste liquid treatment tank 1, and also includes: a centrifugal filter barrel 202, which is rotatably arranged on the upper side of the interior of the waste liquid treatment tank 1; a fixed frame 3, which is installed in the interior of the waste liquid treatment tank 1 and is located on the lower side of the centrifugal filter barrel 202; an ultrafiltration membrane 301, which is fixedly connected to the fixed frame 3; an activated carbon adsorption plate 4, which is installed in the interior of the waste liquid treatment tank 1 and is located on the lower side of the fixed frame 3; an annular air supply pipe 6, which is fixedly installed in the interior of the waste liquid treatment tank 1 through a support plate and is located Above the centrifugal filter barrel 202; the air jet pipes 601 are equidistantly distributed in a circle inside the centrifugal filter barrel 202, the upper end of the air jet pipe 601 is connected to the annular air supply pipe 6, and the air jet pipe 601 is equidistantly provided with a plurality of one-way nozzles 602 facing the inner wall of the centrifugal filter barrel 202; the infusion pipe 101 with a first one-way valve inside is fixedly installed at the upper end of the waste liquid treatment tank 1, the liquid outlet of the infusion pipe 101 faces downward into the centrifugal filter barrel 202, and the lower end of one side of the waste liquid treatment tank 1 is connected to the drain pipe 102.

[0029] It also includes a drive motor 2, which is fixedly connected to the center of the upper end of the waste liquid treatment tank 1. The output end of the drive motor 2 is fixedly connected to a drive shaft 201. The lower end of the drive shaft 201 extends downward into the centrifugal filter barrel 202 and is fixedly connected to the centrifugal filter barrel 202.

[0030] In the process of laboratory experiments, it is inevitable to produce some waste liquid. Since the waste liquid contains a large amount of particulate impurities and harmful substances, in order to ensure that the waste liquid meets the discharge standards, it is necessary to perform corresponding purification treatment on the waste liquid. When the laboratory waste liquid needs to be purified, the laboratory waste liquid can be continuously transported to the centrifugal filter barrel 202 through the infusion tube 101 with a first one-way valve inside. By controlling the flow rate of the waste liquid, the liquid level is always higher than the uppermost filter hole of the centrifugal filter barrel 202. When the waste liquid is transported, the drive motor 2 can be started, and the drive motor 2 will drive the drive shaft 201 to rotate, thereby rotating the centrifugal filter barrel 202. Under the centrifugal force (F 离心 =mω 2 Under the action of the centrifugal filter (where r, m is the particle mass, ω is the rotational angular velocity, and r is the particle rotation radius), the larger particle impurities in the waste liquid will be thrown toward the inner wall of the centrifugal filter barrel 202.

[0031] When the waste liquid is centrifuged to separate the larger particles of impurities through the centrifugal filter barrel 202, gas can be delivered to the annular gas supply pipe 6 (the gas pressure is preferably 0.15-0.25MPa, and the flow rate is preferably 2-4m 3 / h), the distance between the air jet pipe 601 and the inner wall of the centrifugal filter barrel 202 is designed to be 10-15mm. This distance ensures that the gas jet covers the inner wall of the filter barrel and prevents the air jet pipe from being excessively disturbed by the centrifugal flow field. The gas enters the air jet pipe 601 through the annular air supply pipe 6 and is ejected from the one-way nozzle 602. In the rotating flow field, the movement of the bubble meets the principle of fluid mechanics: the bubble is affected by the buoyancy (F 浮 =P 液 gV 泡 ), centrifugal force and drag force (F 曳 =0.5C dρ液 A(υ 液 -v 泡 ) 2 , C d is the drag coefficient, A is the cross-sectional area of the bubble), theoretical derivation and experimental verification show that when the gas pressure is 0.2 MPa and the distance between the jet pipes is 12 mm, the bubbles can obtain a sufficient rising speed in the flow field (calculated to be 0.6-0.8 m / s), overcome the influence of centrifugal force and rise. Part of the ejected gas moves to the inner wall of the centrifugal filter barrel 202 in the form of bubbles following the water flow, while the other part moves upward rapidly to form upward-floating bubbles because the gas density is lower than that of the liquid.

[0032] When the bubbles come into contact with the inner wall of the centrifugal filter barrel 202, the cavitation effect principle is used: the bubbles burst and micro jets are generated (the speed can reach 80-120m / s), and the impact force of the micro jets (F 冲 =ΔP·S, where ΔP is the bubble burst pressure difference and S is the effective area) is greater than the adhesion force between impurity particles and the inner wall (calculated, for common laboratory waste liquid impurities, the bubble burst impact force is approximately 1.2-1.5 times the adhesion force), thereby effectively loosening impurity particles attached to the inner wall of centrifugal filter barrel 202 and ensuring smooth passage of liquid through the filter pores. The upward-floating bubbles lift impurity particles through buoyancy, causing them to leave the filter pores and float above the waste liquid surface. At the same time, impurities that continue to move toward the inner wall of centrifugal filter barrel 202 under the action of centrifugal force will change their trajectory when intercepted by the bubbles, floating upward to avoid contact with the filter pores, effectively preventing clogging of centrifugal filter barrel 202.

[0033] After the waste liquid has been initially separated by the centrifugal filter barrel 202, it will flow through the filter holes into the fixed frame 3 below, to which an ultrafiltration membrane 301 is fixedly connected. When the waste liquid flows through the ultrafiltration membrane 301, the ultrafiltration membrane 301 uses its microporous structure to further filter the waste liquid, intercepting smaller particles of impurities and macromolecular substances, so that the filtrate is further purified.

[0034] At the same time, when the gas leaves the centrifugal filter barrel 202, it will gather in the cavity above the ultrafiltration membrane 301 in the waste liquid treatment tank 1, increasing its pressure. The cavity below the ultrafiltration membrane 301 in the waste liquid treatment tank 1 is connected to the outside world, so the air pressure on the ultrafiltration membrane 301 will be greater than the air pressure below. Then, when the waste liquid passes through the ultrafiltration membrane 301, it will quickly pass through the ultrafiltration membrane 301 under the action of the pressure difference, thereby improving the filtration efficiency of the waste liquid.

[0035] The waste liquid filtered by the ultrafiltration membrane 301 continues to flow downward and reaches the activated carbon adsorption plate 4 installed inside the waste liquid treatment tank 1 and located on the lower side of the fixed frame 3. The activated carbon adsorption plate 4 uses the adsorption characteristics of activated carbon to adsorb residual organic pollutants, odors, etc. in the waste liquid, thereby further improving the purification degree of the waste liquid.

[0036] The purified waste liquid after the above series of treatments is finally discharged through the drain pipe 102 connected to the lower end of one side of the waste liquid treatment tank 1.

[0037] Through the synergistic effect of centrifugal force and gas injection, not only can larger particle impurities be efficiently separated from the waste liquid, but the bubbles generated by the gas can also lift some small particle impurities to the liquid surface and separate them from the waste liquid, further reducing the content of impurity particles in the waste liquid flowing out of the centrifugal filter barrel 202, so that the load of subsequent ultrafiltration membrane 301 processing is greatly reduced, thereby improving the separation efficiency of the entire device for solid impurities in the waste liquid. Since the gas injection-assisted separation effectively reduces the amount of impurity particles entering the ultrafiltration membrane 301, the clogging risk and filtration pressure of the ultrafiltration membrane 301 are reduced, so that the ultrafiltration membrane 301 can work in a relatively clean environment, thereby significantly increasing the service life of the ultrafiltration membrane 301, reducing the replacement frequency of the ultrafiltration membrane 301, and reducing the cost of use.

[0038] After multiple purification steps such as centrifugal separation, ultrafiltration membrane 301 filtration and activated carbon adsorption, the device can effectively remove pollutants such as solid particles, colloids, large molecular organic matter and odor in the waste liquid, so that the waste liquid can be purified more thoroughly. The quality of the purified waste liquid can meet the relevant standards and requirements for laboratory waste liquid discharge, which is beneficial to environmental protection and safe operation of the laboratory.

[0039] Example 2: Reference Figures 1-4, a centrifugal filtration integrated laboratory waste liquid purification device is basically the same as Example 1, and further, a residue suction pipe 103 is fixedly installed on one side of the upper end of the waste liquid treatment tank 1, and the lower end of the residue suction pipe 103 extends downward into the centrifugal filter barrel 202, and is located on the upper side of the uppermost filter hole of the centrifugal filter barrel 202, and a first solenoid valve is installed in the residue suction pipe 103, and an annular protrusion 104 is provided near the fixed frame 3 and the activated carbon adsorption plate 4 in the waste liquid treatment tank 1. The fixed frame 3 and the activated carbon adsorption plate 4 are respectively located on adjacent annular protrusions 104, and the waste liquid treatment tank 1 is provided with a take-in and put-out port at a position close to the annular protrusion 104, and the two take-in and put-out ports of the waste liquid treatment tank 1 are respectively sealed and plugged with a connection with the fixed frame 3 and the activated carbon adsorption plate 4. There is an arc-shaped sealing plate 5, and a handle is fixedly connected to the outer wall of the arc-shaped sealing plate 5. When the impurities separated in the centrifugal filter barrel 202 float on the surface of the waste liquid under the support of the bubbles, the suction pump connected to the slag suction pipe 103 can be started, and the first solenoid valve in the slag suction pipe 103 can be opened, and then the slag suction pipe 103 will extract the impurities floating on the surface of the waste liquid, thereby removing the impurities separated in the centrifugal filter barrel 202. When it is necessary to clean the ultrafiltration membrane 301 and replace the activated carbon adsorption plate 4, the machine can be stopped at this time, and then the fixed frame 3 or the activated carbon adsorption plate 4 can be taken out through the arc-shaped sealing plate 5 by holding the handle, so that the impurities on the ultrafiltration membrane 301 can be cleaned or the activated carbon adsorption plate 4 can be replaced.

[0040] The two taking and releasing ports on the waste liquid treatment tank 1 are staggered. By staggering the two taking and releasing ports, compared with setting the two taking and releasing ports on the same side, the overall strength of the waste liquid treatment tank 1 can be effectively guaranteed, and the problem of deformation of the tank body due to the heavier top of the waste liquid treatment tank 1 when the fixing frame 3 and the activated carbon adsorption plate 4 are taken out from the waste liquid treatment tank 1 is avoided, thereby effectively ensuring the service life of the device.

[0041] Example 3: Reference Figure 6 , a centrifugal filtration integrated laboratory waste liquid purification device, which is basically the same as Example 2, furthermore, the one-way nozzle 602 on the air injection pipe 601 is inclined to face the inner wall of the centrifugal filter barrel 202.

[0042] When the one-way nozzle 602 on the air injection pipe 601 is tilted to face the inner wall of the centrifugal filter barrel 202, the gas ejected from the one-way nozzle 602 (such as air or other gas that helps separation) will form a tangential airflow along the barrel wall of the centrifugal filter barrel 202. This airflow is in the same direction as the centrifugal force, which can enhance the driving effect on the solid particles. Since the solid particles in the waste liquid are easily accumulated on the inner wall of the centrifugal filter barrel 202 under the action of centrifugal force, the gas ejected from the tilted one-way nozzle 602 can blow away the accumulated solid particles. The flow of gas can disrupt the accumulation structure of the solid particles, preventing them from tightly adhering to the barrel wall to form hard lumps or clogging the filter holes, thereby ensuring the continuous and stable progress of the centrifugal filtration process and avoiding the problems of poor liquid circulation and reduced filtration efficiency due to clogging of the inner wall.

[0043] At the same time, taking chemical waste liquid containing multiple components as an example, there may be a mixture of liquids and solids with different densities. The liquid circulation caused by the gas ejected from the inclined one-way nozzle 602 can better mix the components, ensuring that the various components can be effectively separated under the action of centrifugal force, which is beneficial to the subsequent filtration and purification process and improves the purification quality of the waste liquid by the entire device.

[0044] Example 4: Reference Figure 1 、 Figure 2 、 Figure 4 、 Figure 5 , a centrifugal filtration integrated laboratory waste liquid purification device is basically the same as Example 3. Furthermore, a plurality of mounting seats 703 are equidistantly arranged on the circumference of the waste liquid treatment tank 1. The mounting seats 703 are rotatably connected to the limiting rollers 704. The limiting rollers 704 are rollingly connected to the outer wall of the centrifugal filter barrel 202. Through the setting of the limiting rollers 704, the centrifugal filter barrel 202 can be supported and limited, thereby ensuring that the centrifugal filter barrel 202 can rotate in a stable state, thereby improving the stability of the rotation of the centrifugal filter barrel 202.

[0045] A plurality of gas cylinders 7 are fixedly connected to the waste liquid treatment tank 1 at equal intervals in a circle. A piston rod 702 with a piston is slidably connected inside the gas cylinder 7. A tensioning spring 701 is provided in the gas cylinder 7. The two ends of the tensioning spring 701 are respectively fixedly connected to the gas cylinder 7 and the piston on the piston rod 702. A second one-way valve is provided in the gas inlet and outlet of the gas cylinder 7. The gas outlet of the gas cylinder 7 is connected to the annular gas supply pipe 6 through an air supply pipe 705.

[0046] One end of the plurality of piston rods 702 extending out of the air cylinder 7 is fixedly connected to the adjacent mounting seats 703 respectively, and the limiting roller 704 is an eccentric wheel.

[0047] The side of the limiting roller 704 that contacts the centrifugal filter barrel 202 is provided with an anti-skid layer. The provision of the anti-skid layer can increase the friction between the limiting roller 704 and the centrifugal filter barrel 202, so that the centrifugal filter barrel 202 can drive the limiting roller 704 to rotate more smoothly.

[0048] When the driving motor 2 drives the centrifugal filter barrel 202 to rotate through the driving shaft 201, the limiting roller 704 is tightly against the centrifugal filter barrel 202 under the elastic force of the tensioning spring 701, so the limiting roller 704 will rotate with the centrifugal filter barrel 202, and since the limiting roller 704 is an eccentric wheel, when the limiting roller 704 rotates, it can drive the piston rod 702 to move back and forth in the air cylinder 7 with the cooperation of the tensioning spring 701, and then the air cylinder 7 will transport gas to the annular air supply pipe 6 through the air supply pipe 705, so that the one-way nozzle 602 can spray gas into the centrifugal filter barrel 202.

[0049] Example 5: Reference Figures 1-4 , a centrifugal filtration integrated laboratory waste liquid purification device, which is basically the same as Example 4, furthermore, the waste liquid treatment tank 1 is located above the ultrafiltration membrane 301 and is connected to a backflush air pipe 107, the outlet end of the backflush air pipe 107 extends into the waste liquid treatment tank 1 and is located between the ultrafiltration membrane 301 and the activated carbon adsorption plate 4, the air outlet of the backflush air pipe 107 faces upward toward the ultrafiltration membrane 301, and a second solenoid valve 108 is installed in the backflush air pipe 107, and an air pressure monitoring gauge 106 is installed on the waste liquid treatment tank 1, the air pressure monitoring gauge 106 is located above the ultrafiltration membrane 301, and the monitoring head of the air pressure monitoring gauge 106 is located in the waste liquid treatment tank 1.

[0050] When the device is actually used to purify laboratory waste liquid, the air pressure monitoring meter 106 and the second solenoid valve 108 can be electrically connected to the external main controller. When the main controller detects through the air pressure monitoring meter 106 that the air pressure inside the waste liquid treatment tank 1 above the ultrafiltration membrane 301 exceeds the fixed air pressure value, the main controller can control the second solenoid valve 108 in the back-blowing air pipe 107 to open. Since the interior of the waste liquid treatment tank 1 is located below the ultrafiltration membrane 301 and is connected to the outside world through the drain pipe 102, the air pressure below the ultrafiltration membrane 301 is less than the air pressure above the ultrafiltration membrane 301. At this time, the gas with a higher pressure value above the ultrafiltration membrane 301 inside the waste liquid treatment tank 1 will enter the back-blowing air pipe 107, and then the gas with a higher pressure value will be discharged from the bottom of the ultrafiltration membrane 301 to the ultrafiltration membrane 301. The membrane 301 sprays gas. Since the solenoid valve moves very quickly and the electromagnetic force is generated instantaneously, once the power is turned on or off, the valve core can move to the corresponding position in a very short time to realize the rapid opening and closing of the valve. Therefore, the second solenoid valve 108 can be controlled by the main controller to be opened and closed intermittently, and then the ultrafiltration membrane 301 will be shaken under the action of the intermittently sprayed gas, so that the finer impurities on the ultrafiltration membrane 301 can be shaken outward to ensure that the gas and liquid can pass through the ultrafiltration membrane 301 smoothly, which can not only increase the cleaning cycle of the ultrafiltration membrane 301, but also reduce the air pressure in the waste liquid treatment tank 1 to ensure that the air pressure in the waste liquid treatment tank 1 can be maintained within a suitable range, thereby avoiding the problem of damage to the ultrafiltration membrane 301 due to the high air pressure.

[0051] The above description is merely a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as above with the preferred embodiment, it is not intended to limit the present invention.

Claims

1. A centrifugal filtration integrated laboratory waste liquid purification device, characterized in that: It includes a waste liquid treatment tank (1), and also includes: A centrifugal filter barrel (202) is rotatably arranged on the upper side of the interior of the waste liquid treatment tank (1); A fixing frame (3) is installed inside the waste liquid treatment tank (1) and is located on the lower side of the centrifugal filter barrel (202); An ultrafiltration membrane (301) is fixedly connected in the fixing frame (3); An activated carbon adsorption plate (4) is installed inside the waste liquid treatment tank (1) and is located on the lower side of the fixing frame (3); An annular air supply pipe (6) is fixedly mounted inside the waste liquid treatment tank (1) via a support plate and is located above the centrifugal filter barrel (202); The air jet pipes (601) are circumferentially and equidistantly distributed inside the centrifugal filter barrel (202), the upper ends of the air jet pipes (601) are connected to the annular air supply pipe (6), and the air jet pipes (601) are equidistantly provided with a plurality of one-way nozzles (602) facing the inner wall of the centrifugal filter barrel (202); A liquid infusion tube (101) having a first one-way valve disposed therein is fixedly mounted on the upper end of the waste liquid treatment tank (1), the liquid outlet of the liquid infusion tube (101) facing downward into the centrifugal filter barrel (202), and a liquid discharge tube (102) is connected to the lower end of one side of the waste liquid treatment tank (1); A slag suction pipe (103) is fixedly installed on one side of the upper end of the waste liquid treatment tank (1), the lower end of the slag suction pipe (103) extends downward into the centrifugal filter barrel (202) and is located above the uppermost filter hole of the centrifugal filter barrel (202), and a first solenoid valve is installed in the slag suction pipe (103); A plurality of mounting seats (703) are equidistantly arranged on a circumference inside the waste liquid treatment tank (1); a limiting roller (704) is rotatably connected to the mounting seat (703); and the limiting roller (704) is rollingly connected to the outer wall of the centrifugal filter barrel (202); A plurality of gas cylinders (7) are fixedly connected to the waste liquid treatment tank (1) at equal intervals in a circumference, a piston rod (702) with a piston is slidably connected in the gas cylinder (7), a tensioning spring (701) is provided in the gas cylinder (7), and both ends of the tensioning spring (701) are fixedly connected to the gas cylinder (7) and the piston on the piston rod (702), respectively, a second one-way valve is provided in the gas inlet and outlet of the gas cylinder (7), and the gas outlet of the gas cylinder (7) is connected to the annular gas supply pipe (6) via a gas transmission pipe (705); One end of each of the plurality of piston rods (702) extending out of the air cylinder (7) is fixedly connected to an adjacent mounting seat (703), and the limiting roller (704) is an eccentric wheel; The waste liquid treatment tank (1) is located above the ultrafiltration membrane (301) and is connected to a back-blowing air pipe (107). The air outlet end of the back-blowing air pipe (107) extends into the waste liquid treatment tank (1) and is located between the ultrafiltration membrane (301) and the activated carbon adsorption plate (4). The air outlet of the back-blowing air pipe (107) faces upward toward the ultrafiltration membrane (301). A second solenoid valve (108) is installed in the back-blowing air pipe (107). An air pressure monitoring gauge (106) is installed on the waste liquid treatment tank (1). The air pressure monitoring gauge (106) is located above the ultrafiltration membrane (301). The monitoring head of the air pressure monitoring gauge (106) is located in the waste liquid treatment tank (1).

2. A centrifugal filtration integrated laboratory waste liquid purification device according to claim 1, characterized in that: Annular protrusions (104) are provided in the waste liquid treatment tank (1) at positions near the fixed frame (3) and the activated carbon adsorption plate (4); the fixed frame (3) and the activated carbon adsorption plate (4) are respectively located on adjacent annular protrusions (104); a take-in and put-out opening is provided in the waste liquid treatment tank (1) at positions near the annular protrusions (104); arc-shaped sealing plates (5) connected to the fixed frame (3) and the activated carbon adsorption plate (4) are respectively sealed and plugged at the two take-in and put-out openings of the waste liquid treatment tank (1); a handle is fixedly connected to the outer wall of the arc-shaped sealing plate (5).

3. A centrifugal filtration integrated laboratory waste liquid purification device according to claim 2, characterized in that: The two taking and putting openings on the waste liquid treatment tank (1) are staggered.

4. The centrifugal filtration integrated laboratory waste liquid purification device according to claim 1, characterized in that: It also includes a drive motor (2), the drive motor (2) being fixedly connected to the center of the upper end of the waste liquid treatment tank (1), the output end of the drive motor (2) being fixedly connected to a drive shaft (201), the lower end of the drive shaft (201) extending downward into the centrifugal filter barrel (202) and being fixedly connected to the centrifugal filter barrel (202).

5. The centrifugal filtration integrated laboratory waste liquid purification device according to claim 1, characterized in that: The one-way nozzle (602) on the air injection pipe (601) is inclined toward the inner wall of the centrifugal filter barrel (202).

6. The centrifugal filtration integrated laboratory waste liquid purification device according to claim 1, characterized in that: The contacting surfaces of the limiting roller (704) and the centrifugal filter barrel (202) are both provided with an anti-slip layer.

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