Electro-Fenton device for treating high-concentration wastewater based on high-voltage electrolysis

Abstract

The utility model relates to an electro-Fenton device for treating high-concentration wastewater based on high-voltage electrolysis, which comprises a treating pond, a power supply, an acid adding system and a hydrogen peroxide adding system, and a front pH adjusting area, an electro-Fenton reaction area and a mud-water separation area are sequentially arranged in the treating pond from one end to the other end; the upper portions of the side walls of the front pH adjusting area, the electro-Fenton reaction area and the mud-water separation area are communicated in sequence, iron polar plates are arranged at the two ends in the electro-Fenton reaction area respectively, a plurality of sub-polar plates are arranged between the two iron polar plates at intervals, the iron polar plates and the sub-polar plates between the adjacent sub-polar plates are separated, the two iron polar plates are connected with a power source through lines respectively, and the power source is connected with the mud-water separation area. The acid adding system is used for adding acid into the electro-Fenton reaction zone, a first sludge discharge port is formed in the bottom of the electro-Fenton reaction zone, and the hydrogen peroxide adding system is used for adding hydrogen peroxide into the front pH adjusting zone. The device has the advantages that the pH value in the electro-Fenton reaction zone can be maintained in a Fenton reaction demand value range through the acid adding system, and the oxidation efficiency is greatly improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to wastewater treatment technical field especially relates to a kind of electric fenton device based on high-pressure electrolysis processing high concentration wastewater. BACKGROUND

[0002] COD, organic phosphorus and other pollutants in high-salinity, high-concentration wastewater cannot be treated by biological method, and cannot be directly evaporated by evaporation method, and need to be oxidized by advanced oxidation method, and the advanced oxidation method currently used, such as Fenton reaction, ozone oxidation, electro-catalytic oxidation, wet catalytic oxidation, these oxidation processes all have problems of low oxidation efficiency, high equipment cost and high operating cost.

[0003] More specifically, the existing electro-catalytic oxidation technology outputs large current, resulting in a large amount of ferrous ions generated during the reaction, a large amount of sludge generated, high processing cost, and difficult separation of sludge and water; at the same time, large output current will lead to fast consumption of hydrogen ions, rapid rise of pH value, and difficulty in stable achievement of Fenton reaction; in addition, when the existing electro-catalytic oxidation technology processes large water volume, the current is very large, which requires larger output power supply and power transmission conductor, high equipment cost and high operating cost. In addition, the existing Fenton reaction has limited oxidation effect, high operating cost and high sludge yield. The existing ozone oxidation has low oxidation efficiency, high equipment cost and high operating cost. The existing wet catalytic oxidation has high equipment cost, high operating cost and catalyst poisoning.

[0004] Therefore, it is necessary to develop an electric Fenton device based on high-pressure electrolysis for processing high-concentration wastewater to overcome the above technical problems. SUMMARY

[0005] The utility model solves the technical problem of providing an electric Fenton device based on high-pressure electrolysis for processing high-concentration wastewater, which effectively overcomes the defects of the prior art.

[0006] The technical solution of the utility model to solve the above technical problems is as follows:

[0007] The utility model relates to a kind of electrofenton device based on high-pressure electrolysis processing high concentration wastewater, including treatment pool, power supply, acid adding system and hydrogen peroxide adding system, the treatment pool is sequentially provided with front pH adjustment area, electrofenton reaction zone and sludge-water separation zone from one end to the other end, the side wall upper portion of above-mentioned front pH adjustment area, electrofenton reaction zone and sludge-water separation zone is sequentially communicated by medium passage, the both ends in above-mentioned electrofenton reaction zone are respectively equipped with iron electrode plate, multiple sub-electrode plates are spaced apart between two above-mentioned iron electrode plate, adjacent above-mentioned sub-electrode plate and between above-mentioned iron electrode plate and sub-electrode plate are connected and separated by insulating partition, two above-mentioned iron electrode plate is connected above-mentioned power supply by line, above-mentioned acid adding system is used to add acid in above-mentioned electrofenton reaction zone, the bottom of above-mentioned electrofenton reaction zone is equipped with first sludge discharge port, above-mentioned hydrogen peroxide adding system is used to add hydrogen peroxide in above-mentioned front pH adjustment area.

[0008] On the basis of the above technical solution, the utility model can also be improved as follows.

[0009] Further, a first stirring mechanism is arranged in the front pH adjustment area, and the acid adding system is further used to add acid into the front pH adjustment area.

[0010] Further, a first aeration assembly is arranged below the two iron electrode plates and connected to the airflow conveying device by a pipeline.

[0011] Further, a rear pH adjustment area, a coagulation reaction zone and a sedimentation zone are sequentially arranged in the sludge-water separation zone from one end to the other end, the upper portion of the side wall of the rear pH adjustment area is sequentially communicated with the upper portion of the side wall of the electrofenton reaction zone by a medium passage, the upper portion of the side wall of the rear pH adjustment area, the coagulation reaction zone and the sedimentation zone is sequentially communicated by a medium passage, and the bottom of the sedimentation zone is provided with a second sludge discharge port, and the upper portion of the side wall of the sedimentation zone is provided with a drain port.

[0012] Further, a PAM adding system is connected to the coagulation reaction zone by a pipeline, and a second stirring mechanism is arranged in the coagulation reaction zone.

[0013] Further, an alkali adding system is arranged in the rear pH adjustment area.

[0014] Further, a second aeration assembly is arranged in the lower portion of the rear pH adjustment area, and the second aeration assembly is connected to the airflow conveying device by a pipeline.

[0015] Further, an electrostatic elimination structure is arranged in the medium passage between the front pH adjustment area and the electrofenton reaction zone and the medium passage between the electrofenton reaction zone and the rear pH adjustment area.

[0016] Furthermore, the power supply is a high-frequency pulsed DC power supply, which is connected to the two iron plates via a control terminal.

[0017] Furthermore, the aforementioned acid addition system includes an acid container and a pump body. The pump body is connected to the inner cavity of the acid container via a pipeline, and the pump body and the power supply are respectively connected to a control terminal.

[0018] The beneficial effects of this utility model are: the structure is simple and reasonable, and the acid addition system can add acid to the electro-Fenton reaction zone and maintain the pH value in the electro-Fenton reaction zone within the range required by the Fenton reaction. By using the combination technology of electrolysis and Fenton, the oxidation efficiency is greatly improved. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the electro-Fenton device for treating high-concentration wastewater based on high-voltage electrolysis according to this utility model.

[0020] The attached diagram lists the components represented by each number as follows:

[0021] 1. Pre-pH adjustment zone; 2. Electro-Fenton reaction zone; 3. Sludge-water separation zone; 4. Iron electrode plate; 5. Separating electrode plate; 6. First aeration component; 8. Second aeration component; 31. Post-pH adjustment zone; 32. Coagulation reaction zone; 33. Sedimentation zone. Detailed Implementation

[0022] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0023] Example

[0024] like Figure 1 As shown, the electro-Fenton device for treating high-concentration wastewater based on high-voltage electrolysis in this embodiment includes a treatment tank, a power supply, an acid addition system (represented by E in the figure), and a hydrogen peroxide addition system. The treatment tank is provided with a pre-pH adjustment zone 1, an electro-Fenton reaction zone 2, and a sludge-water separation zone 3 sequentially from one end to the other. The upper sidewalls of the pre-pH adjustment zone 1, the electro-Fenton reaction zone 2, and the sludge-water separation zone 3 are sequentially connected through a medium channel. Iron electrode plates 4 are respectively provided at both ends inside the electro-Fenton reaction zone 2. Multiple separator plates 5 are provided between two iron electrode plates 4. Adjacent separator plates 5 and iron electrode plates 4 and separator plates 5 are connected and separated by insulating partitions. Two iron electrode plates 4 are respectively connected to the power supply through lines. The acid addition system is used to add acid to the electro-Fenton reaction zone 2. The bottom of the electro-Fenton reaction zone 2 is provided with a first sludge discharge port. The hydrogen peroxide addition system (represented by F in the figure) is used to add hydrogen peroxide to the pre-pH adjustment zone 1.

[0025] The high-pressure electrolysis-based electro-Fenton device for treating high-concentration wastewater in the embodiment has the following advantages during the treatment process: + The high-pressure electrolysis-based electro-Fenton device for treating high-concentration wastewater in the embodiment has the following advantages during the treatment process:

[0026] The high-pressure electrolysis-based electro-Fenton device for treating high-concentration wastewater in the embodiment has the following advantages during the treatment process:

[0027] 1) The energy consumption is lower than that of the existing electro-catalytic oxidation, and the output current is 1 / 20 of that of the existing technology, and the power consumption is 1 / 5 of that of the existing technology;

[0028] 2) The sludge yield is less than that of the existing electro-catalytic oxidation, and the generated ferrous ions are less, and the output current is 1 / 20 of that of the existing technology, and the sludge yield is 1 / 20 of that of the existing technology;

[0029] 3) The device can maintain stable Fenton reaction conditions, and the intelligent acid adding system can maintain the continuous operation of the electro-Fenton reaction, and the treatment effect is good;

[0030] 4) Compared with the Fenton reaction, the device is a combination of electrolysis and Fenton, and the oxidation efficiency is higher, which is more than 30% higher than that of the Fenton reaction;

[0031] 5) Compared with the Fenton reaction, the sludge yield is reduced by 2 / 3, the hydrogen peroxide usage is reduced by 1 / 3, and the total operating cost is reduced by 20%.

[0032] In the embodiment, the first stirring mechanism is arranged in the front pH adjusting area 1, and the acid adding system is used to add acid into the front pH adjusting area 1. During the process of adding hydrogen peroxide and / or acid, the first stirring mechanism is used to stir and accelerate the adjustment efficiency of the pH value in the front pH adjusting area 1.

[0033] It should be noted that the first stirring mechanism comprises a vertical first stirring shaft and horizontal stirring rods arranged on the first stirring shaft, the first stirring shaft extends into the front pH adjusting area 1, and the upper end is connected with a first motor (the first motor is arranged on the upper end of the treatment tank through a support).

[0034] In the embodiment, the second sludge discharge port is arranged at the bottom of the electro-Fenton reaction area 2, and part of the sludge generated in the Fenton reaction process is deposited at the bottom and discharged through the second sludge discharge port.

[0035] In the embodiment, the hydrogen peroxide adding system comprises a hydrogen peroxide adding pump and a hydrogen peroxide liquid tank, the inlet of the hydrogen peroxide adding pump is connected with a pipeline extending into the hydrogen peroxide liquid tank, and the outlet of the hydrogen peroxide adding pump is connected with a pipeline extending into the front pH adjusting area 1. A pH detector (a product of the prior art, which is not described here) for detecting the pH value in real time can be arranged in the front pH adjusting area 1.

[0036] As a preferred embodiment, the first aeration assembly 6 is arranged below the two iron electrodes 4 and connected with the air flow conveying device (denoted as B in the figure) through a pipeline.

[0037] In the embodiment, the air flow conveying device supplies the first aeration assembly 6 with air flow, which is blown upward through the first aeration assembly 6 and sweeps the iron electrodes 4 and the division electrodes 5. The reason is that in the Fenton reaction process, calcium and iron ions are released from the anode, and ferrous ions are generated in the reaction, and the cathode is easy to accumulate and adhere to sludge. Through aeration and sweeping, the sludge adhered to the surface of the cathode can be removed, and the cathode can be prevented from failing.

[0038] In the embodiment, the air flow conveying device can be a fan, and the first aeration assembly 6 can be a conventional aeration pipeline.

[0039] In the embodiment, in the running process, the anode and the cathode are alternated, specifically, one of the iron electrodes 4 is used as an anode, and the other is used as a cathode, and the current is output, and the aeration and sweeping are performed. After a certain period of operation, the current is reversely output (that is, the anode and the cathode are exchanged), and the aeration is performed. The alternating circulation ensures the effective and continuous operation of the Fenton reaction.

[0040] As a preferred embodiment, the sludge-water separation zone 3 is sequentially provided with a post pH adjustment zone 31, a coagulation reaction zone 32 and a sedimentation zone 33 from one end to the other end. The upper side wall of the post pH adjustment zone 31 is sequentially communicated with the upper side wall of the electro-Fenton reaction zone 2 through a medium passage. The upper side wall of the post pH adjustment zone 31, the coagulation reaction zone 32 and the sedimentation zone 33 are sequentially communicated through a medium passage. The bottom of the sedimentation zone 33 is provided with a second sludge discharge port, and the upper side wall thereof is provided with a water discharge port.

[0041] In the above embodiment, the wastewater treated by the Fenton reaction first enters the post pH adjustment zone 31, and the pH value of the wastewater is adjusted to 8 by adding an alkaline substance. Then, the wastewater enters the coagulation reaction zone 32, PAM is added, and the wastewater is uniformly mixed to cause flocculation. Then, the wastewater enters the sedimentation zone 33 for sedimentation to realize separation of sludge and water. The separated water is discharged, and the sludge is discharged through the first sludge discharge port at the bottom.

[0042] As a preferred embodiment, a PAM adding system is further included. The PAM adding system is connected with a pipeline leading into the coagulation reaction zone 32. The coagulation reaction zone 32 is provided with a second stirring mechanism.

[0043] In the above embodiment, the PAM adding system (denoted by H in the figure) can automatically add PAM material to the coagulation reaction zone 32, fully perform flocculation, and ensure effective separation of sludge and water.

[0044] The second stirring mechanism can adopt the same product as the first stirring mechanism.

[0045] In the present embodiment, the PAM adding system can adopt a conventional PAM powder adding system or a PAM liquid adding system (such as a combination of a pump body and a PAM liquid preparation tank. The pump body draws PAM liquid in the PAM liquid preparation tank and pumps it into the coagulation reaction zone 32).

[0046] As a preferred embodiment, an alkali adding system (denoted by G in the figure) is further included. The alkali adding system is used to add alkali liquid to the post pH adjustment zone 31.

[0047] In the above embodiment, the alkali adding system can automatically add alkaline material or alkali liquid to the post pH adjustment zone 31 to realize neutralization and adjustment of the pH value.

[0048] The alkali adding system can adopt a conventional powder adding system or an alkali liquid adding system (such as a combination of a pump body and an alkali liquid preparation tank. The pump body draws alkali liquid in the alkali liquid preparation tank and pumps it into the post pH adjustment zone 31).

[0049] As a preferred embodiment, the second aeration assembly 8 is arranged in the lower part of the post pH adjustment zone 31 and connected with the airflow conveying device through a pipeline.

[0050] In the above embodiment, the second aeration assembly 8 is arranged in the post pH adjustment zone 31 to promote the mixing of the alkaline substance and the wastewater in the post pH adjustment zone 31.

[0051] In the embodiment, the second aeration assembly 8 can be a conventional aeration pipeline.

[0052] In the embodiment, the medium channels connecting the pre pH adjustment zone 1 and the electro-Fenton reaction zone 2 and the medium channels connecting the electro-Fenton reaction zone 2 and the post pH adjustment zone 31 are respectively provided with electrostatic elimination structures (denoted as C in the figure). The electrostatic elimination structures can prevent static electricity generated in the electro-Fenton reaction zone 2 from entering the pre pH adjustment zone 1 and the post pH adjustment zone 31.

[0053] In the embodiment, the power supply is a high-frequency pulse direct-current power supply, and the power supply is connected with the two iron plates 4 through a control terminal. The control terminal is a conventional PLC control system, which can switch the direction of the current and adjust the output of the current.

[0054] As a preferred embodiment, the acid adding system comprises an acid container and a pump body, the pump body is connected with the inner cavity of the acid container through a pipeline, and the pump body and the power supply are respectively connected with a control terminal (denoted as A in the figure).

[0055] In the above embodiment, the pump body and the power supply are connected with the same control terminal, and the amount of the acid liquid conveyed by the pump body is adaptively adjusted according to the size of the current (for example, when the current is large, the H+ ion consumption is large, and the amount of the acid liquid added is large, and vice versa, the amount of the acid liquid added is reduced), and the specific adjustment parameters are flexibly set according to the actual requirements, which will not be described here. The acid adding system is intelligent as a whole, and the pH value in the electro-Fenton reaction zone 2 is stably maintained at the pH value required by the Fenton reaction (between 2 and 3).

[0056] In the description of the utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0057] In addition, the terms "first", "second", "third", etc. are used only for descriptive purposes and do not connote or imply any relative importance or any meaning pertaining to the quantity of the features being described. Thus, a feature defined with "first", "second", etc. can include at least one of the features, explicitly or implicitly. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless specifically defined otherwise.

[0058] In the present application, unless specifically defined and limited otherwise, the terms "mounting", "connecting", "connection", "fixing" and the like should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship of two elements, unless specifically defined otherwise. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0059] In the present application, unless specifically defined and limited otherwise, the first feature is "on" or "under" the second feature. The first and second features can be in direct contact, or the first and second features can be indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is lower than that of the second feature.

[0060] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms is not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or features of different embodiments or examples described in the present application without contradiction.

[0061] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. Those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. An electro-Fenton device for treating high concentration wastewater based on high pressure electrolysis, characterized by: The application relates to an electro-Fenton reaction device, which comprises a treatment tank, a power supply, an acid adding system and a hydrogen peroxide adding system, wherein a front pH adjusting area (1), an electro-Fenton reaction area (2) and a sludge-water separation area (3) are sequentially arranged in the treatment tank from one end to the other end; the upper parts of the side walls of the front pH adjusting area (1), the electro-Fenton reaction area (2) and the sludge-water separation area (3) are sequentially connected through medium channels; two iron electrode plates (4) are arranged at the two ends of the electro-Fenton reaction area (2) respectively; a plurality of sub-electrode plates (5) are arranged between the two iron electrode plates (4) at intervals; the adjacent sub-electrode plates (5) and the iron electrode plates (4) and the sub-electrode plates (5) are connected and separated through insulating partitions; the two iron electrode plates (4) are connected with the power supply through lines; the acid adding system is used for adding acid into the electro-Fenton reaction area (2); a first sludge discharge port is arranged at the bottom of the electro-Fenton reaction area (2); and the hydrogen peroxide adding system is used for adding hydrogen peroxide into the front pH adjusting area (1).

2. The electro-Fenton device for treating high-concentration wastewater based on high-voltage electrolysis according to claim 1, characterized in that: A first stirring mechanism is arranged in the front pH adjusting area (1), and the acid adding system is also used for adding acid into the front pH adjusting area (1).

3. The electro-Fenton device for treating high concentration wastewater based on high-voltage electrolysis according to claim 1, characterized in that: A first aeration assembly (6) is arranged below the two iron electrode plates (4) and connected with an air flow conveying device through a pipeline.

4. The electro-Fenton device for treating high-concentration wastewater by high-voltage electrolysis according to claim 3, characterized in that: A rear pH adjusting area (31), a coagulation reaction area (32) and a sedimentation area (33) are sequentially arranged in the sludge-water separation area (3) from one end to the other end; the upper part of the side wall of the rear pH adjusting area (31) is sequentially connected with the upper part of the side wall of the electro-Fenton reaction area (2) through a medium channel; the upper parts of the side walls of the rear pH adjusting area (31), the coagulation reaction area (32) and the sedimentation area (33) are sequentially connected through medium channels; a second sludge discharge port is arranged at the bottom of the sedimentation area (33), and a water discharge port is arranged at the upper part of the side wall of the sedimentation area (33).

5. The electro-Fenton device for treating high concentration wastewater based on high-voltage electrolysis according to claim 4, characterized in that: A PAM adding system is further arranged and connected with a pipeline leading into the coagulation reaction area (32); and a second stirring mechanism is arranged in the coagulation reaction area (32).

6. The electro-Fenton device for treating high concentration wastewater by high voltage electrolysis according to claim 4, characterized in that: An alkali adding system is further arranged and used for adding alkali liquor into the rear pH adjusting area (31).

7. The electro-Fenton device for treating high concentration wastewater based on high-voltage electrolysis according to claim 6, characterized in that: A second aeration assembly (8) is arranged in the lower part of the rear pH adjusting area (31) and connected with an air flow conveying device through a pipeline.

8. The electro-Fenton device for treating high concentration wastewater by high voltage electrolysis according to claim 4, characterized in that: The medium channels connecting the front pH adjusting area (1) and the electro-Fenton reaction area (2) and the medium channels connecting the electro-Fenton reaction area (2) and the rear pH adjusting area (31) are respectively provided with electrostatic elimination structures.

9. The electro-Fenton device for treating high concentration wastewater based on high-voltage electrolysis according to any one of claims 1 to 8, characterized in that: The power supply is a high-frequency pulse direct-current power supply, and the power supply is connected with the two iron electrode plates (4) through a control terminal.

10. The electro-Fenton device for treating high concentration wastewater based on high-voltage electrolysis according to claim 9, characterized in that: The acid adding system comprises an acid liquid container and a pump body, the pump body is connected with the inner cavity of the acid liquid container through a pipeline, and the pump body and the power supply are respectively connected with a control terminal.

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