Electrochemical and ozone coupling reaction device for zero-emission high-salt degradation-resistant wastewater in coal chemical industry

Abstract

The utility model relates to an electrochemical and ozone coupling reaction device for zero-emission high-salt degradation-resistant wastewater in the coal chemical industry. The electrochemical and ozone coupling reaction device comprises a reaction tank, an electro-catalysis group, an ozone generator and a tail gas treatment group. High-salt sewage enters the reaction tank from a water distribution system at the bottom of the reaction tank through a water inlet of the reaction tank, ozone generated by the ozone generator enters the reaction tank from a gas distribution system at the bottom of the reaction tank through a gas inlet of the reaction tank, and pollutants in the sewage are degraded and even mineralized by the ozone and the sewage in the reaction tank. The electro-catalysis group can promote production of active oxygen in the ozone decomposition process, the reaction rate of sewage in the reaction tank is increased through the dual oxidation effect of the electro-catalysis group and ozone, in addition, the gas outlet of the reaction tank is connected to the tail gas treatment group, harmful gas in tail gas can be treated and then discharged, and the environment is protected. Under the conditions of environmental protection and no reduction of the reaction effect, the reaction efficiency is improved, so that the reaction time is effectively shortened.

Description

Technical Field

[0001] The present application relates to the field of water treatment, and particularly to an electrochemical and ozone coupling reaction device for zero-discharge high-salt and difficult-to-degrade wastewater in coal chemical industry. Background Art

[0002] At present, one of the difficulties in zero-discharge salt separation of high-salt wastewater in coal chemical industry is that the concentration of organic pollutants in the inlet water of the evaporation crystallization system is relatively high, which will affect the quality of the crystalline salt, resulting in a high rate of miscellaneous salts; it is also easy to cause entrainment of mist and foam, affecting the quality of the evaporation condensate; during the evaporation and concentration process, viscous colloids may also be formed, adhering to the heat transfer surface, neither conducting heat nor being easy to crystallize, and in severe cases, it will cause the system to crash.

[0003] The ozone method is the main method for pretreatment of concentrated brine to remove organic matter at the present stage, such as ozone-activated carbon, ozone-hydrogen peroxide oxidation, ozone catalytic oxidation, etc., but the ozone method cannot simultaneously meet the requirements of improving the reaction efficiency, effectively shortening the reaction time, and reducing the operating cost under the premise of energy conservation and environmental protection. Utility Model Content

[0004] In view of this, the present application proposes an electrochemical and ozone coupling reaction device for zero-discharge high-salt and difficult-to-degrade wastewater in coal chemical industry, which can improve the reaction efficiency and effectively shorten the reaction time without reducing the reaction effect under the condition of environmental protection.

[0005] According to one aspect of the present application, there is provided an electrochemical and ozone coupling reaction device for zero-discharge high-salt and difficult-to-degrade wastewater in coal chemical industry, including: a reaction tank, an electrocatalytic group, an ozone generator, and a tail gas treatment group.

[0006] The reaction tank is a hollow box body, and a water distribution system and a gas distribution system are arranged at the bottom of the reaction tank. The water distribution system is suitable for being connected to the inlet end through a pipeline; the outlet end of the ozone generator is connected to the inlet end of the reaction tank through a pipeline, and the ozone generator is communicated with the gas distribution system; the outlet end of the reaction tank is connected to the tail gas treatment group through a pipeline; a part of the electrocatalytic group is arranged in the reaction tank, and the electrocatalytic group is suitable for reacting synergistically with ozone in the reaction tank.

[0007] In an implementable manner, the electrocatalytic group includes: a DC power supply, a cathode plate, and an anode plate. The cathode plate is electrically connected to the DC power supply, and the anode plate is electrically connected to the DC power supply; the DC power supply is arranged outside the reaction tank, and the cathode plate and the anode plate are arranged in the reaction tank.

[0008] In an implementable manner, the cathode plate and the anode plate are arranged opposite to each other, and a preset distance is provided between the cathode plate and the anode plate.

[0009] In an implementable manner, the cathode plate is disposed on the inner wall of one side of the reaction tank close to the reaction tank, the anode plate is disposed on the inner wall of the side of the reaction tank where the cathode plate is not provided, and the anode plate and the cathode plate are disposed in two opposite side walls of the reaction tank.

[0010] In an implementable manner, the cathode plate and the anode plate are equal in size and are arranged in parallel between them; the number of the cathode plates and the anode plates is multiple, and the multiple cathode plates and anode plates are arranged at intervals, and the cathode plates and the anode plates are arranged parallel to the inner wall of the reaction tank.

[0011] In an implementable manner, the cathode plate and the anode plate are the same in size, and the projected area of one side of the cathode plate and the anode plate is 1 / 4 - 3 / 4 of the area of one side of the reaction tank.

[0012] In an implementable manner, the tail gas treatment group includes: an alkali washing tower, an adsorption tank and an exhaust pipe. A pipeline is connected between the gas outlet of the reaction tank and the inlet end of the alkali washing tower, a pipeline is connected between the outlet end of the alkali washing tower and the inlet end of the adsorption tank, and the outlet end of the adsorption tank is communicated with the exhaust pipe.

[0013] In an implementable manner, the tail gas treatment group further includes a centrifugal fan. The centrifugal fan is disposed between the adsorption tank and the exhaust pipe, and a pipeline is connected between the outlet end of the adsorption tank and the centrifugal fan.

[0014] In an implementable manner, the adsorption tank is an activated carbon adsorption tank.

[0015] In an implementable manner, the reaction tank is of a cuboid structure. The water inlet and the gas inlet of the reaction tank are respectively disposed on two adjacent side walls of the reaction tank, and both the water inlet and the ozone gas inlet of the reaction tank are disposed at positions close to the bottom of the reaction tank.

[0016] Advantages of the present application: High-salt sewage enters from the bottom water distribution system of the reaction tank through the water inlet of the reaction tank, and ozone generated by the ozone generator enters from the bottom gas distribution system of the reaction tank through the gas inlet of the reaction tank. Ozone degrades and even mineralizes pollutants in the sewage in the reaction tank. An electrocatalytic group is also provided, which can promote the production of reactive oxygen species during the decomposition of ozone, thereby increasing the removal rate of sewage in the reaction tank. Through the dual oxidation of the electrocatalytic group and ozone, the reaction time is reduced. In addition, the gas outlet of the reaction tank is connected to the tail gas treatment group, which can treat harmful gases in the tail gas and then discharge them. According to a coal chemical zero-emission high-salt and difficult-to-degrade wastewater electrochemical and ozone coupling reaction device of the present application, the reaction efficiency is improved without reducing the reaction effect in an environmentally friendly manner, thereby effectively shortening the reaction time.

[0017] Other features and aspects of the present application will become clear from the following detailed description of the exemplary embodiments with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings included in and constituting a part of this specification, together with the specification, illustrate exemplary embodiments, features, and aspects of the present application and are used to explain the principles of the present application.

[0019] Figure 1 Schematic diagram of a coal chemical zero-emission high-salt and difficult-to-degrade wastewater electrochemical and ozone coupling reaction device showing an embodiment of the present application. DETAILED DESCRIPTION

[0020] Various exemplary embodiments, features, and aspects of the present application will be described in detail below with reference to the drawings. The same reference numerals in the drawings denote elements having the same or similar functions. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0021] Among them, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application or simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation on the present application.

[0022] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, "a plurality of" means two or more, unless otherwise specifically defined.

[0023] As used herein, the term "exemplary" means "serving as an example, embodiment, or illustration". Any embodiment described herein as "exemplary" should not be construed as being superior or better than other embodiments.

[0024] In addition, for a better description of this application, numerous specific details are given in the following detailed implementation manners. Those skilled in the art should understand that this application can also be implemented without some specific details. In some instances, methods, means, elements, and circuits well known to those skilled in the art are not described in detail so as to highlight the gist of this application.

[0025] As Figure 1 shown, the electrochemical and ozone coupling reaction device for zero-emission high-salt and difficult-to-degrade wastewater in coal chemical industry includes: a reaction tank 100, an electrocatalytic group, an ozone generator 300, and a tail gas treatment group.

[0026] The reaction tank 100 is a box with a hollow interior. A water distribution system and a gas distribution system are arranged at the bottom of the reaction tank 100. The water distribution system is suitable for being connected to the inlet end through a pipeline; the outlet end of the ozone generator 300 is connected to the inlet end of the reaction tank 100 through a pipeline, and the ozone generator 300 is communicated with the gas distribution system; the outlet end of the reaction tank 100 is connected to the tail gas treatment group through a pipeline; a part of the electrocatalytic group is arranged in the reaction tank 100, and the electrocatalytic group reacts synergistically with ozone in the reaction tank 100.

[0027] An electrochemical and ozone coupling reaction device for zero-emission high-salt and difficult-to-degrade wastewater in coal chemical industry according to this application is suitable for the treatment of high-salt concentrated water in zero-emission projects of coal chemical industry. Within a certain range of influent water quality, it can automatically adapt to various operating conditions.

[0028] During operation, the high-salt wastewater is pumped into the water distribution system at the bottom of the electrocatalytic reaction tank 100, and then enters the electrocatalytic reaction cell inside the reaction tank 100. At normal temperature and pressure, ·OH or other strongly oxidizing reactive intermediates such as H2O2, O3, HO2·, O2-·, Cl2, HClO, ClO-, and solvated electrons are directly or indirectly generated by the catalytically active electrodes, effectively oxidizing and decomposing the pollutants in the high-salt wastewater, and the equipment is simple and easy to operate and control. Ozone is generated by the ozone generator 300, sent to the gas distribution system at the bottom of the reaction tank 100 through the ozone pipeline, released through the high-efficiency dissolved gas device, and fully mixed with the high-salt wastewater. The high-salt wastewater mixed with ozone enters the electrocatalytic reactor. Under the action of the electric field, the generation of reactive oxygen species during the decomposition of ozone is promoted, which can significantly improve the oxidation efficiency and reaction rate. Through the dual oxidation of the electrode and ozone, the treatment efficiency of the device can be effectively improved, the reaction time can be shortened, and the equipment investment and operation cost can be reduced.

[0029] Furthermore, a control system is also provided to control the overall operation of the device. The control system is a technology that can be achieved by existing technologies. By detecting the concentrations of influent COD, ammonia nitrogen, TDS, chloride ions, etc., and the concentrations of effluent COD and ammonia nitrogen, and interlocking with the electrocatalytic and ozone generator 300, the current density of the electrocatalytic reactor and the ozone dosage are adjusted to ensure that the effluent water quality meets the standards stably within a certain range of influent water quality fluctuations.

[0030] In an achievable manner, the electrocatalytic group includes: a DC power supply 210, a cathode plate 220, and an anode plate 230. The cathode plate 220 is electrically connected to the DC power supply 210, and the anode plate 230 is electrically connected to the DC power supply 210; the DC power supply 210 is arranged outside the reaction tank 100, and the cathode plate 220 and the anode plate 230 are arranged inside the reaction tank 100.

[0031] In an achievable manner, the cathode plate 220 and the anode plate 230 are arranged oppositely, and there is a preset distance between the cathode plate 220 and the anode plate 230 for accelerating the reaction of ozone and the substances to be treated in the sewage between the cathode plate 220 and the anode plate 230.

[0032] In an achievable manner, the cathode plate 220 is arranged close to the inner wall of one side of the reaction tank 100, the anode plate 230 is arranged close to the inner wall of the side of the reaction tank 100 where the cathode plate 220 is not arranged, and the anode plate 230 and the cathode plate 220 are arranged in the two opposite side walls of the reaction tank 100. The cathode plate 220 and the anode plate 230 are arranged parallel to the inner wall of the reaction tank 100. Preferably, the cathode plate 220 is as close as possible to the side wall of one side of the reaction tank 100, which is the side wall of the reaction tank 100 parallel to and closest to the cathode plate 220, and the same applies to the anode plate 230 and the cathode plate 220.

[0033] In an implementable manner, the cathode plate 220 and the anode plate 230 are of equal size and are arranged in parallel with each other; the cathode plate 220 and the anode plate 230 are arranged alternately at intervals to form an electrode plate module, and the electrode plate module is arranged in the reaction tank 100.

[0034] In an implementable manner, the cathode plate 220 and the anode plate 230 are of the same size, and the projected area of one side of the cathode plate 220 and the anode plate 230 is 1 / 4 - 3 / 4 of the area of one side of the reaction tank 100. The larger the cathode plate 220 and the anode plate 230 are in the reaction tank 100, the better the reaction effect and the higher the rate.

[0035] In an implementable manner, the tail gas treatment group includes: an alkali scrubber 410, an adsorption tank 420, and an exhaust stack 430. The gas outlet of the reaction tank 100 is connected to the inlet end of the alkali scrubber 410 through a pipeline, the outlet end of the alkali scrubber 410 is connected to the inlet end of the adsorption tank 420 through a pipeline, and the outlet end of the adsorption tank 420 is communicated with the exhaust stack 430. The tail gas treatment group is used for treating and discharging the waste gas generated in the reaction tank 100.

[0036] In an implementable manner, the tail gas treatment group further includes a centrifugal fan 440. The centrifugal fan 440 is arranged between the adsorption tank 420 and the exhaust stack 430, and the outlet end of the adsorption tank 420 is connected to the centrifugal fan 440 through a pipeline.

[0037] In an implementable manner, the adsorption tank 420 is an activated carbon adsorption tank 420.

[0038] In an implementable manner, the reaction tank 100 is of a cuboid structure. The water inlet and the gas inlet of the reaction tank 100 are respectively arranged on two adjacent side walls of the reaction tank 100, and both the water inlet and the gas inlet of the reaction tank 100 are arranged near the bottom of the reaction tank 100.

[0039] As an advanced oxidation technology, the electrocatalytic oxidation technology of the present application can effectively achieve the degradation and even complete mineralization of pollutants. The removal rates of its COD and ammonia nitrogen can be nearly 100%, and the treatment conditions are relatively mild, which is very suitable for the treatment of high-salt sewage that is difficult to biodegrade. However, since the electrocatalytic anode catalytic materials are mainly precious metal oxides, the equipment investment and the cost of electrode plate depreciation are relatively high. In order to reduce the investment and operation costs, it is necessary to shorten the reaction time of the electrocatalytic device. The present application also adds an ozone generator 300, which uses the electric field effect to promote the production of reactive oxygen species during the decomposition of ozone, can significantly improve the oxidation efficiency and reaction speed, reduce the reaction time of the electrocatalytic reaction device, and thus effectively reduce the equipment investment and operation costs under the condition of obtaining the same treatment level.

[0040] It should be noted that although a coal chemical zero-emission high-salt and difficult-to-degrade wastewater electrochemical and ozone coupling reaction device is introduced above by taking this application as an example, those skilled in the art can understand that this application should not be limited thereto. In fact, users can flexibly set each parameter according to personal preferences and / or actual application scenarios as long as the design is reasonable.

[0041] In this way, the high-salt sewage enters from the water distribution system at the bottom of the reaction tank through the water inlet of the reaction tank, and the ozone generated by the ozone generator enters from the gas distribution system at the bottom of the reaction tank through the gas inlet of the reaction tank. The ozone and the sewage degrade and even mineralize the pollutants in the sewage in the reaction tank. An electrocatalytic group is also provided, which can promote the production of active oxygen in the ozone decomposition process, thereby increasing the reaction rate of the sewage in the reaction tank. Through the dual oxidation of the electrocatalytic group and ozone, the reaction time is reduced. In addition, the gas outlet of the reaction tank is connected to the tail gas treatment group, which can treat the harmful gases in the tail gas and then discharge them. According to a coal chemical zero-emission high-salt and difficult-to-degrade wastewater electrochemical and ozone coupling reaction device of the present application, the reaction efficiency is improved without reducing the reaction effect in an environmentally friendly manner, thereby effectively shortening the reaction time.

[0042] The above has described the embodiments of the present application. The above description is exemplary and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles of the embodiments, the practical application, or the improvement of the technology in the market, or to enable other ordinary skilled in the art in this technical field to understand the disclosed embodiments.

Claims

1. A zero-emission high-salinity and difficult-to-degrade wastewater electrochemical and ozone coupling reaction device, characterized in that: include: Reaction cell, electrocatalytic group, ozone generator, tail gas treatment group; The reaction tank is a hollow box, and a water distribution system and an air distribution system are arranged at the bottom of the reaction tank, and the water distribution system is suitable for connecting with the pipeline between the water inlet end; The outlet end of the ozone generator is connected to the air inlet end of the reaction tank through a pipeline, and the ozone generator is connected to the air distribution system; The gas outlet end of the reaction tank is connected to the tail gas treatment group through a pipeline; Part of the electrocatalytic group is disposed in the reaction cell, and the electrocatalytic group is adapted to produce a synergistic reaction with ozone in the reaction cell.

2. The electrochemical and ozone coupling reaction device for zero-emission high-salinity refractory wastewater from coal chemical industry according to claim 1 is characterized in that: The electrocatalytic group comprises: a DC power supply, a cathode plate and an anode plate, wherein the cathode plate is electrically connected to the DC power supply, and the anode plate is electrically connected to the DC power supply; The DC power supply is arranged outside the reaction cell, and the cathode plate and the anode plate are inside the reaction cell.

3. The electrochemical and ozone coupling reaction device for zero-emission high-salinity refractory wastewater from coal chemical industry according to claim 2 is characterized in that: The cathode plate and the anode plate are arranged opposite to each other, and there is a preset distance between the cathode plate and the anode plate.

4. The electrochemical and ozone coupling reaction device for zero-emission high-salinity refractory wastewater from coal chemical industry according to claim 3 is characterized in that: The cathode plate is arranged close to an inner wall of one side of the reaction pool, the anode plate is arranged close to an inner wall of a side of the reaction pool where no cathode plate is arranged, and the anode plate and the cathode plate are arranged in two opposite side walls of the reaction pool.

5. The electrochemical and ozone coupling reaction device for zero-emission high-salinity refractory wastewater from coal chemical industry according to claim 3 is characterized in that: The cathode plate and the anode plate are equal in size and are arranged in parallel; There are multiple cathode plates and multiple anode plates, and the multiple cathode plates and multiple anode plates are arranged at intervals. The cathode plates and the anode plates are arranged parallel to the inner wall of the reaction tank.

6. The electrochemical and ozone coupling reaction device for zero-emission high-salinity refractory wastewater from coal chemical industry according to claim 3 is characterized in that: The cathode plate and the anode plate are of the same size, and the projection area of ​​one side of the cathode plate and the anode plate is 1 / 4-3 / 4 of the area of ​​one side of the reaction pool.

7. The electrochemical and ozone coupling reaction device for zero-emission high-salinity refractory wastewater from coal chemical industry according to any one of claims 1 to 6, characterized in that: The tail gas treatment group includes: an alkali washing tower, an adsorption tank and an exhaust pipe. The gas outlet of the reaction pool is connected to the inlet end of the alkali washing tower by a pipeline, the outlet end of the alkali washing tower is connected to the inlet end of the adsorption tank by a pipeline, and the outlet end of the adsorption tank is connected to the exhaust pipe.

8. The electrochemical and ozone coupling reaction device for zero-emission high-salinity refractory wastewater from coal chemical industry according to claim 7 is characterized in that: The tail gas treatment group further includes a centrifugal fan, which is disposed between the adsorption tank and the exhaust pipe, and the outlet end of the adsorption tank is connected to the centrifugal fan by a pipeline.

9. The electrochemical and ozone coupling reaction device for zero-emission high-salinity refractory wastewater from coal chemical industry according to claim 7 is characterized in that: The adsorption tank is an activated carbon adsorption tank.

10. The electrochemical and ozone coupling reaction device for zero-emission high-salinity refractory wastewater from coal chemical industry according to any one of claims 1 to 6, characterized in that: The reaction pool is a rectangular parallelepiped structure, the water inlet and the air inlet of the reaction pool are respectively arranged on two adjacent side walls of the reaction pool, and the water inlet and the ozone air inlet of the reaction pool are both arranged near the bottom of the reaction pool.

Images