Wastewater treatment equipment containing metal ions and organic matter

Abstract

This utility model relates to the field of wastewater treatment technology, and more particularly to a wastewater treatment device containing metal ions and organic matter. The device includes a primary treatment unit and a secondary treatment unit. The primary treatment unit contains a first anode plate and a first cathode plate, with the first anode plate having a potential of A. The inlet of the secondary treatment unit is connected to the outlet of the primary treatment unit. The secondary treatment unit contains a second anode plate and a second cathode plate, with the second anode plate having a potential of B. This utility model, through the primary and secondary treatment units, enables the graded precipitation and recovery of metals, the graded degradation of organic matter, and the graded reduction of COD in wastewater, thereby improving the treatment efficiency of metals and organic matter in wastewater, thoroughly recovering metal ions, and fully degrading organic matter in the wastewater.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to a wastewater treatment device containing metal ions and organic matter. Background Technology

[0002] Wastewater containing metal ions and organic matter is a complex and difficult-to-biodegrade industrial or domestic pollutant. Its treatment process is quite complex, requiring a balance between metal ion recovery (i.e., reducing free metal ions to elemental metals via electrochemical reduction) and organic matter degradation. Simultaneously, it's crucial to prevent secondary pollution during treatment. Furthermore, the large amount of sludge generated during the process is extremely difficult to manage. Therefore, we urgently need a wastewater treatment device containing metal ions and organic matter.

[0003] Currently, the treatment method for wastewater containing metal ions and organic matter is the anodic electro-oxidation method, which directly treats the wastewater. This method results in the incomplete recovery of metals (e.g., copper and silver coexisting) and incomplete treatment of organic matter in the wastewater. Wastewater treated in this way has neither sufficient recovery value nor meets discharge standards. Utility Model Content

[0004] In response to the shortcomings of the existing production technology, the applicant provides a wastewater treatment device containing metal ions and organic matter. By improving the structure of the wastewater treatment device containing metal ions and organic matter, the treatment effect of metals and organic matter in wastewater is improved, so as to completely recover metal ions and fully degrade organic matter in wastewater.

[0005] The technical solution adopted in this utility model is as follows:

[0006] A wastewater treatment device containing metal ions and organic matter includes: a primary treatment unit and a secondary treatment unit. The primary treatment unit has a first anode plate and a first cathode plate internally. The potential of the first anode plate is A. The primary treatment unit is used for initial precipitation of metals, initial degradation of organic matter, and initial reduction of COD in the wastewater. The inlet end of the secondary treatment unit is connected to the outlet end of the primary treatment unit. The secondary treatment unit has a second anode plate and a second cathode plate internally. The potential of the second anode plate is B. The secondary treatment unit is used for further precipitation of metals, further degradation of organic matter, and further reduction of COD in the wastewater. Wherein, potential A is less than potential B.

[0007] Therefore, by performing metal precipitation, organic matter degradation, and COD reduction in wastewater twice through primary and secondary treatment units, this treatment method is simpler in structure and easier to operate compared to existing anodic electro-oxidation methods. It can achieve graded precipitation and recycling of metals, graded degradation of organic matter, and graded reduction of wastewater COD, thereby improving the treatment effect of metals and organic matter in wastewater, thoroughly recovering metal ions and fully degrading organic matter in wastewater. In addition, the entire wastewater treatment process only changes the potential of the first and second anode plates without adding any chemical agents. It can also precipitate different metals through the potential difference between the first and second anode plates, thereby achieving high-purity recovery of metals from wastewater.

[0008] As a further improvement to the above technical solution: multiple first anode plates and multiple first cathode plates are provided, and the number of first anode plates is equal to the number of first cathode plates; multiple first anode plates are arranged sequentially at equal intervals, and multiple first cathode plates are arranged sequentially at equal intervals, with the first anode plates and first cathode plates being staggered. Therefore, through the mutual cooperation of multiple first anode plates and multiple first cathode plates, the efficiency and effect of initial metal precipitation, the efficiency and effect of initial organic matter degradation, and the efficiency and effect of initial reduction of COD in wastewater can be improved.

[0009] As a further improvement to the above technical solution: multiple second anode plates and multiple second cathode plates are provided, and the number of second anode plates is equal to the number of second cathode plates; multiple second anode plates are arranged sequentially at equal intervals, and multiple second cathode plates are arranged sequentially at equal intervals, with the second anode plates and second cathode plates staggered. Therefore, through the cooperation of multiple second anode plates and multiple second cathode plates, the efficiency and effect of re-precipitating metals, the efficiency and effect of re-degrading organic matter, and the efficiency and effect of further reducing the COD of wastewater can be improved.

[0010] As a further improvement to the above technical solution, it also includes: a first bag filter and a second bag filter, wherein the outlet end of the first bag filter is connected to the inlet end of the primary treatment unit, and the inlet end of the second bag filter is connected to the outlet end of the secondary treatment unit. Thus, the first bag filter is used to filter solid impurities insoluble in the wastewater before treatment, facilitating subsequent wastewater treatment; the second bag filter is used to filter solid impurities generated during wastewater treatment (electrolysis), facilitating the transport of the treated liquid.

[0011] As a further improvement to the above technical solution, it also includes: a first connecting pipe, a second connecting pipe, and a third connecting pipe. The outlet end of the first bag filter is connected to the inlet end of the primary treatment unit through the first connecting pipe; the outlet end of the primary treatment unit is connected to the inlet end of the secondary treatment unit through the second connecting pipe; and the inlet end of the second bag filter is connected to the outlet end of the secondary treatment unit through the third connecting pipe. A first pump and a flow meter are connected in series in the first connecting pipe. The first pump is installed on the side wall of the first bag filter. A second pump is connected in series in the second connecting pipe and is installed on the side wall of the primary treatment unit. A third pump is connected in series in the third connecting pipe and is installed on the side wall of the secondary treatment unit. Thus, the first, second, and third pumps serve as power sources, causing wastewater to flow sequentially through the first bag filter, the primary treatment unit, the secondary treatment unit, and the second bag filter. The flow meter can detect the flow rate of the wastewater before treatment and compare it with the flow rate of the treated liquid to calculate the content of metals and organic matter in the wastewater.

[0012] As a further improvement to the above technical solution: the primary treatment mechanism includes a first treatment chamber and a first cover plate, the first treatment chamber being connected to the first cover plate, and the first anode plate and the first cathode plate being installed in the first treatment chamber; a plurality of first nozzles are provided on the side of the first cover plate near the first treatment chamber, and the first cover plate has a first through hole; a plurality of first drain pipes are provided on the side of the first treatment chamber away from the first cover plate, and a first valve is installed on the first drain pipe. Thus, by opening the first cover plate, the metal element deposited and attached to the first cathode plate can be scraped off and recycled; the water sprayed from the first nozzles can act on the first treatment chamber after wastewater treatment to flush away impurities in the first treatment chamber; the first through hole allows for the discharge of gas during wastewater electrolysis; opening the first valve allows impurities in the first treatment chamber to be discharged through the first drain pipe; furthermore, during wastewater treatment, wastewater can be sampled and tested through the first drain pipe to change the potential of the first anode plate, thereby achieving dynamic adjustment of the wastewater treatment process of the primary treatment mechanism.

[0013] As a further improvement to the above technical solution: multiple first grooves are provided on the side of the first anode plate and the first cathode plate away from the first cover plate. This allows wastewater to flow easily within the first treatment chamber via the first grooves.

[0014] As a further improvement to the above technical solution: the secondary treatment mechanism includes: a second treatment chamber and a second cover plate, the second treatment chamber being connected to the second cover plate, and the second anode plate and the second cathode plate being installed in the second treatment chamber; multiple second nozzles are provided on the side of the second cover plate near the second treatment chamber, and the second cover plate has second through holes; multiple second drain pipes are provided on the side of the second treatment chamber away from the second cover plate, and second valves are installed on the second drain pipes. Thus, by opening the second cover plate, the metal element deposited and attached to the second cathode plate can be scraped off and recycled; the water sprayed from the second nozzles can act on the second treatment chamber after wastewater treatment to flush away impurities in the second treatment chamber; the second through holes allow gas to be discharged during wastewater electrolysis; opening the second valves allows impurities in the second treatment chamber to be discharged through the second drain pipes; furthermore, during wastewater treatment, wastewater can be sampled and tested through the second drain pipes to change the potential of the second anode plate, thereby achieving dynamic adjustment of the wastewater treatment process of the secondary treatment mechanism.

[0015] As a further improvement to the above technical solution, multiple second grooves are provided on the side of the second anode plate and the second cathode plate away from the second cover plate. These second grooves facilitate the flow of wastewater within the second treatment chamber.

[0016] As a further improvement to the above technical solution, it also includes: an inlet pipe and an outlet pipe, wherein the inlet pipe is connected to the inlet end of the first bag filter, and the outlet pipe is connected to the outlet end of the second bag filter.

[0017] The beneficial effects of this utility model are as follows:

[0018] This treatment method employs a two-stage process—primary and secondary treatment units—to precipitate metals, degrade organic matter twice, and reduce COD in wastewater twice. Compared to existing anodic electro-oxidation methods, this approach is simpler in structure and easier to operate. It enables graded precipitation and recycling of metals, graded degradation of organic matter, and graded reduction of COD in wastewater, thereby improving the treatment efficiency of metals and organic matter in wastewater. This ensures the complete recovery of metal ions and the full degradation of organic matter in wastewater. Furthermore, the entire wastewater treatment process only requires changing the potential of the first and second anode plates without adding any chemical reagents. It can also precipitate different metals through the potential difference between the first and second anode plates, achieving high-purity metal recovery from wastewater.

[0019] This utility model also has the following advantages:

[0020] 1. The first bag filter of this utility model is used to filter solid impurities that are insoluble in wastewater before wastewater treatment, so as to facilitate subsequent wastewater treatment; the second bag filter is used to filter solid impurities generated during wastewater treatment (electrolysis), so as to facilitate the transportation of the treated liquid.

[0021] 2. This utility model allows for the scraping and recycling of the precipitated and attached elemental metals on the first cathode plate by opening the first cover plate; water sprayed from the first nozzle acts on the first treatment chamber after wastewater treatment to flush away impurities in the first treatment chamber; gas can be discharged during wastewater electrolysis through the first through hole; the first valve is opened to discharge impurities in the first treatment chamber through the first drain pipe; furthermore, during wastewater treatment, wastewater can be sampled and tested through the first drain pipe to change the potential of the first anode plate, thereby achieving dynamic adjustment of the wastewater treatment process of the primary treatment unit.

[0022] 3. This utility model allows for the scraping and recycling of the precipitated elemental metals adhering to the second cathode plate by opening the second cover plate; water sprayed from the second nozzle acts on the second treatment chamber after wastewater treatment to flush away impurities within the chamber; gas can be discharged during wastewater electrolysis through the second through hole; the second valve allows impurities in the second treatment chamber to be discharged through the second drain pipe. Furthermore, during wastewater treatment, wastewater can be sampled and tested through the second drain pipe to change the potential of the second anode plate, thereby achieving dynamic adjustment of the wastewater treatment process in the secondary treatment unit. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the wastewater treatment device containing metal ions and organic matter according to the present invention.

[0024] Figure 2 This is a top view of the wastewater treatment device containing metal ions and organic matter according to this utility model.

[0025] Figure 3 This is a cross-sectional view of the primary processing mechanism of this utility model;

[0026] Figure 4 This is a cross-sectional view of the secondary processing mechanism of this utility model.

[0027] Among them: 1. Primary processing unit;

[0028] 101. First anode plate; 102. First cathode plate; 103. First processing chamber; 104. First cover plate; 105. First nozzle; 106. First through hole; 107. First drain pipe; 108. First valve; 109. First groove;

[0029] 2. Secondary processing facility;

[0030] 201. Second anode plate; 202. Second cathode plate; 203. Second treatment chamber; 204. Second cover plate; 205. Second nozzle; 206. Second through hole; 207. Second drain pipe; 208. Second valve; 209. Second groove;

[0031] 3. First bag filter;

[0032] 4. Second bag filter;

[0033] 5. First connecting tube;

[0034] 501, First pump; 502, Flow meter;

[0035] 6. Second connecting pipe;

[0036] 601, Second Pump;

[0037] 7. Third connecting pipe;

[0038] 701, Third Pump;

[0039] 8. Liquid inlet pipe;

[0040] 9. Discharge pipe;

[0041] 10. Base. Detailed Implementation

[0042] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0043] like Figures 1 to 4The diagram shows the preferred embodiment of this utility model. This embodiment of the wastewater treatment device containing metal ions and organic matter includes: a primary treatment unit 1 and a secondary treatment unit 2. The primary treatment unit 1 is internally equipped with a first anode plate 101 and a first cathode plate 102. The potential of the first anode plate 101 is A. The primary treatment unit 1 is used for initial metal precipitation, initial degradation of organic matter, and initial reduction of the COD of the wastewater. The inlet end of the secondary treatment unit 2 is connected to the outlet end of the primary treatment unit 1. The secondary treatment unit 2 is internally equipped with a second anode plate 201 and a second cathode plate 202. The potential of the second anode plate 201 is B. The secondary treatment unit 2 is used for further metal precipitation, further degradation of organic matter, and further reduction of the COD of the wastewater; wherein, potential A is less than potential B. Therefore, by performing two metal precipitation treatments (i.e., the potential A is less than the potential B, so the purpose of these two metal precipitation treatments is to precipitate different types of metals), two organic matter degradation treatments (i.e., the purpose of these two degradation treatments is: the potential A decreases the degradation of easily degradable organic matter, and the potential B decreases the degradation of difficult-to-degrade organic matter), and two reductions in wastewater COD, this treatment method is simpler in structure and easier to operate than existing anodic electro-oxidation methods. It can achieve graded precipitation and recycling of metals, graded degradation of organic matter, and graded reduction of wastewater COD, thereby improving the treatment effect of metals and organic matter in wastewater, thoroughly recovering metal ions from wastewater, and fully degrading organic matter in wastewater. In addition, the entire wastewater treatment process only changes the potential of the first anode plate 101 and the second anode plate 201, without adding any chemical agents (e.g., H2O2 / Fe2+). It can also precipitate different metals through the potential difference between the first anode plate 101 and the second anode plate 201, thereby achieving high-purity recovery of metals from wastewater.

[0044] It should be noted that wastewater COD (Chemical Oxygen Demand) is a key indicator for measuring the degree of organic pollution in water bodies.

[0045] For example, primary treatment unit 1 precipitates silver, and secondary treatment unit 2 precipitates copper, in order to achieve high-purity recovery of metals from wastewater.

[0046] In this embodiment, the primary processing mechanism 1 includes: a first processing chamber 103 and a first cover plate 104. The first processing chamber 103 is connected to the first cover plate 104. The first anode plate 101 and the first cathode plate 102 are both installed in the first processing chamber 103. Multiple first nozzles 105 are provided on the side of the first cover plate 104 closest to the first processing chamber 103, and the first cover plate 104 has a first through hole 106. Multiple first drain pipes 107 are provided on the side of the first processing chamber 103 furthest from the first cover plate 104. A first valve 108 is installed on a sewage pipe 107; multiple first grooves 109 are provided on the side of the first anode plate 101 and the first cathode plate 102 away from the first cover plate 104; multiple first anode plates 101 and multiple first cathode plates 102 are provided, and the number of first anode plates 101 is equal to the number of first cathode plates 102; multiple first anode plates 101 are arranged in sequence at equal intervals, multiple first cathode plates 102 are arranged in sequence at equal intervals, and the first anode plates 101 and the first cathode plates 102 are arranged alternately. Therefore, by opening the first cover plate 104, the metal element deposited and attached to the first cathode plate 102 can be scraped off and recycled; the water sprayed by the first nozzle 105 can act on the first treatment chamber 103 after the wastewater treatment is completed, so as to wash away the impurities in the first treatment chamber 103; the gas can be discharged during the wastewater electrolysis process through the first through hole 106; the first valve 108 can be opened to discharge the impurities in the first treatment chamber 103 through the first drain pipe 107; in addition, during the wastewater treatment process, the wastewater can be sampled and tested through the second drain pipe 207 to change the potential of the second anode plate 201, so as to realize the dynamic adjustment of the wastewater treatment process of the secondary treatment unit 2; through the cooperation of multiple second anode plates 201 and multiple second cathode plates 202, the efficiency and effect of re-depositing metal, the efficiency and effect of re-degrading organic matter, and the efficiency and effect of further reducing the COD of wastewater can be improved; the second groove 209 facilitates the flow of wastewater in the second treatment chamber 203.

[0047] Specifically, the second nozzle 205 is connected to a second water spray pipe (not shown in the figure), and the water in the second water spray pipe is sprayed out through the second nozzle 205 to act on the second anode plate 201 and the second treatment chamber 203.

[0048] In this embodiment, the secondary treatment mechanism 2 includes: a second treatment chamber 203 and a second cover plate 204, the second treatment chamber 203 being connected to the second cover plate 204, and the second anode plate 201 and the second cathode plate 202 being installed inside the second treatment chamber 203; a plurality of second nozzles 205 are provided on the side of the second cover plate 204 near the second treatment chamber 203, and the second cover plate 204 has a second through hole 206; a plurality of second drain pipes 207 are provided on the side of the second treatment chamber 203 away from the second cover plate 204, and the second... A second valve 208 is installed on the second drain pipe 207; multiple second grooves 209 are provided on the side of the second anode plate 201 and the second cathode plate 202 away from the second cover plate 204; multiple second anode plates 201 and multiple second cathode plates 202 are provided, and the number of second anode plates 201 is equal to the number of second cathode plates 202; multiple second anode plates 201 are arranged at equal intervals in sequence, multiple second cathode plates 202 are arranged at equal intervals in sequence, and the second anode plates 201 and the second cathode plates 202 are arranged alternately. Therefore, by opening the second cover plate 204, the precipitated and attached elemental metal on the second cathode plate 202 can be scraped off and recycled; the water sprayed by the second nozzle 205 can act on the second treatment chamber 203 after the wastewater treatment is completed, so as to wash away the impurities in the second treatment chamber 203; the gas can be discharged during the wastewater electrolysis process through the second through hole 206; the second valve 208 can be opened to discharge the impurities in the second treatment chamber 203 through the second drain pipe 207. In addition, during the wastewater treatment process, the wastewater can be sampled and tested through the second drain pipe 207 to change the potential of the second anode plate 201, so as to realize the dynamic adjustment of the wastewater treatment process of the secondary treatment unit 2; through the cooperation of multiple second anode plates 201 and multiple second cathode plates 202, the efficiency and effect of re-precipitating metal, the efficiency and effect of re-degrading organic matter, and the efficiency and effect of further reducing the COD of wastewater can be improved; the second groove 209 facilitates the flow of wastewater in the second treatment chamber 203.

[0049] Specifically, the second nozzle 205 is connected to a second water spray pipe (not shown in the figure), and the water in the second water spray pipe is sprayed out through the second nozzle 205 to act on the second anode plate 201 and the second treatment chamber 203.

[0050] In this embodiment, the system further includes a first bag filter 3 and a second bag filter 4. The outlet end of the first bag filter 3 is connected to the inlet end of the primary treatment unit 1, and the inlet end of the second bag filter 4 is connected to the outlet end of the secondary treatment unit 2. Thus, the first bag filter 3 is used to filter solid impurities that are insoluble in the wastewater before treatment, facilitating subsequent wastewater treatment; the second bag filter 4 is used to filter solid impurities generated during wastewater treatment (electrolysis), facilitating the transport of the treated liquid.

[0051] In this embodiment, the system further includes: a first connecting pipe 5, a second connecting pipe 6, and a third connecting pipe 7. The outlet end of the first bag filter 3 is connected to the inlet end of the primary treatment unit 1 through the first connecting pipe 5. The outlet end of the primary treatment unit 1 is connected to the inlet end of the secondary treatment unit 2 through the second connecting pipe 6. The inlet end of the second bag filter 4 is connected to the outlet end of the secondary treatment unit 2 through the third connecting pipe 7. The first connecting pipe 5 is connected in series with a first pump 501 and a flow meter 502. The first pump 501 is installed on the side wall of the first bag filter 3. The second connecting pipe 6 is connected in series with a second pump 601. The second pump 601 is installed on the side wall of the primary treatment unit 1. The third connecting pipe 7 is connected in series with a third pump 701. The third pump 701 is installed on the side wall of the secondary treatment unit 2. Thus, the first pump 501, the second pump 601, and the third pump 701 serve as power sources, causing the wastewater to flow sequentially through the first bag filter 3, the primary treatment unit 1, the secondary treatment unit 2, and the second bag filter 4. The flow meter 502 can detect the flow rate of the wastewater before treatment and compare it with the flow rate of the liquid after treatment to calculate the content of metals and organic matter in the wastewater.

[0052] Specifically, the outlet end of the first bag filter 3 is connected to the inlet end of the first treatment chamber 103 through a first connecting pipe 5, the outlet end of the first treatment chamber 103 is connected to the inlet end of the second treatment chamber 203 through a second connecting pipe 6, the inlet end of the second bag filter 4 is connected to the outlet end of the second treatment chamber 203 through a third connecting pipe 7, the second pump 601 is installed on the first treatment chamber 103, and the third pump 701 is installed on the second treatment chamber 203.

[0053] In this embodiment, it also includes: an inlet pipe 8 and an outlet pipe 9, wherein the inlet pipe 8 is connected to the inlet end of the first bag filter 3, and the outlet pipe 9 is connected to the outlet end of the second bag filter 4.

[0054] Specifically, the first processing chamber 103, the second processing chamber 203, the first bag filter 3, and the second bag filter 4 are all installed on the base 10.

[0055] The wastewater treatment process of this utility model is as follows: First, the wastewater to be treated is injected into the first bag filter 3 through the inlet pipe 8, and the first bag filter 3 filters out solid impurities that are insoluble in the wastewater before treatment. Then, the first pump 501, the second pump 601, and the third pump 701 are started so that the wastewater passes sequentially through the primary treatment mechanism 1 (at this time, the potential of the first anode plate 101 is A), the secondary treatment mechanism 2 (at this time, the potential of the second anode plate 201 is B, and the potential A is less than the potential B), and the second bag filter 4, passing through the primary treatment mechanism 1. The first treatment unit 1 performs initial metal precipitation, initial degradation of organic matter, and initial reduction of COD in the wastewater. The second treatment unit 2 performs further metal precipitation, further degradation of organic matter, and initial reduction of COD in the wastewater. Solid impurities generated during wastewater treatment (electrolysis) are filtered out by the second bag filter 4. After wastewater treatment is complete, the solid impurities in the first bag filter 3 and the second bag filter 4 are discharged. The first cover plate 104 is opened to scrape off the precipitated elemental metal adhering to the first cathode plate 102 and recover it. Water sprayed from nozzle 105 acts on the first treatment chamber 103 to flush away impurities. The first valve 108 is opened, and the flushed impurities are discharged through the first drain pipe 107. The second cover plate 204 is opened to scrape off and recover the precipitated elemental metal adhering to the second cathode plate 202. Water sprayed from the second nozzle 205 acts on the second treatment chamber 203 to flush away impurities. The second valve 208 is opened, and the flushed impurities are discharged through the second drain pipe 207. Finally, the liquid flowing out of the outlet pipe 9 is tested to determine its COD. If the COD of the liquid meets the requirements, it is discharged directly. If the liquid does not meet the requirements, it is returned to the inlet pipe 8, and the above steps are repeated (in each repetition, the potential of the first anode plate 101 is greater than the potential of the second anode plate 201 in the previous cycle, and in the same wastewater treatment process, the potential of the first anode plate 101 is always less than the potential of the second anode plate 201) until the COD of the liquid meets the requirements.

[0056] In summary, by performing metal precipitation treatment, organic matter degradation, and COD reduction of wastewater twice through primary treatment unit 1 and secondary treatment unit 2, compared with the existing anodic electro-oxidation method, this treatment method has a simpler structure, is easier to operate, and can achieve graded precipitation and recycling of metals, graded degradation of organic matter, and graded reduction of wastewater COD, thereby improving the treatment effect of metals and organic matter in wastewater, thoroughly recovering metal ions and fully degrading organic matter in wastewater. In addition, the entire wastewater treatment process only changes the potential of the first anode plate 101 and the second anode plate 201, without adding any chemical agents. It can also use the potential difference between the first anode plate 101 and the second anode plate 201 to precipitate different metals, thereby achieving high-purity recovery of metals from wastewater.

[0057] The above description is an explanation of the present utility model and not a limitation thereof. The scope of the present utility model is defined by the claims. Within the protection scope of the present utility model, any form of modification may be made.

Claims

1. A wastewater treatment device with metal ions, organic matter, characterized by, include: A primary treatment unit (1) is provided with a first anode plate (101) and a first cathode plate (102) inside the primary treatment unit (1). The potential of the first anode plate (101) is A. The primary treatment unit (1) is used for the initial precipitation of metals, the initial degradation of organic matter, and the initial reduction of COD of wastewater. The secondary treatment unit (2) is connected to the outlet of the primary treatment unit (1) at its inlet end. The secondary treatment unit (2) is equipped with a second anode plate (201) and a second cathode plate (202) inside. The potential of the second anode plate (201) is B. The secondary treatment unit (2) is used to precipitate metals again, degrade organic matter again, and reduce the COD of wastewater again. Where: potential A is less than potential B.

2. The wastewater treatment apparatus with metal ions and organic matter according to claim 1, characterized by: Multiple first anode plates (101) and first cathode plates (102) are provided, and the number of first anode plates (101) is equal to the number of first cathode plates (102); Multiple first anode plates (101) are arranged sequentially at equal intervals, and multiple first cathode plates (102) are arranged sequentially at equal intervals, with the first anode plates (101) and the first cathode plates (102) being arranged alternately.

3. The wastewater treatment apparatus with metal ions and organic matter according to claim 1, wherein: Multiple second anode plates (201) and multiple second cathode plates (202) are provided, and the number of second anode plates (201) is equal to the number of second cathode plates (202); Multiple second anode plates (201) are arranged sequentially at equal intervals, and multiple second cathode plates (202) are arranged sequentially at equal intervals, with the second anode plates (201) and the second cathode plates (202) being arranged alternately.

4. The wastewater treatment apparatus with metal ions and organic matter according to claim 1, wherein: Also includes: A first bag filter (3) and a second bag filter (4), wherein the outlet end of the first bag filter (3) is connected to the inlet end of the primary treatment unit (1), and the inlet end of the second bag filter (4) is connected to the outlet end of the secondary treatment unit (2).

5. The wastewater treatment apparatus with metal ions, organic matter according to claim 4, wherein: Also includes: The first connecting pipe (5), the second connecting pipe (6), and the third connecting pipe (7) are connected. The outlet end of the first bag filter (3) is connected to the inlet end of the primary processing unit (1) through the first connecting pipe (5). The outlet end of the primary processing unit (1) is connected to the inlet end of the secondary processing unit (2) through the second connecting pipe (6). The inlet end of the second bag filter (4) is connected to the outlet end of the secondary processing unit (2) through the third connecting pipe (7). The first connecting pipe (5) is connected in series with a first pump (501) and a flow meter (502), and the first pump (501) is installed on the side wall of the first bag filter (3); The second connecting pipe (6) is connected in series with a second pump (601), which is installed on the side wall of the primary processing unit (1); The third connecting pipe (7) is connected in series with a third pump (701), which is installed on the side wall of the secondary processing unit (2).

6. The wastewater treatment apparatus with metal ions and organic matter according to claim 1, wherein: The primary processing unit (1) includes: The first processing chamber (103) and the first cover plate (104) are connected. The first anode plate (101) and the first cathode plate (102) are both installed in the first processing chamber (103). The first cover plate (104) is provided with a plurality of first nozzles (105) on the side near the first processing chamber (103), and the first cover plate (104) is provided with a first through hole (106); The first processing chamber (103) is provided with a plurality of first drain pipes (107) on the side away from the first cover plate (104), and a first valve (108) is installed on the first drain pipe (107).

7. The wastewater treatment device containing metal ions and organic matter as described in claim 6, characterized in that: The first anode plate (101) and the first cathode plate (102) are provided with a plurality of first grooves (109) on the side away from the first cover plate (104).

8. The wastewater treatment apparatus with metal ions and organic matter according to claim 1, wherein: The secondary processing unit (2) includes: The second processing chamber (203) and the second cover plate (204) are connected together. The second anode plate (201) and the second cathode plate (202) are both installed in the second processing chamber (203). The second cover plate (204) is provided with a plurality of second nozzles (205) on the side near the second processing chamber (203), and the second cover plate (204) is provided with a second through hole (206); The second processing chamber (203) is provided with a plurality of second drain pipes (207) on the side away from the second cover plate (204), and a second valve (208) is installed on the second drain pipe (207).

9. The wastewater treatment device containing metal ions and organic matter as described in claim 8, characterized in that: The second anode plate (201) and the second cathode plate (202) are provided with a plurality of second grooves (209) on the side away from the second cover plate (204).

10. The wastewater treatment apparatus with metal ions and organic matter according to claim 4, wherein: Also includes: The inlet pipe (8) and outlet pipe (9) are connected to the inlet end of the first bag filter (3) and the outlet pipe (9) is connected to the outlet end of the second bag filter (4).

Images