CN113060805A - Carbon fiber solar water purifier and heavy metal sewage treatment method - Google Patents
Carbon fiber solar water purifier and heavy metal sewage treatment method Download PDFInfo
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- CN113060805A CN113060805A CN202110355448.5A CN202110355448A CN113060805A CN 113060805 A CN113060805 A CN 113060805A CN 202110355448 A CN202110355448 A CN 202110355448A CN 113060805 A CN113060805 A CN 113060805A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
- C02F1/46109—Electrodes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
- C02F1/46109—Electrodes
- C02F2001/46133—Electrodes characterised by the material
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/46—Apparatus for electrochemical processes
- C02F2201/461—Electrolysis apparatus
- C02F2201/46105—Details relating to the electrolytic devices
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/46—Apparatus for electrochemical processes
- C02F2201/461—Electrolysis apparatus
- C02F2201/46105—Details relating to the electrolytic devices
- C02F2201/4616—Power supply
- C02F2201/46165—Special power supply, e.g. solar energy or batteries
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Abstract
The invention discloses a carbon fiber solar water purifier and a heavy metal sewage treatment method, which comprises a power supply and a sewage treatment device, wherein the sewage treatment device is of a box-packed structure, a front side plate and a rear side plate of the box-packed structure are respectively provided with a plurality of through holes, the left side wall of the box-packed structure is provided with a cathode, the cathode comprises an oxygen-enriched activated carbon fiber layer, the right side wall of the box-packed structure is provided with an anode, the anode is a graphite plate, the power supply is electrically connected with the cathode and the anode, the power supply is a solar cell panel, and the specific surface area of the oxygen-enriched activated carbon fiber is 500-4000 m2(ii) a surface oxygen content of 3 to 30% by weight. The invention can be used for purifying high-concentration heavy metal sewage, low-concentration electroplating wastewater, heavy metal polluted rivers and lakes and other low-concentration heavy metal sewage, and can be used for purifying the low-concentration heavy metal sewage through electric adsorptionThe one-step method realizes the purification treatment of heavy metal ions, thereby effectively improving the water quality.
Description
Technical Field
The invention relates to a carbon fiber solar water purifier and a heavy metal sewage treatment method.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
At present, heavy metal sewage poses great threat to ecological environment and human health, and becomes a global environmental problem, and how to effectively treat heavy metal sewage is a prominent problem facing current environmental protection work. Copper, chromium, nickel and the like are common harmful heavy metal pollutants, are generally discharged by electroplating, metallurgy, refining, printing, chemical fertilizer and other industries, and can cause liver injury and acute poisoning of human bodies due to excessive intake of heavy metal ions.
The treatment method of heavy metal sewage can be divided into three categories: physical methods including adsorption, membrane separation, solvent extraction, ion exchange, evaporative concentration, and the like; chemical methods, including chemical precipitation methods, electrochemical methods; biological methods, including bioremediation, bioflocculation, and bioadsorption. The heavy metal sewage with higher concentration can be easily treated by methods such as electrochemical operation, reverse osmosis or chemical treatment. However, the inventor researches and discovers that when the heavy metal sewage with lower concentration is treated, such as low-concentration electroplating wastewater and heavy metal polluted rivers and lakes, the existing method has poor treatment effect and higher application cost, and is not suitable for industrial application, so that new generation heavy metal sewage treatment equipment needs to be developed urgently.
Disclosure of Invention
In order to solve the defects of the prior art, the invention aims to provide a carbon fiber solar water purifier and a heavy metal sewage treatment method, which can be used for purifying not only high-concentration heavy metal sewage but also low-concentration heavy metal sewage such as low-concentration electroplating wastewater, heavy metal polluted rivers and lakes and the like, and realize the purification treatment of heavy metal ions through an electro-adsorption one-step method, thereby effectively improving the water quality.
In order to achieve the purpose, the technical scheme of the invention is as follows:
on the one hand, carbon fiber solar energy water purifier, including power and sewage treatment plant, sewage treatment plant is box-packed structure, the preceding curb plate and the posterior lateral plate of box-packed structure all are equipped with a plurality of through-holes, the left side wall of box-packed structure is equipped with the negative pole, and the negative pole includes oxygen boosting activated carbon fiber layer, the right side wall of box-packed structure is equipped with the positive pole, and the positive pole is the graphite plate, and the power is connected with negative pole, positive pole electricity, the power is solar cell panel, and oxygen boosting activated carbon fiber's specific surface area is 500 ~ 4000m2(ii) a surface oxygen content of 3 to 30% by weight.
The through holes arranged on the front side plate and the rear side plate can stabilize the flow velocity of sewage flowing into the sewage treatment device, prevent larger particle impurities from entering and avoid influencing the treatment of heavy metal ions in the sewage. The invention uses the electric field formed by the cathode plate containing the oxygen-enriched activated carbon fiber layer and the anode plate as the graphite plate in the sewage treatment device, and has good treatment effect on heavy metal ions.
On the other hand, the carbon fiber solar water purifier is applied to treatment of heavy metal sewage.
In a third aspect, a method for treating heavy metal sewage is provided, wherein the carbon fiber solar water purifier is provided, a sewage treatment device is placed in heavy metal sewage to be treated, and electric adsorption treatment is performed by adopting solar power supply.
The invention has the beneficial effects that:
firstly, energy conservation and environmental protection are achieved. The oxygen-enriched activated carbon fiber solar water purifier adopts a solar power supply mode, so that the oxygen-enriched activated carbon fiber solar water purifier is green and environment-friendly, and can store electricity by solar energy almost every day; therefore, the storage battery only needs to store the electric quantity needed for 1-2 days, and the all-weather work of the water purifier can be realized, thereby greatly reducing the specification of the storage battery.
Secondly, it is fast and efficient. The oxygen-enriched activated carbon fiber solar water purifier adopts an electro-adsorption one-step method, can treat heavy metal sewage with high copper content to be below drinking standard (1mg/L) within 200min, and finally realizes the purification rate of more than 99% aiming at the heavy metal sewage one-step method.
Thirdly, the operation is flexible and convenient. The oxygen-enriched activated carbon fiber solar water purifier has the characteristics of small volume, flexibility, portability, mobility and the like, is convenient to move from one area to another area, and can be used for purifying heavy metal sewage in each area in a large range in turn.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
Fig. 1 is a schematic structural view of a carbon fiber solar water purifier according to embodiment 1 of the present invention;
FIG. 2 is a view taken along line A-A of FIG. 1;
the solar cell panel comprises a solar cell panel 1, a foam layer 2, a controller 3, a storage battery 4, an anode 5, a cathode 6, a cathode 7 and a box body.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The carbon fiber is a fibrous flexible carbon material, a high-strength and high-modulus carbon fiber can be endowed with a surface-developed microporous structure by utilizing a reactivation technology, the oxygen element content on the surface of the carbon fiber is improved, and the nano or micron microporous structure also endows the carbon fiber with extremely strong adsorption characteristics, namely the carbon fiber is called as an oxygen-enriched activated carbon fiber. The oxygen-rich activated carbon fiber is prepared by activating polyacrylonitrile fiber, viscose fiber and the like.
In view of the problems of poor effect, high cost and the like of the existing method for treating the heavy metal sewage with lower concentration (the concentration is lower than 100mg/L), the invention provides a carbon fiber solar water purifier and a method for treating the heavy metal sewage.
The invention provides a typical embodiment mode, and provides a carbon fiber solar water purifier, which comprises a power supply and a sewage treatment device, wherein the sewage treatment device is of a box-packed structure, a front side plate and a rear side plate of the box-packed structure are respectively provided with a plurality of through holes, the left side wall of the box-packed structure is provided with a cathode, the cathode comprises an oxygen-enriched activated carbon fiber layer, the right side wall of the box-packed structure is provided with an anode, the anode is a graphite plate, the power supply is electrically connected with the cathode and the anode, the power supply is a solar cell panel, and the specific surface area of the oxygen-enriched activated carbon fiber is 500-4000 m2(ii) a surface oxygen content of 3 to 30% by weight.
The through holes arranged on the front side plate and the rear side plate can stabilize the flow velocity of sewage flowing into the sewage treatment device, prevent larger particle impurities from entering and avoid influencing the treatment of heavy metal ions in the sewage. The invention uses the electric field formed by the cathode plate containing the oxygen-enriched activated carbon fiber layer and the anode plate as the graphite plate in the sewage treatment device, and has good treatment effect on heavy metal ions.
The specific surface area is 500-4000 m2The preparation of oxygen-enriched activated carbon fibers with a surface oxygen content of 3-30% can be seen in Yu L, Yu J, Zhu B, et al]Materials Research Express, 2020. When the specific surface area of the oxygen-enriched activated carbon fiber is 1000-2600 m2And when the oxygen content of the surface is 10-30%, the sewage treatment effect is better.
Some examples of this embodiment include a control converter and a battery, the solar panel electrically connected to the control converter, the controller electrically connected to the battery, and the battery electrically connected to the cathode plate and the anode plate. The current of the water purifier is 0.05-0.2A, the voltage is 0-24V, and according to the required constant current output function, the converter is controlled to select a JRF-P20A type controller, and finally the controller is connected with a storage battery and a sewage purification device, so that the water purifier is controlled.
The storage battery can be reasonably matched according to the specification of the solar panel so that the storage battery is matched with the performance of the solar panel, and in one or more embodiments, the specification of the storage battery is 12V10Ah, 12V14Ah or 12V20 Ah.
The solar cell panel provided by the invention adopts a common solar panel of 20W, 30W or 40W, tests are carried out according to the actual purified sewage, and the specification of the solar panel is reasonably selected. For avoiding water purifier motion and leading to cloudy face, sunny face problem, simultaneously for guaranteeing water purifier overall stability, some embodiments of this embodiment, solar cell panel level is laid on box-packed structure to seal with sealed glue.
In one or more embodiments, a foam strip is installed between the solar panel and the box structure. The floating of the carbon fiber solar water purifier on the water surface can be ensured.
In one or more embodiments, a cavity is arranged between the solar cell panel and the box-packed structure, the control converter and the storage battery are arranged in the cavity, and the foam strips are arranged on the outer wall of the cavity.
In some examples of this embodiment, the oxygen-rich activated carbon fiber layer is formed by weaving or laminating the oxygen-rich activated carbon fibers in any one of a non-woven fabric, an eyelet fabric, a plain weave, a twill, a satin weave, and the like.
The distance between the cathode plate and the anode plate influences the sewage treatment effect, and in some embodiments of the embodiment, the clamping grooves matched with the plurality of anodes are arranged on the inner wall of the box-packed structure in parallel. The anode plate is adjusted at different positions through the matching of the clamping groove and the anode plate, so that the control of the distance between the two electrode plates is realized, and the distance between the two electrode plates is adjustable within 5-30 cm. According to the actual condition of sewage, the distance between the two electrode materials is reasonably adjusted, so that the water purifier keeps the best performance.
In some examples of this embodiment, the diameter of the through-hole is 1 to 10 mm.
In some embodiments of this embodiment, a filter screen is disposed within the through-hole.
In another embodiment of the invention, the application of the carbon fiber solar water purifier in treating heavy metal sewage is provided.
According to the third embodiment of the invention, the carbon fiber solar water purifier is provided, the sewage treatment device is placed in the heavy metal sewage to be treated, and the electric adsorption treatment is carried out by adopting solar power supply.
In some examples of this embodiment, the wastewater treatment plant is powered in a constant current mode.
In one or more embodiments, the current supplied to the sewage treatment device is 0.01-0.2A.
In order to make the technical solutions of the present invention more clearly understood by those skilled in the art, the technical solutions of the present invention will be described in detail below with reference to specific embodiments.
Example 1
A carbon fiber solar water purifier is shown in figures 1-2 and comprises a solar power supply device, a control conversion device and a sewage treatment device. The solar power supply device comprises a solar panel 1 and a storage battery 4. The sewage treatment device comprises a box body 7, a plurality of through holes are formed in the front side plate and the rear side plate of the box body 7, and a cathode 6 and an anode 5 are respectively arranged on the inner walls of the left side plate and the right side plate of the box body 7. The solar cell panel 1 is arranged on the box body 7, and the conversion device and the storage battery 4 are packaged between the solar cell panel 1 and the box body 7 through the foam 2. The three parts of devices are connected into a whole through a control circuit, heavy metal sewage enters the sewage treatment device through the small holes on the two sides, and the rapid purification treatment of the heavy metal sewage is completed under the combined action of the oxygen-enriched active carbon fibers and the electric field.
Designing and preparing the solar power supply device. A solar panel 1 with the size 410 x 350 x 25mm and 20W is adopted, and the peak voltage is 17.5V; the storage battery 4 with the 12V10Ah model is used for storing the electric energy generated by the solar panel and supplying power to the water purifier. The solar cell panel 1 and the storage battery 4 are connected together through a control circuit, and finally a solar power supply device of the water purifier is formed.
Controlling the selected design of the conversion means. The device selects a JRF-P20A model controller to achieve the purpose of constant current output. The control converter is arranged among the solar panel, the storage battery and the sewage treatment device, electric energy generated by the solar panel is stored in the storage battery through the controller, the electric energy in the storage battery supplies power to the sewage treatment device in a constant current mode through the controller 3, and the current is set to be 0.1A.
Designing and preparing a sewage treatment device. The device comprises a cathode 6 and an anode 5. (1) The specific surface area is selected to be 2500m2The viscose-based oxygen-enriched activated carbon fiber felt with the surface oxygen content of 30 percent adopts a sandwich structure of non-woven fabric-activated carbon fiber felt-non-woven fabric as a cathode. (2) The graphite electrode plate is used as an anode, and a common graphite plate is selected, wherein the size is 200 × 100 mm. (3) The setting of oxygen enrichment activated carbon fiber and graphite electrode plate interval sets up the draw-in groove in the different positions of water purifier box inner wall, through adjusting graphite electrode plate in suitable position to realize the control of two electrode material intervals, make two electrode intervals be 5 cm. (4) The design of the sewage treatment device box body, the cathode and the anode are positioned at the left side and the right side of the box body, the front end and the rear end of the box body are respectively provided with 30 multiplied by 20 evenly distributed 2mm small holes so as to stabilize the flow velocity of sewage flowing into a purification space, and meanwhile, a filter screen is arranged in the small holes to prevent larger impurities in water from entering the box body and accumulating. Finally, the heavy metal sewage containing 20mg/L of copper can be treated to 0.01mg/L which is far lower than the drinking standard (1mg/L) within 200min by the treatment of the water body purifier, and the purification rate of more than 99 percent of the heavy metal sewage by a one-step method is finally realized.
Example 2
The structure of the carbon fiber solar water purifier is the same as that of the embodiment 1.
Designing and preparing the solar power supply device. A 30W solar panel with the size of 600 x 450 x 40mm is adopted, and the peak voltage is 17.5V; a storage battery with the 12V14Ah model is used for storing the electric energy generated by the solar panel and supplying power to the water body purifier. The solar cell panel and the storage battery are connected together through the control circuit, and finally the solar power supply device of the water purifier is formed.
Controlling the selected design of the conversion means. The device selects a JRF-P20A model controller to achieve the purpose of constant current output. The control converter is arranged among the solar panel, the storage battery and the sewage treatment device, electric energy generated by the solar panel is stored in the storage battery through the controller, the electric energy in the storage battery is used for supplying electricity to the sewage treatment device in a constant current mode through the controller, and the current is set to be 0.15A.
Designing and preparing a sewage treatment device. The device comprises oxygen-enriched active carbon fibers (cathode), a graphite electrode plate (anode) and a distance between the two electrodes. (1) Choose 2000m2And the adhesive-based oxygen-enriched activated carbon fiber felt with the surface oxygen content of 20% adopts a sandwich structure of non-woven fabric-activated carbon fiber felt-non-woven fabric as a cathode. (2) The graphite electrode plate is made of common graphite plates, and the size is 250 x 80 mm. (3) The setting of rich oxygen active carbon fiber and graphite electrode plate interval sets up the draw-in groove in the different positions of water purifier box inner wall, through adjusting graphite electrode plate in suitable draw-in groove to realize the control of two electrode material intervals, make two electrode intervals be 10 cm. (4) The design of the sewage treatment device box body is that the front end and the rear end of the box body are respectively provided with 10 multiplied by 8 evenly distributed phi 8mm small holes so as to stabilize the flow rate of sewage flowing into the purification space, and meanwhile, a filter screen is arranged in the small holes to prevent larger impurities in water from entering the box body and accumulating. Finally, the heavy metal sewage containing 50mg/L of copper can be treated to 0.03mg/L which is far lower than the drinking standard (1mg/L) within 240min by the treatment of the water body purifier, and the purification rate of more than 99 percent of the heavy metal sewage by a one-step method is finally realized.
Example 3
Designing and preparing the solar power supply device. A 40W solar panel with size 540 x 25mm, peak voltage 17.5V was used; a storage battery with the 12V20Ah model is used for storing the electric energy generated by the solar panel and supplying power to the water body purifier. The solar cell panel and the storage battery are connected together through the control circuit, and finally the solar power supply device of the water purifier is formed.
Controlling the selected design of the conversion means. The device selects a JRF-P20A model controller to achieve the purpose of constant current output. The control converter is arranged among the solar panel, the storage battery and the sewage treatment device, electric energy generated by the solar panel is stored in the storage battery through the controller, the electric energy in the storage battery supplies power to the sewage treatment device in a constant-current mode through the controller, and the current is set to be 0.2A.
Designing and preparing a sewage treatment device. The device comprises oxygen-enriched active carbon fibers (cathode), a graphite electrode plate (anode) and a distance between the two electrodes. (1) The specific surface area is selected to be 1500m2The carbon fiber fabric woven by the pitch-based oxygen-enriched activated carbon fiber is used as a cathode material. (2) The graphite electrode plate is a common graphite plate, and the size is 200 × 100 mm. (3) The setting of oxygen enrichment activated carbon fiber and graphite electrode plate interval sets up the draw-in groove in the different positions of water purifier box inner wall, through adjusting graphite electrode plate in suitable draw-in groove to realize the control of two electrode material intervals, make two electrode intervals be 30 cm. (4) The design of the sewage treatment device box body is that the front end and the rear end of the box body are respectively provided with 20 multiplied by 10 evenly distributed phi 4mm small holes so as to stabilize the flow rate of sewage flowing into the purification space, and meanwhile, a filter screen is arranged in the small holes to prevent larger impurities in water from entering the box body and accumulating. Finally, the heavy metal sewage containing 70mg/L of copper can be treated to 0.1mg/L which is far lower than the drinking standard (1mg/L) within 240min by the treatment of the water body purifier, and the purification rate of more than 99 percent of the heavy metal sewage by a one-step method is finally realized.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a carbon fiber solar energy water purifier, characterized by, includes power and sewage treatment plant, sewage treatment plant is box-packed structure, the preceding curb plate and the posterior lateral plate of box-packed structure all are equipped with a plurality of through-holes, the left side wall of box-packed structure is equipped with the negative pole, and the negative pole includes oxygen boosting activated carbon fiber layer, the right side wall of box-packed structure is equipped with the positive pole, and the positive pole is the graphite cake, and the power is connected with negative pole, positive pole electricity, the power is solar cell panel, and the specific surface area of oxygen boosting activated carbon fiber is 500 ~ 4000m2(ii) a surface oxygen content of 3 to 30% by weight.
2. The carbon fiber solar water purifier of claim 1, comprising a control converter and a storage battery, wherein the solar panel is electrically connected to the control converter, the controller is electrically connected to the storage battery, and the storage battery is electrically connected to the cathode plate and the anode plate.
3. The carbon fiber solar water purifier of claim 1, wherein the solar panel is horizontally laid on top of the box structure and sealed with a sealant.
4. The carbon fiber solar water purifier of claim 1, wherein a foam strip is installed between the solar panel and the box structure;
or a cavity is arranged between the solar cell panel and the box-packed structure, and the foam strips are arranged on the outer wall of the cavity in the control converter and the storage battery installation cavity.
5. The carbon fiber solar water purifier as claimed in claim 1, wherein the oxygen-rich activated carbon fiber layer is formed by weaving the oxygen-rich activated carbon fibers in a form of any one of non-woven fabric, mesh fabric, plain weave, twill weave and satin weave or by laminating a plurality of weaving forms.
6. The carbon fiber solar water purifier of claim 1, wherein the inner wall of the box structure is provided with a plurality of slots in parallel to match with the anodes.
7. The carbon fiber solar water purifier of claim 1, wherein the diameter of the through hole is 1-10 mm;
or a filter screen is arranged in the through hole.
8. Use of the carbon fiber solar water purifier according to any one of claims 1-7 in treatment of heavy metal wastewater.
9. A treatment method of heavy metal sewage is characterized in that the carbon fiber solar water purifier as claimed in any one of claims 1 to 7 is provided, a sewage treatment device is placed in the heavy metal sewage to be treated, and electric adsorption treatment is carried out by adopting solar power supply.
10. The method according to claim 9, wherein the power is supplied to the sewage treatment apparatus in a constant current mode;
preferably, the current for supplying power to the sewage treatment device is 0.01-0.2A.
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