CN114920404A - Evaporation wastewater pretreatment process - Google Patents
Evaporation wastewater pretreatment process Download PDFInfo
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- CN114920404A CN114920404A CN202210369971.8A CN202210369971A CN114920404A CN 114920404 A CN114920404 A CN 114920404A CN 202210369971 A CN202210369971 A CN 202210369971A CN 114920404 A CN114920404 A CN 114920404A
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
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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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
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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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/02—Temperature
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/04—Flow arrangements
- C02F2301/043—Treatment of partial or bypass streams
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
Abstract
The invention relates to the technical field of waste water treatment before evaporation, in particular to a pretreatment process for evaporation waste water. Conveying the wastewater into a wastewater pool, and detecting the pH value of the wastewater; adding a pH value regulating solution according to the detection result, fully mixing the pH value regulating solution with the wastewater, and regulating the pH value of the wastewater in the wastewater pool; adding a flocculating agent into the wastewater pool, fully mixing the wastewater with the flocculating agent, and flocculating the wastewater; the wastewater in the wastewater tank is transmitted into a filtering tank through a first filtering pipe for pre-filtering treatment; detecting the temperature of the wastewater in the filter tank, and adjusting the temperature of the wastewater to enable the temperature of the wastewater to reach 25 ℃; the wastewater after temperature adjustment is subjected to secondary filtration treatment through a second filtration pipe; transferring the wastewater after the secondary filtration to an evaporator for evaporation treatment; and (4) conveying the residual wastewater after the secondary filtration into a wastewater pool through a water return pipe, and repeating the steps S1-S7 to filter the wastewater again.
Description
Technical Field
The invention belongs to the technical field of waste water treatment before evaporation, and particularly relates to a pretreatment process for evaporated waste water.
Background
At present, the treatment methods of wastewater include physical methods and chemical methods, physical methods such as adsorption methods; chemical methods such as oxidation, electrolysis, photocatalytic methods, and the like. With the development of industry, the amount of industrial wastewater produced is enormous. Industrial wastewater refers to wastewater, sewage and waste liquid produced in the process of industrial production, which contains industrial production materials, intermediates and products lost with water and pollutants produced in the production process. Because industrial wastewater contains a large amount of water-insoluble particles and water-soluble chemical pollutants, if the industrial wastewater is directly discharged to the outside, the industrial wastewater will pollute the environment and affect human health.
The prior art has the defects of poor treatment effect due to the fact that a treatment method for wastewater is generally single, and the wastewater cannot be effectively recycled, so that the utilization rate of the wastewater is low, water resource waste is generated, and the environment is polluted.
Disclosure of Invention
Aiming at the problems, the invention provides a pretreatment process for evaporation wastewater, which comprises the following steps:
s1, conveying the wastewater into a wastewater pool, and detecting the pH value of the wastewater;
s2, adding a pH value regulating solution according to the detection result, fully mixing the pH value regulating solution with the wastewater, and regulating the pH value of the wastewater in the wastewater pool;
s3, adding a flocculating agent into the wastewater tank to fully mix the wastewater with the flocculating agent, and flocculating the wastewater;
s4, conveying the wastewater in the wastewater tank into a filtering tank through a first filtering pipe for pre-filtering treatment;
s5, detecting the temperature of the wastewater in the filtering tank, and adjusting the temperature of the wastewater to 25 ℃;
s6, carrying out secondary filtration treatment on the wastewater after temperature adjustment through a second filter pipe;
s7, conveying the wastewater subjected to secondary filtration to an evaporator for evaporation treatment;
s8, transferring the residual wastewater after the secondary filtration into a wastewater pool through a water return pipe, and repeating the steps S1-S7 to filter the wastewater again.
Further, in the step 1, the wastewater is subjected to pH value detection through a pH detector, and a probe of the pH detector is arranged below the liquid level of the wastewater.
Further, when the pH value regulating solution and the wastewater in the step 2 are mixed, the wastewater needs to be mixed and stirred by stirring equipment when the flocculant and the wastewater in the step 3 are mixed, so that the wastewater, the pH value regulating solution and the flocculant are fully and uniformly mixed.
Further, agitated vessel includes puddler, stirring vane, seal box and motor, the seal box is installed in the wastewater disposal basin bottom, the motor is installed in the seal box, the puddler transmission is connected on the output of motor, stirring vane installs on the lateral wall of puddler, stirring vane is provided with a plurality of groups, a plurality of groups stirring vane uses the puddler to set up as central annular equidistance, the puddler passes through sealed bearing with the junction of seal box and is connected.
Furthermore, a micro-filtration membrane is arranged on the inner wall of the first filtration pipe in the step 4, the micro-filtration membrane is a high polymer polysulfone membrane, the pore diameter of the micro-filtration membrane is 0.1 μm, and the micro-filtration membrane is used for filtering suspended solids in the wastewater.
Further, in the step 5, the temperature of the wastewater is detected by a temperature measuring instrument, the temperature measuring instrument is a glass tube thermometer, and a metal protective sleeve is arranged outside the glass tube thermometer.
Furthermore, in the step 5, the temperature of the wastewater is adjusted through a heating pipe and a cooler, so that the temperature of the wastewater reaches 25 ℃, and the heating pipe and the cooler are both arranged at the bottom of the filtering tank.
Further, in step 6, a water pump is arranged on the inner wall of the second filtering pipe, and the water pump is a booster water pump and is used for adjusting the water inlet pressure of the second filtering pipe to enable the water inlet pressure to be adjusted to be 1.45 MPa.
Furthermore, in the step 6, a filtering membrane is further arranged on the inner wall of the second filtering pipe, the filtering membrane is a reverse osmosis membrane and is used for filtering the wastewater, so that the water quality of the filtered wastewater reaches the water quality standard of reuse water, and when the temperature of the wastewater is 25 ℃ and the water pressure is 1.45MPa, the reverse osmosis membrane has high filtering efficiency.
Further, in step 8, one end of the water return pipe is installed on the filtering pool, the other end of the water return pipe is installed on the wastewater pool, the water return pipe is respectively communicated with the filtering pool and the wastewater pool, and the electromagnetic valve is installed on the water return pipe.
The invention has the beneficial effects that:
according to the invention, the waste water in the filtering tank is transmitted into the waste water tank through the water return pipe and the water pump, and is filtered again with the waste water to be treated in the waste water tank, so that the waste water is effectively recycled, the utilization rate of the waste water is improved, and the waste of water resources and the environmental pollution are avoided.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a block flow diagram of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention provides a technical solution:
a pretreatment process for evaporation wastewater comprises the following steps:
s1, conveying the wastewater into a wastewater pool, and detecting the pH value of the wastewater;
and (3) detecting the pH value of the wastewater in the step (1) by a pH detector, wherein a probe of the pH detector is arranged below the liquid level of the wastewater.
The structure of the PH detector comprises a composite electrode and an amperemeter, wherein the composite electrode is also called an indicating electrode and a reference electrode, and the indicating electrode of the PH detector is generally a glass electrode. The glass electrode is sensitive to hydrogen ions in the solution, and a potential difference is generated in response to a change in the hydrogen ions. The function of the reference electrode is to provide a constant potential as a reference for the offset potential.
The PH meter, which is a component of the PH meter, measures the overall potential, captures small potential changes in the circuit with the greatest resistance, and represents the changes with an electric meter. In order to facilitate reading, the PH detector has a display function, that is, the output signal of the ammeter is converted into a PH reading.
The potential of the reference electrode of the PH detector is stable, so that under the condition that the temperature is kept stable, the potential of the galvanic cell consisting of the solution and the electrode is changed and is only related to the potential of the glass electrode, and the potential of the glass electrode depends on the PH value of the solution to be detected, so that the PH value of the PH solution can be obtained by measuring the potential change.
S2, adding a pH value regulating solution according to the detection result, fully mixing the pH value regulating solution with the wastewater, and regulating the pH value of the wastewater in the wastewater pool;
the neutralizing agent for adjusting the pH value of the acidic wastewater comprises lime, limestone, dolomite, sodium ammonium oxide, sodium carbonate and the like. The neutralizing agent for adjusting the pH value of the alkaline wastewater is sulfuric acid, hydrochloric acid and the like.
S3, adding a flocculating agent into the wastewater tank to fully mix the wastewater with the flocculating agent, and flocculating the wastewater;
the flocculant is generally alkaline, that is, the flocculant is combined with hydroxide ions in water to generate insoluble particles, and then pollutants in sewage are adsorbed to achieve the purpose of purifying water, so that the hydroxide ions in the water are continuously reduced, the hydrogen ions are increased, the pH is gradually reduced, and the acidic flocculant is vice versa.
Each flocculant has its appropriate pH range, and exceeding this range affects the flocculation effect. Such as polyacrylamide, cationic for acidic and neutral environments, anionic for neutral and basic, and nonionic for from strongly acidic to basic. Different flocculants have different requirements on the pH value.
The PH value concentration of waste water is adjusted according to the flocculating agent that uses, avoids the flocculation effect of flocculating agent to receive the influence, improves the flocculation effect of flocculating agent.
And (3) mixing and stirring the wastewater by using stirring equipment when the pH value regulating solution and the wastewater are mixed in the step 2 and the flocculating agent and the wastewater are mixed in the step 3, so that the wastewater, the pH value regulating solution and the flocculating agent are fully and uniformly mixed.
Agitated vessel includes puddler, stirring vane, seal box and motor, the seal box is installed in the wastewater disposal basin bottom, the motor is installed in the seal box, the puddler transmission is connected on the output of motor, stirring vane installs on the lateral wall of puddler, stirring vane is provided with a plurality of groups, a plurality of groups stirring vane uses the puddler to set up as central annular equidistance, the puddler passes through sealed bearing with the junction of seal box and is connected. The sealed bearing is used for preventing the waste water in the waste water pond from entering the sealed box, so that the damage of the motor is avoided, and the safety of the motor is improved.
When the wastewater is mixed with the pH value regulating solution, the motor drives the stirring rod and the stirring blade to rotate, the rotation rate is 60 revolutions per minute, and the rotation direction is clockwise rotation.
When the waste water and the flocculating agent are mixed, the motor drives the stirring rod and the stirring blade to rotate, the rotation rate is 45 revolutions per minute, and the rotation direction is firstly 45 circles clockwise and then 45 circles anticlockwise.
After the waste water and the flocculating agent are mixed, the waste water is precipitated, so that suspended solid in the waste water is precipitated to the bottom of a waste water tank.
S4, conveying the wastewater in the wastewater tank into a filtering tank through a first filtering pipe for pre-filtering treatment;
and 4, arranging a micro-filtration membrane on the inner wall of the first filtration pipe, wherein the micro-filtration membrane is a macromolecular polysulfone membrane, has a pore diameter of 0.1 mu m and is used for filtering solid suspended matters in the wastewater.
The polymer polysulfone membrane has good chemical stability, thermal stability and mechanical property, is mainly made of polyvinylidene fluoride, polyamide, polyether sulfone, polysulfone and other polymeric resin materials, and has the advantages of strong rigidity, high strength, creep resistance, stable size, heat resistance, acid and alkali resistance, good chlorine resistance, oxidation resistance and the like.
S5, detecting the temperature of the wastewater in the filter tank, and adjusting the temperature of the wastewater to 25 ℃;
and 5, detecting the temperature of the wastewater through a temperature detector, wherein the temperature detector is a glass tube thermometer, and a metal protective sleeve is arranged outside the glass tube thermometer.
The glass tube thermometer realizes temperature measurement by utilizing the principle of expansion with heat and contraction with cold, and has the advantages of simple structure, convenient use, high measurement precision and low price.
And 5, adjusting the temperature of the wastewater through a heating pipe and a cooler to enable the temperature of the wastewater to reach 25 ℃, wherein the heating pipe and the cooler are both arranged at the bottom of the filter tank.
The heating pipe is used for heating waste water, improves the temperature of waste water. The cooler is used for cooling waste water, reduces the temperature of waste water.
S6, carrying out secondary filtration treatment on the wastewater after temperature adjustment through a second filter pipe;
and 6, a water pump and a filtering membrane are arranged on the inner wall of the second filtering pipe, the water pump is arranged to be a booster water pump and used for adjusting the water inlet pressure of the second filtering pipe to enable the water inlet pressure to be adjusted to be 1.45MPa, the filtering membrane is arranged to be a reverse osmosis membrane and used for filtering the wastewater, the water quality of the filtered wastewater reaches the water quality standard of reuse water, and the reverse osmosis membrane is high in filtering efficiency when the temperature of the wastewater is 25 ℃ and the water pressure is 1.45 MPa.
The method comprises the steps of filling waste water in a booster water pump, starting a centrifugal pump, enabling an impeller to rotate rapidly, enabling blades of the impeller to drive the waste water to rotate, enabling the waste water to flow towards the outer edge of the impeller by means of inertia when the waste water rotates, enabling the impeller to suck the waste water from a suction chamber, enabling the waste water in the impeller to flow around the blades, enabling liquid to act on the blades in a flowing motion process, enabling the blades to act on the waste water by a force which is equal to the lifting force in magnitude and opposite in direction, enabling the waste water to flow out of the impeller by the force, and enabling kinetic energy and pressure energy of the waste water to be increased.
The reverse osmosis membrane can intercept substances larger than 0.0001 micron, is the finest membrane separation product, can effectively intercept all dissolved salt and organic matters with molecular weight larger than 100, and simultaneously allows water molecules to pass through.
The reverse osmosis membrane should have a high salt rejection at high flow rates; the mechanical strength is high and the service life is long; can play a role under lower operation pressure; can resist the influence of chemical or biochemical action; the influence of factors such as PH value, temperature and the like is small; the raw material for preparing the membrane is easy to obtain, the processing is simple and convenient, and the cost is low.
S7, conveying the wastewater subjected to secondary filtration to an evaporator for evaporation treatment;
and S8, conveying the residual wastewater after the secondary filtration to a wastewater pool through a water return pipe, and repeating the steps S1-S7 to filter the wastewater again.
In the step 8, one end of the water return pipe is arranged on the filtering pond, the other end of the water return pipe is arranged on the wastewater pond, the water return pipe is respectively communicated with the filtering pond and the wastewater pond, and the water return pipe is provided with an electromagnetic valve.
Be provided with the water pump on the wet return for in transmitting waste water to the wastewater disposal basin, filter once more with the waste water that needs to handle in the wastewater disposal basin, improved the utilization ratio of waste water, avoid the waste of water resource and the pollution of environment.
Although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A pretreatment process for evaporation wastewater is characterized in that: the method comprises the following steps:
s1, conveying the wastewater into a wastewater pool, and detecting the pH value of the wastewater;
s2, adding a pH value regulating solution according to the detection result, fully mixing the pH value regulating solution with the wastewater, and regulating the pH value of the wastewater in the wastewater pool;
s3, adding a flocculating agent into the wastewater tank to fully mix the wastewater with the flocculating agent, and flocculating the wastewater;
s4, conveying the wastewater in the wastewater tank into a filtering tank through a first filtering pipe for pre-filtering treatment;
s5, detecting the temperature of the wastewater in the filtering tank, and adjusting the temperature of the wastewater to 25 ℃;
s6, carrying out secondary filtration treatment on the wastewater after temperature adjustment through a second filter pipe;
s7, conveying the wastewater subjected to secondary filtration to an evaporator for evaporation treatment;
and S8, conveying the residual wastewater after the secondary filtration to a wastewater pool through a water return pipe, and repeating the steps S1-S7 to filter the wastewater again.
2. The pretreatment process for evaporation wastewater according to claim 1, wherein the pretreatment comprises the following steps: and (3) detecting the pH value of the wastewater in the step (1) by a pH detector, wherein a probe of the pH detector is arranged below the liquid level of the wastewater.
3. The pretreatment process for evaporation wastewater according to claim 1, wherein the pretreatment process comprises the following steps: and (3) mixing and stirring the wastewater by using stirring equipment when the pH value regulating solution and the wastewater are mixed in the step 2 and the flocculating agent and the wastewater are mixed in the step 3, so that the wastewater, the pH value regulating solution and the flocculating agent are fully and uniformly mixed.
4. The pretreatment process for evaporation wastewater according to claim 3, wherein the pretreatment process comprises the following steps: agitated vessel includes puddler, stirring vane, seal box and motor, the seal box is installed in the wastewater disposal basin bottom, the motor is installed in the seal box, the puddler transmission is connected on the output of motor, stirring vane installs on the lateral wall of puddler, stirring vane is provided with a plurality of groups, a plurality of groups stirring vane uses the puddler to set up as central annular equidistance, the puddler passes through sealed bearing with the junction of seal box and is connected.
5. The pretreatment process for evaporation wastewater according to claim 1, wherein the pretreatment comprises the following steps: and 4, arranging a micro-filtration membrane on the inner wall of the first filtration pipe, wherein the micro-filtration membrane is a polymer polysulfone membrane, has a pore diameter of 0.1 mu m and is used for filtering solid suspended matters in the wastewater.
6. The pretreatment process for evaporation wastewater according to claim 1, wherein the pretreatment process comprises the following steps: and 5, detecting the temperature of the wastewater through a temperature measuring instrument, wherein the temperature measuring instrument is a glass tube thermometer, and a metal protective sleeve is arranged outside the glass tube thermometer.
7. The pretreatment process for evaporation wastewater according to claim 1, wherein the pretreatment comprises the following steps: and 5, adjusting the temperature of the wastewater through a heating pipe and a cooler to enable the temperature of the wastewater to reach 25 ℃, wherein the heating pipe and the cooler are both arranged at the bottom of the filter tank.
8. The pretreatment process for evaporation wastewater according to claim 1, wherein the pretreatment comprises the following steps: and 6, arranging a water pump on the inner wall of the second filter pipe, wherein the water pump is a booster water pump and is used for adjusting the water inlet pressure of the second filter pipe to enable the water inlet pressure to be adjusted to be 1.45 MPa.
9. The pretreatment process of evaporation wastewater according to claim 8, wherein: and 6, a filtering membrane is further arranged on the inner wall of the second filtering pipe, the filtering membrane is a reverse osmosis membrane and is used for filtering the wastewater, so that the water quality of the filtered wastewater reaches the water quality standard of reuse water, and the reverse osmosis membrane has high filtering efficiency when the temperature of the wastewater is 25 ℃ and the water pressure is 1.45 MPa.
10. The pretreatment process for evaporation wastewater according to claim 1, wherein the pretreatment comprises the following steps: in the step 8, one end of the water return pipe is arranged on the filtering pond, the other end of the water return pipe is arranged on the wastewater pond, the water return pipe is respectively communicated with the filtering pond and the wastewater pond, and the water return pipe is provided with an electromagnetic valve.
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| CN202210369971.8A CN114920404A (en) | 2022-04-08 | 2022-04-08 | Evaporation wastewater pretreatment process |
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