CN106830453A - The method and apparatus of photoelectrocatalysioxidization oxidization Electro Sorb collaboration treatment high-salt wastewater - Google Patents

Abstract

The invention provides a method and equipment for co-processing high-salt wastewater by photoelectrocatalytic oxidation-electro-adsorption, which relates to the field of wastewater treatment. The high-salt wastewater is charged into an electrolytic cell, and after electrification, the cathode electrode plate and the anode electrode plate are brought close to each other. Or far away, discharge the high-salt wastewater after photocatalytic oxidation into the electro-adsorption device. The electro-adsorption device is equipped with a first electro-adsorption module and a second electro-adsorption module that can operate independently. The first electro-adsorption module and the second electro-adsorption module The electro-adsorption module alternately conducts electro-adsorption treatment and regeneration treatment of high-salt wastewater. The regeneration treatment is: sequentially use photocatalytic oxidation of high-salt wastewater, electro-adsorption produced water, and acid solution washing. This method can effectively save water resources and promote Photocatalytic oxidation efficiency and electrosorption efficiency. The invention also provides a device for performing photoelectric catalytic oxidation-electric adsorption synergistic treatment on high-salt wastewater, which has simple operation and good wastewater treatment effect.

Description

Method and equipment for co-treatment of high-salt wastewater by photoelectrocatalytic oxidation and electro-adsorption

technical field

The invention relates to the field of waste water treatment, and in particular to a method and equipment for co-processing high-salt waste water through photoelectric catalytic oxidation and electric adsorption.

Background technique

As a desalination technology with strong adaptability, simple maintenance, convenient operation and good treatment effect, Electrosorption Technology (Electrosorption Technology, EST) has gradually become the field of water treatment technology in recent years due to its good environmental protection and energy saving characteristics. a major research hotspot. Practical engineering applications show that the existing electro-adsorption desalination system is difficult to give full play to its advantages in the field of high brine treatment, which also limits the promotion and application of electro-adsorption technology to a certain extent. The electro-adsorption process usually uses raw water during regeneration, which consumes a lot of water resources, and after regeneration, the electrode adsorption effect is not good. As an advanced oxidation treatment technology, photocatalytic oxidation technology generates a large number of strong oxidizing groups in the system through photocatalysis on the surface of the plate, such as hydroxyl radicals, so that the pollutants in the wastewater are decomposed into carbon dioxide and water, and the pollution of pollutants is realized. The rapid and effective removal of photoelectric catalytic oxidation technology in the advanced treatment of industrial wastewater has the characteristics of strong oxidation, no selectivity to pollutants, and short reaction time. However, there are also some technical problems at the same time. The capacity is low, and the catalytic reaction rate of radio and television cannot be effectively adjusted. Pollution resistance of the plates is poor, and the surface of the plates is easy to scale. After a long time of operation, the coating will fall off, the service life of the plates will be reduced, and the water quality and system operation will be affected stability.

Contents of the invention

The purpose of the present invention is to provide a method for co-processing high-salt wastewater by photoelectrocatalytic oxidation and electrosorption, which can effectively save water resources, promote photocatalytic oxidation efficiency and electrosorption efficiency, and effectively save wastewater treatment costs.

Another object of the present invention is to provide a photoelectric catalytic oxidation-electro-adsorption co-processing equipment for high-salt wastewater, which can effectively save water resources, promote photoelectric catalytic oxidation efficiency and electro-adsorption efficiency, and effectively save wastewater treatment costs.

The present invention solves its technical problems by adopting the following technical solutions.

The present invention proposes a method for co-processing high-salt wastewater by photoelectrocatalytic oxidation-electric adsorption. The high-salt wastewater is charged into the electrolytic cell, the cathode electrode plate and the anode electrode plate are contacted with the high-salt wastewater, and after electrification, the cathode electrode The plate and the anode electrode plate are close to or far away from each other. After the photocatalytic oxidation is completed, the high-salt wastewater after the photocatalytic oxidation is discharged into the electrosorption device.

The electro-adsorption device is equipped with a first electro-adsorption module and a second electro-adsorption module that can operate independently. The first electro-adsorption module and the second electro-adsorption module alternately perform electro-adsorption treatment and regeneration treatment of high-salt wastewater, and the regeneration treatment is carried out according to The following method is carried out: washing with high-salt wastewater after photocatalytic oxidation, electro-adsorption produced water and acid solution in sequence.

The present invention also proposes a photoelectric catalytic oxidation-electric adsorption co-processing equipment, including a power source, a photoelectric catalytic oxidation device electrically connected to the power source, an electro-adsorption device, and a control system. The photoelectric catalytic oxidation device is equipped with an electrolytic cell, and the electrolytic cell An anode electrode plate, a cathode electrode plate, and an ultraviolet lamp electrically connected to the power supply are provided. The photoelectric catalytic oxidation device has an opening. The photoelectric catalytic oxidation device includes a first slider and a second slider slidingly embedded in the opening. The first slider block and the second slider are respectively connected with the anode electrode plate and the cathode electrode plate and drive the anode electrode plate and the cathode electrode plate to slide along the extension direction of the opening so that the cathode electrode plate and the anode electrode plate are close to or far away from each other, the first slider, The second sliders are connected with a power mechanism through transmission, the power mechanism is electrically connected with the control system, and the electrolytic cell is filled with a photoelectric catalyst.

Wherein, the electro-adsorption device includes a first electro-adsorption module, a second electro-adsorption module, and an acid liquid storage tank, and the first electro-adsorption module and the second electro-adsorption module are respectively connected with the electrolytic cell, the water production pool, and the acid liquid storage tank through valves , the control system is electrically connected to the valve.

The beneficial effect of the method and equipment for the photoelectric catalytic oxidation-electro-adsorption cooperative treatment of high-salt wastewater provided by the embodiment of the present invention is: the method is effectively Degrade the organic matter in the high-salt wastewater and remove the salt. The high-salt wastewater, electro-adsorption produced water, and acid solution after the photoelectric catalytic oxidation device are used to wash the first electro-adsorption module or the second electro-adsorption module for regeneration, effectively saving water. resources, and descaling by acid solution can effectively remove the sediment remaining in the first electro-adsorption module or the second electro-adsorption module, improve the adsorption efficiency, and alternately carry out high-salt The electro-adsorption treatment and regeneration treatment of wastewater can ensure the stability of the photoelectric catalytic oxidation-electro-adsorption co-treatment of high-salt wastewater, and the equipment prepared by the method of co-treatment of high-salt wastewater by photocatalytic oxidation and electro-adsorption can effectively save water , improve the efficiency of photoelectrocatalytic oxidation-electroadsorption co-treatment of high-salt wastewater and ensure the stability of its operation.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and thus It should be regarded as a limitation on the scope, and those skilled in the art can also obtain other related drawings based on these drawings without creative work.

Fig. 1 is a schematic structural diagram of a device for co-processing high-salt wastewater provided by photocatalytic oxidation-electrosorption in Example 2 of the present invention;

2 is a schematic structural view of the electrosorption device provided in Example 2 of the present invention;

Fig. 3 is a schematic structural diagram of a photoelectric catalytic oxidation device provided in Example 2 of the present invention;

4 is a schematic structural diagram of the first slider provided by Embodiment 2 of the present invention;

FIG. 5 is a schematic cross-sectional structure diagram of the first installation hole provided by Embodiment 2 of the present invention.

Icons: 100-photoelectric catalytic oxidation-electro-adsorption co-processing equipment for high-salt wastewater; 101-electro-adsorption device; 110-the first electro-adsorption module; 111-the first electro-adsorption module body; 112-the first water inlet pipe; 113- The first solenoid valve; 114-the first liquid outlet pipe; 115-the second solenoid valve; 116-water production pool; 117-the first circulating pump; 118-the third solenoid valve; 119-the fourth solenoid valve; 120-water storage tank 121-acid inlet pipe; 123-fifth solenoid valve; 125-acid storage tank; 126-acid outlet pipe; 127-sixth solenoid valve; 128-acid recovery device; 129-second circulation pump; 130- 200-photoelectric catalytic oxidation device; 210-electrolyzer; 211-second water inlet pipe; 220-cover; 221-cover body; 222-opening; 223-chute; 224-first slide Block; 225-the first push rod; 226-the first slider body; 227-the second slider; 228-the second push rod; 229-the second slider body; 230-protective shell; 231-the first mounting hole ; 232-sealing ring; 233-the second outlet pipe; 240-anode electrode plate; Tail gas treatment equipment; 292-aeration device; 293-solid-liquid separation equipment; 294-liquid outlet.

detailed description

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

Example 1

A method for co-processing high-salt wastewater by photoelectric catalytic oxidation and electro-adsorption. First, the high-salt wastewater is charged into the electrolytic cell, and the cathode electrode plate and the anode electrode plate are contacted with the high-salt wastewater. The anode electrode plates move closer or farther away from each other.

Since the concentration of pollutants and ions gradually decreases during the photocatalytic process and cannot be diffused in time, the efficiency of photocatalytic oxidation will be significantly reduced. Therefore, it is preferable to complete a cathode electrode plate and an anode electrode plate close to each other and then move away from each other at intervals of 10-20 minutes. The cycle, that is, after the reaction is carried out for 10-20min, for example, after the reaction is carried out for 10min, 12min, 15min or 20min, a period in which the cathode electrode plate and the anode electrode plate are close to each other and then separated from each other is completed, that is, the cathode electrode plate and the anode electrode plate are given A certain photocatalytic reaction time of the anode electrode plate, and by moving the position between the cathode electrode plate and the anode electrode plate, the water flow is driven to fluctuate, which not only makes the pollutants diffuse, eliminates or reduces the "concentration polarization" phenomenon, but also makes the photocatalyst Diffusion, and increase the amount of dissolved oxygen, improve the efficiency of photocatalytic oxidation.

Specifically, each cycle includes a cathode electrode plate and an anode electrode plate approaching to the nearest point and a cathode electrode plate and the anode electrode plate moving away from each other to the farthest point, each time the cathode electrode plate and the anode electrode plate approaching to the nearest point Afterwards, at an interval of 5-10min, such as at intervals of 5min, 6min, 7.5min or 10min, allow it to react, and then control the relative movement of the cathode electrode plate and the anode electrode plate so that the two are far away from each other to the farthest point, as described here The closest point refers to the position where the cathode electrode plate and the anode electrode plate are located when the distance between the cathode electrode plate and the anode electrode plate is the smallest. Preferably, the minimum distance between the cathode electrode plate and the anode electrode plate is greater than 1 cm. The farthest point mentioned here refers to the position where the cathode electrode plate and the anode electrode plate are located when the distance between them is the largest. More preferably, the time for the cathode electrode plate and the anode electrode plate to move from the farthest point away from each other to the closest point close to each other is 1-2 minutes, effectively driving the water flow.

Specifically, after the photocatalytic oxidation is completed, the high-salt wastewater after the photocatalytic oxidation is discharged into the electro-adsorption device, and the electro-adsorption is performed to remove impurities such as salt ions.

Preferably, the electro-adsorption device is provided with a first electro-adsorption module and a second electro-adsorption module that can operate independently, and the first electro-adsorption module and the second electro-adsorption module alternately perform electro-adsorption treatment and regeneration treatment of high-salt wastewater, Maintain the stability of electro-adsorption treatment of high-salt wastewater.

Specifically, the regeneration treatment is carried out in the following manner: washing with high-salt wastewater after photocatalytic oxidation, electro-adsorption product water, and acid solution in sequence; wherein, the electro-adsorption product water is high-salt wastewater after electro-adsorption treatment, specifically, When the first electro-adsorption module is performing regeneration treatment, the water produced by electro-adsorption comes from the water obtained after the second electro-adsorption module undergoes electro-adsorption treatment. When the second electro-adsorption module is performing regeneration treatment, the water produced by electro-adsorption comes from the water obtained after the first electro-adsorption module undergoes electro-adsorption treatment.

When performing regeneration treatment, it is preferable to power off the first electrosorption module or the second electrosorption module, and then stand still for 20-50 minutes, such as 20 minutes, 30 minutes, 40 minutes or 50 minutes, so that the first electrosorption module or the second electrosorption module The charged particles enriched on the electrode surface of the module facilitate shedding.

Preferably, the acid solution is industrial hydrochloric acid and phosphoric acid with a mass ratio of 2-5:1, for example, the acid solution is industrial hydrochloric acid and phosphoric acid with a mass ratio of 2:1 or 5:1 or 4:1, which has a good descaling effect , and some hydrogen ions will remain in the first electrosorption module or the second electrosorption module. When electrification is carried out, the alkaline high-salt wastewater will be neutralized and exchanged will remain in the first electrosorption module or the second electrosorption module. Part of the ion on.

Preferably, the regenerated acid solution is recovered and recycled after removal of impurities, so as to save acid solution and cost.

Preferably, in the regeneration treatment, the electro-adsorption produced water is used for continuous washing twice to make the washing more clean.

Example 2

Please refer to FIG. 1 and FIG. 3 , the present invention provides a device 100 for cooperating with the above-mentioned method of photocatalytic oxidation-electrosorption co-treatment of high-salt wastewater for co-treatment of high-salt wastewater, specifically, photoelectric The equipment 100 for catalytic oxidation-electro-adsorption co-processing includes a power source 260 , an electro-adsorption device 101 , a photoelectric catalytic oxidation device 200 and a control system (not shown in the figure). The control system is electrically connected to the power source 260 .

Please refer to FIG. 2 , the electrosorption device 101 includes a first electrosorption module 110 , an acid storage tank 125 , a water storage tank 120 , a timer (not shown), a power mechanism (not shown) and a second electrosorption module 130 .

Please continue to refer to FIG. 2 , the first electrosorption module 110 includes a first electrosorption module body 111 , a first water inlet pipe 112 communicating with the first electrosorption module body 111 , an acid inlet pipe 121 , an acid outlet pipe 126 and a first electrosorption module body 111 . Liquid outlet pipe 114.

Specifically, the first electro-adsorption module body 111 is electrically connected to the control system. Since electro-adsorption uses the action of an electric field force to adsorb anions and cations to different electrode surfaces to form an electric double layer, that is, to dissolve salts and Other charged substances are enriched and concentrated on the surface of the electrode to purify water. Therefore, the control system controls the first electrosorption module 110 to stop power supply, so that the salts and other charged substances accumulated on the surface of the electrode can be separated from the surface of the electrode. Specifically, the power supply 260 described here is a low-voltage direct current power supply, so as to make the ions move in a directional manner, and the magnitude of the current can be adjusted according to the actual situation.

The first electrosorption module body 111 has a channel structure (not shown). Preferably, the width of the channel is 2-5mm, which is convenient for adsorbing ions and charged particles in the wastewater. More preferably, the work of the first electrosorption module body 111 The voltage is 1.4-1.8V, the electric double layer thickness of the first electrosorption module body 111 is 1-100nm, the electric field strength is 105-108V/m, and the electrosorption effect is good.

The first water inlet pipe 112 communicates with the photoelectric catalytic oxidation device 200 through the first solenoid valve 113, and the wastewater treated by the photoelectric catalytic oxidation device 200 enters the first electrosorption module body 111 for electrosorption.

The first liquid outlet pipe 114 is connected to the water production pool 116 through the second solenoid valve 115, that is, the water treated by the first electrosorption module body 111 enters the water production pool 116. Preferably, the first liquid outlet pipe 114 passes through the first circulating pump 117 communicates with the water production pool 116 and is used to flush the first electrosorption module body 111 to regenerate it.

The first outlet pipe 114 is connected to a drainage pool (not shown) through the third electromagnetic valve 118, that is, when the first electrosorption module body 111 is being regenerated, the high-salt wastewater treated by the photoelectric catalytic oxidation device 200 is used for the second An electro-adsorption module body 111 is flushed and then output to the drainage tank for subsequent operations.

The first liquid outlet pipe 114 is connected to the water storage tank 120 through the fourth solenoid valve 119, and when the first electrosorption module body 111 is recovered for regeneration treatment, the electrosorption produced water after flushing the first electrosorption module body 111 is preferably , the water storage tank 120 communicates with the first liquid outlet pipe 114 through a water pump (not shown). In other embodiments of the present invention, the water in the water storage tank 120 can be used as a flushing liquid during regeneration, saving water resources.

The acid inlet pipe 121 is connected to the acid liquid storage tank 125 through the fifth solenoid valve 123, and is used for descaling the first electrosorption module body 111 when it is undergoing regeneration treatment, so as to enhance the electrosorption effect after regeneration. The fifth solenoid valve 123 is electrically connected with the control system.

The acid outlet pipe 126 communicates with the acid liquid recovery device 128 through the sixth solenoid valve 127, and the sixth solenoid valve 127 is electrically connected with the control system. Preferably, the acid liquid recovery device 128 communicates with the acid liquid storage tank 125 through the second circulation pump 129 , that is, the acid recovery device 128 continues to output the treated acid to the acid storage tank 125, and the second circulation pump 129 is electrically connected to the control system to control the addition of acid to improve the treatment efficiency.

The second electrosorption module 130 has the same structure as the first electrosorption module 110. For example, the second electrosorption module 130 also has a channel structure with a channel width of 2-5mm. Specifically, the second electrosorption module 130 is arranged symmetrically with the first electrosorption module 110 and communicates with the acid storage tank 125 , and the second electrosorption module 130 is electrically connected to the control system.

Preferably, the second electro-adsorption module 130 and the first electro-adsorption module 110 are controlled by the control system, and can work at the same time, and can also work alternately. Preferably, the second electro-adsorption module 130 and the first electro-adsorption module 110 work alternately For electro-adsorption treatment and regeneration treatment of high-salt wastewater, for example, the second electro-adsorption module 130 performs adsorption treatment of wastewater, and the first electro-adsorption module 110 performs regeneration treatment, so as to ensure the stability of the electro-adsorption device 101 .

Therefore, the water produced by electrosorption is the water obtained after the second electrosorption module 130 undergoes electrosorption treatment when the first electrosorption module body 111 undergoes regeneration treatment, or when the second electrosorption module 130 performs regeneration treatment, the first The water obtained after electrosorption treatment is performed on the electrosorption module body 111 .

The photoelectric catalytic oxidation device 200 is provided with an electrolytic cell 210, and an air inlet (not shown) communicated with the electrolytic cell 210, a second water inlet pipe 211 and a second water outlet pipe 233, wherein the second water inlet pipe 211 and the second water outlet pipe 233 are connected with valves (not shown) to control the water flow.

Referring to FIG. 3 , the photoelectric catalytic oxidation device 200 includes a cover 220 , an anode electrode plate 240 , a cathode electrode plate 250 , an ultraviolet lamp 280 , a power supply 260 , a photocatalyst 270 and an air pump 290 .

Specifically, the cover 220 includes a cover body 221 , a first slider 224 , a second slider 227 and a protective shell 230 .

Wherein, the cover body 221 is detachably matched with the electrolytic tank 210 , so that it is convenient to clean the inside of the electrolytic tank 210 and replace parts in the electrolytic tank 210 . The cover body 221 is provided with an opening 222 passing through the cover body 221 , and the opening 222 is preferably a long and narrow opening. In this embodiment, the opening 222 is rectangular. The cover body 221 is provided with a timer (not shown in the figure), and the timer is electrically connected to the control system.

In this embodiment, the cover body 221 is provided with sliding slots 223 along both sides of the opening 222 along the length direction of the opening 222 , wherein the first sliding block 224 and the second sliding block 227 are slidably embedded in the sliding slots 223 .

Specifically, please refer to FIG. 4 , the first slider 224 includes a first push rod 225 and a first slider body 226 connected to each other, and the first push rod 225 is pushed by an external force to drive the first slider body 226 along the length of the opening 222 Direction slide. Preferably, the length of the first push rod 225 along the width direction of the opening 222 is smaller than the width direction of the opening 222 , that is, there is a gap between the first push rod 225 and the opening 222 , so that waste gas generated by degradation can overflow from the electrolytic cell 210 . Specifically, in this embodiment, the first slider body 226 is a cuboid structure. The first push rod 225 is in transmission connection with the power mechanism, and the power mechanism is electrically connected with the control system for controlling the movement of the first push rod 225 .

Wherein, the second slider 227 is arranged symmetrically with the first slider 224, and the structure of the second slider 227 is the same as that of the first slider 224, that is, the second slider 227 includes a second push rod 228 connected to each other, The second slider body 229, the second push rod 228 are connected to the power mechanism through transmission, etc., which will not be described in detail here.

The protective shell 230 covers the upper end of the opening 222 for preventing the gas from directly overflowing into the air pollution environment. Preferably, the protective shell 230 is provided with a through hole (not shown in the figure), a first installation hole 231 matched with the first push rod 225 , and a second installation hole (not shown in the figure) matched with the second push rod 228 .

Please refer to FIG. 4 and FIG. 5 together. Steps are provided at both ends of the first installation hole 231 along its axial direction, and a sealing ring 232 is provided at the steps to prevent exhaust gas from passing through the first installation hole 231 and the first push rod 225. The gap overflows and pollutes the environment. The structure of the second installation hole is the same as that of the first installation hole 231 , and the sealing ring 232 is also installed, which will not be repeated here.

The anode electrode plate 240 is arranged in the electrolytic cell 210 and is connected with the center of the first slider body, so that the anode electrode plate 240 is driven to slide when the first slider 224 slides. In this embodiment, the anode electrode plate 240 and the cathode electrode plate 250 are arranged side by side and move along the direction perpendicular to the anode electrode plate.

The anode electrode plate 240 is a net-shaped noble metal anode plate prepared by immobilizing tin-iridium oxides and noble metals on the surface of the titanium substrate. The noble metal material is at least one of platinum, ruthenium, rubidium and zirconium. In this embodiment, preferably The anode electrode plate 240 is a net-shaped noble metal anode plate prepared by immobilizing tin-iridium oxides and noble metal zirconium on the surface of the titanium substrate, and has high photocatalytic activity and good effect.

The cathode electrode plate 250 is arranged in the electrolytic cell 210 and is connected with the center of the second slider body, so that the cathode electrode plate 250 is driven to slide when the second slider 227 slides, and when the first slider body and the second slider body interact with each other When conflicting, there is a gap between the cathode electrode plate 250 and the anode electrode plate 240, preventing the cathode electrode plate 250 from being too close to the anode electrode plate 240 and causing the capacitance between the two to be too high and breakdown the cathode electrode plate 250 and the anode electrode plate 240 , resulting in increased maintenance costs; moreover, when the distance between the cathode electrode plate 250 and the anode electrode plate 240 is too short, the photocatalyst 270 is not easily distributed between them.

The material of the cathode electrode plate 250 can be titanium, stainless steel, activated carbon fiber, porous graphite, etc., preferably titanium in this embodiment, which will generate gas-liquid two-phase flow on the surface when catalytic electrolysis occurs, increasing the degree of surface turbulence , slow down the tendency of its surface fouling, prolong the use time. In this embodiment, the cathode electrode plate 250 and the anode electrode plate 240 are arranged side by side and move along a direction perpendicular to the cathode electrode plate 250 .

Preferably, the end of the anode electrode plate 240 away from the electrolytic tank 210 and the end of the cathode electrode plate 250 away from the electrolytic tank 210 are both electrically connected to the power supply 260 through the wire 241 passing through the through hole.

During the reaction process, due to the continuous degradation of the pollutants, the concentration becomes low and cannot be diffused in time, which will cause a significant drop in photocatalytic oxidation efficiency. Therefore, it is preferable to make the cathode electrode plate 250 and the anode electrode plate 240 close to or away from each other every 10-20min. , by moving the position between the anode electrode plate 240 and the cathode electrode plate 250, the water flow is driven to fluctuate, which not only diffuses the pollutants, eliminates or reduces the "concentration polarization" phenomenon, but also diffuses the photocatalyst 270 and increases dissolved oxygen to increase the efficiency of photocatalytic oxidation. In other embodiments of the present invention, for different types of high-salt wastewater, the distance between the anode electrode plate 240 and the cathode electrode plate 250 can be adjusted according to the actual situation before the reaction starts, and high The treatment of salt wastewater improves the efficiency of photocatalytic oxidation.

The photocatalyst 270 uses porous aluminum oxide or porous silica as a carrier, and the surface is loaded with at least one active material in titanium dioxide and zirconium dioxide. The photocatalyst effect is good. Preferably, the particle size of the photocatalyst 270 is 1- 9cm, easy to separate on the basis of better catalytic efficiency.

The ultraviolet lamp 280 is set in the electrolytic cell 210 on the side of the anode electrode plate 240 away from the cathode electrode plate 250, and is used to cooperate with the photocatalyst 270, the anode electrode plate 240, and the cathode electrode plate 250 to form a photocatalytic system to effectively degrade high-salt wastewater organic matter within. The ultraviolet lamp 280 is electrically connected to the power source 260 .

The air pump 290 communicates with the gas outlet and is used to extract the waste gas generated by the electrolytic cell 210 . Preferably, the end of the air pump 290 away from the gas outlet is connected with a tail gas treatment device 291 .

The air inlet is connected with an aeration device 292. Preferably, the aeration device 292 uses oxygen, air or ozone as an aeration medium to increase the oxygen content in the wastewater, improve the photoelectric catalytic oxidation efficiency, and effectively degrade organic matter.

The second water outlet pipe 233 communicates with a solid-liquid separation device 293 , and the solid-liquid separation device 293 has a liquid outlet 294 , and the liquid outlet 294 communicates with the first water inlet pipe 112 .

The method for treating wastewater by utilizing the above-mentioned equipment 100 for co-processing high-salt wastewater by photocatalytic oxidation-electro-adsorption, firstly, the high-salt wastewater enters the electrolytic cell 210 through the second water inlet pipe 211, and the cathode electrode plate 250 and the anode electrode plate 240 are combined with the After contact with high-salt wastewater, photoelectric catalytic oxidation is carried out after power-on, and the aeration device 292 continuously compresses air and inputs it into the electrolytic cell 210. During the reaction, each time the cathode electrode plate 250 and the anode electrode plate 240 approach each other to the nearest point after 1 minute, After an interval of 9 minutes, the relative movement of the cathode electrode plate 250 and the anode electrode plate 240 is controlled for 1 minute so that the two are far away from each other to the farthest point, and the next cycle is performed at an interval of 9 minutes, that is, a cathode electrode plate 250 and anode electrode plate 240 are completed every 20 minutes. The anode electrode plates 240 are close to each other and then far away from each other, so as to promote the efficiency of the photoelectric catalytic reaction. The exhaust gas generated during the reaction is pumped through the air pump 290 and input to the exhaust gas treatment equipment 291 for treatment. After the reaction is completed, it will be treated by photoelectric catalytic oxidation. The final high-salt wastewater is discharged into the electrosorption device 101 through the liquid outlet 294 of the solid-liquid separation device 293 .

Then, the wastewater treated by photoelectric catalytic oxidation is discharged into the second electrosorption module 130 through the liquid outlet 294 of the solid-liquid separation device 293 for electrosorption, and the high-salt water after the electrosorption of the second electrosorption module 130 is completed The waste water, ie the electro-adsorption product water, is discharged into the product water tank 116 .

At the same time, the control system turns off the power supply 260 of the first electro-adsorption module body 111, and stands still for 40 minutes, so that the charged particles enriched on the electrode surface of the first electro-adsorption module body 111 are easy to fall off. The first electro-adsorption module body 111 is washed with electro-adsorption produced water and the acid solution mixed with industrial hydrochloric acid and phosphoric acid with a mass ratio of 3:1, wherein, the electro-adsorption produced water is used for washing twice, and at the same time, the drainage pool, The water storage tank 120 and the acid recovery device 128 sequentially recover the high-salt wastewater after photocatalytic oxidation, the electro-adsorption product water and the acid solution after flushing the first electro-adsorption module body 111 . After the first electrosorption module 110 completes the regeneration treatment, it is powered on to start the electrosorption treatment. At the same time, the second electrosorption module 130 is powered off to perform the regeneration treatment. The two alternately perform the electrosorption treatment and regeneration treatment of the high-salt wastewater. Maintain the stability of high-salt wastewater treatment.

In summary, the photoelectrocatalytic oxidation-electrosorption co-processing equipment 100 for high-salt wastewater provided by the preferred embodiment of the present invention is easy to operate, effectively saves water, and can effectively promote the efficiency of photocatalytic oxidation and electrosorption regeneration.

The embodiments described above are some, not all, embodiments of the present invention. The detailed description of the embodiments of the invention is not intended to limit the scope of the claimed invention but to represent only selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Claims (10)

1. A method for photoelectric catalytic oxidation-electric adsorption co-processing of high-salt wastewater, characterized in that, the high-salt wastewater is charged into the electrolytic cell, the cathode electrode plate and the anode electrode plate are contacted with the high-salt wastewater, and after electrification, Make the cathode electrode plate and the anode electrode plate close to or away from each other, and after the photoelectrocatalytic oxidation is completed, discharge the high-salt wastewater after the photoelectrocatalytic oxidation into the electrosorption device; The first electro-adsorption module and the second electro-adsorption module which can operate independently are arranged in the electro-adsorption device, and the first electro-adsorption module and the second electro-adsorption module alternately perform electro-adsorption on the high-salt wastewater Treatment and regeneration treatment, the regeneration treatment is carried out in the following way: sequentially wash with high-salt wastewater after photoelectric catalytic oxidation, electro-adsorption produced water and acid solution; The electro-adsorption produced water is high-salt wastewater after electro-adsorption treatment. 2 . The method according to claim 1 , wherein, when the first electrosorption module undergoes regeneration treatment, the electrosorption produced water comes from the water obtained after the second electrosorption module undergoes electrosorption treatment. 3 . 3. The method according to claim 1, characterized in that, when the second electrosorption module is performing regeneration treatment, the electrosorption produced water comes from the water obtained after the first electrosorption module undergoes electrosorption treatment. 4. The method according to claim 1, characterized in that the acid solution is industrial hydrochloric acid and phosphoric acid with a mass ratio of 2-5:1. 5 . The method according to claim 1 , characterized in that, when the reaction is in progress, a period in which the cathode electrode plate and the anode electrode plate approach each other and then move away from each other is completed every 10-20 minutes. 6. The method according to claim 5, characterized in that, each time after the cathode electrode plate and the anode electrode plate approach each other to the closest point, control the cathode electrode plate and the anode electrode plate at an interval of 5-10min The electrode plates move relative to each other to make the two away from each other to the farthest point. 7 . The method according to claim 6 , wherein the time for the cathode electrode plate and the anode electrode plate to move from the farthest point away from each other to the closest point close to each other is 1-2 minutes. 8. The method according to claim 1, further comprising recovering the regenerated acid solution and recycling it after removing impurities. 9. The method according to claim 1, characterized in that, in the regeneration treatment, the electro-adsorption produced water is used for continuous washing twice. 10. A device for co-processing photoelectric catalytic oxidation-electro-adsorption of high-salt wastewater, including a power supply, a photoelectric catalytic oxidation device electrically connected to the power supply, an electro-adsorption device, and a control system, and the photoelectric catalytic oxidation device is set up There is an electrolytic cell, and an anode electrode plate, a cathode electrode plate, and an ultraviolet lamp electrically connected to the power supply are arranged in the electrolytic cell, and it is characterized in that the photoelectric catalytic oxidation device is provided with an opening, and the photoelectric catalytic oxidation device includes Slide the first slider and the second slider embedded in the opening, the first slider and the second slider are respectively connected with the anode electrode plate and the cathode electrode plate and drive the anode The electrode plate and the cathode electrode plate slide along the extension direction of the opening so that the cathode electrode plate and the anode electrode plate approach or move away from each other, and the first slider and the second slider are both driven There is a power mechanism, the power mechanism is electrically connected to the control system, and the electrolytic cell is filled with a photoelectric catalyst; The electro-adsorption device includes a first electro-adsorption module, a second electro-adsorption module, and an acid storage tank, and the first electro-adsorption module and the second electro-adsorption module are respectively connected to the electrolytic cell, the water production pool, and the acid storage tank. are respectively communicated through valves, and the control system is electrically connected with the valves.