CN115818878A - Industrial circulating sewage zero-discharge treatment device and treatment method - Google Patents
Industrial circulating sewage zero-discharge treatment device and treatment method Download PDFInfo
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- CN115818878A CN115818878A CN202211560691.1A CN202211560691A CN115818878A CN 115818878 A CN115818878 A CN 115818878A CN 202211560691 A CN202211560691 A CN 202211560691A CN 115818878 A CN115818878 A CN 115818878A
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Abstract
The invention discloses a zero discharge treatment device and a treatment method for industrial circulating sewage, which comprise the following steps: the system comprises a wastewater adjusting tank, a first reaction tank, a second reaction tank, a concentration tank, a tubular membrane system, an intermediate water tank, a reverse osmosis device, a concentrated water tank, an evaporative crystallization system and a stabilizing tank; wherein: the wastewater adjusting tank, the first reaction tank, the second reaction tank and the concentration tank are sequentially connected, a water inlet and a concentrated water discharge port of the tubular membrane system are in circulating connection with the concentration tank, a water production outlet of the tubular membrane system is connected with the intermediate water tank, the intermediate water tank is connected with the reverse osmosis device, the concentrated water discharge port of the reverse osmosis device is divided into two branches, one branch is connected with the concentrated water tank, and the other branch is connected with the wastewater adjusting tank; the concentrated water tank, the mother liquor discharge port of the evaporative crystallization system and the stabilization tank are sequentially connected. The processing device has the advantages of high operation reliability, low equipment investment, low operation cost and convenient management and operation.
Description
Technical Field
The invention relates to the field of sewage treatment equipment, in particular to a zero-discharge treatment device and a treatment method for industrial circulating sewage.
Background
At present, the amount of sewage discharged by circulating water is reduced in a circulating cooling plant by adding a scale inhibitor and a stabilizer into circulating water inflow, adding acid into the circulating water, softening by-flowing water weak acid, softening by-flowing water lime and the like, but the problem of sewage discharge cannot be completely solved, and the generated wastewater accounts for 80-90% of the total utilization and external discharge capacity of a plant area. Although the salt content of the circulating water sewage is not high (about 1000-5000 mg/L), the scale of the circulating water sewage is relatively large, and the concentration ratio required by environmental protection is continuously improved, so that the risk of scaling of equipment such as a condenser and the like can be caused if the circulating water sewage is not treated in time. However, direct discharge of wastewater not only causes soil hardening and salinization, but also inhibits crops and microorganisms to a certain extent, thereby destroying ecological balance, and realizing zero discharge of factory wastewater is a problem to be solved urgently. In view of the characteristics of large discharge amount and stable salt content of the circulating sewage, the concentration ratio of the circulating cooling water and the recycling of the circulating sewage are improved, and the method is a main way for saving water and reducing pollution discharge at present.
The existing treatment process for the sewage of the factory circulating water mainly comprises pretreatment, an ion exchange method, pretreatment and multi-stage reverse osmosis. The obtained produced water is recycled, and the concentrated water is used for other purposes, such as wet desulphurization in the coal and electricity industry, coking coke quenching or waste steel slag cooling in steel enterprises, and further evaporation and crystallization treatment is needed if no digestion path exists. The ion exchange method reduces hardness by a transfer mode, generates a large amount of high-hardness regenerated acid-base waste liquid, and is not beneficial to water saving of a system. The multistage reverse osmosis process is high in production cost, the existence of hardness ions can cause membrane fouling and reduce membrane flux, and meanwhile, the increase of cleaning frequency can reduce the recovery rate of water. Therefore, the technology for zero discharge of the circulating water sewage becomes a research hotspot, but is limited by the treatment effect and the water quantity scale, the early stage investment of desalting the circulating water sewage is large, the water production cost is high, the system is complex, and the market demand is difficult to meet.
Disclosure of Invention
The invention provides a zero-discharge treatment device and a treatment method for industrial circulating sewage, and the technical scheme is as follows.
In a first aspect, the invention discloses an industrial circulating sewage zero-discharge treatment device, which comprises: the system comprises a wastewater adjusting tank, a first reaction tank, a second reaction tank, a concentration tank, a tubular membrane system, an intermediate water tank, a reverse osmosis device, a concentrated water tank, an evaporative crystallization system and a stabilizing tank. Wherein: the wastewater adjusting tank, the first reaction tank, the second reaction tank and the concentration tank are sequentially connected, the water inlet and the concentrated water outlet of the tubular membrane system are in circulating connection with the concentration tank, the produced water outlet of the tubular membrane system is connected with the intermediate water tank, and the intermediate water tank is connected with the reverse osmosis device. The concentrated water outlet of the reverse osmosis device is divided into two branches, wherein one branch is connected with the concentrated water tank, and the other branch is connected with the wastewater regulating tank. The concentrated water tank, the mother liquor discharge port of the evaporative crystallization system and the stabilization tank are sequentially connected.
Further, the device also comprises a sludge tank, and sludge discharge ports of the first reaction tank, the second reaction tank and the concentration tank are connected with the sludge tank, so that sludge generated by the devices is collected and treated uniformly.
Further, still include sludge dewaterer, this sludge impoundment with sludge dewaterer is connected, just sludge dewaterer's outlet is connected with the waste water equalizing basin to the product water that obtains to sludge dewatering carries out the retrieval and utilization.
Furthermore, the intermediate water tank and the reverse osmosis device are connected through a booster pump, a cartridge filter and a high-pressure pump in sequence, so that water pretreated in the intermediate water tank is sent to the reverse osmosis device for treatment. Preferably, the reverse osmosis membrane in the reverse osmosis device is a seawater desalination membrane or a high-pressure reverse osmosis membrane.
Further, the evaporative crystallization system comprises an MVR or TVR evaporative crystallization system.
In a second aspect, the invention discloses a treatment method of an industrial circulating sewage zero-discharge treatment device, which comprises the following steps:
(1) The wastewater adjusting tank temporarily stores circulating wastewater to be treated, the circulating wastewater is pumped into the first reaction tank, caustic soda and magnesium chloride are added to remove silicon ions, and the finished supernatant enters the second reaction tank.
(2) Adding soda into the supernatant in the second reaction tank to remove hardness ions and scale substances in water, feeding the supernatant into the concentration tank after the removal, then performing circulating concentration treatment on the sewage in the concentration tank by using the tubular membrane system, feeding the generated concentrated water into the concentration tank, and feeding the generated water into the intermediate water tank.
(3) And adjusting the pH value of the water in the intermediate water tank to 6-8 so as to reduce the scale formation of salt substances and reduce the hardness, thereby facilitating the reverse osmosis treatment. And pumping the water in the intermediate water tank into a reverse osmosis device for reverse osmosis treatment.
(4) And part of the concentrated water generated by the reverse osmosis device flows back to the wastewater regulating tank, the rest concentrated water is discharged into a concentrated water tank for temporary storage, and the concentrated water in the concentrated water tank is desalted by using the evaporative crystallization system. And the mother liquor generated by the evaporative crystallization system enters a stabilization tank, quicklime and the mother liquor are added to generate slaked lime combined water, heat is released to evaporate water in the mother liquor to form wet solid, and calcium fluoride formed by calcium ion reaction and precipitate formed by hydroxyl and heavy metal ions are carried, so that the stabilization of fluorine ions and heavy metal ions is realized.
Further, in the step (3), hydrochloric acid or sodium bisulfite is added to the water in the intermediate water pool to adjust the pH value.
Further, in the step (3), the tubular membrane system adopts a tubular ultrafiltration membrane process to circularly concentrate the sewage in the concentration tank.
Further, in the step (4), the reverse osmosis produced water generated by the reverse osmosis device flows back to the cooling tower for water replenishing and recycling.
Further, in the step (4), in the system starting stage, all the concentrated water generated by the reverse osmosis device flows back to the wastewater regulating reservoir for cyclic concentration, until the system operation is stable to 50000-150000 mg/L of salt content, part of the concentrated water flows back, the residual concentrated water is quantitatively discharged into the concentrated water tank, and then enters the subsequent evaporative crystallization system for evaporative crystallization treatment.
Compared with the prior art, the invention has the following beneficial effects:
1. the treatment method adopts a double-alkali method process of firstly adding caustic soda and magnesium chloride into the wastewater and then adding soda ash, so that silicon, hardness, heavy metal and organic matters are converted into colloidal sludge to be removed, and the process feasibility of high-rate concentration but no scaling of a subsequent tubular membrane system is ensured. Because the silica scale is not only a scale control factor of membrane concentration, but also a scale and pollution blocking factor of an evaporative crystallizer, the invention realizes removal in a pretreatment stage, and effectively lightens the burden of a tubular membrane system and an evaporative crystallization system.
2. The tubular membrane system of the treatment method adopts a tubular ultrafiltration membrane process, can bear high sludge concentration (2-5%) and extremely high pH value, and can work normally and stably under the condition that the pH value is strong alkali. In addition, precipitation and pre-filtration are not needed, the separation of solid particles and liquid can be realized by directly filtering, pollutants in water can be effectively removed without precipitation, and produced water can be directly sent to a subsequent treatment system without any further turbidity removal facility.
3. In the treatment method, the concentrated water generated by the reverse osmosis device completely flows back to the wastewater for regulation and cyclic concentration at the system starting stage until the system runs stably to the salt content of 50000-150000 mg/L, part of the concentrated water flows back, and the residual concentrated water is quantitatively discharged into the concentrated water tank and then enters the subsequent evaporative crystallization system for evaporative crystallization treatment. Therefore, after the hardness index is increased through reverse osmosis concentration, part of concentrated water flows back to the wastewater adjusting tank, the water inlet concentration of the system is improved, the hardness which cannot be removed originally can be removed through the pretreatment of the first reaction tank and the second reaction tank again, the process is not simple concentrated water circulation but includes circulation after pretreatment, the process flow is shortened, and the overall recovery rate of sewage is improved. In addition, through concentrated water circulation, the reverse osmosis recovery rate of a single membrane is not high, the reverse osmosis recovery rate can be adjusted to be between 60 and 80 percent by controlling the RO concentrated water amount, and the flexibility and the stability of system operation are enhanced. Compared with the traditional multistage reverse osmosis process equipment and the like, the industrial circulating sewage zero-discharge treatment device and the treatment method have the advantages of low equipment investment, low running cost and convenient management and operation.
4. According to the treatment process, quicklime is added into the mother liquor generated by the evaporative crystallization system, the quicklime and the mother liquor generate slaked lime combined water, heat is released to evaporate water in the mother liquor to form wet solid, a subsequent drying procedure is not needed, and the wet solid carries calcium fluoride formed by calcium ion reaction and precipitate formed by hydroxyl and heavy metal ions, so that the stability of the fluorine ions and the heavy metal ions is realized, the operation reliability is high, the equipment investment is low, the operation cost is low, and the management and the operation are convenient.
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 an industrial circulating sewage zero-discharge treatment apparatus in the following embodiment.
The labels in the figures represent: 1-a wastewater adjusting tank, 2-a first reaction tank, 3-a second reaction tank, 4-a concentration tank, 5-a tubular membrane system, 6-an intermediate water tank, 7-a reverse osmosis device, 8-a concentrated water tank, 9-an evaporative crystallization system, 10-a stabilizing tank, 11-a sludge tank and 12-a sludge dewatering machine.
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.
In the description of the present invention, the terms "lateral," "longitudinal," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings, and not for structural limitations, but merely for convenience in describing the invention, and do not indicate or imply that the referenced devices or elements need to have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention. The technical scheme of the invention is further explained by combining the drawings and the embodiment of the specification.
Referring to fig. 1, there is illustrated an industrial recycling sewage zero discharge treatment apparatus, including: the device comprises a wastewater adjusting tank 1, a first reaction tank 2, a second reaction tank 3, a concentration tank 4, a tubular membrane system 5, an intermediate water tank 6, a reverse osmosis device 7, a concentrated water tank 8, an evaporative crystallization system 9 and a stabilization tank 10. Wherein:
the wastewater adjusting tank 1, the first reaction tank 2, the second reaction tank 3 and the concentration tank 4 are connected in sequence. The wastewater adjusting tank 1 is mainly used for temporarily storing circulating sewage to be treated and subsequently discharging concentrated water of the reverse osmosis device 7 in an initial operation stage. The first reaction tank 2 is used for carrying out first-step pretreatment on the sewage from the wastewater adjusting tank 1 so as to remove silicon ions in the sewage. The second reaction tank 3 is used for carrying out second-step pretreatment on the sewage from the first reaction tank 2 so as to remove hardness ions and scaling substances in the water. The concentration tank 4 is used for receiving the sewage treated by the second reaction tank 3, and the sewage in the concentration tank 4 is subjected to circulating concentration treatment by the tubular membrane system 5, the generated concentrated water enters the concentration tank 4, and the generated water enters the intermediate water tank 6. Therefore, the water inlet and the concentrated water outlet of the tubular membrane system 5 are connected with the concentration tank 4 in a circulating way, and the produced water outlet of the tubular membrane system 5 is connected with the intermediate water tank 6. And the sewage in the concentration tank 4 enters an internal circulation type DF tubular membrane system 5 for concentration treatment after being pressurized by a circulating pump, the concentrated water continuously flows back to the concentration tank 4 to be mixed with the inlet water from the second reaction tank 3, the sludge generated in the concentration tank 4 can be periodically discharged, and the produced water enters the intermediate water tank 6 for further treatment.
The middle water tank 6 and the reverse osmosis device 7 are connected in sequence through a booster pump, a cartridge filter and a high-pressure pump. The sewage in the intermediate water tank 6 is boosted by the booster pump, enters the cartridge filter for filtration, is pressurized again by the pressure pump, enters the reverse osmosis device 7 for reverse osmosis treatment, and can be treated by a seawater desalination membrane or a high-pressure reverse osmosis membrane element. This reverse osmosis unit 7's dense water is arranged the mouth and is divided into two branch roads, one of them branch road with dense water tank 8 is connected, another branch road with waste water equalizing basin 1 is connected, and the initial stage with reverse osmosis unit 7 production dense water backward flow in the waste water equalizing basin 1 not only helps improving the system concentration of intaking, and the hardness that makes originally can not get rid of can get rid of through the pretreatment of first reaction tank 2, second reaction tank 3 once more in addition, has shortened process, has improved the sewage recovery rate, has strengthened system operation stability.
The concentrated water tank 8, the mother liquor discharge port of the evaporative crystallization system 9 and the stabilization tank 10 are connected in sequence. Wherein: the concentrated water tank 8 is used for receiving concentrated water from the reverse osmosis device 7, and after the concentrated water enters the evaporative crystallization system 9, the concentrated water is subjected to evaporative crystallization to recover salts of sewage. The evaporative crystallization system 9 adopts a forced circulation operation mode, the MVR technology or the TV technology can be selected as the process, and forced circulation is selected to improve the evaporation water quantity, reduce scaling and prolong the cleaning period, so that the process section of equipment is reduced, the economic efficiency is ensured, the number of the equipment is reduced, and the simplicity and convenience of system operation are improved. For example, if the MVR technique is selected, a three-way centrifugal compressor or roots type vapor compressor is selected, and the temperature rise of the vapor is more than 15 ℃. If the TVR technology is selected, the temperature of the steam at the outlet of the steam ejector is required to reach more than 120 ℃. The stabilizer 10 mainly used is to coming from evaporation crystallization system 9's mother liquor further processing, still contain some fluorinion, heavy metal ion etc. in the mother liquor, through adding quick lime to stabilizer 10, it with the mother liquor reaction back generates lime hydrate binding water to moisture in the heat evaporation mother liquor of release forms wet solid, need not subsequent drying process, moreover carry the precipitate that utilizes calcium fluoride that the calcium ion reaction formed, utilizes hydroxyl and heavy metal ion to form in the wet solid, has not only realized the stability of fluorinion, heavy metal ion, and operational reliability is high, equipment investment is low, the working cost is low, management convenient operation moreover.
Referring to fig. 1, in another embodiment, the industrial circulating sewage zero discharge treatment apparatus exemplified in the above embodiment further includes a sludge tank 11 and a sludge dewatering machine 12. Wherein: the sludge discharge ports of the first reaction tank 2, the second reaction tank 3 and the concentration tank 4 are all connected with the sludge tank 11, so that the sludge generated in the devices is collected and treated uniformly. The sludge tank 11 is connected with the sludge dewatering machine 12, and a water outlet of the sludge dewatering machine 12 is connected with the wastewater adjusting tank 1, so that produced water obtained by sludge dewatering is recycled.
Taking a circulating water sewage treatment pilot plant of a certain power plant as an example, the industrial circulating sewage zero-emission treatment device shown in figure 1 is adopted to treat the sewage, and the method specifically comprises the following steps:
(1) The circulating water discharges sewage (the water quantity is 3 m) 3 TDS of 2000 mg/L) into a wastewater adjusting tank 1 for temporary storage, then conveying the circulating sewage into a first reaction tank 2, adding caustic soda to adjust the pH value to 11, adding alkali into the alkaliAnd (3) continuously adding magnesium chloride under a sexual condition for mixing reaction for 1h to remove silicon elements in the circulating water sewage and prevent the silicon scale which is difficult to clean from influencing the subsequent treatment effect. After the completion, the supernatant in the first reaction tank 2 enters the second reaction tank 3.
(2) And 270mg/L of soda ash is added into the second reaction tank 3 to remove hardness ions and scale substances in water, the safety of RO membrane concentration is improved, the supernatant enters the concentration tank 4 after the concentration is finished, the supernatant is lifted to a tubular membrane system 5 by a circulating pump to carry out cross flow filtration, the aperture of an ultrafiltration membrane of the tubular membrane system 5 is 0.05 mu m, and 100% of pollutants such as SS (suspended solids) and suspended particles are intercepted. The tubular membrane system 5 adopts a tubular ultrafiltration membrane process, the SDI value of the outlet water treated by the tubular membrane system 5 is less than 2, and the outlet water meets the condition of entering a reverse osmosis device 7. The concentrated water produced by the tubular membrane system 5 enters the concentration tank 4, and the produced water enters the intermediate water tank 6.
(3) Hydrochloric acid is added into the intermediate water tank 6, the pH value of water is adjusted to 6.5, acid is added after the tubular membrane system 5 to adjust the pH value, almost all reaction precipitates can be intercepted by the ultrafiltration membrane, the problem of dissolution return is avoided, the hardness of effluent is greatly reduced, and reverse osmosis treatment is facilitated. Will the water in the middle pond 6 is hit reverse osmosis unit 7 and is carried out reverse osmosis treatment, and the whole backward flow of the reverse osmosis dense water that its produced 0.72t/h in system start earlier stage, through constantly circulating concentration with dense water salt content accumulation after stabilizing 50000mg/L, control dense water reflux is 0.6t/h, it gets into waste water equalizing basin 1 mixes with the circulating water blowdown water of 2000mg/L TDS among them, guarantees that the comprehensive salt content of system's influent water keeps about 10000mg/L among the steady operation process. By utilizing the internal reflux concentration of the system, the process chain is simplified, the recovery rate is improved, the scale of subsequent evaporative crystallization is reduced, 5 percent of equipment and production resources are saved, and the production investment and the operation cost are effectively controlled. And discharging the rest of the concentrated water generated by the reverse osmosis device 7 into a concentrated water tank 8 for temporary storage, and storing and recycling the reverse osmosis produced water generated by the reverse osmosis device 7.
(4) The concentrated water in the concentrated water tank 8 is desalted through the evaporation system 9 by adopting a TVR technology: the feeding scale is 0.12t/h, the salt content is 50300mg/L, the steam temperature at the outlet of the steam ejector is 130 ℃, the generated mother liquor (about 24L/h, the salt content is 251000 mg/L) enters a stabilization tank 10, quicklime and the mother liquor are added to generate slaked lime combined water, heat is released to evaporate water in the mother liquor to form wet solid, and calcium fluoride formed by calcium ion reaction and precipitate formed by hydroxyl and heavy metal ions are carried, so that the stabilization of fluoride ions and heavy metal ions is realized.
The sludge generated in the first reaction tank 2, the second reaction tank 3 and the concentration tank 4 is inorganic sludge, enters the sludge tank 11, and then enters the sludge dewatering machine 12 to be treated by a plate-and-frame filter press, and then the generated sludge cake is transported outside.
Finally, it should be understood that any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention. Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (10)
1. The utility model provides an industrial cycle blowdown water zero release processing apparatus which characterized in that includes: the system comprises a wastewater adjusting tank, a first reaction tank, a second reaction tank, a concentration tank, a tubular membrane system, an intermediate water tank, a reverse osmosis device, a concentrated water tank, an evaporative crystallization system and a stabilizing tank; wherein: the wastewater adjusting tank, the first reaction tank, the second reaction tank and the concentration tank are sequentially connected, a water inlet and a concentrated water discharge port of the tubular membrane system are in circulating connection with the concentration tank, a water production outlet of the tubular membrane system is connected with the intermediate water tank, the intermediate water tank is connected with the reverse osmosis device, the concentrated water discharge port of the reverse osmosis device is divided into two branches, one branch is connected with the concentrated water tank, and the other branch is connected with the wastewater adjusting tank; the concentrated water tank, the mother liquor discharge port of the evaporative crystallization system and the stabilization tank are sequentially connected.
2. The industrial circulating sewage zero-discharge treatment device as claimed in claim 1, further comprising a sludge tank, wherein the respective sludge discharge ports of the first reaction tank, the second reaction tank and the concentration tank are connected with the sludge tank.
3. The industrial circulating sewage zero emission treatment device of claim 1, further comprising a sludge dewatering machine, wherein the sludge tank is connected with the sludge dewatering machine, and a water outlet of the sludge dewatering machine is connected with a wastewater adjusting tank.
4. The industrial circulating sewage zero-emission treatment device as claimed in claim 3, wherein the intermediate water tank and the reverse osmosis device are connected in sequence through a booster pump, a cartridge filter and a high-pressure pump; preferably, the reverse osmosis membrane in the reverse osmosis device is a seawater desalination membrane or a high-pressure reverse osmosis membrane.
5. The zero emission treatment device of industrial circulating sewage according to any one of claims 1 to 4, wherein the evaporative crystallization system comprises an MVR or TVR evaporative crystallization system.
6. The method for treating sewage by using the industrial circulating sewage zero-discharge treatment device as claimed in any one of claims 1 to 5 is characterized by comprising the following steps:
(1) Temporarily storing the circulating sewage to be treated in the wastewater adjusting tank, pumping the circulating sewage into a first reaction tank, adding caustic soda and magnesium chloride to remove silicon ions, and feeding the finished supernatant into a second reaction tank;
(2) Adding soda ash into the supernatant in the second reaction tank to remove hardness ions and scale substances in water, feeding the supernatant into the concentration tank after the removal, then performing circulating concentration treatment on the supernatant in the concentration tank by using the tubular membrane system, feeding the generated concentrated water into the concentration tank, and feeding the generated water into the intermediate water tank;
(3) Adjusting the pH value of water in the intermediate water tank to 6-8 to reduce the scaling of salt substances and simultaneously reduce the hardness so as to facilitate reverse osmosis treatment; pumping the water in the intermediate water tank into a reverse osmosis device for reverse osmosis treatment;
(4) Part of the concentrated water generated by the reverse osmosis device flows back to the wastewater regulating tank, the rest concentrated water is discharged into a concentrated water tank for temporary storage, and the concentrated water in the concentrated water tank is desalted by using the evaporative crystallization system; and the mother liquor generated by the evaporative crystallization system enters a stabilization tank, quicklime and the mother liquor are added to generate slaked lime combined water, heat is released to evaporate water in the mother liquor to form wet solid, and calcium fluoride formed by calcium ion reaction and precipitate formed by hydroxyl and heavy metal ions are carried, so that the stabilization of fluorine ions and heavy metal ions is realized.
7. The method for treating wastewater according to claim 6, wherein the pH adjustment is carried out by adding hydrochloric acid or sodium bisulfite to the water in the intermediate pond in the step (3).
8. The method for treating sewage according to claim 6, wherein in the step (3), the tubular membrane system adopts a tubular ultrafiltration membrane process to perform circulating concentration treatment on the sewage in the concentration tank.
9. The method for treating wastewater according to claim 6, wherein in the step (4), the reverse osmosis produced water produced by the reverse osmosis device is returned to the cooling tower for water replenishing and recycling.
10. The method for treating sewage according to any one of claims 6 to 9, wherein in the step (4), all the concentrated water generated by the reverse osmosis device 7 in the system starting stage flows back to the wastewater regulating tank for cyclic concentration until the system operation is stabilized to the salt content of 50000-150000 mg/L, part of the concentrated water flows back, and the rest concentrated water is quantitatively discharged into the concentrated water tank and then enters the subsequent evaporative crystallization system for evaporative crystallization treatment.
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