CN106745542A - The photoelectrocatalysis processing system and method for high-salt wastewater - Google Patents

Abstract

The invention relates to a photoelectric catalytic treatment system and method for high-salt wastewater, and relates to the technical field of wastewater treatment. The photoelectrocatalytic treatment system includes photocatalytic treatment equipment. The photocatalytic treatment equipment is equipped with an electrolytic cell, and an anode electrode plate and a cathode electrode plate are arranged at intervals in the electrolytic cell. The body includes a protective shell, and a first slider and a second slider that are slidably embedded in the opening. The first slider and the second slider are respectively connected to the anode electrode plate and the cathode electrode plate. The electrode plate and the cathode electrode plate are respectively electrically connected to a power source, the electrolytic cell is filled with a photocatalyst, and the electrolytic cell is equipped with a plurality of ultraviolet lamps, which can strengthen the system's ability to remove pollutants and resist pollution. The present invention also proposes a photoelectric catalytic treatment method for high-salt wastewater. The high-salt wastewater is treated by the photoelectric catalytic treatment system, so that the high-salt wastewater quickly reaches the qualified discharge standard.

Description

Photoelectric catalytic treatment system and method for high-salt wastewater

technical field

The invention relates to the technical field of wastewater treatment, and in particular to a photoelectric catalytic treatment system and method for high-salt wastewater.

Background technique

With the continuous improvement of my country's industrialization level, industrial water consumption continues to increase, industrial production processes such as petroleum refining, chemical product production, etc. produce a large amount of industrial wastewater, which often contains a large amount of artificially synthesized refractory organic pollutants such as benzene, biphenyl Such substances generally have the characteristics of stable structure, high toxicity, and long biodegradation cycle. Once discharged into water bodies, they will cause serious pollution to the surface water environment. 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 ability is low, and it is impossible to effectively adjust the reaction rate of radio and television catalysis. The photoelectrocatalytic oxidation system is prone to "concentration polarization", especially when the concentration of pollutant substrate is low, the pollutants cannot diffuse in time, resulting in a significant drop in photocatalytic oxidation efficiency. , the energy consumption increases, and the treatment cost increases; the anti-pollution of the polar plate is poor, and the surface of the polar plate is easy to scale. .

Contents of the invention

The purpose of the present invention is to provide a photoelectric catalytic treatment system for high-salt wastewater, realize the organic combination of the photocatalytic system and the electrocatalytic oxidation system, effectively adjust and improve the photoelectric catalytic oxidation efficiency, and strengthen the system's pollutant removal ability and anti-pollution ability. At the same time, the service life of the electrode plate is extended.

Another object of the present invention is to provide a photoelectrocatalytic treatment method for high-salt wastewater, which can effectively degrade organic matter in high-salt wastewater, so that high-salt wastewater can quickly reach the qualified discharge standard.

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

The invention proposes a photoelectric catalytic treatment system for high-salt wastewater, which includes photoelectric catalytic treatment equipment. The photoelectric catalytic treatment equipment is provided with a water inlet and a water outlet, and the photoelectric catalytic treatment equipment is connected with an aeration device.

Among them, the photoelectric catalytic treatment equipment is equipped with an electrolytic cell, and an anode electrode plate and a negative electrode plate are arranged at intervals in the electrolytic cell. A protective case covering the opening, and a first slider and a second slider slidingly embedded in the opening. The first slider and the second slider are respectively connected to the anode electrode plate and the cathode electrode plate to drive the anode electrode plate and the cathode electrode plate The electrode plate slides along the extension direction of the opening, the protective shell is connected with an air pump, the anode electrode plate and the cathode electrode plate are electrically connected to a power supply through the protective shell, and the electrolytic cell is filled with a photocatalyst, and the electrolytic cell is located at the anode electrode plate away from the cathode electrode Multiple UV lamps are provided on one side of the plate.

The invention proposes a photoelectric catalytic treatment method for high-salt wastewater, in which the high-salt wastewater is treated by the above-mentioned photoelectric catalytic treatment system.

The beneficial effect of the photocatalytic treatment system and method for high-salt wastewater provided by the preferred embodiment of the present invention is: by adjusting the distance between the anode electrode plate, the cathode electrode plate and the ultraviolet lamp tube, the photocatalytic reaction efficiency can be effectively regulated, By adjusting the distance between the cathode electrode plate and the anode electrode plate, the water flow is stirred, which effectively promotes the oxygen content in the wastewater and promotes the photoelectric catalytic reaction efficiency. Timely diffusion of substances can enhance the efficiency of electrocatalytic oxidation, and due to the gas-liquid two-phase flow on the surface of the cathode electrode plate and photocatalyst produced by catalytic electrolysis, the degree of turbulence on the surface of the two is increased, the tendency of fouling on the surface of the two is slowed down, and the service life is extended. time.

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 the structural representation of the photocatalytic treatment system of the high-salt wastewater provided by the first embodiment of the present invention;

Fig. 2 is a schematic structural view of the photocatalytic treatment device provided by the first embodiment of the present invention;

3 is a schematic structural diagram of a first slider provided in the first embodiment of the present invention;

Fig. 4 is a schematic cross-sectional structure diagram of the first installation hole provided by the first embodiment of the present invention.

Icons: 100-photocatalytic treatment system for high-salt wastewater; 200-photocatalytic treatment equipment; 210-electrolyzer; 211-water inlet; 220-cover; 221-cover body; 222-opening; 223-chute; 224-the first slider; 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 installation hole; 232-sealing ring; 240-anode electrode plate; 241-wire; 250-cathode electrode plate; 260-power supply; 270-photoelectric catalyst; 280-ultraviolet lamp; Equipment; 400-aeration device; 500-solid-liquid separation equipment; 510-sewage outlet; 520-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.

Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents 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.

It should be noted that like numerals and letters denote similar items in the following figures, therefore, once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "inner" and so on is based on the orientation or positional relationship shown in the drawings, or the conventionally placed position when the product of the invention is used. Orientation or positional relationship is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention. In addition, the terms "first", "second", etc. are only used for distinguishing descriptions, and should not be construed as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "setting", "installation" and "connection" should be interpreted in a broad sense, for example, it can be a fixed connection or an optional connection. Detachable connection, or integral connection; it can be mechanical connection or electrical connection; it can be direct connection or indirect connection through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

first embodiment

Please refer to FIG. 1 , this embodiment provides a photocatalytic treatment system 100 for high-salt wastewater, including a photocatalytic treatment device 200 , an aeration device 400 and a solid-liquid separation device 500 .

Please refer to Fig. 2, photoelectrocatalytic processing equipment 200 is provided with electrolyzer 210, and the air inlet (not shown) that communicates with electrolyzer 210, water inlet 211 and drain (not shown), wherein water inlet 211 and drain The ports are connected with valves to control the water flow.

The photoelectrocatalytic treatment device 200 includes a cover body 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 defines an opening 222 passing through the cover body 221 , and the opening 222 is preferably a narrow and long opening 222 .

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. 3 , 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 .

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, a first The second slider body 229 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. 3 and FIG. 4 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 to the center of the first slider body, so that the anode electrode plate 240 is driven to slide when the first slider 224 slides. The extension direction of the electrode plate 240 moves.

The anode electrode plate 240 is a net-shaped noble metal anode electrode plate prepared by immobilizing tin-iridium oxides and noble metals on the surface of the titanium substrate. The noble metal substance 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 electrode plate prepared by immobilizing tin-iridium oxide and noble metal zirconium on the surface of the titanium substrate, which 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 moves along a direction perpendicular to the extension direction of 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 electrically connected to the power supply 260 through a wire 241 passed through the through hole. Preferably, the wire 241 is in a spiral shape. Therefore, the distance change caused by the relative sliding of the anode electrode plate 240 and the cathode electrode plate 250 can be satisfied on the basis of constant line length, and the production cost can be saved.

The cathode electrode plate 250 and the anode electrode plate 240 are electrically connected to the power supply 260. Specifically, the power supply 260 is a low-voltage DC power supply, so that the ions move in a directional manner, and the current can be adjusted according to actual conditions. Moreover, the high-salt wastewater can effectively reduce the cell voltage, reduce power consumption, reduce energy consumption, and effectively precipitate Ca ²⁺ , Mg ²⁺ and the like in the high-salt wastewater.

During the reaction process, due to the continuous degradation of pollutants, the concentration becomes low and cannot be diffused in time, which will cause a significant drop in photocatalytic oxidation efficiency. By moving the position between the anode electrode plate 240 and the cathode electrode plate 250, the water flow is driven to fluctuate, even if the pollution Diffusion of substances, eliminate or reduce the "concentration polarization" phenomenon, also make the photocatalyst 270 diffuse, and increase the amount of dissolved oxygen, improve the efficiency of photocatalytic oxidation. 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 the high-salt wastewater can be treated within the optimal cell voltage range to improve catalytic oxidation. efficiency.

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 for extracting 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 300 .

The aeration device 400 communicates with the air inlet. Preferably, the aeration device 400 uses oxygen, air or ozone as an aeration medium to increase the oxygen content in the wastewater, improve the efficiency of photocatalytic oxidation, and effectively degrade organic matter.

The solid-liquid separation device 500 is connected to the drain port, and has a sewage discharge port 510 and a liquid outlet 520, wherein the liquid obtained after the photoelectric catalytic reaction flows out through the liquid outlet 520 and enters the next-level wastewater treatment system, while the solid produced by degradation The sediment is discharged through the sewage outlet 510.

The present invention also provides a photoelectrocatalytic treatment method for the high-salt wastewater treated by the above-mentioned photoelectric catalytic treatment system. Specifically, the high-salt wastewater enters the electrolytic cell 210 through the water inlet 211, and the power supply 260 is turned on to perform photoelectric catalytic oxidation. During this period, the aeration device 400 continuously compresses air and inputs it into the electrolytic cell 210, and can also adjust the distance between the cathode electrode plate 250, the anode electrode plate 240, and the ultraviolet lamp 280, adjust the photoelectric catalytic oxidation process, and simultaneously drive high The flow of salty wastewater increases the amount of dissolved oxygen and avoids the phenomenon of "concentration polarization". During the reaction, the waste gas produced is pumped through the air pump 290 and input to the tail gas treatment equipment 300 for treatment. After the reaction is completed, the generated solid precipitation is discharged through the sewage outlet 510 of the solid-liquid separation equipment 500, and the waste water after photoelectric catalytic oxidation treatment Output through the liquid outlet 520 of the solid-liquid separation device 500.

In summary, the photocatalytic treatment system and method for high-salt wastewater provided by the preferred embodiments of the present invention are convenient to operate, consume less energy, can effectively promote photocatalytic oxidation efficiency, and save costs.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. a kind of photoelectrocatalysis processing system of high-salt wastewater, including photoelectrocatalysis processing equipment, the photoelectrocatalysis treatment sets Standby to offer water inlet and delivery port, the photoelectrocatalysis processing equipment is communicated with aerator, it is characterised in that the photoelectricity Catalytic treatment equipment offers electrolytic cell, and anode electrode plate and cathode electrode plate, the light are arranged at intervals with the electrolytic cell Electro-catalysis processing equipment includes the lid detachably coordinated with the electrolytic cell, and the lid offers opening, the lid bag Include and cover in the containment vessel of the opening, and slide the first sliding block and the second sliding block for being embedded at the opening, described first Sliding block, second sliding block be connected with the anode electrode plate, the cathode electrode plate and drive the anode electrode plate respectively, The cathode electrode plate is slided along the bearing of trend of the opening, and the containment vessel is communicated with aspiration pump, the anode electrode plate The containment vessel is each passed through with the cathode electrode plate to be electrically connected with filled with photoelectric in power supply, the electrolytic cell, The electrolytic cell is provided with multiple uviol lamps positioned at the anode electrode plate away from the side of the cathode electrode plate.

2. photoelectrocatalysis processing system according to claim 1, it is characterised in that first sliding block includes being connected with each other The first push rod and the first slider body, first slider body is connected with the anode electrode plate, and the containment vessel is opened up There is the first mounting hole coordinated with first push rod.

3. photoelectrocatalysis processing system according to claim 2, it is characterised in that first mounting hole is along its axial direction Two ends are provided with step, and sealing ring is provided with the step.

4. photoelectrocatalysis processing system according to claim 1, it is characterised in that the lid along the opening length Direction is provided with chute, and first sliding block is slided and is embedded at the chute respectively with second sliding block.

5. photoelectrocatalysis processing system according to claim 1, it is characterised in that the anode electrode plate is along perpendicular to institute State the bearing of trend motion of anode electrode plate.

6. photoelectrocatalysis processing system according to claim 1, it is characterised in that the photoelectric is with porous three oxygen It is carrier to change two aluminium or porous silica, and area load has at least one active material in titanium dioxide, zirconium dioxide.

7. photoelectrocatalysis processing system according to claim 1, it is characterised in that the anode electrode plate is titanium-based material table The netlike noble metal anode electrode plate that the immobilized tin iridium series oxide in face and noble metal are prepared from, the precious metals species are At least one in platinum, ruthenium, rubidium and zirconium, the cathode electrode plate is Ti cathode battery lead plate.

8. photoelectrocatalysis processing system according to claim 1, it is characterised in that the aerator uses oxygen, sky Gas or ozone are used as aeration medium.

9. photoelectrocatalysis processing system according to claim 1, it is characterised in that the delivery port is communicated with separation of solid and liquid Equipment, the solid-liquid separating equipment has sewage draining exit and liquid outlet.

10. the photoelectrocatalysis processing method of a kind of high-salt wastewater, it is characterised in that high-salt wastewater is any through claim 1-9 Photoelectrocatalysis processing system treatment described in.