Double-pulse internal aeration type electro-Fenton device

Abstract

The utility model discloses a double-pulse internal aeration type electro-Fenton device, which relates to the technical field of sewage treatment equipment and comprises an electrolytic bath, a plurality of cathode plates and anode plates are arranged in the electrolytic bath at intervals, a water inlet and a water outlet are respectively arranged at two diagonal positions of the electrolytic bath, the cathode plates comprise a plurality of small cathode plates, and the anode plates comprise a plurality of small cathode plates. The small cathode plates are spliced on the same plane, and each small cathode plate is of a hollow honeycomb plate structure; the positive electrode of the power supply system is connected with the positive plates, and the negative electrode of the power supply system is connected with each small negative plate through a pulse switch; the aeration system is respectively connected with each small cathode plate; the control system is in control connection with the power supply system and the aeration system; the electro-Fenton device solves the problems of low hydrogen peroxide yield, side reaction decomposition of hydrogen peroxide at a polar plate, poor hydroxyl radical mass transfer, low utilization rate, high treatment cost and the like in the traditional electro-Fenton device.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewage treatment equipment, and more specifically relates to a double-pulse internal aeration type electric Fenton device. Background Art

[0002] In the field of sewage treatment, industrial wastewater is extremely difficult to treat due to its complex pollutant composition, high pollutant concentration, poor biodegradability and many other factors. Especially for high-salt industrial wastewater with high salt content, its high salt characteristics will cause the osmotic pressure of microbial cells to change and lead to the death of microorganisms, so the traditional biochemical treatment effect is very poor. At present, the treatment of industrial high-salt wastewater mainly uses advanced oxidation method.

[0003] The mainstream methods of advanced oxidation include ozone catalytic oxidation, photocatalytic oxidation, Fenton oxidation, electro-Fenton, etc. Ozone catalytic oxidation mainly uses ozone to decompose hydroxyl radicals through catalysts to degrade long-chain macromolecular pollutants in water by chain breaking and ring removal or direct mineralization. However, in the treatment of high-salt wastewater, various anions and cations in the high-salt wastewater will adhere to the surface of the catalyst and react with the active sites on the surface of the catalyst, thereby passivating and deactivating the catalyst. Therefore, the catalyst for ozone catalyst oxidation needs to be replaced regularly. The cost of ozone catalyst accounts for a large proportion of the ozone catalytic oxidation process. Regular replacement of catalysts will increase the time and economic cost of treating tons of water. The photocatalytic oxidation process has high requirements for the chromaticity of water, general treatment efficiency and high operating costs, which has great limitations in engineering applications. Fenton oxidation is to oxidize hydrogen peroxide by ferrous ions in an acidic environment to produce a large number of hydroxyl radicals, and degrade pollutants in water through the action of hydroxyl radicals. However, hydrogen peroxide is used in Fenton oxidation, which is dangerous during transportation and storage, and the pH adjustment and iron sludge treatment will also increase the processing cost. Therefore, traditional Fenton oxidation is not a good choice. Electro-Fenton is similar to traditional Fenton, the difference lies in the source of hydrogen peroxide. Traditional electro-Fenton promotes the Fenton reaction by producing hydrogen peroxide at the cathode through electrolysis. Although electro-Fenton solves the problems of transportation and storage of hydrogen peroxide, its high energy consumption, low hydrogen peroxide production, and low utilization rate of hydroxyl radicals still need to be solved.

[0004] Traditional advanced oxidation methods have many constraints in treating high-salt industrial wastewater, and the problem of high-salt wastewater treatment needs to be solved urgently. Utility Model Content

[0005] The utility model aims to provide a double-pulse internal aeration electro-Fenton device in view of the deficiencies in the prior art. The electro-Fenton device solves the problems of low hydrogen peroxide production, side reaction decomposition of hydrogen peroxide at the electrode plate, poor mass transfer of hydroxyl radicals, low utilization rate and high processing cost in traditional electro-Fenton.

[0006] In order to achieve the above object, the utility model provides a double-pulse internal aeration type electro-Fenton device, comprising:

[0007] An electrolytic cell, wherein a plurality of cathode plates and anode plates are arranged at intervals in the electrolytic cell, a water inlet and a water outlet are respectively arranged at two diagonal positions of the electrolytic cell, the cathode plate comprises a plurality of small cathode plates, the small cathode plates are spliced ​​on the same plane, and the small cathode plates are hollow honeycomb plate structures;

[0008] A power supply system, the positive electrode of which is respectively connected to the anode plate, and the negative electrode of which is respectively connected to each of the small cathode plates through a pulse switch;

[0009] an aeration system, connected to each of the small cathode plates, respectively, wherein the gas introduced into the small cathode plates by the aeration system includes ozone;

[0010] A control system is connected to the power supply system and the aeration system.

[0011] Optionally, a plurality of quick-release slots are movably provided at the bottom of the electrolytic cell, and the quick-release slots are detachably connected to the cathode plate and the anode plate.

[0012] Optionally, the distance between the cathode plate or the anode plate located at the outermost side and the cell wall of the electrolytic cell is not less than 200 mm, and the distance between adjacent cathode plates and anode plates is 20 mm-50 mm.

[0013] Optionally, an insulating frame is provided at the edge of the small cathode plate.

[0014] Optionally, the small cathode plate is made of titanium, the anode plate is made of iron, the porosity of the small cathode plate is 40%-50%, and the micropore diameter of the small cathode plate is less than 10 microns.

[0015] Optionally, the aeration system includes an air compressor and an air tank, which are connected by a pipeline. The outlet of the air tank is connected to a solenoid valve group, which is controlled by a pulse controller. The solenoid valve group consists of multiple solenoid valves, and each solenoid valve is connected one-to-one to the small cathode plate.

[0016] Optionally, a dosing system is further included, and the dosing system includes a plurality of chemical tanks, and the chemical tanks are connected to the electrolytic cell via a dosing pump.

[0017] Optionally, the dosing system includes the reagent tank filled with 98% sulfuric acid and the reagent tank filled with 30% hydrogen peroxide.

[0018] Optionally, an online monitoring system is provided in the electrolytic cell, and the online monitoring system comprises a pH probe and a COD probe connected to the control system.

[0019] Optionally, a slag discharge port is provided on the side wall of the electrolytic cell.

[0020] The utility model provides a double-pulse internal aeration type electro-Fenton device, which has the beneficial effects of: under the condition of low power consumption, the electro-Fenton device solves the problems of low oxygen mass transfer efficiency, small amount of hydrogen peroxide produced at the cathode plate, hydrogen peroxide being reduced and consumed again, and short existence time and low utilization rate of hydroxyl free radicals, and also has the advantages of low reagent consumption, high degree of automation, strong economy, etc.

[0021] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present invention.

[0023] Figure 1 A schematic structural diagram of a double-pulse internal aeration electro-Fenton device according to an embodiment of the utility model is shown.

[0024] Figure 2 A schematic structural diagram of a cathode plate according to an embodiment of the utility model is shown.

[0025] Description of reference numerals:

[0026] 1. Electrolytic cell; 2. Cathode plate; 3. Anode plate; 4. Water inlet; 5. Water outlet; 6. Small cathode plate; 7. Power supply system; 8. Pulse switch; 9. Aeration connector; 10. Aeration system; 11. Control system; 12. Quick release card slot; 13. Insulation frame; 14. Air compressor; 15. Gas storage tank; 16. Solenoid valve group; 17. Dosing system; 18. Chemical tank; 19. Dosing pump; 20. Online monitoring system; 21. pH probe; 22. COD probe; 23. Slag discharge port. DETAILED DESCRIPTION

[0027] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0028] The utility model provides a double-pulse internal aeration type electro-Fenton device, comprising:

[0029] An electrolytic cell, wherein a plurality of cathode plates and anode plates are arranged at intervals in the electrolytic cell, a water inlet and a water outlet are arranged at two diagonal positions of the electrolytic cell respectively, the cathode plate comprises a plurality of small cathode plates, the small cathode plates are spliced ​​on the same plane, and the small cathode plates are hollow honeycomb plate structures;

[0030] The positive electrode of the power supply system is connected to the anode plate respectively, and the negative electrode of the power supply system is connected to each small cathode plate through a pulse switch respectively;

[0031] an aeration system, connected to each small cathode plate, respectively, wherein the gas introduced into the small cathode plate by the aeration system includes ozone;

[0032] Control system, connected with power supply system and aeration system control.

[0033] Specifically, the electro-Fenton device includes an electrolytic cell, a power supply system and an aeration system. Cathode plates and anode plates are arranged at intervals in the electrolytic cell. When sewage enters the electrolytic cell, the control system starts the power supply system and the aeration system according to the real-time monitoring value of the sewage. The aeration system transports gas to the small cathode plate, and evenly aerates the electrolytic cell through the micropores of the small cathode plate. The power supply system controls the small cathode plate to start and stop in sequence to achieve cyclic electrolysis. In a short time, a gas-liquid-solid three-combination interface is formed in the gap of the cathode plate, and a gas diffusion electrode working environment appears. Since the interior of the small cathode plate is a honeycomb structure, the gas-liquid-solid three-combination interface is not only formed on the surface of the cathode plate, but also in the honeycomb pores inside the small cathode plate, which greatly increases the reaction area. Since the solubility of oxygen in the air is about 45mmol, and the solubility of dissolved oxygen in water is only about 1mmol, and the way to produce hydrogen peroxide is to rely on the reduction of oxygen atoms at the cathode plate to generate hydrogen peroxide with a two-electron structure, the amount of oxygen introduced in the air is much higher than the amount of dissolved oxygen in the water, and there is more oxygen around the cathode plate that can be used, thus greatly increasing the production of hydrogen peroxide around the cathode plate. In addition, because the cathode plate is composed of a plurality of small cathode plates with a hollow honeycomb plate structure, the interior of the cathode plate is continuously impacted by gas, which can effectively avoid the passivation of the cathode plate structure. When ozone is introduced into the small anode plate in the aeration system, the organic matter in the sewage in the electrolytic cell can be oxidized and decomposed, thereby eliminating odor and killing bacteria and viruses in the sewage, thereby reducing the pollution of sewage to the environment.

[0034] Optionally, a plurality of quick-release slots are movably provided at the bottom of the electrolytic cell, and the quick-release slots are detachably connected to the cathode plate and the anode plate.

[0035] Optionally, the distance between the outermost cathode plate or anode plate and the cell wall of the electrolytic cell is not less than 200 mm, and the distance between adjacent cathode plates and anode plates is 20 mm-50 mm.

[0036] Specifically, the electrolytic cell adopts a tumbling type electrolytic cell, and the installation direction of the cathode plate and the anode plate is parallel to the water flow direction, which can avoid mechanical damage to the cathode plate and the anode plate caused by the impact of the water flow; in addition, a detachable quick-release card slot is provided inside the electrolytic cell to facilitate the disassembly and assembly of the electrode plates, so that the distance between the electrode plates can be adjusted.

[0037] Optionally, an insulating frame is provided at the edge of the small cathode plate.

[0038] Specifically, each cathode plate is composed of 4 small cathode plates, each small cathode plate is individually connected to a pulse switch, and each small cathode plate is connected to the aeration system through an aeration joint; an insulating frame is used to seal the edges around the small cathode plates, which makes it easy to install the small cathode plates by plugging and unplugging.

[0039] Optionally, the material of the small cathode plate is titanium, the material of the anode plate is iron, the porosity of the small cathode plate is 40%-50%, and the micropore diameter of the small cathode plate is less than 10 microns.

[0040] Specifically, when the electro-Fenton device is powered on, the anode plate can precipitate ferrous ions, the cathode plate undergoes a reduction reaction to generate hydrogen peroxide, and a Fenton oxidation reaction occurs in the electrolytic cell to achieve the removal of pollutants.

[0041] Optionally, the aeration system includes an air compressor and an air tank, which are connected by a pipeline. The outlet of the air tank is connected to a solenoid valve group, which is controlled by a pulse controller. The solenoid valve group consists of multiple solenoid valves, and each solenoid valve is connected one-to-one to a small cathode plate.

[0042] Specifically, the solenoid valve in the aeration system is a solenoid valve with a pulse controller. The controller adopts a time reciprocating cycle control mode, which can control the start and stop time of each independent solenoid valve in a linked manner. The pulse switch that supplies power to the small cathode plate is an electromagnetic time relay, and the operation mode is a time reciprocating cycle, and the switch time can be adjusted at will, so that the pulse switch of each small cathode plate and the solenoid valve with a pulse controller can realize synchronous start and stop of the two.

[0043] Optionally, a dosing system is also included, which includes a plurality of reagent tanks, and the reagent tanks are connected to the electrolytic cell via a dosing pump.

[0044] Optionally, the dosing system includes a reagent tank filled with 98% sulfuric acid and a reagent tank filled with 30% hydrogen peroxide.

[0045] Specifically, the dosing system can add pH regulator and enhancer to the electrolytic cell. After starting the dosing pump, it is connected to the dosing port on the electrolytic cell through the dosing pipeline. In this way, according to the feedback data of the online monitoring system, the control system can control the dosing amount of the dosing system.

[0046] Optionally, an online monitoring system is provided in the electrolytic cell, and the online monitoring system includes a pH probe and a COD probe connected to the control system.

[0047] Specifically, when the online monitoring system detects that the COD index in the sewage is higher than the set value, the control system will start the dosing pump to add enhancer into the electrolytic cell to ensure that the effluent COD meets the standard.

[0048] Optionally, a slag discharge port is provided on the side wall of the electrolytic cell. When the electro-Fenton device stops running, the sludge in the device can be discharged through the slag discharge port.

[0049] Example

[0050] like Figure 1 to Figure 2 As shown, the utility model provides a double-pulse internal aeration type electro-Fenton device, comprising:

[0051] An electrolytic cell 1, wherein a plurality of cathode plates 2 and anode plates 3 are arranged at intervals in the electrolytic cell 1, a water inlet 4 and a water outlet 5 are respectively arranged at two diagonal positions of the electrolytic cell 1, the cathode plate 2 comprises four small cathode plates 6, the small cathode plates 6 are spliced ​​on the same plane, and the small cathode plates 6 are hollow honeycomb plate structures;

[0052] A power supply system 7, the positive electrode of which is respectively connected to the anode plate 3, and a negative electrode of which is respectively connected to each small cathode plate 6 through a pulse switch 8;

[0053] an aeration system 10, connected to the aeration connector 9 of each small cathode plate 6;

[0054] The control system 11 is connected to the power supply system 7 and the aeration system 10 for control.

[0055] In this embodiment, a plurality of quick-release slots 12 are movably provided at the bottom of the electrolytic cell 1 , and the quick-release slots 12 are detachably connected to the cathode plate 2 and the anode plate 3 .

[0056] In this embodiment, the distance between the outermost cathode plate 2 or anode plate 3 and the cell wall of the electrolytic cell 1 is not less than 200 mm, and the distance between adjacent cathode plates 2 and anode plates 3 is 20 mm-50 mm.

[0057] In this embodiment, an insulating frame 13 is provided at the edge of the small cathode plate 6 .

[0058] In this embodiment, the material of the small cathode plate 6 is titanium, the material of the anode plate 3 is iron, the porosity of the small cathode plate 6 is 40%-50%, and the micropore diameter of the small cathode plate 6 is less than 10 microns.

[0059] In this embodiment, the aeration system 10 includes an air compressor 14 and an air tank 15, which are connected by a pipeline. The air tank 15 is provided with a solenoid valve group 16, which includes a plurality of solenoid valves, each of which is connected one-to-one with a small cathode plate 6.

[0060] In this embodiment, a dosing system 17 is further included. The dosing system 17 includes a plurality of reagent tanks 18 . The reagent tanks 18 are connected to the electrolytic cell 1 via a dosing pump 19 .

[0061] In this embodiment, the dosing system 17 includes a reagent tank filled with 98% sulfuric acid and a reagent tank filled with 30% hydrogen peroxide.

[0062] In this embodiment, an online monitoring system 20 is provided in the electrolytic cell 1 , and the online monitoring system 20 includes a pH probe 21 and a COD probe 22 connected to the control system 10 .

[0063] In this embodiment, a slag discharge port 23 is provided on one side of the electrolytic cell 1 close to the water inlet 4 .

[0064] In summary, each cathode plate 2 in the double-pulse internal aeration electro-Fenton device is composed of four small cathode plates 6, each of which is individually connected to a pulse switch 8 and an aeration connector 9. The small cathode plate 6 is connected to the pulse switch 8 through a power supply wire, and the pulse switch 8 is connected to the negative pole of the DC power supply, while the anode plate 3 is directly connected to the positive pole of the DC power supply through a power supply wire. The air compressor 14 is connected to the gas storage tank 15 through a pipeline, and the gas storage tank 15 is connected to the controllable pulse electromagnetic valve group 16. The outlet of the electromagnetic valve group 16 is connected to the aeration connector 9, and the aeration connector 9 is directly connected to the hollow flat honeycomb titanium cathode plate 2. When the electro-Fenton device is in operation, the pH probe 21 and the COD probe 22 are set in the electrolytic cell 1, and real-time monitoring data is obtained through the two probes. The monitoring data is fed back to the PLC automatic control system, and the PLC automatic control system compares the feedback data with the set value. When it exceeds or falls below the set value, the dosing system 17 will be started and stopped for regulation.

[0065] When sewage enters the electrolytic cell 1, the pH probe 21 is first started to feed back real-time data to the PLC automatic control system. The PLC automatic control system will add chemicals by adjusting the dosing pump 19. After the added chemicals enter the electrolytic cell 1, the chemicals are evenly dissolved in the sewage due to the aeration inside the cathode plate 2, thereby adjusting the pH value of the sewage to the set range.

[0066] When the pH of the sewage reaches the standard, the DC power supply is started to electrolyze the sewage in the electrolytic cell 1, wherein each small cathode plate 6 controls the cycle start and stop through the pulse switch 8 to realize cyclic batch electrolysis. When the pulse switch 8 corresponding to one of the small cathode plates 6 is in the on state, the corresponding solenoid valve is started at the same time, and the gas is evenly released through the internal honeycomb structure of the small cathode plate 6. In a short time, a gas-liquid-solid three-combination interface is formed in the gap of the cathode plate 2, and a gas diffusion electrode working environment appears. The special honeycomb structure inside the cathode plate 2 makes the gas-liquid-solid three-combination interface not only formed on the surface of the cathode plate, but also formed in the honeycomb pores inside the cathode plate 2, which greatly increases the contact area.

[0067] In the electrolytic process, the cathode plate 2 not only produces hydrogen peroxide, but also has a side reaction of hydrogen peroxide being reduced to water. When the pulse switch 8 is closed, the small cathode plate 6 stops electrolysis, cutting off the side reaction of hydrogen peroxide being reduced to water, thereby avoiding the waste of hydrogen peroxide. When the electric Fenton device is working, each small cathode plate 6 is energized and de-energized in turn, thereby avoiding the reduction of hydrogen peroxide in the electrolytic process, thereby strengthening the Fenton reaction in the electrolytic cell. In addition, the anode plate 3 continuously electrolyzes and dissolves ferrous ions in the electrolytic process, and the ferrous ions catalyze the hydrogen peroxide produced at the cathode plate 2 to produce hydroxyl radicals and a series of chain reactions. The hydroxyl radicals produced in the electrolytic cell 1 can oxidize pollutants in the water, and iron ions generate iron hydroxide precipitation. The pollutant colloid oxidized can be adsorbed by the iron hydroxide precipitation to achieve the removal of pollutants. At the same time, since the cathode plate 2 has an aeration effect, the diffusion of hydrogen peroxide is enhanced, and the contact catalytic effect of ferrous iron and hydrogen peroxide in the electrolytic cell 1 is strengthened, thereby generating more hydroxyl radicals. The hydroxyl radicals are also affected by aeration and react quickly with pollutants in the water, reducing the decomposition waste of hydroxyl radicals.

[0068] The various embodiments of the utility model have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A double pulse internal aeration type electro-Fenton device, characterized in that: include: An electrolytic cell, wherein a plurality of cathode plates and anode plates are arranged at intervals in the electrolytic cell, a water inlet and a water outlet are respectively arranged at two diagonal positions of the electrolytic cell, the cathode plate comprises a plurality of small cathode plates, the small cathode plates are spliced ​​on the same plane, and the small cathode plates are hollow honeycomb plate structures; A power supply system, the positive electrode of which is respectively connected to the anode plate, and the negative electrode of which is respectively connected to each of the small cathode plates through a pulse switch; an aeration system, connected to each of the small cathode plates, respectively, wherein the gas introduced into the small cathode plates by the aeration system includes ozone; A control system is connected to the power supply system and the aeration system.

2. The double-pulse internal aeration electro-Fenton device according to claim 1, characterized in that: A plurality of quick-release slots are movably arranged at the bottom of the electrolytic cell, and the quick-release slots are detachably connected to the cathode plate and the anode plate.

3. The double-pulse internal aeration electro-Fenton device according to claim 2, characterized in that: The distance between the cathode plate or the anode plate located at the outermost side and the cell wall of the electrolytic cell is not less than 200 mm, and the distance between adjacent cathode plates and anode plates is 20 mm-50 mm.

4. The double-pulse internal aeration electro-Fenton device according to claim 1, characterized in that: The edge of the small cathode plate is provided with an insulating frame.

5. The double-pulse internal aeration electro-Fenton device according to claim 4, characterized in that: The material of the small cathode plate is titanium, the material of the anode plate is iron, the porosity of the small cathode plate is 40%-50%, and the micropore diameter of the small cathode plate is less than 10 microns.

6. The double-pulse internal aeration electro-Fenton device according to claim 1, characterized in that: The aeration system includes an air compressor and an air storage tank, which are connected by a pipeline. The outlet of the air storage tank is connected to a solenoid valve group, which is controlled by a pulse controller. The solenoid valve group consists of multiple solenoid valves, and each solenoid valve is connected one-to-one with the small cathode plate.

7. The double-pulse internal aeration electro-Fenton device according to claim 1, characterized in that: It also includes a dosing system, which includes a plurality of chemical tanks, and the chemical tanks are connected to the electrolytic cell via a dosing pump.

8. The double-pulse internal aeration electro-Fenton device according to claim 7, characterized in that: The dosing system includes the reagent tank filled with 98% sulfuric acid and the reagent tank filled with 30% hydrogen peroxide.

9. The double-pulse internal aeration electro-Fenton device according to claim 1, characterized in that: An online monitoring system is arranged in the electrolytic cell, and the online monitoring system comprises a pH probe and a COD probe connected to the control system.

10. The double-pulse internal aeration electro-Fenton device according to claim 1, characterized in that: The side wall of the electrolytic cell is provided with a slag discharge port.

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