CN113321379A - Electrochemical-assisted efficient composite desalting method - Google Patents
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Abstract
The invention relates to an electrochemical-assisted efficient composite desalting method, which is characterized in that waste water is subjected to anaerobic and aerobic biochemical treatment and then subjected to electrochemical desalting, most of salt in the waste water can be separated out through anaerobic and aerobic treatment, the salt content of recycled water can be stably or further reduced through the electrochemical desalting, the total salt content in the recycled water is greatly reduced, the fluctuation of the salt content of the outlet water of a system caused by unstable concentration and activity of microorganisms in the system is avoided, the recycled water content of the treated water is improved, and a large amount of water is saved. The desalting cost can be effectively controlled, the requirement of production on recycled water is met, and the production stability of enterprises is ensured.
Description
Technical Field
The invention relates to an electrochemical-assisted efficient composite desalting method, and belongs to the technical field of environment-friendly water treatment and purification.
Background
With the increase of the use cost of industrial water, most production enterprises at present adopt the measures that wastewater is treated and then reused for production in order to control the cost so as to reduce the use amount of clear water in production, increase the cycle times of the wastewater in the production process, further reduce the amount of water discharged by the enterprises and save the cost. It is well known that as the number of times the wastewater is circulated within the system increases, the salt content of the wastewater also accumulates. If the salt content of the reuse water is more accumulated along with the increase of the cycle times if the waste water treatment system can not effectively remove the salt content, the normal production activities can be influenced by the waste water with high salt content, if the pipelines and the equipment are seriously scaled and blocked, the product quality is deteriorated, and the quality requirement of normal production on the reuse water can not be met.
The high-salinity wastewater refers to wastewater containing at least 1% of salt by mass. The traditional high-salinity wastewater treatment method comprises a membrane treatment method and an evaporation concentration method. The traditional evaporation concentration treatment method has high operation cost, high salinity concentration of the generated concentrated solution and higher treatment difficulty, the membrane treatment is the most common treatment method, the salinity in the wastewater can be reduced, but the method has the defects of high investment, complex system, easy pollution, short membrane service life, frequent back flushing, high operation cost and the like, and is not suitable for being popularized and used in large-scale sewage treatment plants. In view of the above problems, a new technology for desalting recycled water, which is suitable for large water volume, simple and convenient operation and low cost, needs to be developed.
Chinese patent CN110642382A discloses an anaerobic and aerobic composite biological treatment desalting method, which comprises the following steps: and sequentially carrying out anaerobic reaction treatment and aerobic reaction treatment on the sewage to be treated under the action of anaerobic sludge and aerobic biochemical sludge, mixing salts in the sewage in the form of inorganic salt sludge in the anaerobic sludge and the aerobic biochemical sludge, and discharging the mixture to obtain desalted sewage after the anaerobic reaction treatment and the aerobic reaction treatment. However, the method is easily affected by unstable concentration and activity of microorganisms in the system, so that salt content of effluent water of the system fluctuates, and the salt content fluctuation sometimes causes pipeline scaling phenomenon to affect water recycling.
Therefore, it is necessary to develop an efficient desalination method to further control and reduce the total salt content of the treated reuse water, improve the quality of the reuse water, and avoid the fluctuation of the salt content of the system effluent due to the unstable concentration and activity of microorganisms in the system.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an electrochemical-assisted efficient composite desalination method, which greatly reduces the total salt content in the recycled water, avoids the salt content fluctuation of the system effluent caused by unstable concentration and activity of microorganisms in the system, improves the reuse water amount of the treated water, and realizes large water conservation.
The invention is realized by the following technical scheme:
an electrochemical-assisted efficient composite desalination method comprises the following steps:
1) adding anaerobic sludge into the wastewater to be treated for anaerobic reaction treatment, wherein the concentration of the anaerobic sludge is controlled to be 1-80g/L, and obtaining the wastewater after anaerobic treatment;
2) adding aerobic biochemical sludge into the wastewater after anaerobic treatment to carry out aerobic biochemical reaction treatment on the wastewater, and obtaining wastewater after aerobic biochemical treatment;
3) and (3) carrying out electrochemical reaction on the wastewater after the aerobic biochemical treatment, and separating out and adsorbing salt in the water on the surface of the electrode group, so that the salt in the wastewater is further removed, and efficient composite desalination is achieved.
Preferably, according to the present invention, the temperature at which the anaerobic reaction is carried out in step 1) is controlled to be 25 to 39 ℃.
Preferably, according to the present invention, in step 1), the pH at which the anaerobic reaction is carried out is controlled to 6 to 10.
According to the invention, in the step 1), the concentration of the anaerobic sludge is controlled to be 20-60 g/L.
Preferably, according to the invention, the anaerobic residence time in step 1) is controlled to be between 6 and 96 hours.
Preferably, in step 1), a part of the salt in the sewage after the anaerobic reaction treatment is separated out in the form of inorganic salt sludge and mixed in the anaerobic sludge; one part of the anaerobic sludge containing the inorganic salt sludge is returned to the anaerobic reaction process for recycling, and the other part is directly discharged or discharged after precipitation.
Preferably, in step 1), the anaerobic sludge is a mixed sludge of granules and flocculent sludge or flocculent sludge.
According to the invention, in the step 2), the concentration of the aerobic biochemical sludge is controlled to be 0.2-20 g/L.
According to the invention, in the step 2), the concentration of the aerobic biochemical sludge is controlled to be 2-10 g/L.
Preferably, in step 2), the dissolved oxygen is controlled to be 0.5-8 mg/L.
Preferably, in step 2), the dissolved oxygen is controlled to be 2-6 mg/L.
Preferably, in step 2) according to the invention, the aerobic retention time is controlled to be between 6 and 120 hours.
Preferably, in the step 2), during the aerobic reaction treatment, a part of salts (such as calcium salt and the like) in the sewage is combined and reacted with carbon dioxide, oxygen and the like in the air in water under the action of microorganisms, separated or absorbed in the aerobic biochemical sludge, and then discharged along with the aerobic biochemical sludge; one part returns to the aerobic reaction treatment process for recycling, so that the concentration of the aerobic biochemical sludge is ensured, and the other part is directly discharged or discharged after precipitation. For sodium ions, potassium ions and the like in the sewage, on one hand, the sodium ions, the potassium ions and the like are mixed in the aerobic biochemical sludge to serve as the aerobic biochemical substances of the aerobic biochemical sludge, and on the other hand, the sodium ions, the potassium ions and the like can be fixed in the aerobic biochemical sludge to be removed in a sludge discharge mode.
Preferably, in step 2), the aerobic biochemical sludge is sludge generated by an aerobic biochemical system. The aerobic biochemical sludge can adopt conventional commercial products or self-culture.
Preferably, according to the invention, in step 3), the voltage of the electrochemical reaction is between 12 and 60 volts.
The electrochemical auxiliary efficient composite desalting method is carried out by adopting the following processing devices:
the device includes:
the anaerobic reactor is used for carrying out anaerobic treatment on the wastewater, and partial salt substances in the wastewater are mixed into anaerobic sludge in the form of inorganic salt mud;
an aerobic water inlet of the aerobic biochemical reactor is communicated with an anaerobic water outlet of the anaerobic reactor through a pipeline so as to carry out aerobic treatment on the treated water, and an aerobic water outlet of the aerobic biochemical reactor outputs primary desalted water;
a sedimentation tank, a sedimentation water inlet of which is connected with an aerobic water outlet of the aerobic biochemical reactor through a pipeline and is used for carrying out sedimentation on the preliminary desalted water, and a water outlet of the sedimentation tank is output to enter the electrochemical reaction tank;
and an electrochemical water inlet of the electrochemical reaction tank is connected with a water outlet of the sedimentation tank through a pipeline, salt in the water is separated out and adsorbed on the surface of the outer electrode, so that the salt in the wastewater is removed, an electrochemical water outlet of the electrochemical reaction tank is connected with a recycling water inlet of the recycling tank through a pipeline, and the treated fresh water enters the recycling tank for recycling.
According to the invention, preferably, one side of the bottom of the anaerobic reactor is provided with an anaerobic water inlet and an anaerobic sludge inlet, the opposite side is provided with an anaerobic sludge outlet, and anaerobic sludge is refluxed (or added) through the anaerobic sludge inlet.
According to the invention, the bottom of the aerobic biochemical reactor is preferably provided with an aerobic sludge inlet for adding or refluxing aerobic biochemical sludge.
According to the invention, the aerobic biochemical reactor is also provided with an air inlet pipe.
According to the invention, the sedimentation tank is preferably a gravity sedimentation tank, the bottom of the sedimentation tank is flat or conical, when the bottom of the sedimentation tank is flat, a sludge discharge port is arranged at the bottom of the sedimentation tank, and the bottom of the sludge discharge port is connected with a siphon sludge discharge pipe; when the bottom of the sedimentation tank is conical, a sludge discharge port is arranged at the conical bottom.
According to the invention, preferably, the anaerobic sludge outlet of the anaerobic reactor is connected with a tee joint through a pipeline, one outlet of the tee joint is connected with the anaerobic sludge inlet through a pipeline, an anaerobic sludge reflux pump is arranged on the pipeline between the tee joint and the anaerobic sludge inlet, and the other outlet of the tee joint is connected with a sludge treatment system through a pipeline. The anaerobic sludge reflux pump refluxes anaerobic sludge to ensure the sludge concentration in the tank, and the sludge concentration in the anaerobic reactor is preferably controlled to be 1-60 g/L;
according to the invention, the sludge discharge port of the sedimentation tank is preferably connected with the aerobic biochemical sludge inlet through a pipeline, and the pipeline is provided with an aerobic biochemical sludge return pump. The aerobic biochemical sludge reflux pump refluxes the aerobic sludge in the sedimentation tank.
According to the invention, the electrochemical reaction tank comprises a reaction tank body and a high-frequency electrochemical descaling device, the high-frequency electrochemical descaling device is positioned in the reaction tank body, the high-frequency electrochemical descaling device comprises a plurality of groups of electrode groups and a power supply, and the plurality of groups of electrode groups are electrically connected with the power supply.
The invention has not been described in detail, but is in accordance with the state of the art.
The beneficial effects created by the invention are as follows:
1. the desalting method of the invention has the advantages of low investment and low operating cost. The defect that a membrane treatment process is adopted for wastewater desalination is avoided, and the equipment investment cost and the operation cost of water treatment are reduced; the anaerobic sludge adopts granular and flocculent mixed sludge or flocculent sludge, reduces the sludge adding cost, does not adopt granular sludge completely, prevents sludge calcification and avoids generating sludge replacing cost.
2. The desalting method comprehensively utilizes the principles of anaerobic and aerobic biological desalting and electrochemical desalting, and the salt in the wastewater forms settleable substances which are mixed and adsorbed in the sludge and discharged; then salt is separated out from the water and adsorbed on the electrode through electrochemical action, thereby reducing the salt content in the wastewater. The technology has the advantages of simple and convenient operation, stable operation, higher removal efficiency and no problem of difficult treatment of strong brine wastewater.
3. The desalting method of the invention carries out electrochemical desalting after the wastewater is subjected to anaerobic and aerobic biochemical treatment, wherein most of salt in the wastewater can be separated by anaerobic and aerobic treatment, the electrochemical desalting can stabilize or further reduce the salt content of the reuse water, the total salt content in the reuse water is greatly reduced, the fluctuation of the salt content of the system effluent caused by unstable concentration and activity of microorganisms in the system is avoided, the reuse water content of the treated water is improved, and a large amount of water is saved. The desalting cost can be effectively controlled, the requirement of production on recycled water is met, and the production stability of enterprises is ensured.
Drawings
FIG. 1 is a schematic view of the structure of a complex desalting apparatus of the present invention.
Wherein: 1: an anaerobic reactor; 1-1: an anaerobic water inlet; 1-2: an anaerobic water outlet; 1-3 anaerobic sludge inlet; 1-4: an anaerobic sludge outlet; 1-5: an anaerobic sludge reflux pump; 2: an aerobic biochemical reactor; 2-1: an aerobic water inlet; 2-2: an aerobic water outlet; 2-3: an aerobic sludge inlet; 2-4: an air inlet pipe; 2-5: an aerobic biochemical sludge reflux pump; 3: a sedimentation tank; 3-1: a water inlet of the sedimentation tank; 3-2: a water outlet of the sedimentation tank; 3-3: a sludge discharge port; 4: an electrochemical reaction cell; 4-1: an electrochemical water inlet; 4-2: an electrochemical water outlet; 4-3: an electrochemical descaling device; 5: a recycling pool; 5-1: a reuse water inlet; 5-2: and (4) a water outlet is recycled.
Detailed Description
The present invention will be further described by way of examples, but not limited thereto, with reference to the accompanying drawings.
Example 1:
an electrochemical-assisted efficient composite desalination method comprises the following steps:
1) adding anaerobic sludge into the wastewater to be treated to perform anaerobic reaction treatment, and obtaining the wastewater after anaerobic treatment; anaerobic sludge is mixed sludge of particles and flocculent sludge, the concentration of the sludge is controlled to be 1-20g/L, the temperature of inlet water is controlled to be 32-39 ℃, and the pH value of the inlet water is controlled to be 6-9;
2) adding aerobic biochemical sludge into the wastewater after anaerobic treatment for aerobic biochemical reaction treatment, controlling the dissolved oxygen to be 0.5-3mg/L and the sludge concentration to be 0.5-3g/L, and obtaining the wastewater after aerobic biochemical treatment after treatment;
3) after aerobic biochemical treatment, the wastewater is subjected to electrochemical reaction, and salt in the water is separated out and adsorbed on the surface of the external electrode, so that the salt in the wastewater is removed, and efficient composite desalination is achieved.
The electrochemical auxiliary high-efficiency composite desalting method is carried out by adopting a treatment device, wherein the treatment device comprises an anaerobic reactor 1, an aerobic biochemical reactor 2, a sedimentation tank 3, an electrochemical reaction tank 4 and a reuse water tank 5;
an anaerobic reactor 1, wherein one side of the bottom of the anaerobic reactor is provided with an anaerobic water inlet 1-1 and an anaerobic sludge inlet 1-3, the bottom of the opposite side is provided with an anaerobic sludge outlet 1-4, anaerobic sludge is added through the anaerobic sludge inlet, the upper part is provided with an anaerobic water outlet 1-2,
one side of the aerobic biochemical reactor 2 is provided with an aerobic biochemical water inlet 2-1 and an aerobic biochemical sludge inlet 2-3, the other side is provided with an aerobic biochemical water outlet 2-2, the aerobic water inlet 2-1 of the aerobic biochemical reactor is communicated with the anaerobic water outlet 1-2 of the anaerobic reactor through a pipeline so as to carry out aerobic treatment on the treated water, and the aerobic water outlet of the aerobic biochemical reactor outputs preliminary desalted water.
One side of the sedimentation tank 3 is provided with a sedimentation water inlet 3-1, the other side is provided with a sedimentation water outlet 3-2, the sedimentation water inlet 3-1 is connected with an aerobic biochemical water outlet 2-2 of the aerobic biochemical reactor through a pipeline for sedimentation of the preliminary desalted water, and the sedimentation water outlet 3-2 outputs the effluent after sedimentation;
one side of the electrochemical reaction tank is provided with an electrochemical water inlet 4-1, the other side of the electrochemical reaction tank is provided with an electrochemical water outlet 4-2, the electrochemical water inlet 4-1 is connected with the water outlet 3-2 of the sedimentation tank through a pipeline, salt in water is separated out and adsorbed on the surface of the outer electrode, so that the salt in the wastewater is removed, the electrochemical water outlet 4-2 is connected with a recycling water inlet 5-1 of a recycling 5 tank through a pipeline, and the treated fresh water enters the recycling tank for recycling.
An anaerobic sludge outlet 1-4 of the anaerobic reactor 1 is connected with a tee joint through a pipeline, one outlet of the tee joint is connected with an anaerobic sludge inlet 1-3 through a pipeline, an anaerobic sludge reflux pump 1-5 is arranged on the pipeline between the tee joint and the anaerobic sludge inlet, and the other outlet of the tee joint is connected with a sludge treatment system through a pipeline. The anaerobic sludge reflux pump refluxes anaerobic sludge to ensure the sludge concentration in the tank, and the sludge concentration in the anaerobic reactor is preferably controlled to be 1-60 g/L;
a sludge discharge port 3-3 of the sedimentation tank 3 is connected with an aerobic biochemical sludge inlet 2-1 through a pipeline, and an aerobic biochemical sludge return pump 2-5 is arranged on the pipeline. The aerobic biochemical sludge reflux pump refluxes the aerobic sludge in the sedimentation tank.
The electrochemical reaction tank comprises a reaction tank body and a high-frequency electrochemical descaling device, the high-frequency electrochemical descaling device is positioned in the reaction tank body, the high-frequency electrochemical descaling device comprises a group of electrode groups 4-3 and a power supply, and the electrode groups 4-3 are electrically connected with the power supply.
Anaerobic sludge is arranged in the reactor, granular and flocculent mixed sludge is adopted, the concentration of the sludge is controlled to be 1-20g/L, the water inlet temperature of the anaerobic reactor 1 is controlled to be 32-39 ℃, and the pH value of the inlet water is controlled to be 6-9; the dissolved oxygen in the aerobic biochemical reactor 2 is controlled to be 0.5-2mg/L, the aerobic biochemical sludge adopts conventional commercial products, and the sludge concentration is controlled to be 0.5-3 g/L.
The bottom of the sedimentation tank 3 is flat, a sludge discharge port is arranged at the bottom of the sedimentation tank, and a siphon sludge discharge pipe is connected to the bottom of the sedimentation tank.
Example 2:
the electrochemical assisted high efficiency complex desalination method of example 1, except that:
controlling the concentration of anaerobic sludge at 20-40 g/L; the aerobic biochemical dissolved oxygen is controlled to be 2-4mg/L, and the concentration of the aerobic biochemical sludge is controlled to be 3-6 g/L.
Example 3:
the electrochemical assisted high efficiency complex desalination method of example 1, except that:
controlling the concentration of the anaerobic sludge to be 40-60 g/L; the aerobic biochemical dissolved oxygen is controlled to be 4-6mg/L, and the concentration of the aerobic biochemical sludge is controlled to be 6-10 g/L.
Comparative example 1:
the electrochemical assisted high efficiency complex desalination method as in example 2, except that:
the method only carries out anaerobic treatment, the sludge concentration is controlled to be 1-20g/L, the water inlet temperature is controlled to be 32-39 ℃, and the water inlet pH is controlled to be 6-9.
Comparative example 2:
the electrochemical assisted high efficiency complex desalination method as in example 2, except that:
the method only carries out aerobic biochemical treatment, the dissolved oxygen is controlled to be 0.5-2mg/L, and the sludge concentration is controlled to be 0.5-3 g/L.
Comparative example 3:
the electrochemical assisted high efficiency complex desalination method as in example 2, except that:
the method only carries out electrochemical treatment.
Experimental example:
the desalting effect test was performed in the manner of example 2 and comparative examples 1, 2 and 3, respectively, and the wastewater to be treated was pulp and paper-making wastewater of paper industry Co., Ltd, Shandong province. The desalting effect is shown in Table 1 below.
TABLE 1
| Item | Example 2 | Comparative example 1 | Comparative example 2 | Comparative example 3 |
| Calcium salt concentration mg/L before treatment | 3123 | 3123 | 3123 | 3123 |
| Total salt concentration mg/L before treatment | 4677 | 4677 | 4677 | 4677 |
| Concentration of calcium salt after treatment mg/L | 742 | 1752 | 2322 | 1384 |
| The total salt concentration after treatment is mg/L | 2152 | 3086 | 4068 | 2890 |
| Calcium salt removal Rate% | 76.24 | 43.90 | 25.65 | 55.68 |
| Total salt removal rate% | 53.99 | 34.02 | 13.02 | 38.21 |
Note: calcium salt removal rate (calcium salt concentration before treatment-calcium salt concentration after treatment) ÷ calcium salt concentration before treatment × 100%
Total salt removal rate (total salt concentration before treatment-total salt concentration after treatment) ÷ total salt concentration before treatment × 100%
As can be seen from Table 1, the calcium salt removal rate and the total salt removal rate in example 2 were high, while the calcium salt removal rate and the total salt removal rate in comparative examples 1 to 3 were both lower than those in example 2. Therefore, the composite desalting device has better desalting effect and high removing efficiency than a single system.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. An electrochemical-assisted efficient composite desalination method comprises the following steps:
1) adding anaerobic sludge into the wastewater to be treated to perform anaerobic reaction treatment, wherein the concentration of the anaerobic sludge is controlled to be 1-80g/L, and obtaining the wastewater after anaerobic treatment;
2) adding aerobic biochemical sludge into the wastewater after anaerobic treatment for aerobic biochemical reaction treatment to obtain wastewater after aerobic biochemical treatment;
3) and (3) carrying out electrochemical reaction on the wastewater after the aerobic biochemical treatment, and separating out and adsorbing salt in the water on the surface of the electrode group, so that the salt in the wastewater is further removed, and efficient composite desalination is achieved.
2. The electrochemical-assisted efficient composite desalination method of claim 1, wherein the temperature for anaerobic reaction is controlled to be 25-39 ℃.
3. The electrochemical-assisted efficient composite desalination method of claim 1, wherein the pH of the wastewater to be treated is controlled to 6-10 before the anaerobic reaction.
4. The electrochemical-assisted efficient composite desalination method of claim 1, wherein in the step 1), the anaerobic sludge concentration is controlled to be 20-60 g/L.
5. The electrochemical-assisted efficient composite desalination method of claim 1, wherein in the step 1), the anaerobic retention time is controlled to be 6-96 hours; after the anaerobic reaction treatment, part of salt in the sewage is separated out in the form of inorganic salt sludge and mixed in anaerobic sludge, and part of salt is utilized by the sludge and then the anaerobic sludge is discharged; returning one part of anaerobic sludge containing inorganic salt mud to the anaerobic reaction process for recycling, and directly discharging the other part of anaerobic sludge or discharging the other part of anaerobic sludge after precipitation; in the step 1), the anaerobic sludge is mixed sludge of particles and flocculent sludge or flocculent sludge.
6. The electrochemical-assisted efficient composite desalination method according to claim 1, wherein in step 2), the aerobic biochemical sludge concentration is controlled to be 0.2-20g/L, preferably, in step 2), the aerobic biochemical sludge concentration is controlled to be 2-10 g/L.
7. The electrochemical-assisted efficient composite desalination method according to claim 1, wherein in the step 2), the dissolved oxygen is controlled to be 0.5-8mg/L, preferably, the dissolved oxygen is controlled to be 2-6 mg/L.
8. The electrochemical-assisted efficient composite desalination method of claim 1, wherein in the step 2), the aerobic retention time is controlled to be 6-120 hours; in the aerobic reaction treatment process, a part of salt in the sewage is combined with carbon dioxide and microorganisms in the air in water, mixed, attached or absorbed in aerobic biochemical sludge, then the aerobic biochemical sludge is discharged, a part of salt returns to the aerobic reaction treatment process for cyclic utilization, the concentration of the aerobic biochemical sludge is ensured, and the other part of salt is directly discharged or discharged after precipitation; for sodium ions, potassium ions and the like in the sewage, on one hand, the sodium ions, the potassium ions and the like are mixed in the aerobic biochemical sludge to serve as the aerobic biochemical substances of the aerobic biochemical sludge, and on the other hand, the sodium ions, the potassium ions and the like can be fixed in the aerobic biochemical sludge to be removed in a sludge discharge mode.
9. The electrochemical-assisted efficient composite desalination method of claim 1, wherein in the step 3), the voltage of the electrochemical reaction is 12-60 volts.
10. The electrochemical-assisted efficient composite desalination method according to claim 1, which is carried out by adopting the following processing devices:
the device includes:
the anaerobic reactor is used for carrying out anaerobic treatment on the wastewater, and partial salt substances in the wastewater fall into anaerobic sludge in the form of inorganic salt mud;
an aerobic water inlet of the aerobic biochemical reactor is communicated with an anaerobic water outlet of the anaerobic reactor through a pipeline so as to carry out aerobic treatment on the treated water, and an aerobic water outlet of the aerobic biochemical reactor outputs primary desalted water;
a sedimentation tank, a sedimentation water inlet of which is connected with an aerobic water outlet of the aerobic biochemical reactor through a pipeline and is used for carrying out sedimentation on the preliminary desalted water, and a sedimentation water outlet of which outputs the effluent after sedimentation;
and an electrochemical water inlet of the electrochemical reaction tank is connected with a water outlet of the sedimentation tank through a pipeline, salt in the water is separated out and adsorbed on the surface of the outer electrode, so that the salt in the wastewater is removed, an electrochemical water outlet of the electrochemical reaction tank is connected with a recycling water inlet of the recycling tank through a pipeline, and the treated fresh water enters the recycling tank for recycling.
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