A new pollutant wastewater biological-intermittent electrolysis treatment device and method

Abstract

The present invention provides a device and method for biological-intermittent electrolysis treatment of wastewater containing new pollutants. The device and method include a biological pool and an electrolytic pool. The top of the biological pool is connected to the top of the electrolytic pool through a water outlet device, and a water inlet pipe is provided at the bottom of the biological pool. The electrolytic pool is provided with an adsorption layer, a first supporting layer and a water outlet layer from top to bottom, and the water outlet layer is provided with a water outlet pipe. The adsorption layer is provided with at least two electrode plates arranged opposite to each other, and the electrode plates are connected to a power supply. The device and method for biological-intermittent electrolysis treatment of wastewater containing new pollutants provided by the present invention can effectively remove new pollutants in wastewater.

Description

Technical Field

[0001] The present invention belongs to the technical field of water pollution control, and in particular, relates to a device and method for biological-intermittent electrolysis treatment of wastewater containing new pollutants. Background Art

[0002] With the advancement of new pollutant control and management, many new pollutants with low concentrations and difficult biological degradation have entered the management targets of managers, such as antibiotics, PFAS (per- and polyfluoroalkyl substances) and other compounds. At present, the conventional single activated sludge method cannot degrade such new pollutants, and cannot achieve standard treatment and discharge. New pollutants discharged into the environment have long-term enrichment toxicity or endocrine disruption to the environment. Although electrolysis technology can degrade compounds such as PFAS, due to the low concentration of such pollutants in sewage, the electrolysis process often electrolyzes other compounds in water and sewage, and the energy consumption is particularly high. The degradation efficiency of such pollutants is very low, and the treatment effect is poor. Therefore, there is an urgent need for a treatment device that can quickly and efficiently treat new pollutants in wastewater. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a device and method for biological-intermittent electrolysis treatment of wastewater with new pollutants, which can effectively remove new pollutants in wastewater.

[0004] To solve the above technical problems, the embodiments of the present invention adopt the following technical solutions:

[0005] In the first aspect, an embodiment of the present invention provides a new pollutant wastewater biological-intermittent electrolysis treatment device, including a biological pool and an electrolytic cell, the top of the biological pool is connected to the top of the electrolytic cell through a water outlet device, and a water inlet pipe is provided at the bottom of the biological pool; an adsorption layer, a first supporting layer and a water outlet layer are provided in the electrolytic cell from top to bottom, and the water outlet layer is provided with a water outlet pipe; at least two oppositely arranged electrode plates are provided in the adsorption layer, and the electrode plates are connected to a power supply.

[0006] As a further improvement of the embodiment of the present invention, the adsorption layer is made of conductive polymer, graphene and its derivatives, carbon nanotubes, activated carbon composite materials or metal organic framework and carbon-based composite materials.

[0007] As a further improvement of the embodiment of the present invention, the electrode plates are arranged parallel to each other and spaced apart in the adsorption layer along the height direction of the electrolytic cell; two adjacent electrode plates are respectively connected to the positive electrode and the negative electrode of the power supply.

[0008] As a further improvement of the embodiment of the present invention, a second supporting layer is provided in the electrolytic cell, and a quartz sand filter layer is provided on the second supporting layer; the second supporting layer is located above the adsorption layer.

[0009] As a further improvement of the embodiment of the present invention, a water distribution layer, a third supporting layer and a biological material layer are sequentially arranged in the biological pool from bottom to top; and the water inlet pipe is arranged in the water distribution layer.

[0010] As a further improvement of the embodiment of the present invention, an aeration pipe is further provided in the water distribution layer.

[0011] As a further improvement of the embodiment of the present invention, a flushing discharge pipe is also provided on the top of the biological pool and is connected to the water outlet device.

[0012] In a second aspect, an embodiment of the present invention further provides a method for treating wastewater with new pollutants by biological-intermittent electrolysis, using the device for treating wastewater with new pollutants by biological-intermittent electrolysis provided in the first aspect; the method comprises:

[0013] Step 10, inputting wastewater from the water inlet pipe into the biological pool, the wastewater flows from bottom to top in the biological pool, and the organic pollutants in the wastewater are treated by biodegradation, and the treated wastewater enters the electrolytic cell through the water outlet device;

[0014] Step 20, the wastewater flows from top to bottom in the electrolytic cell, the adsorption layer adsorbs the pollutants in the wastewater, and the water after passing through the adsorption layer flows out from the outlet layer through the outlet pipe;

[0015] Step 30, detecting the concentration of pollutants in the water at the outlet of the outlet pipe, if the concentration exceeds a preset threshold, stopping the input of wastewater into the biological pool; turning on the power supply to energize the electrode plates to electrolyze the pollutants adsorbed in the adsorption layer; after a preset period of time, turning off the power supply and inputting wastewater into the biological pool.

[0016] As a further improvement of the embodiment of the present invention, in step 20, the wastewater flows from top to bottom in the electrolytic cell, first passes through the quartz sand filter layer, the quartz sand filter layer intercepts particulate matter in the wastewater, and then the wastewater flows to the adsorption layer.

[0017] As a further improvement of the embodiment of the present invention, in the flushing stage, clean water is input from the water inlet pipe into the biological pool to flush the biological pool, and the flushing water is discharged in sequence through the water outlet device and the flushing discharge pipe; clean water is input from the water outlet pipe into the electrolytic cell to flush the electrolytic cell, and the flushing water is discharged in sequence through the water outlet device and the flushing discharge pipe.

[0018] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0019] (1) The new pollutant wastewater biological-intermittent electrolysis treatment device and method provided by the present invention first utilizes a biological pool to biodegrade most of the organic pollutants in the wastewater, and then utilizes an electrolytic cell to adsorb new pollutants such as antibiotics and PFAS in the wastewater, effectively removing the new pollutants in the wastewater and concentrating the concentration of the new pollutants in the adsorption layer. The new pollutants in the adsorption layer are electrolyzed by intermittent power supply, which will not electrolyze too much water and other pollutants, thereby improving the electrolysis efficiency. The present invention first utilizes biological degradation to greatly reduce the concentration of pollutants in the wastewater before inputting them into the adsorption layer, which can reduce the processing burden of the adsorption layer, prevent the adsorption layer from being saturated in a short time, and improve the processing efficiency. The pollutant concentration in the effluent is monitored in real time. When the effluent pollutant concentration reaches a preset threshold, that is, the adsorption layer is about to be saturated, the electrode plate is energized to electrolyze the new pollutants in the adsorption layer. After a preset period of time, the power supply is stopped, thereby ensuring the processing efficiency while reducing energy consumption.

[0020] (2) The adsorption layer in the present invention is made of conductive material. The adsorption layer with conductive function can not only adsorb pollutants, but also, after the electrode plate is energized, on the one hand, the surface of the conductive material supplies electrons to the pollutants, and on the other hand, a large number of free radicals are generated on the surface of the conductive material to react with the pollutants adsorbed on the surface of the conductive material, thereby greatly improving the redox degradation ability, thereby reducing the energy consumption of electrolysis and improving the electrolysis efficiency.

[0021] (3) After the device of the present invention has been running for a period of time, the device can be flushed. The device can be flushed in the reverse direction from the bottom of the electrolytic cell, and the flushing water is discharged through the water outlet device and the flushing discharge pipe; the device can be flushed in the forward direction from the bottom of the biological pool, and the flushing water is also discharged through the flushing discharge pipe; the biological pool and the electrolytic cell are flushed independently, and the flushing water in the electrolytic cell does not flow into the biological pool, so as to prevent the particulate impurities in the electrolytic cell from entering the biological pool and affecting the treatment effect of the biological pool. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structural diagram of a new pollutant wastewater biological-intermittent electrolysis treatment device according to an embodiment of the present invention.

[0023] In the figure: biological pool 1, water distribution layer 11, third supporting layer 12, biological material layer 13, electrolytic cell 2, adsorption layer 21, first supporting layer 22, water outlet layer 23, second supporting layer 24, quartz sand filter layer 25, water outlet device 3, water inlet pipe 4, water outlet pipe 5, electrode plate 6, aeration pipe 7, flushing discharge pipe 8. DETAILED DESCRIPTION

[0024] The technical solution of the present invention is described in detail below.

[0025] The embodiment of the present invention provides a new pollutant wastewater biological-intermittent electrolysis treatment device, such as Figure 1As shown, it includes a biological pool 1 and an electrolytic pool 2, and the top of the biological pool 1 is connected to the top of the electrolytic pool 2 through a water outlet device 3. A water inlet pipe 4 is provided at the bottom of the biological pool 1. An adsorption layer 21, a first supporting layer 22 and a water outlet layer 23 are provided in the electrolytic pool 2 from top to bottom, and a water outlet pipe 5 is provided in the water outlet layer 23. At least two electrode plates 6 arranged opposite to each other are provided in the adsorption layer 21, and the electrode plates 6 are connected to a power supply. Among them, a water distribution layer 11, a third supporting layer 12 and a biological material layer 13 are provided in the biological pool 1 from bottom to top. The water inlet pipe 4 is arranged in the water distribution layer 11. The biological material layer 13 contains microorganisms for biodegrading organic pollutants in wastewater. A second supporting layer 24 is provided in the electrolytic pool 2, and a quartz sand filter layer 25 is provided on the second supporting layer 24. The second supporting layer 24 is located above the adsorption layer 21. The quartz sand filter layer 25 is used to intercept particulate matter, and the adsorption layer 21 is used to adsorb pollutants.

[0026] In the above embodiment, wastewater enters the biological pool 1 from the bottom of the biological pool 1 through the water inlet pipe 4, flows from bottom to top in the biological pool, and the biological material layer 13 biodegrades the organic pollutants in the wastewater, greatly reducing the concentration of pollutants in the wastewater. There are only very small amounts of organic pollutants and new pollutants such as antibiotics and PFAS that cannot be treated by biodegradation in the wastewater. The wastewater enters the electrolytic cell 2 through the water outlet device 3, flows from top to bottom in the electrolytic cell, and the quartz sand layer intercepts the particles in the wastewater, and then the wastewater flows into the adsorption layer 21. The adsorption layer 21 adsorbs a small amount of organic pollutants and new pollutants such as antibiotics and PFAS in the wastewater, and the water treated by the adsorption layer 21 flows out from the water outlet layer through the water outlet pipe. The concentration of pollutants in the water is detected at the outlet of the water outlet pipe. If the concentration exceeds the preset threshold, the input of wastewater into the biological pool is stopped. Turn on the power supply, so that the electrode plate is energized, and the pollutants adsorbed in the adsorption layer 21 are electrolyzed. After the preset time period, turn off the power supply and input wastewater into the biological pool.

[0027] The embodiment of the present invention first uses a biological pool to perform biodegradation treatment on wastewater, which can degrade most of the organic pollutants in the wastewater; then uses an electrolytic cell to adsorb new pollutants such as antibiotics and PFAS in the wastewater, which can effectively remove new pollutants in the wastewater and concentrate the concentration of new pollutants in the adsorption layer; finally, the new pollutants in the adsorption layer are electrolyzed by intermittent power supply, which will not electrolyze too much water and other pollutants, thereby improving the electrolysis efficiency. The present invention first uses biodegradation to greatly reduce the concentration of pollutants in the wastewater and then inputs it into the adsorption layer, which can reduce the processing burden of the adsorption layer, prevent the adsorption layer from being saturated in a short time, and improve the processing efficiency. The pollutant concentration in the effluent is monitored in real time. When the effluent pollutant concentration reaches a preset threshold, that is, the adsorption layer is about to be saturated, the electrode plate is energized to electrolyze the new pollutants in the adsorption layer, and after a preset time period, the power is stopped to ensure the processing efficiency while reducing energy consumption.

[0028] As a preferred example, the adsorption layer 21 is made of conductive polymers, graphene and its derivatives, carbon nanotubes, activated carbon composite materials, or metal organic framework and carbon-based composite materials.

[0029] The adsorption layer 21 made of one or more of the above materials can adsorb organic pollutants and have conductive properties. Among them, graphene has a very large specific surface area and highly adjustable surface chemical properties, can effectively adsorb a variety of organic pollutants, and has high conductivity. The tubular structure of carbon nanotubes enables it to effectively adsorb organic molecules, especially polycyclic aromatic hydrocarbons, and has strong conductivity. Conductive polymers (such as polypyrrole, polyaniline, etc.) can adsorb organic pollutants by adjusting their surface chemical properties and porous structures. These polymers have certain conductivity and can further improve their conductivity by doping and other methods. Activated carbon has a very large specific surface area and rich pore structure, and can adsorb a variety of organic pollutants. By compounding activated carbon with a conductive material (such as graphene, carbon nanotubes or conductive polymers), an activated carbon composite material is obtained, which can improve conductivity. Metal organic frameworks (MOFs) have adjustable pore structures and large specific surface areas, and can effectively adsorb organic pollutants. By combining MOFs with conductive materials (such as graphene and carbon nanotubes) to form metal-organic frameworks (MOFs) and carbon-based composites, the conductive properties can be improved.

[0030] In the above embodiment, the adsorption layer is made of conductive material. The adsorption layer with conductive function can not only adsorb pollutants, but also after the electrode plate is energized, on the one hand, the surface of the conductive material supplies electrons to the pollutants, and on the other hand, a large number of free radicals are generated on the surface of the conductive material to react with the pollutants adsorbed on the surface of the conductive material, thereby greatly improving the redox degradation ability, thereby reducing the energy consumption of electrolysis and improving the electrolysis efficiency.

[0031] As a preferred example, the electrode plates 6 are arranged parallel to each other and spaced apart in the adsorption layer 21 along the height direction of the electrolytic cell. Two adjacent electrode plates are connected to the positive and negative electrodes of the power source respectively. Figure 1 As shown, the adsorption layer 21 is provided with a plurality of electrode plates, and the number of electrode plates is set according to the thickness of the adsorption layer. From top to bottom, the first, third and fifth electrode plates are connected to the positive electrode of the power supply, and the second, fourth and sixth electrode plates are connected to the negative electrode of the power supply. By providing multiple layers of electrode plates, the distance between the positive and negative electrodes can be reduced, the energy density between the electrode plates can be increased, the pollutant degradation efficiency can be improved, and the energy consumption can be reduced.

[0032] Preferably, an aeration pipe 7 is further provided in the water distribution layer 11. The aeration pipe 7 is used to aerate the biological pool 1, cultivate microorganisms in the biological material layer, and improve the biodegradation efficiency.

[0033] Preferably, a flushing discharge pipe 8 is further provided at the top of the biological pool 1, and the flushing discharge pipe 8 is connected to the water outlet device 3. After the device has been running for a period of time, the device can be flushed, and clean water is input from the bottom of the electrolytic cell for reverse flushing, and the flushed water is discharged through the water outlet device and the flushing discharge pipe. Clean water is input from the bottom of the biological pool for forward flushing, and the flushed water is also discharged through the flushing discharge pipe. The biological pool and the electrolytic cell are flushed independently, and the flushed water in the electrolytic cell does not flow into the biological pool, so as to prevent the particulate impurities in the electrolytic cell from entering the biological pool and affecting the treatment effect of the biological pool.

[0034] The present invention also provides a method for treating wastewater with new pollutants by biological-intermittent electrolysis, using Figure 1 The new pollutant wastewater biological-intermittent electrolysis treatment device shown. The method includes:

[0035] Step 10, inputting wastewater from the water inlet pipe into the biological pool 1, the wastewater flows from bottom to top in the biological pool, and the organic pollutants in the wastewater are treated by biodegradation. The treated wastewater containing new pollutants enters the electrolytic cell 2 through the water outlet device 3.

[0036] Step 20, the wastewater flows from top to bottom in the electrolytic cell, the adsorption layer 21 adsorbs the pollutants in the wastewater, and the water treated by the adsorption layer 21 flows out from the outlet layer through the outlet pipe.

[0037] Step 30, detect the concentration of pollutants in the water at the outlet of the water outlet pipe. If the concentration exceeds a preset threshold, stop inputting wastewater into the biological pool. Turn on the power supply to energize the electrode plate to electrolyze the new pollutants adsorbed in the adsorption layer 21. After a preset period of time, turn off the power supply and input wastewater into the biological pool.

[0038] The method of the embodiment of the present invention first utilizes biodegradation to greatly reduce the concentration of pollutants in the wastewater before inputting it into the adsorption layer, which can reduce the processing burden of the adsorption layer and prevent the adsorption layer from being saturated in a short time, thereby improving the processing efficiency and extending the continuous processing time. The concentration of pollutants in the effluent is monitored in real time. When the concentration of pollutants in the effluent reaches a preset threshold, that is, the adsorption layer is about to be saturated, the electrode plate is energized to electrolyze the new pollutants in the adsorption layer, and after a preset time period, the power is stopped to ensure the processing efficiency while reducing energy consumption.

[0039] As a preferred example, in step 20 , the wastewater flows from top to bottom in the electrolytic cell, first passes through the quartz sand filter layer 25 , the quartz sand filter layer 25 intercepts particulate matter in the wastewater, and then the wastewater flows to the adsorption layer 21 .

[0040] As a preferred example, in the flushing stage, clean water is input from the water inlet pipe into the biological pool to flush the biological pool, and the flushing water is discharged through the water outlet device and the flushing discharge pipe in sequence; clean water is input from the water outlet pipe into the electrolytic cell to flush the electrolytic cell, and the flushing water is discharged through the water outlet device and the flushing discharge pipe in sequence.

[0041] In this embodiment, the biological pool and the electrolytic pool are flushed independently, and the flushing water in the electrolytic pool does not flow into the biological pool, so as to prevent the particulate impurities in the electrolytic pool from entering the biological pool and affecting the treatment effect of the biological pool.

[0042] The basic principles, main features and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above specific embodiments, and the descriptions in the above specific embodiments and the specification are only for further illustrating the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A method for treating new pollutant wastewater by biological-intermittent electrolysis, characterized in that: A new pollutant wastewater biological-intermittent electrolysis treatment device is used; the new pollutant wastewater biological-intermittent electrolysis treatment device comprises a biological pool (1) and an electrolytic pool (2); the top of the biological pool (1) is connected to the top of the electrolytic pool (2) through a water outlet device (3), and the bottom of the biological pool (1) is provided with a water inlet pipe (4); the electrolytic pool (2) is provided with an adsorption layer (21), a first supporting layer (22) and a water outlet layer (23) from top to bottom, and the water outlet layer (23) is provided with a water outlet pipe (5); at least two electrode plates (6) arranged opposite to each other are provided in the adsorption layer (21), and the electrode plates (6) are connected to a power source; the adsorption layer (21) is made of conductive polymer, graphene and its derivatives, carbon nanotubes, activated carbon composite materials or metal organic framework and carbon-based composite materials; the electrode plates (6) are arranged in parallel and spaced apart in the adsorption layer (21) along the height direction of the electrolytic pool; two adjacent electrode plates are respectively connected to the positive electrode and the negative electrode of the power source; The method comprises: Step 10, inputting wastewater from the water inlet pipe into the biological pool (1), the wastewater flows from bottom to top in the biological pool, and most of the organic pollutants in the wastewater are treated by biodegradation, and the treated wastewater enters the electrolytic pool (2) through the water outlet device (3); Step 20, the wastewater with greatly reduced pollutant concentration flows from top to bottom in the electrolytic cell, the adsorption layer (21) adsorbs the pollutants in the wastewater, so that the pollutants are concentrated in the adsorption layer, and the water after passing through the adsorption layer (21) flows out from the outlet layer through the outlet pipe; Step 30, detecting the concentration of pollutants in the water at the outlet of the outlet pipe, and if the concentration exceeds a preset threshold, stopping the input of wastewater into the biological pool; turning on the power supply to energize the electrode plates to electrolyze the pollutants adsorbed in the adsorption layer (21); after a preset period of time, turning off the power supply and inputting wastewater into the biological pool.

2. The method for treating new pollutant wastewater by biological-intermittent electrolysis according to claim 1, characterized in that: A second supporting layer (24) is provided in the electrolytic cell (2), and a quartz sand filter layer (25) is provided on the second supporting layer (24); the second supporting layer (24) is located above the adsorption layer (21).

3. The method for treating new pollutant wastewater by biological-intermittent electrolysis according to claim 1, characterized in that: The biological pool (1) is provided with a water distribution layer (11), a third supporting layer (12) and a biological material layer (13) in sequence from bottom to top; the water inlet pipe (4) is arranged in the water distribution layer (11).

4. The method for treating new pollutant wastewater by biological-intermittent electrolysis according to claim 3, characterized in that: An aeration pipe (7) is also provided in the water distribution layer (11).

5. The method for treating new pollutant wastewater by biological-intermittent electrolysis according to claim 1, characterized in that: The top of the biological pool (1) is also provided with a flushing discharge pipe (8) which is connected to the water outlet device (3).

6. The method for treating new pollutant wastewater by biological-intermittent electrolysis according to claim 2, characterized in that: In step 20, the wastewater flows from top to bottom in the electrolytic cell, first passing through the quartz sand filter layer (25), the quartz sand filter layer (25) intercepts particulate matter in the wastewater, and then the wastewater flows to the adsorption layer (21).

7. The method for treating new pollutant wastewater by biological-intermittent electrolysis according to claim 1, characterized in that: During the flushing stage, clean water is input from the water inlet pipe into the biological pool to flush the biological pool, and the flushing water is discharged through the water outlet device and the flushing discharge pipe in sequence; clean water is input from the water outlet pipe into the electrolytic cell to flush the electrolytic cell, and the flushing water is discharged through the water outlet device and the flushing discharge pipe in sequence.

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