Organic wastewater treatment device

Abstract

The utility model discloses an organic wastewater treatment device which comprises a water drainage pipeline, the water drainage pipeline is sequentially connected with a wastewater storage part, an electrolytic tank and a plurality of degradation parts in series along the water drainage direction, the degradation parts are connected in parallel, and inlet pipelines of the degradation parts are communicated with an outlet pipeline of the electrolytic tank. And the outlet pipelines are communicated with a purified water discharge end. An anode electrode and a cathode electrode which are arranged at an interval are arranged in the electrolytic tank, the anode electrode and the cathode electrode are respectively connected with an anode and a cathode of an external power supply, and the cathode electrode divides the electrolytic tank into an electrolysis chamber and an air chamber. According to the organic wastewater treatment device, an electrolysis process and a wastewater degradation process are respectively carried out in the electrolytic tank and the degradation part, so that deposition of ferric salt on the surface of the electrode in the wastewater degradation process is avoided, and the service life of the electrode is prolonged. And a plurality of parallel degradation parts are arranged at the downstream of the electrolytic tank, so that the wastewater in the electrolytic tank can be continuously discharged, and the wastewater treatment effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater treatment, and particularly relates to an organic wastewater treatment device. Background Art

[0002] The safety of water resources is truly crucial for people's health and the sustainable development of the ecological environment. With the development of the human organic synthesis industry and technology, a large number of new organic substances such as various new drugs, hormones, endocrine disruptors, and dyes have been produced. During the production process of these organic substances, a large amount of organic wastewater is generated. The polycyclic aromatic hydrocarbons, halogenated hydrocarbons, heterocyclic compounds, etc. contained in this wastewater are highly toxic, complex in composition, and highly harmful to the ecosystem. If this organic wastewater is not effectively treated and discharged into natural water bodies, it may cause relatively serious water pollution incidents.

[0003] In the prior art, the electrochemical system is one of the effective ways to treat organic wastewater. By using electric energy to oxidize the refractory organic pollutants in the organic wastewater, the purpose of purifying water is achieved, such as the anodic oxidation method. The improvement of the degradation efficiency of the electrochemical system has also become the key content that scientific research needs to overcome, and the combination of free radical oxidation can greatly improve the pollutant degradation efficiency. Among them, as a kind of advanced electrochemical oxidation, the electro-Fenton or electro-catalytic ozonation process can in-situ generate hydrogen peroxide through the electrochemical process, and then decompose into hydroxyl radicals under the catalytic action of ferrous salts or ozone. These active radicals can strongly attack the soluble organic pollutants in water, and can degrade the heterocyclic organic macromolecules into chain-like small molecules such as organic acids or hydrocarbons, and even degrade them into inorganic salts, CO2, and water.

[0004] Currently, the electrolysis to generate hydrogen peroxide and the degradation of wastewater usually occur in the same reaction site. Researchers pay more attention to the relevant mechanisms of the electrode surface and the catalytic efficiency. For example, the Chinese patent document (publication number: CN112723496A) discloses a flow-through electrochemical system and application for the co-generation of two oxidants by dual electrodes for the treatment of organic wastewater. This electrochemical system generates hydrogen peroxide by reducing oxygen at the cathode and generates persulfate by oxidizing sulfate ions at the anode. By coupling the catalytic action of ferrous ions and the advantages of three-dimensional electrodes, hydrogen peroxide and persulfate are respectively activated into hydroxyl radicals and sulfate radicals to efficiently remove the refractory pollutants in organic wastewater.

[0005] However, during the process of treating wastewater with this electrochemical system, the ferrous salts participating in the reaction often form complexes, iron oxides, or iron hydroxides with organic substances and deposit on the cathode surface, covering the active sites on the cathode surface, resulting in a decrease in the hydrogen peroxide yield, and further causing the failure of the electrode, leading to a decrease in the original electrolysis reaction efficiency, thus requiring the replacement of a new electrode, that is, greatly shortening the service life of the electrode. Summary of the Utility Model

[0006] The purpose of the present utility model is to solve the technical problem that in the prior art, during the treatment of process wastewater by an electrochemical system, the divalent iron salt participating in the reaction often forms complexes or iron oxides, etc., which are deposited on the cathode surface, covering the active sites on the cathode surface, resulting in a decrease in the hydrogen peroxide yield, and further causing the failure of the electrode, leading to a decrease in the efficiency of the original electrolysis reaction, thus requiring the replacement of a new electrode, that is, greatly shortening the service life of the electrode.

[0007] To solve the above technical problem, an organic wastewater treatment device is disclosed in an embodiment of the present utility model. This organic wastewater treatment device includes a drainage pipeline. One end of the drainage pipeline is the wastewater inlet end, and the other end is the purified water discharge end. The drainage pipeline is sequentially connected in series with a wastewater storage member, an electrolytic cell, and a plurality of degradation components connected in parallel along the drainage direction. One end of each of the plurality of degradation components is communicated with the drainage pipeline downstream of the electrolytic cell, and the other end is communicated with the purified water discharge end.

[0008] An anode electrode and a cathode electrode are arranged at intervals in the electrolytic cell. The anode electrode and the cathode electrode are respectively connected to the positive and negative poles of an external power supply. The cathode electrode divides the interior of the electrolytic cell into an electrolysis chamber and an air chamber, and the anode electrode is located in the electrolysis chamber.

[0009] Among them, at least part of the anode electrode and the cathode electrode in the energized state are immersed in the wastewater in the electrolytic cell, and hydrogen peroxide is electrolyzed and generated in the wastewater.

[0010] Moreover, a reducing agent is provided in any one of the plurality of degradation components. Hydrogen peroxide in the wastewater introduced into the degradation component reacts with the reducing agent to generate hydroxyl radicals.

[0011] Adopting the above technical solution, when this organic wastewater treatment device is in use, the wastewater enters the drainage pipeline from the wastewater inlet end, then first enters the wastewater storage member for temporary storage, and then enters the electrolytic cell through the drainage pipeline. When the wastewater in the electrolytic cell reaches a predetermined storage volume, the anode electrode and the cathode electrode in the electrolytic cell are energized for electrolysis, and the generated hydrogen peroxide is dissolved in the wastewater. When the hydrogen peroxide in the wastewater is sufficient, the wastewater in the electrolytic cell is discharged into one of the plurality of degradation components through the drainage pipeline. The reducing agent in the degradation pipe reacts with the hydrogen peroxide in the wastewater to produce hydroxyl radicals. These active radicals strongly attack the soluble organic pollutants in the wastewater, and can degrade the heterocyclic organic macromolecules into chain-like small molecules such as organic acids or hydrocarbons, and even degrade them into inorganic salts, CO2 and water. Finally, the treated water is discharged from the purified water discharge end to complete the degradation of the wastewater. When the wastewater in the degradation component is saturated, the wastewater is discharged into the remaining degradation components.

[0012] This organic wastewater treatment device separates the electrolysis process and the wastewater degradation process in the electrolytic cell and the degradation component respectively, avoiding the deposition of iron salts on the electrode surface during the wastewater degradation process, thereby prolonging the service life of the electrode and achieving the purpose of reducing costs. By arranging multiple parallel degradation components downstream of the electrolytic cell, they can be used simultaneously, enabling the continuous discharge of wastewater in the electrolytic cell and improving the effect of wastewater treatment. In addition, the cathode electrode not only functions to electrolyze and generate hydrogen peroxide, but also can divide the electrolytic cell into an electrolysis chamber and an air chamber without the need for an additional separation structure, simplifying the structure of the electrolytic cell.

[0013] An embodiment of the present invention also discloses an organic wastewater treatment device. In the electrolytic cell, both the anode electrode and the cathode electrode extend in the vertical direction and are spaced apart from each other in the horizontal direction; moreover, the sidewall edge of the cathode electrode is hermetically and adaptively connected to the inner wall of the electrolytic cell.

[0014] Among them, the electrolytic cell has a wastewater inlet joint and a wastewater outlet joint located on both sides respectively. The wastewater inlet joint is connected to the wastewater storage member, and the wastewater outlet joint is connected to multiple degradation components.

[0015] The cathode electrode is arranged on one side of the electrolytic cell close to the wastewater outlet joint, and the anode electrode is arranged on the other side, outside the wastewater outlet joint. The space where the cathode electrode faces away from the wastewater joint forms an air chamber.

[0016] Adopting the above technical solution, after storing wastewater in the electrolytic cell, the anode electrode and the cathode electrode in the electrolytic cell are energized for electrolysis. Since the cathode electrode is arranged on one side of the electrolytic cell close to the wastewater outlet joint, the hydrogen peroxide electrolytically generated by the cathode electrode can dissolve more near the wastewater outlet joint, so that the wastewater output from the wastewater outlet joint contains sufficient hydrogen peroxide and can fully react with the reducing agent in the degradation component, thereby generating hydroxyl radicals to degrade the wastewater.

[0017] Moreover, during the electrolysis process of the electrolytic cell, the air chamber beside the cathode electrode can ensure sufficient oxygen supply to the cathode region, ensuring that oxygen can be evenly distributed on the surface of the cathode electrode, thereby improving the electrolysis efficiency. And the uniform oxygen distribution helps to reduce the concentration polarization phenomenon during electrolysis, making the electrochemical reaction more sufficient and efficient.

[0018] An embodiment of the present invention also discloses an organic wastewater treatment device. The sidewall edge of the cathode electrode is connected to the inner wall of the electrolytic cell by a buckle, and a strip-shaped sealing member is arranged at the part where the periphery of the cathode electrode is in contact with the electrolytic cell.

[0019] With the above technical solution, since the cathode electrode is a consumable part during the electrolysis process, the cathode electrode connected by the buckle has the advantage of being easy to disassemble and assemble on the premise of ensuring the connection reliability between the cathode electrode and the inner wall of the electrolytic cell, which is convenient for replacing the cathode electrode. Moreover, a strip-shaped seal is provided at the part where the periphery of the cathode electrode is in contact with the electrolytic cell, which can prevent the waste water in the electrolysis chamber from leaking from the periphery of the cathode electrode to the air chamber.

[0020] An embodiment of the present utility model also discloses an organic waste water treatment device. In the electrolytic cell, both the anode electrode and the cathode electrode extend along the horizontal direction and are spaced apart from each other in the vertical direction.

[0021] Moreover, the cathode electrode is arranged above the anode electrode and floats on the liquid surface of the waste water. In the electrolytic cell, the space above the cathode electrode forms an air chamber, and the space below the cathode electrode forms an electrolysis chamber.

[0022] With the above technical solution, the anode electrode and the cathode electrode extend along the horizontal direction, and the cathode electrode is arranged above the cathode electrode and floats on the liquid surface of the waste water. During the electrolysis process, the hydrogen peroxide generated by the cathode electrode can be evenly distributed in the waste water from the side of the cathode electrode in contact with the liquid surface, while the side of the cathode electrode facing away from the liquid surface is directly exposed outside the liquid surface to contact the oxygen in the atmosphere, ensuring that the oxygen can be evenly distributed on the surface of the cathode electrode, thereby improving the electrolysis efficiency.

[0023] An embodiment of the present utility model also discloses an organic waste water treatment device. A first valve assembly and a first flow meter are arranged on the drain pipeline between the waste water storage part and the electrolytic cell.

[0024] Moreover, a second valve assembly and a second flow meter are arranged on the drain pipeline between the electrolytic cell and multiple degradation parts.

[0025] With the above technical solution, the first flow meter arranged between the waste water storage part and the electrolytic cell and the second flow meter arranged between the electrolytic cell and multiple degradation parts can respectively detect the waste water inflow and outflow of the electrolytic cell, and by controlling the first valve assembly and the second valve assembly, control the waste water inflow and outflow of the electrolytic cell, so that the waste water content in the electrolytic cell is maintained within a predetermined range, and the hydrogen peroxide content generated by electrolysis in the electrolytic cell matches the waste water content.

[0026] An embodiment of the present utility model also discloses an organic waste water treatment device. A third valve assembly is arranged on the inlet pipeline of each degradation part, and a fourth valve assembly is arranged on the outlet pipeline of each degradation part.

[0027] A fifth valve assembly is arranged on the drain pipeline between the waste water inlet end and the waste water storage part.

[0028] With the above technical solution, a third valve assembly is provided in the inlet pipeline of each degradation component. When the third valve assembly is opened, the wastewater enters the corresponding degradation component for degradation. When the wastewater in the degradation component is sufficient or is being degraded, the third valve assembly is closed. When the degradation of the wastewater in the degradation component is completed, the fourth valve assembly on the outlet pipeline of the degradation component is opened, so that the degraded wastewater is discharged from the degradation component.

[0029] Moreover, by opening and closing the fifth valve assembly provided between the wastewater inlet end and the wastewater storage member, it is possible to control whether the wastewater enters the organic wastewater treatment device. The fifth valve assembly is normally open. When the organic wastewater treatment device fails or stops working, the fifth valve assembly is closed.

[0030] An embodiment of the present utility model also discloses an organic wastewater treatment device, in which a detachable filter member is provided in the wastewater storage member.

[0031] With the above technical solution, the filter member provided in the wastewater storage member can filter out suspended solids and impurities in the wastewater, avoiding the influence of suspended solids and impurities on the performance of the cathode electrode during the subsequent electrolysis process.

[0032] An embodiment of the present utility model also discloses an organic wastewater treatment device, and a hydrogen peroxide concentration detection sensor is further provided downstream of the second valve assembly on the drain pipeline.

[0033] With the above technical solution, the hydrogen peroxide concentration detection sensor provided downstream of the second valve assembly can detect the hydrogen peroxide concentration in the wastewater discharged from the electrolytic cell, ensuring that there is sufficient hydrogen peroxide in the wastewater discharged into the degradation component to react with the reducing agent to generate hydroxyl radicals.

[0034] An embodiment of the present utility model also discloses an organic wastewater treatment device, and a water quality detector is further provided downstream of the fourth valve assembly on the drain pipeline.

[0035] Moreover, this organic wastewater treatment device further includes a reflux pipeline. One end of the reflux pipeline is connected to the downstream part of the drain pipeline where the water quality detector is located, and the other end is connected to the upstream part of the drain pipeline where the wastewater storage member is located. A sixth valve assembly is provided on the reflux pipeline.

[0036] With the above technical solution, the water quality detector provided downstream of the fourth valve assembly can detect the degraded wastewater discharged from the degradation component to ensure that the refractory pollutants in the water quality have been removed. If the water quality detector detects that the wastewater does not meet the discharge standard, the sixth valve assembly on the reflux pipeline is opened, and the wastewater is sent back to the upstream of the drain pipeline through the reflux pipeline for re-treatment.

[0037] The embodiments of the present utility model also disclose an organic wastewater treatment device, and stirring components are arranged at the bottoms of a plurality of degradation components and an electrolytic cell.

[0038] Adopting the above technical solution, with stirring components arranged at the bottoms of a plurality of degradation components and an electrolytic cell, it can play a catalytic role in the electrolysis process in the electrolytic cell and the degradation process in the degradation components, ensuring sufficient reaction.

[0039] The beneficial effects of the present utility model are as follows:

[0040] The present utility model discloses an organic wastewater treatment device. This organic wastewater treatment device includes a drainage pipeline. One end of the drainage pipeline is the wastewater inlet end, and the other end is the purified water discharge end. The drainage pipeline is sequentially connected in series with a wastewater storage component, an electrolytic cell, and a plurality of degradation components connected in parallel along the drainage direction. One ends of the plurality of degradation components are all communicated with the drainage pipeline downstream of the electrolytic cell, and the other ends are all communicated with the purified water discharge end. An anode electrode and a cathode electrode are arranged at intervals in the electrolytic cell. The anode electrode and the cathode electrode are respectively connected to the positive pole and the negative pole of an external power supply. The cathode electrode divides the interior of the electrolytic cell into an electrolysis chamber and an air chamber, and the anode electrode is located in the electrolysis chamber. This organic wastewater treatment device conducts the electrolysis process and the wastewater degradation process respectively in the electrolytic cell and the degradation components, avoiding the deposition of iron salts on the electrode surface during the wastewater degradation process, thereby prolonging the service life of the electrode and achieving the purpose of cost reduction. And by arranging a plurality of parallel degradation components downstream of the electrolytic cell, they can be used simultaneously, enabling the continuous discharge of wastewater in the electrolytic cell and improving the effect of wastewater treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic diagram of the organic wastewater treatment device provided by an embodiment of the present utility model;

[0042] Figure 2 It is a schematic diagram of the wastewater storage component of the organic wastewater treatment device provided by an embodiment of the present utility model;

[0043] Figure 3 It is a schematic diagram of an electrolytic cell (the anode electrode is not shown) of the organic wastewater treatment device provided by an embodiment of the present utility model;

[0044] Figure 4 It is a schematic diagram of another electrolytic cell of the organic wastewater treatment device provided by an embodiment of the present utility model.

[0045] Description of the reference numerals:

[0046] 10. Organic wastewater treatment device;

[0047] 100. Drainage pipeline; 110. Wastewater inlet end; 120. Purified water discharge end;

[0048] 130. First valve assembly; 140. First flowmeter; 150. Second valve assembly; 160. Second flowmeter;

[0049] 170. Third valve assembly; 180. Fourth valve assembly; 190. Fifth valve assembly;

[0050] 200. Wastewater storage component; 210. Filter component;

[0051] 300. Electrolytic cell; 310. Wastewater inlet joint; 320. Wastewater outlet joint;

[0052] 330. Anode electrode; 340. Cathode electrode; 350. Electrolysis chamber; 360. Air chamber; 370. Buckle;

[0053] 400. Degradation component;

[0054] 500. Stirring component;

[0055] 600. External power supply; 610. Positive electrode; 620. Negative electrode;

[0056] 700. Return pipeline; 710. Sixth valve assembly. Detailed implementation manners

[0057] Electrochemical wastewater treatment is a green water treatment technology with broad application prospects. With the continuous progress of technology and the gradual reduction of costs, electrochemical technology will play a more important role in the field of wastewater treatment. The basic principle of electrochemical water treatment technology is based on electrochemical reactions, including direct electrolysis and indirect electrolysis. Direct electrolysis means that pollutants directly undergo oxidation or reduction reactions on the electrodes, thereby being degraded or removed; indirect electrolysis uses the redox substances generated during the electrochemical process as a medium to indirectly promote the degradation of pollutants.

[0058] The following mainly explains the electro-Fenton reaction in indirect electrolysis. The basic principle of the electro-Fenton reaction is that during the electrolysis process, hydrogen peroxide (H2O2) is generated through the reduction reaction at the cathode. At the same time, iron ions (Fe 2+ ) can be regenerated through the reduction reaction at the cathode or directly added from the outside. Under acidic conditions, hydrogen peroxide reacts with iron ions to generate highly oxidizing hydroxyl radicals (·OH). These radicals can react with organic pollutants in the wastewater without selectivity, degrading them into low-molecular-weight compounds (such as CO2, H2O) and non-toxic and harmless substances.

[0059] However, there are also defects in using the electro-Fenton reaction to degrade wastewater. During the electro-Fenton reaction process, in addition to the degradation of organic pollutants, some sediments may also be generated. These sediments mainly include the following types:

[0060] 1. In the electro-Fenton reaction, when the pH value of the solution is relatively high (usually greater than 4), iron ions (Fe 3+ ) will combine with hydroxide ions (OH - ) in water to form iron hydroxide (Fe(OH)3) precipitate. This precipitate has a certain flocculation effect on the pollutants in the wastewater, which helps to remove the pollutants. However, if there is too much sediment, it may cause inconvenience to the subsequent treatment;

[0061] 2. If the wastewater contains other metal ions, such as aluminum (Al 3+ ), manganese (Mn 2+ ), etc., during the electro-Fenton reaction process, these metal ions may also combine with hydroxide ions to form corresponding hydroxide or oxide sediments;

[0062] 3. The electro-Fenton reaction degrades organic pollutants by generating strongly oxidizing hydroxyl radicals. However, during the degradation process, the organic matter may be partially oxidized to intermediate products, and these intermediate products may react with metal ions under certain conditions to form insoluble sediments.

[0063] Complexes or iron oxides are formed and deposited on the cathode surface, covering the active sites on the cathode surface, resulting in a decrease in the hydrogen peroxide yield, and then causing the failure of the electrode, leading to a decrease in the efficiency of the original electrolysis reaction, thus requiring the replacement of a new electrode, that is, greatly shortening the service life of the electrode and increasing the process cost.

[0064] Therefore, the present utility model provides an organic wastewater treatment device. This organic wastewater treatment device at least includes a wastewater storage member, an electrolytic cell, and a plurality of degradation members connected in parallel in series. The wastewater is first filtered in the wastewater storage member, and then electrolyzed through the electrolytic cell to generate hydrogen peroxide in the wastewater. Finally, it is degraded through a plurality of degradation members, and the reducing substance of hydrogen peroxide is introduced into the wastewater from within the degradation members, avoiding the deposition of iron salts on the electrode surface in the electrolytic cell during the wastewater degradation process, thereby prolonging the service life of the electrode.

[0065] To make the objectives, technical solutions, and advantages of the present utility model clearer, the following will further describe the embodiments of the present utility model in detail with reference to the accompanying drawings.

[0066] As Figure 1As shown in the figure, an embodiment of the present utility model provides an organic wastewater treatment device 10. This organic wastewater treatment device 10 includes a drainage pipeline 100. One end of the drainage pipeline 100 is a wastewater inlet end 110, and the other end is a purified water discharge end 120. The drainage pipeline 100 is sequentially connected in series with a wastewater storage member 200, an electrolytic cell 300, and a plurality of degradation components 400 connected in parallel with each other along the drainage direction. One ends of the plurality of degradation components 400 are all communicated with the drainage pipeline 100 downstream of the electrolytic cell 300, and the other ends are all communicated with the purified water discharge end. It should be noted that the number of the degradation components 400 can be one, two, three or other numbers, and the present utility model does not make specific limitations on this. For the convenience of description, three degradation components 400 are used for illustration.

[0067] The electrolytic cell 300 is internally provided with an anode electrode 330 and a cathode electrode 340 arranged at intervals. The anode electrode 330 and the cathode electrode 340 are respectively connected to the positive electrode 610 and the negative electrode 620 of an external power supply 600. The cathode electrode 340 divides the inside of the electrolytic cell 300 into an electrolytic chamber 350 and an air chamber 360, and the anode electrode 330 is located in the electrolytic chamber 350.

[0068] Among them, at least part of the anode electrode 330 and the cathode electrode 340 in the energized state are immersed in the wastewater in the electrolytic cell 300, and hydrogen peroxide is electrolyzed and generated in the wastewater.

[0069] Moreover, a reducing agent is provided in any one of the plurality of degradation components 400. The hydrogen peroxide in the wastewater introduced into the degradation component 400 reacts with the reducing agent to generate hydroxyl radicals (·OH). It should be noted that the reducing agent is a reducing substance of hydrogen peroxide, and can be a divalent iron salt, ozone or other substances capable of reducing hydrogen peroxide. The present utility model does not make specific limitations on this. For the convenience of description, a divalent iron salt is taken as an example below. The divalent iron salt can be ferrous chloride, ferrous sulfate, etc., and the present utility model does not make specific limitations on this.

[0070] Specifically, when this organic wastewater treatment device 10 is in use, wastewater enters the drainage pipeline 100 from the wastewater inlet end 110, then first enters the wastewater storage component 200 for temporary storage, and then enters the electrolytic cell 300 through the drainage pipeline 100. When the wastewater in the electrolytic cell 300 reaches the predetermined storage volume, the anode electrode 330 and the cathode electrode 340 in the electrolytic cell 300 are energized for electrolysis, and the generated hydrogen peroxide dissolves in the wastewater. When there is enough hydrogen peroxide in the wastewater, the wastewater in the electrolytic cell 300 is discharged into one of the multiple degradation components 400 through the drainage pipeline 100. The reducing agent in the degradation tube reacts with the hydrogen peroxide in the wastewater to produce hydroxyl radicals (·OH). These active radicals strongly attack the soluble organic pollutants in the wastewater, and can degrade the heterocyclic organic macromolecules into chain-like small molecules such as organic acids or hydrocarbons, and even degrade them into inorganic salts, carbon dioxide (CO2) and water. Finally, the clean water is discharged from the clean water outlet end 120 to complete the degradation of the wastewater. When the wastewater in the degradation component 400 is saturated, the wastewater is discharged to the remaining degradation components 400. It should be noted that a water pump for driving the movement of the wastewater is provided on the drainage pipeline 100. Regarding the specific design position and model of the water pump, the present utility model does not make specific limitations.

[0071] In order to ensure that the degradation of the wastewater can meet the requirements, a water quality detector can be provided on the upstream side of the clean water outlet end 120 to detect the water discharged from the degradation component 400. The water quality detector is an instrument used to monitor various components in the water, and judges the water quality condition by measuring the chemical and physical parameters in the water. The working principle of the water quality detector is mainly based on sensor technology and chemical analysis methods. The sensor is the core component of the water quality detector, which can convert the measured parameter into an electrical signal, so as to realize the real-time monitoring of the water quality. In this embodiment, the type of the water quality detector is specifically determined according to the organic pollutants in the wastewater, and the present utility model does not make specific limitations.

[0072] This organic wastewater treatment device 10 carries out the electrolysis process and the wastewater degradation process in the electrolytic cell 300 and the degradation component 400 respectively, avoiding the deposition of iron salts on the electrode surface during the wastewater degradation process, thereby prolonging the service life of the electrode and achieving the purpose of reducing costs. And multiple parallel degradation components 400 are provided downstream of the electrolytic cell 300, which can be used simultaneously, so that the wastewater in the electrolytic cell 300 can be continuously discharged, improving the effect of treating wastewater. In addition, the cathode electrode 340 not only functions to electrolyze and generate hydrogen peroxide, but also can divide the electrolytic cell 300 into an electrolysis chamber 350 and an air chamber 360, without the need to additionally set a partition structure, simplifying the structure of the electrolytic cell 300.

[0073] Next, along the flow direction of the wastewater, each component on the organic wastewater treatment device 10 will be described in turn.

[0074] As Figure 1 and Figure 2 shown, the wastewater storage member 200 will be described first. The wastewater storage member 200 is mainly used for temporarily storing wastewater, and a detachable filter member 210 is provided inside the wastewater storage member 200. On the one hand, through the filter member 210 provided in the wastewater storage member 200, suspended solids and impurities in the wastewater can be filtered out, avoiding the influence of suspended solids and impurities on the performance of the cathode electrode 340 during the subsequent electrolysis process. On the other hand, by arranging the wastewater storage member 200 on the side of the wastewater inlet end 110 of the drainage pipeline 100, it is beneficial to control the progress of wastewater treatment, that is, buffer the wastewater through the wastewater storage member 200.

[0075] Specifically, the filter member 210 can be set as an activated carbon fiber filter layer. The activated carbon fiber filter layer can not only filter out suspended solids and impurities in the raw water, but also adsorb some organic substances in the water to a certain extent, and conduct preliminary treatment of the wastewater. The filter member 210 can be fixed in the wastewater storage member 200 by means of snap connection, screw connection or other detachable connection methods, and the present utility model does not make specific limitations thereon.

[0076] Moreover, in order to prevent the leakage of wastewater, a sealing member can be correspondingly arranged between the outer edge of the filter member 210 and the inner wall of the wastewater storage member 200.

[0077] It should be noted that regarding the size of the accommodation space of the wastewater storage member 200, those skilled in the art can design it according to the actual situation and specific requirements, and the present embodiment does not make specific limitations thereon. Of course, the inner side wall of the wastewater storage member 200 needs to have stable chemical properties to avoid being damaged by corrosive substances in the wastewater.

[0078] The electrolytic cell 300 is a core component of this wastewater treatment device, mainly serving as a place where the cathode electrode 340 reduces to generate hydrogen peroxide (H2O2) during the electrolysis process.

[0079] As Figure 1 and Figure 3 shown, in one embodiment, inside the electrolytic cell 300, both the anode electrode 330 and the cathode electrode 340 extend in the vertical direction and are spaced apart from each other in the horizontal direction; moreover, the side wall edge of the cathode electrode 340 is hermetically connected to the inner wall of the electrolytic cell 300 in a matching manner.

[0080] Among them, the electrolytic cell 300 has a wastewater inlet joint 310 and a wastewater outlet joint 320 located on both sides respectively. The wastewater inlet joint 310 is connected to the wastewater storage member 200, and the wastewater outlet joint 320 is connected to a plurality of degradation components 400.

[0081] The cathode electrode 340 is disposed inside the electrolytic cell 300 on the side close to the wastewater output joint 320. The cathode electrode 340 is disposed on the other side, outside the wastewater output joint 320, and the space where the cathode electrode 340 faces away from the wastewater joint forms an air chamber 360.

[0082] Specifically, after wastewater is stored in the electrolytic cell 300, the anode electrode 330 and the cathode electrode 340 inside the electrolytic cell 300 are energized for electrolysis. Since the cathode electrode 340 is disposed inside the electrolytic cell 300 on the side close to the wastewater output joint 320, the hydrogen peroxide generated by electrolysis of the cathode electrode 340 can be more dissolved near the wastewater output joint 320, so that the wastewater output from the wastewater output joint 320 contains sufficient hydrogen peroxide and can react fully with the reducing agent in the degradation component 400, thereby generating hydroxyl radicals (·OH) to degrade the wastewater.

[0083] Moreover, during the electrolysis process of the electrolytic cell 300, the air chamber 360 beside the cathode electrode 340 can ensure sufficient oxygen supply to the cathode region, ensure that oxygen can be evenly distributed on the surface of the cathode electrode 340, thereby improving the electrolysis efficiency. In addition, the uniform oxygen distribution helps to reduce the concentration polarization phenomenon during electrolysis, making the electrochemical reaction more sufficient and efficient. In addition, in order to make the electrochemical reaction more sufficient and efficient, a stirring component 500 can be disposed at the bottom of the electrolytic cell 300 to accelerate the reaction rate of hydrogen peroxide (H2O2) by stirring the wastewater inside the electrolytic cell 300.

[0084] Furthermore, as Figure 3 shown, the side wall edge of the cathode electrode 340 is connected to the inner wall of the electrolytic cell 300 through a buckle 370, and a strip-shaped seal (not shown in the figure) is provided at the part where the periphery of the cathode electrode 340 is in contact with the electrolytic cell 300. The seal can be a rubber strip commonly used in the art with good chemical properties such as acid resistance and corrosion resistance. Of course, the specific structure of the seal of the present utility model is not specifically described.

[0085] It should be noted that since the cathode electrode 340 is a consumable part during electrolysis, the cathode electrode 340 connected by the buckle 370 has the advantage of being convenient for disassembly and assembly on the premise of ensuring the connection reliability between the cathode electrode 340 and the inner wall of the electrolytic cell 300, which is convenient for replacing the cathode electrode 340. Different from the cathode electrode 340, the anode electrode 330 can be made of materials with stable chemical properties such as stainless steel, and the present utility model does not specifically limit this.

[0086] Moreover, a strip-shaped seal is provided at the part where the periphery of the cathode electrode 340 is in contact with the electrolytic cell 300, which can prevent the wastewater in the electrolysis chamber 350 from leaking from the periphery of the cathode electrode 340 to the air chamber 360.

[0087] In another alternative embodiment, as Figure 4 shown, within the electrolytic cell 300, both the anode electrode 330 and the cathode electrode 340 extend in the horizontal direction and are spaced apart from each other in the vertical direction.

[0088] Moreover, the cathode electrode 340 is disposed above the anode electrode 330 and floats on the liquid surface of the wastewater. Within the electrolytic cell 300, the space above the cathode electrode 340 constitutes an air chamber 360, and the space below the cathode electrode 340 constitutes an electrolytic chamber 350. It should be noted that, in this embodiment, since the cathode electrode 340 floats on the liquid surface of the wastewater, in order to prevent the cathode electrode 340 from shaking. Therefore, generally, a stirring member 500 is not provided at the bottom of the electrolytic cell 300 to improve the placement stability of the cathode electrode 340.

[0089] Specifically, the anode electrode 330 and the cathode electrode 340 extend in the horizontal direction, and the cathode electrode 340 is disposed above the anode electrode 330 and floats on the liquid surface of the wastewater. During the electrolysis process, the hydrogen peroxide generated by the cathode electrode 340 can be evenly distributed in the wastewater from the side where the cathode electrode 340 contacts the liquid surface, while the side of the cathode electrode 340 facing away from the liquid surface is directly exposed outside the liquid surface and in contact with the air, ensuring that oxygen can be evenly distributed on the surface of the cathode electrode 340, thereby improving the electrolysis efficiency.

[0090] It should be noted that the electrodes within the electrolytic cell 300 are not limited to the structures of the above two embodiments. In still another embodiment, both the anode electrode 330 and the cathode electrode 340 extend in the horizontal direction and are spaced apart from each other in the vertical direction. The cathode electrode 340 is disposed below the anode electrode 330, and moreover, the cathode electrode 340 divides the upper part of the electrolytic cell 300 into an electrolytic chamber 350, and the lower part constitutes an air chamber 360. It should be noted that since the cathode electrode 340 needs to bear the mass of all the wastewater, therefore, in this embodiment, attention needs to be paid to the capacity of the wastewater within the electrolytic cell 300, with the strength of the cathode electrode 340 being sufficient to bear it. Of course, regarding the structure of the electrolytic cell 300, the present utility model does not make specific limitations thereon.

[0091] As Figure 1 shown, the degradation member 400 is a place where the wastewater is degraded, and a certain concentration of hydrogen peroxide is dissolved in the wastewater introduced into the degradation member 400. Adding ferrous salts to the wastewater within the degradation member 400, the hydrogen peroxide reacts with the ferrous salts to generate strongly oxidizing hydroxyl radicals (·OH), and these radicals react with the organic pollutants in the wastewater without selectivity, degrading them into low molecular weight compounds, inorganic salts, carbon dioxide (CO2), and water (H2O), etc.

[0092] In the present utility model, the three degradation components 400 can be successively fed with wastewater, so as to degrade the wastewater successively, or they can be fed with wastewater simultaneously to degrade the wastewater simultaneously. The present utility model does not make specific limitations in this regard.

[0093] It should be noted that the dosage of ferrous salt should be:

[0094] n = CV 降解 / 255000

[0095] n is the molar mass of the added ferrous salt, with the unit of mol (mole); C is the concentration of hydrogen peroxide, with the unit of mg / L (milligram per liter); V 降解 is the volume of a single degradation component 400, with the unit of L (liter).

[0096] Regarding the way of adding ferrous salt into the degradation component 400, it can be added manually, or a storage component for ferrous salt can be provided on the degradation component 400. The storage component for ferrous salt can quantitatively transport ferrous salt into the degradation component 400 according to the content of wastewater in the degradation component 400 and the concentration of hydrogen peroxide in the wastewater. Regarding the content of ferrous salt fed into the degradation component 400, the present utility model does not make specific limitations in this regard.

[0097] Regarding the content of wastewater in the degradation component 400, it can be determined by the volume of the degradation component 400, and the concentration of hydrogen peroxide in the wastewater in the degradation component 400 can be calculated according to the electrolysis rate and duration in the electrolytic cell 300. Of course, a hydrogen peroxide concentration detection sensor can also be provided between the electrolytic cell 300 and the multiple degradation components 400 to detect the concentration of hydrogen peroxide in the wastewater flowing into the degradation component 400.

[0098] Furthermore, in order to accelerate the degradation of wastewater in the degradation component 400, a stirring component 500 can also be provided at the bottom of each degradation component 400 to accelerate the rate of the degradation reaction.

[0099] Furthermore, in order to ensure the full degradation of wastewater, in the organic wastewater treatment device 10 disclosed in the present utility model, a plurality of valve assemblies and flow meters are also provided between multiple components on the drainage pipeline 100. The following will describe the multiple valve assemblies and flow meters. It should be noted that the present utility model does not make specific limitations on the specific structures and regulations of the valve assemblies and flow meters.

[0100] In the present utility model, as Figure 1 shown, a first valve assembly 130 and a first flow meter 140 are provided on the drainage pipeline 100 between the water storage member and the electrolytic cell 300.

[0101] Moreover, a second valve assembly 150 and a second flowmeter 160 are provided on the drainage pipeline 100 between the electrolytic cell 300 and the plurality of degradation components 400.

[0102] During the operation of this organic wastewater treatment device 10, the first flowmeter 140 provided between the wastewater storage member 200 and the electrolytic cell 300 and the second flowmeter 160 provided between the electrolytic cell 300 and the plurality of degradation components 400 can respectively detect the wastewater inflow and outflow of the electrolytic cell 300, and by controlling the first valve assembly 130 and the second valve assembly 150, control the wastewater inflow and outflow of the electrolytic cell 300, so that the wastewater content in the electrolytic cell 300 is maintained within a predetermined range, and the hydrogen peroxide content generated by electrolysis in the electrolytic cell 300 matches the wastewater content.

[0103] It should be noted that the water outlet rate of the second valve assembly 150 is:

[0104] v = RA / C

[0105] v is the water outlet rate of the second valve assembly 150, with the unit L / h (liters per hour); R is the cathode hydrogen peroxide generation rate, with the unit mg / h / cm 2 (milligrams per hour per square centimeter); A is the effective area of the cathode electrode 340, with the unit cm 2 (square centimeters); C is the hydrogen peroxide concentration, with the unit mg / L (milligrams per liter).

[0106] It should be noted that in order to ensure that the wastewater content in the electrolytic cell 300 is maintained within a predetermined range, the opening degree of the first valve assembly 130 is kept consistent with the opening degree of the second valve assembly 150, that is, the water inlet rate and the water outlet rate of the electrolytic cell 300 are the same.

[0107] Furthermore, as Figure 1 shown, the embodiment of the present utility model also discloses an organic wastewater treatment device 10. A third valve assembly 170 is provided on the inlet pipeline of each degradation component 400, and a fourth valve assembly 180 is provided on the outlet pipeline.

[0108] It should be noted that a third valve assembly 170 is provided on the inlet pipeline of each degradation component 400. When the third valve assembly 170 is opened, the wastewater enters the corresponding degradation component 400 for degradation. When the wastewater in the degradation component 400 is sufficient or is being degraded, the third valve assembly 170 is closed. When the wastewater in the degradation component 400 is completely degraded, the fourth valve assembly 180 on the outlet pipeline of the degradation component 400 is opened, so that the degraded wastewater is discharged from the degradation component 400.

[0109] An embodiment of the present utility model also discloses an organic wastewater treatment device 10, and a fifth valve assembly 190 is provided on a drainage pipeline 100 between a wastewater inlet end 110 and a wastewater storage member 200.

[0110] It should be noted that by opening and closing the fifth valve assembly 190 provided between the wastewater inlet end 110 and the wastewater storage member 200, it is possible to control whether wastewater enters the organic wastewater treatment device 10. The fifth valve assembly 190 is normally open. When the organic wastewater treatment device 10 malfunctions or stops working, the fifth valve assembly 190 is closed.

[0111] Moreover, such an organic wastewater treatment device 10 further includes a reflux pipeline 700. One end of the reflux pipeline 700 is connected to a downstream portion of the drainage pipeline 100 located downstream of a water quality detector, and the other end is connected to an upstream portion of the drainage pipeline 100 located upstream of the wastewater storage member 200. A sixth valve assembly 710 is provided on the reflux pipeline 700.

[0112] Specifically, the water quality detector provided downstream of the fourth valve assembly 180 can detect the degraded and completed wastewater discharged from the degradation component 400 to ensure that the hardly degradable pollutants in the water quality have been removed. If the water quality detector detects that the wastewater does not meet the discharge standard, the sixth valve assembly 710 on the reflux pipeline 700 is opened, and the wastewater is sent back to the upstream of the drainage pipeline 100 through the reflux pipeline 700 for re-treatment.

[0113] In summary, the present utility model discloses an organic wastewater treatment device 10, and the organic wastewater treatment device 10 will be described below in combination with a working scenario.

[0114] Specifically, first, the organic industrial wastewater enters the drainage pipeline 100 from the water inlet end, passes through the fifth valve assembly 190 and then enters the wastewater storage component 200 for temporary storage. Subsequently, it enters the electrolytic cell 300 through the drainage pipeline 100 and the first valve assembly 130. After the electrolytic cell 300 is filled with water, first close the first valve assembly 130, and turn on the external power supply 600 and the stirring component 500 in the electrolytic cell 300 to produce electrochemically generated hydrogen peroxide. Subsequently, when the concentration of hydrogen peroxide reaches a predetermined amount, simultaneously open the first valve assembly 130 and the second valve assembly 150. According to the water inflow and outflow of the electrolytic cell 300 collected by the first flowmeter 140 and the second flowmeter 160, and the predetermined production rate of hydrogen peroxide, control the opening degrees of the first valve assembly 130 and the second valve assembly 150 to ensure that the production rate of electrochemically generated hydrogen peroxide is basically the same as the water outflow rate of the electrolytic cell 300, that is, in the process of continuous flow, the concentration of hydrogen peroxide in the liquid phase in the electrolytic cell 300 remains stable, or reaches at least above the concentration value at which organic matter can be degraded. Control the opening degrees of the first valve assembly 130 and the second valve assembly 150 through the production rate of hydrogen peroxide to ensure that the production amount of electrochemically generated hydrogen peroxide is basically the same as the outflow amount of hydrogen peroxide in the electrolytic cell 300.

[0115] While realizing the water inflow and outflow of the electrolytic cell 300, open the third valve assembly 170 on the inlet pipeline of a degradation component 400 to allow the organic wastewater containing hydrogen peroxide to enter the degradation component 400. After the degradation component 400 stores a sufficient amount of wastewater, turn on the stirring component 500 of the degradation component 400, and at the same time close the third valve assembly 170. Add ferrous salts equivalent to 10%-20% of the molar mass of hydrogen peroxide in divalent iron ions to the degradation component 400 to degrade the wastewater. After the degradation is completed, open the fourth valve assembly 180 to allow the treated waste liquid to enter the drainage pipeline 100 through the degradation component 400. If the water quality has reached the standard after being detected by the water quality detector, it is discharged from the purified water discharge end 120. If the water quality fails to reach the standard after being detected by the water quality detector, the sixth valve assembly 710 on the reflux pipeline 700 is opened, and the wastewater is sent back to the upstream of the drainage pipeline 100 through the reflux pipeline 700 for treatment again.

[0116] When the wastewater in one degradation component 400 is full, open the third valve assembly 170 on the inlet pipeline of another degradation component 400 to allow the wastewater containing hydrogen peroxide to enter the remaining degradation component 400 for the same process. By alternately using the three degradation components 400, the continuous electrolysis of the electrolytic cell 300 can be satisfied, that is, the continuity of the entire treatment process can be realized. Of course, the third valve assemblies 170 of the three degradation components 400 can also be opened simultaneously to carry out degradation using the three degradation components 400 at the same time.

[0117] It should be noted that, in addition to the implementation manners of the present utility model described in the above specific embodiments, those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. Although the description of the present utility model is introduced in combination with preferred embodiments, this does not mean that the features of this utility model are limited to this implementation manner. On the contrary, the purpose of introducing the utility model in combination with the implementation manner is to cover other alternatives or modifications that may be extended based on the claims of the present utility model. In order to provide a deep understanding of the present utility model, many specific details are included in the above description, and the present utility model can also be implemented without using these details. In addition, in order to avoid confusing or obscuring the key points of the present utility model, some specific details will be omitted in the description. It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0118] It should be noted that in this specification, similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0119] In the description of this embodiment, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "bottom", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed during use. It is only for the convenience of describing the present utility model and 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 should not be construed as a limitation to the present utility model.

[0120] The terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0121] In the description of this embodiment, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "connected", "connected to" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this embodiment can be understood according to specific situations.

[0122] Although the present utility model has been illustrated and described by referring to some preferred embodiments thereof, those of ordinary skill in the art should understand that the above content is a further detailed description of the present utility model in conjunction with specific embodiments, and it cannot be determined that the specific implementation of the present utility model is only limited to these descriptions. Those skilled in the art can make various changes in form and details, including making several simple deductions or substitutions, without departing from the spirit and scope of the present utility model.

Claims

1. An organic wastewater treatment device, characterized in that: It includes a drainage pipeline, one end of which is a wastewater inlet end, and the other end is a clean water outlet end. The drainage pipeline is connected in series with a wastewater storage element, an electrolytic cell, and a plurality of degradation components connected in parallel along the drainage direction; wherein, The inlet pipelines of the plurality of degradation components are all connected to the outlet pipeline of the electrolytic cell, and the outlet pipelines are all connected to the purified water discharge end; and, The electrolytic cell has an anode electrode and a cathode electrode arranged at intervals, the anode electrode and the cathode electrode are respectively connected to the positive electrode and the negative electrode of an external power supply, the cathode electrode divides the electrolytic cell into an electrolytic chamber and an air chamber, and the anode electrode is located in the electrolytic chamber; wherein, The anode electrode and the cathode electrode in the powered state are at least partially immersed in the wastewater of the electrolytic cell and electrolyze the wastewater to generate hydrogen peroxide; and, Any one of the plurality of degradation components is provided with a reducing agent, and the hydrogen peroxide in the wastewater passed into the degradation component reacts with the reducing agent to generate hydroxyl radicals.

2. The organic wastewater treatment device according to claim 1, characterized in that: In the electrolytic cell, the anode electrode and the cathode electrode extend in the vertical direction and are spaced apart from each other in the horizontal direction; and the side wall edge of the cathode electrode is adapted and sealed to the inner wall of the electrolytic cell; wherein, The electrolytic cell has a wastewater inlet joint and a wastewater outlet joint respectively located on both sides, the wastewater inlet joint is connected to the wastewater storage component, and the wastewater outlet joint is connected to the plurality of degradation components; The cathode electrode is arranged on one side of the electrolytic cell close to the wastewater output joint, and the cathode electrode is arranged on the other side, outside the wastewater output joint, and the space of the cathode electrode away from the wastewater joint constitutes the air chamber.

3. The organic wastewater treatment device according to claim 2, characterized in that: The side wall edge of the cathode electrode is connected to the inner wall of the electrolytic cell by snap-fitting, and a strip-shaped sealing member is provided at the portion where the periphery of the cathode electrode is connected to the electrolytic cell.

4. The organic wastewater treatment device according to claim 1, characterized in that: In the electrolytic cell, the anode electrode and the cathode electrode extend in the horizontal direction and are spaced apart from each other in the vertical direction; and The cathode electrode is arranged above the anode electrode and floats on the liquid surface of the wastewater. In the electrolytic cell, the space above the cathode electrode constitutes the air chamber, and the space below the cathode electrode constitutes the electrolytic chamber.

5. The organic wastewater treatment device according to any one of claims 1 to 4, characterized in that: in, A first valve assembly and a first flow meter are provided on the drainage pipeline between the wastewater storage element and the electrolytic cell; and A second valve assembly and a second flow meter are provided on the drainage pipeline between the electrolytic cell and the plurality of degradation components.

6. The organic wastewater treatment device according to claim 5, characterized in that: The inlet pipeline of each degradation component is provided with a third valve assembly, and the outlet pipeline of each degradation component is provided with a fourth valve assembly; and, A fifth valve assembly is provided on the drainage pipeline between the wastewater inlet and the wastewater storage element.

7. The organic wastewater treatment device according to claim 1, characterized in that: A detachably connected filter element is arranged in the wastewater storage element.

8. The organic wastewater treatment device according to claim 5, characterized in that: A hydrogen peroxide concentration detection sensor is also arranged on the drainage pipeline downstream of the second valve assembly.

9. The organic wastewater treatment device according to claim 1, characterized in that: A water quality detector is also provided on the drainage pipeline and downstream of the fourth valve assembly; and The organic wastewater treatment device also includes a reflux pipeline, one end of which is connected to the downstream portion of the water quality detector on the drainage pipeline, and the other end is connected to the upstream portion of the wastewater storage element on the drainage pipeline. A sixth valve assembly is arranged on the reflux pipeline.

10. The organic wastewater treatment device according to claim 2, characterized in that: A plurality of the degradation components and the bottom of the electrolytic cell are both provided with stirring components.

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