CN215855265U - Waste water electrochemical treatment device - Google Patents

Abstract

The utility model discloses an electrochemical wastewater treatment device which comprises an electrolytic reaction tank, an electrode activation tank and an electrode assembly. The electrolytic reaction tank comprises a reaction inner tank and an outer tank surrounding the reaction inner tank, and the outer tank is used for receiving overflow from the reaction inner tank; an anion exchange membrane is arranged in the electrode activation groove; the anode group and the cathode group are both used for being switchably arranged in the reaction inner tank or the electrode activation tank. After the wastewater is electrolyzed in the reaction inner tank, the electrode assembly is transferred into the electrode activation tank from the reaction inner tank, and the activation treatment is carried out in a reverse electrode mode, so that organic matters adsorbed on the surface of the electrode of the anode group and metal scales deposited on the electrode of the cathode group are removed. The metal ions are prevented from entering the first activation groove from the second activation groove through the anion exchange membrane, so that the metal ions are prevented from being deposited on the electrode of the anode group again, the electrolytic effect of the electrode is ensured, and the environment is protected.

Description

Waste water electrochemical treatment device

Technical Field

The utility model is used in the field of electrochemical treatment devices, and particularly relates to an electrochemical treatment device for wastewater.

Background

Electrochemical water treatment technology is also called electrocatalytic oxidation technology. After electrification, the electrode generates strong oxidant hydroxyl free radical (OH) under the catalytic action of the coating, and can oxidize and decompose organic matters in the wastewater into H2O and CO2, so that the method is an environment-friendly water treatment technology. The technology can treat the waste water which is difficult to degrade biologically, improve the biodegradability of the waste water, reduce the concentration of ammonia nitrogen, and reduce metal ions in the waste water. The core of the electrochemical water treatment technology is an electrode, and the higher the oxygen evolution potential of the electrode is, the better the treatment effect on the wastewater is. However, if the electrode is used for a long time, organic substances in the wastewater are adsorbed on the surface of the electrode, which poisons the electrode and reduces the electrolytic effect of the electrode.

SUMMERY OF THE UTILITY MODEL

The present invention has been made to solve at least one of the problems occurring in the prior art, and an object of the present invention is to provide an electrochemical wastewater treatment apparatus, which can effectively treat wastewater, can perform a reverse electrode activation treatment on an electrode assembly, and can ensure an electrolytic effect of an electrode.

The technical scheme adopted by the utility model for solving the technical problems is as follows:

an electrochemical wastewater treatment apparatus comprising:

the electrolytic reaction tank comprises a reaction inner tank and an outer tank surrounding the reaction inner tank, the reaction inner tank is provided with a wastewater inlet and a wastewater outlet, the outer tank is used for receiving overflow materials overflowing from the reaction inner tank, the outer tank is provided with a first discharge port, and the wastewater inlet, the wastewater outlet and the first discharge port are all communicated with the outside;

the electrode activation tank is internally provided with an anion exchange membrane, the anion exchange membrane divides the electrode activation tank into a first activation tank and a second activation tank, and electrolyte solution is put into the first activation tank and the second activation tank;

and the electrode assembly comprises an anode group and a cathode group, the anode group and the cathode group are both used for being switchably arranged in the reaction inner tank or the electrode activation tank, when the anode group and the cathode group are arranged in the electrode activation tank, the anode group is positioned in the first activation tank and is used for being connected with a power supply negative electrode, and the cathode group is positioned in the second activation tank and is used for being connected with a power supply positive electrode.

In some implementations, at least one electrode support member is disposed in the reaction inner tank, the electrode support member is provided with a plurality of insulation blocks distributed at intervals along a length direction, a gap is formed between every two adjacent insulation blocks, each of the anode group and the cathode group includes a connection plate and a plurality of electrodes arranged at intervals on the connection plate, the connection plate is used for connecting a power supply, the connection plate of the anode group and the connection plate of the cathode group are distributed at two sides of the electrode support member, and the electrodes of the anode group and the electrodes of the cathode group are alternately embedded in the gap.

In combination with the above implementation manner, in some implementations of the utility model, the connecting plate has a vertical plate and a horizontal plate, the horizontal plate is connected to the top of the vertical plate to form an L-shaped structure, the horizontal plate extends out of the reaction inner tank, the top of the horizontal plate is provided with an electric connecting post, the electrodes are arranged on the side of the vertical plate at intervals along the length direction of the horizontal plate, the vertical plate is provided with a plurality of second discharge ports between the horizontal plate and the electrodes, and the second discharge ports are arranged at intervals along the length direction of the horizontal plate.

In some implementations, the internal reaction tank is provided with two oppositely distributed electrode supporting parts, and two ends of the electrode of the anode group and the electrode of the cathode group are embedded in the gap between the two electrode supporting parts.

With reference to the foregoing implementation manners, in some implementation manners of the present invention, the electrochemical processing apparatus further includes at least one magnetic stirring device, the magnetic stirring device includes a magnetic stirrer and a magnetic rod, the magnetic rod is disposed in the reaction inner tank and is located below the electrode supporting member, and the magnetic stirrer is disposed at the bottom of the electrolytic reaction tank and is used for driving the magnetic rod to rotate.

With reference to the foregoing implementation manners, in some implementation manners of the present invention, the electrochemical processing apparatus includes a plurality of magnetic stirring apparatuses, the magnetic rods are disposed at intervals in the inner reaction tank, and a partition is disposed between two adjacent magnetic rods in the inner reaction tank.

In some implementations, the electrode activation slots are provided with activation inner slots, the peripheral walls of the activation inner slots are provided with notches, the activation inner slots are connected with the anion exchange membranes at the notches, the first activation slots are enclosed between the anion exchange membranes and the activation inner slots, and the second activation slots are formed outside the first activation slots in the electrode activation slots.

In some implementations, the activation inner tank is provided with a plurality of first stoppers at intervals along the length direction of the gap at the gap, the activation inner tank is provided with second stoppers corresponding to the first stoppers one by one, the anion exchange membrane is bent by the first stoppers and the second stoppers to form a plurality of first electrode mounting grooves and second electrode mounting grooves which are alternately distributed, the first electrode mounting grooves are communicated with the first activation grooves, and the second electrode mounting grooves are communicated with the second activation grooves.

In combination with the above implementations, in some implementations of the utility model, a height of a wall of the inner reaction tank is less than a height of a wall of the outer reaction tank.

In combination with the above implementations, in some implementations of the utility model, the electrodes of the cathode set and the connection plate of the cathode set are both made of stainless steel, and the electrodes of the anode set include oxide-coated titanium anodes, which are in a mesh structure.

One of the above technical solutions has at least one of the following advantages or beneficial effects: after the wastewater is electrolyzed in the reaction inner tank, the electrode assembly is transferred into the electrode activation tank from the reaction inner tank, and the activation treatment is carried out in a reverse electrode mode, so that organic matters adsorbed on the surface of the electrode of the anode group and metal scales deposited on the electrode of the cathode group are removed. The metal ions are prevented from entering the first activation groove from the second activation groove through the anion exchange membrane, the metal ions are prevented from being deposited on the electrode of the anode group again, the solution in the electrode activation groove can be recycled after multiple times of activation treatment, and the electrolytic effect of the electrode is guaranteed while the environment is protected.

Drawings

The utility model will be further described with reference to the accompanying drawings in which:

FIG. 1 is a schematic cross-sectional front view of one embodiment of the present invention;

FIG. 2 is a schematic top view of the embodiment of FIG. 1;

FIG. 3 is a schematic structural view of an electrode activation bath and an electrode support member according to one embodiment shown in FIG. 1;

FIG. 4 is a schematic diagram of the structure of the anode stack of FIG. 1 in accordance with one embodiment;

FIG. 5 is a schematic view showing the structure of the anode assembly placed in the reaction tank according to the embodiment shown in FIG. 1.

Detailed Description

Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.

In the present invention, if directions (up, down, left, right, front, and rear) are described, it is only for convenience of describing the technical solution of the present invention, and it is not intended or implied that the technical features referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, it is not to be construed as limiting the present invention.

In the utility model, the meaning of "a plurality" is one or more, the meaning of "a plurality" is more than two, and the terms of "more than", "less than", "more than" and the like are understood to exclude the number; the terms "above", "below", "within" and the like are understood to include the instant numbers. In the description of the present invention, if there is description of "first" and "second" only for the purpose of distinguishing technical features, it is not to be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the precedence of the indicated technical features.

In the present invention, unless otherwise specifically limited, the terms "disposed," "mounted," "connected," and the like are to be understood in a broad sense, and for example, may be directly connected or indirectly connected through an intermediate; can be fixedly connected, can also be detachably connected and can also be integrally formed; may be mechanically coupled, may be electrically coupled or may be capable of communicating with each other; either as communication within the two elements or as an interactive relationship of the two elements. The specific meaning of the above-mentioned words in the present invention can be reasonably determined by those skilled in the art in combination with the detailed contents of the technical solutions.

Referring to fig. 1 and 2, an embodiment of the present invention provides an electrochemical wastewater treatment apparatus including an electrolytic reaction tank, an electrode activation tank, and an electrode assembly. The electrolytic reaction tank comprises a reaction inner tank 11 and an outer tank 12 surrounding the reaction inner tank 11, wherein the reaction inner tank 11 is provided with a wastewater inlet 111 and a wastewater outlet 112. The outer tank 12 is used to receive overflow from the inner reaction tank 11, and it is understood that the overflow includes bubbles or slag generated during the electrolysis of the waste water. The outer tank 12 is provided with a first discharge port 121, and the waste water inlet 111, the waste water outlet 112 and the first discharge port 121 are all communicated with the outside. The foamed waste slag generated during the electrolysis can be discharged through the first discharge port 121 after flowing into the outer tank 12, so that the foamed waste slag can be effectively treated.

An anion exchange membrane 2 is arranged in the electrode activation groove 4, the anion exchange membrane 2 divides the electrode activation groove 4 into a first activation groove and a second activation groove, and electrolyte solution is put into the first activation groove and the second activation groove. The electrolyte solution may be, for example, 0.5mol/LNa2SO4, or may be other electrolyte solutions for activation treatment, which is not limited herein.

The electrode assembly includes an anode group 3 and a cathode group, both the anode group 3 and the cathode group being for being switchably disposed in the reaction inner tank 11 or the electrode activation tank 4. That is, the anode group 3 and the cathode group are both detachably installed in the reaction inner tank 11, and after the electrolytic reaction is completed, the anode group 3 and the cathode group are removed and placed in the electrode activation tank 4 for activation treatment. When the anode group 3 and the cathode group are arranged in the electrode activation tank 4, the anode group 3 is positioned in the first activation tank and is used for connecting the negative electrode of the power supply; the cathode group is positioned in the second activation groove and is used for being connected with the positive electrode of the power supply and carrying out activation treatment in a reverse electrode mode.

When the wastewater is treated, the anode group 3 and the cathode group are both placed in the reaction inner tank 11 for electrolytic reaction so as to oxidize and electrolyze reducing substances and organic matters in the wastewater, and simultaneously, part of metal ions in the wastewater are reduced and deposited on the surface of the cathode electrode, thereby achieving the purpose of reducing the concentration of the metal ions, the concentration of COD and the concentration of ammonia nitrogen in the wastewater.

After the wastewater is electrolyzed in the reaction inner tank 11, the electrode assembly is transferred from the reaction inner tank 11 to the electrode activation tank 4, and the activation treatment is carried out in a reverse electrode mode, so that organic matters adsorbed on the surface of the electrode of the anode group 3 are removed, metal scales deposited on the electrode of the cathode group are dissolved, the poisoning phenomenon of the electrode is delayed, and the electrolysis effect of the electrode is ensured. The metal ions are blocked by the anion exchange membrane 2 and enter the first activation groove from the second activation groove, so that the metal ions are prevented from being deposited on the electrode of the anode group 3 again, the solution in the electrode activation groove 4 can be recovered after multiple times of activation treatment, and the electrolytic effect of the electrode is ensured while the environment is protected.

Further, referring to fig. 3, at least one electrode supporting member 5 is disposed in the reaction inner tank 11, a plurality of insulating blocks 51 are disposed at intervals along the length direction of the electrode supporting member 5, and a gap is formed between two adjacent insulating blocks 51. The anode group 3 and the cathode group each include a connection plate 31 and a plurality of electrodes 32 disposed on the connection plate 31 at intervals, the connection plate 31 is used for connecting a power supply, that is, when the electrode assembly is located inside the reaction inner tank 11, the connection plate 31 of the anode group 3 is connected to a positive electrode of the power supply, and the connection plate 31 of the cathode group is connected to a negative electrode of the power supply, so as to perform electrolytic treatment on wastewater. The connecting plate 31 of the anode group 3 and the connecting plate 31 of the cathode group are oppositely distributed on two sides of the electrode 32 supporting part 5, the electrode 32 of the anode group 3 and the electrode 32 of the cathode group are alternately embedded in the gap, the electrode 32 is separated by the insulating stopper 51, and the short circuit problem caused by the contact of the electrode 32 of the anode group 3 and the electrode 32 of the cathode group can be effectively avoided.

Further, referring to fig. 4 and 5, the connecting plate 31 has a vertical plate 311 and a horizontal plate 312, and the horizontal plate 312 is connected to the top of the vertical plate 311 to form an L-shaped structure. The transverse plate 312 extends out of the reaction inner tank 11, and the top of the transverse plate 312 is provided with an electric connecting post 33 for connecting a power supply. The electrodes 32 are arranged at intervals on the side of the vertical plate 311 along the length direction of the transverse plate 312, the vertical plate 311 is provided with a plurality of second discharge ports 34 between the transverse plate 312 and the electrodes 32, and the second discharge ports 34 are arranged at intervals along the length direction of the transverse plate 312. The second discharge port 34 is used for discharging foam or slag, etc., and ensures that the foam or slag in the reaction inner tank 11 can overflow into the outer tank 12 through the second discharge port 34.

In some embodiments, referring to FIG. 5, the height of the walls of reaction inner tank 11 is less than the height of the walls of outer tank 12, ensuring that overflow can overflow into outer tank 12.

Referring to fig. 2, in some embodiments, two electrode supporting parts 5 are disposed in the reaction inner tank 11, and two ends of the electrode 32 of the anode set 3 and the electrode 32 of the cathode set are correspondingly embedded in the gap between the two electrode supporting parts 5, which is beneficial to improving the stability of the electrode assembly installation.

Further, referring to FIGS. 1 and 2, the electrochemical treatment apparatus further comprises at least one magnetic stirring device comprising a magnetic stirrer 61 and a magnetic rod 62, the magnetic rod 62 being disposed in the reaction inner tank 11 and located below the electrode supporting member 5. The magnetic stirrer 61 is arranged at the bottom of the electrolytic reaction tank and is used for driving the magnetic rod 62 to rotate, so that the stirring effect is achieved, the mass transfer effect of reactants is increased, and the electrolytic effect is improved.

Further, the electrochemical treatment apparatus includes a plurality of magnetic stirring apparatuses to enhance stirring efficiency. The magnetic rods 62 are arranged in the reaction inner tank 11 at intervals, and the reaction inner tank 11 is provided with a partition plate 63 between two adjacent magnetic rods 62, so that damage caused by touch is avoided.

Referring to fig. 3, in some embodiments, the electrode activation slot 4 is provided with an activation inner slot 41, a gap is formed in the peripheral wall of the activation inner slot 41, the activation inner slot 41 is connected with the anion exchange membrane 2 at the gap, a first activation slot is enclosed between the anion exchange membrane 2 and the activation inner slot 41, and a second activation slot is formed outside the first activation slot in the electrode activation slot 4. After the electrode 32 is activated for multiple times, the content of metal ions in the second activation tank is higher and higher, and after the metal ions reach a certain concentration, the metal ions are conveniently recovered from the second activation tank.

Further, referring to fig. 3, the activation inner groove 41 is provided with a plurality of first stoppers 43 at intervals along the length direction of the notch, and the activation inner groove 41 is provided with second stoppers 44 corresponding to the first stoppers 43 one to one. The anion exchange membrane 2 is bent by the first limiting block 43 and the second limiting block 44 to form a plurality of first electrode mounting grooves 451 and second electrode mounting grooves 452 which are alternately distributed, the first electrode mounting grooves 451 are communicated with the first activation grooves, and the second electrode mounting grooves 452 are communicated with the second activation grooves. When carrying out activation treatment to electrode subassembly, the electrode 32 of positive pole group 3 corresponds in the embedding first electrode mounting groove 451, and the electrode 32 of negative pole group corresponds in the embedding second electrode mounting groove 452, is favorable to practicing thrift the space, optimizes spatial layout, and can realize fast fixedly, makes things convenient for the dismouting.

In some embodiments, the electrodes 32 of the cathode set and the connecting plates 31 of the cathode set are made of stainless steel, so that the conductivity is better, and the power consumption can be reduced. The electrodes 32 of the anode group 3 comprise oxide coated titanium anodes having a high oxygen evolution potential and capable of electrolyzing reducing agents or organic substances in the wastewater. The titanium anode with the oxide coating is of a net structure, and the net structure can increase the reaction area and improve the electrolysis effect.

In the description herein, references to the description of the term "example," "an embodiment," or "some embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The utility model is not limited to the above embodiments, and those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the utility model, and such equivalent modifications or substitutions are included in the scope defined by the claims of the present application.

Claims (10)

1. An apparatus for electrochemical treatment of wastewater, comprising:

the electrolytic reaction tank comprises a reaction inner tank and an outer tank surrounding the reaction inner tank, the reaction inner tank is provided with a wastewater inlet and a wastewater outlet, the outer tank is used for receiving overflow materials overflowing from the reaction inner tank, the outer tank is provided with a first discharge port, and the wastewater inlet, the wastewater outlet and the first discharge port are all communicated with the outside; the electrode activation tank is internally provided with an anion exchange membrane, the anion exchange membrane divides the electrode activation tank into a first activation tank and a second activation tank, and electrolyte solution is put into the first activation tank and the second activation tank; and the electrode assembly comprises an anode group and a cathode group, the anode group and the cathode group are both used for being switchably arranged in the reaction inner tank or the electrode activation tank, when the anode group and the cathode group are arranged in the electrode activation tank, the anode group is positioned in the first activation tank and is used for being connected with a power supply negative electrode, and the cathode group is positioned in the second activation tank and is used for being connected with a power supply positive electrode.

2. The electrochemical wastewater treatment apparatus according to claim 1, wherein: the reaction internal groove is internally provided with at least one electrode supporting part, the electrode supporting part is provided with a plurality of insulating blocks distributed at intervals along the length direction, a gap is formed between every two adjacent insulating blocks, the anode group and the cathode group respectively comprise a connecting plate and a plurality of electrodes arranged on the connecting plate at intervals, the connecting plate is used for being connected with a power supply, the connecting plate of the anode group and the connecting plate of the cathode group are oppositely distributed on two sides of the electrode supporting part, and the electrodes of the anode group and the electrodes of the cathode group are alternately embedded in the gap.

3. The electrochemical wastewater treatment apparatus according to claim 2, wherein: the connecting plate is provided with a vertical plate and a transverse plate, the transverse plate is connected to the top of the vertical plate to form an L-shaped structure, the transverse plate extends out of the reaction inner groove, the top of the transverse plate is provided with an electric connecting column, the electrodes are arranged on the side edge of the vertical plate at intervals along the length direction of the transverse plate, a plurality of second discharge ports are arranged between the vertical plate and the electrodes, and the second discharge ports are arranged at intervals along the length direction of the transverse plate.

4. The electrochemical wastewater treatment apparatus according to claim 2, wherein: the reaction inner tank is internally provided with two oppositely distributed electrode supporting parts, and two ends of the electrode of the anode group and the electrode of the cathode group are correspondingly embedded in the gap of the two electrode supporting parts.

5. The electrochemical wastewater treatment apparatus according to claim 2, wherein: the electrochemical treatment device also comprises at least one magnetic stirring device, wherein the magnetic stirring device comprises a magnetic stirrer and a magnetic rod, the magnetic rod is arranged in the reaction inner tank and is positioned below the electrode supporting part, and the magnetic stirrer is arranged at the bottom of the electrolytic reaction tank and is used for driving the magnetic rod to rotate.

6. The electrochemical wastewater treatment apparatus according to claim 5, wherein: the electrochemical treatment device comprises a plurality of magnetic stirring devices, the magnetic rods are arranged in the reaction inner groove at intervals, and a partition plate is arranged between every two adjacent magnetic rods in the reaction inner groove.

7. The electrochemical wastewater treatment apparatus according to claim 2, wherein: the electrode activation tank is internally provided with an activation inner tank, the peripheral wall of the activation inner tank is provided with a notch, the activation inner tank is connected with the anion exchange membrane at the notch, the first activation tank is enclosed between the anion exchange membrane and the activation inner tank, and the electrode activation tank is provided with the second activation tank outside the first activation tank.

8. The electrochemical wastewater treatment apparatus according to claim 7, wherein: the activation inside groove in breach department is equipped with a plurality of edges the length direction interval of breach sets up first stopper, be equipped with in the activation inside groove with the second stopper of first stopper one-to-one, anion exchange membrane passes through first stopper with the second stopper is buckled and is formed a plurality of first electrode mounting grooves and the second electrode mounting groove of distributing in turn, first electrode mounting groove with first activation groove intercommunication, the second electrode mounting groove with second activation groove intercommunication.

9. The electrochemical wastewater treatment apparatus according to claim 1, wherein: the height of the groove wall of the inner reaction groove is smaller than that of the outer groove.

10. The electrochemical wastewater treatment apparatus according to claim 2, wherein: the electrode of the cathode group and the connecting plate of the cathode group are both made of stainless steel, the electrode of the anode group comprises an oxide coating titanium anode, and the oxide coating titanium anode is of a net structure.

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