CN114835352A - Zero-discharge treatment method for wastewater in automobile manufacturing industry - Google Patents
Zero-discharge treatment method for wastewater in automobile manufacturing industry Download PDFInfo
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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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
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Abstract
The invention relates to a treatment method for zero discharge of wastewater in the automobile manufacturing industry, belonging to the technical field of wastewater treatment. Comprises S1, carrying out coagulation/flocculation precipitation treatment and air flotation treatment on the production waste liquid; s2, carrying out comprehensive wastewater coagulation/flocculation precipitation treatment, comprehensive wastewater air flotation treatment and comprehensive wastewater pH reverse adjustment treatment on the production waste liquid and the production wastewater treated by the S1; s3, carrying out comprehensive wastewater hydrolysis acidification treatment and comprehensive wastewater contact oxidation precipitation treatment on the wastewater treated by the S2 and domestic sewage; s4, performing sand carbon filtration treatment, UF treatment and RO treatment on the wastewater treated by the S3 to obtain fresh water and concentrated water; s5, carrying out concentrated water dosing softening precipitation treatment, concentrated water sand carbon filtration treatment, concentrated water UF treatment and concentrated water RO treatment on the concentrated water of S4 to obtain fresh water and concentrated water; s6, carrying out concentrated water STRO treatment on the concentrated water of S5 to obtain fresh water and concentrated water; and S7, carrying out evaporation crystallization treatment on the concentrated water of S6 to obtain fresh water, thereby realizing the purpose of zero discharge of wastewater.
Description
Technical Field
The invention belongs to the technical field of wastewater treatment, and particularly relates to a treatment method for zero discharge of wastewater in automobile manufacturing industry.
Background
With the vigorous development of the domestic automobile industry, the whole automobile factory is used as a water consumer, the pollution discharge pressure is increasingly severe, and the treatment degree of waste water directly influences the local ecological environment. The water consumption of a single vehicle is an important assessment index of each factory, so that the whole factory wastewater is recycled, the zero emission of the whole factory wastewater is realized, and the trend is increasingly formed.
The waste water of the whole automobile factory of the automobile has the characteristics of multiple types, large change of discharge amount, complex components, unstable discharge concentration, high pollution degree and the like, the maximum treatment and reuse proportion of the waste water (including domestic sewage) of the whole automobile factory in China at present is 70%, zero discharge of the waste water of the whole factory cannot be realized, the water consumption of a single automobile cannot be reduced to the maximum extent, and the utilization rate of resources is insufficient. Therefore, the research of a zero-emission process with high stability, low operation cost and strong operability becomes a research hotspot in the field of wastewater treatment of the whole automobile plant.
Disclosure of Invention
Therefore, the invention aims to solve the technical problems of low wastewater treatment and reuse proportion, poor stability and high operation cost in the prior art.
In order to solve the technical problem, the invention provides a treatment method for zero discharge of wastewater in the automobile manufacturing industry. Based on a multi-layer physicochemical system, a biochemical system, a common membrane system, a high-pressure membrane system and an evaporation system, the method is combined with the characteristics of the automobile wastewater, and a set of treatment method for zero discharge of the wastewater in the automobile manufacturing industry is designed.
An object of the present invention is to provide a treatment method for zero discharge of wastewater from automobile manufacturing including production waste, production waste and domestic sewage, the treatment method comprising the steps of,
s1, performing waste liquid coagulation/flocculation precipitation treatment and waste liquid air flotation treatment on the production waste liquid;
s2, carrying out comprehensive wastewater coagulation/flocculation precipitation treatment, comprehensive wastewater air flotation treatment and comprehensive wastewater pH reverse adjustment treatment on the production waste liquid treated by the S1 and the production wastewater;
s3, carrying out comprehensive wastewater hydrolysis acidification treatment and comprehensive wastewater contact oxidation precipitation treatment on the wastewater treated by the S2 and the domestic sewage;
s4, performing sand carbon filtration treatment, UF treatment and RO treatment on the wastewater treated by the S3 to obtain fresh water and concentrated water;
s5, carrying out concentrated water dosing softening precipitation treatment, concentrated water sand carbon filtration treatment, concentrated water UF treatment and concentrated water RO treatment on the concentrated water obtained in the step S4 to obtain fresh water and concentrated water;
s6, carrying out concentrated water STRO treatment on the concentrated water obtained in the S5 to obtain fresh water and concentrated water;
s7, carrying out evaporative crystallization treatment on the concentrated water obtained in the S6 to obtain fresh water.
In one embodiment of the invention, the production waste liquid is production waste liquid of each workshop of an automobile factory, and comprises inverted groove waste liquid of degreasing, electrophoresis, film, stamping and the like, and the waste liquid is collected uniformly and is connected to a waste liquid coagulation/flocculation treatment unit after uniform and uniform quantity is collected.
In one embodiment of the invention, the production wastewater is production wastewater of each workshop, comprises daily discharge wastewater of degreasing, electrophoresis, film, stamping and the like, is uniformly collected and homogenized, and is connected to a comprehensive wastewater coagulation/flocculation precipitation treatment unit.
In one embodiment of the invention, the domestic sewage is collected through a pipeline and mixed with the treated wastewater, and then the domestic sewage is connected to a comprehensive wastewater hydrolysis and acidification treatment unit.
In an embodiment of the present invention, in S1, the coagulation/flocculation treatment and the air flotation treatment of the waste liquid mainly remove most suspended particulate matters, metal ions, fluoride ions and floating oil in the waste liquid, and remove part of COD, and the supernatant and the production wastewater are output to the comprehensive wastewater coagulation/flocculation treatment unit.
In one embodiment of the invention, in S1, the pH is adjusted to 10-11, and alkali, calcium chloride, polyaluminium chloride (PAC) and polyacrylamide (PAM-) are added during the coagulation/flocculation precipitation treatment of the waste liquid; PAC and PAM are added in the air floatation treatment process of the waste liquid. The calcium chloride adding amount is 310ppm for 290-.
In an embodiment of the present invention, in S2, the comprehensive wastewater coagulation/flocculation treatment and the comprehensive wastewater air flotation treatment unit mainly remove most suspended particulate matters, metal ions, fluoride ions and floating oil in the comprehensive wastewater and remove part of COD, the pH of the supernatant is adjusted to 9-10 by the comprehensive wastewater pH reverse adjustment treatment, and the reversely adjusted wastewater and domestic sewage are output to the comprehensive wastewater hydrolysis acidification treatment unit.
In one embodiment of the invention, in S2, the pH is adjusted to 9-10, and alkali, calcium chloride, PAC and PAM are added during the coagulation/flocculation precipitation treatment of the comprehensive wastewater; PAC and PAM are added in the process of the comprehensive wastewater air flotation treatment. The calcium chloride dosage is 140-160ppm, the PAC dosage is 90-110ppm, the PAM-dosage is 35-45ppm, and the air floatation system adopts pressurized dissolved air type air floatation.
In one embodiment of the present invention, the time of the treatment is 15-20min in each of S1 and S2.
In one embodiment of the present invention, in S3, the integrated wastewater hydrolysis acidification treatment and the integrated wastewater contact oxidation treatment remove COD, TN and TP from the wastewater, and the supernatant is output to the sand carbon filter treatment unit.
In one embodiment of the present invention, in S3, the time of the hydrolytic acidification treatment of the integrated wastewater is 5-7 h; the time of the contact oxidation precipitation treatment of the comprehensive wastewater is 17-19h, and the sludge reflux ratio is 1-2.
In an embodiment of the present invention, in S4, the sand-carbon filter unit, the UF + RO treatment unit, mainly removing suspended solids, TDS, COD, TN, hardness, and fresh water in the wastewater, outputs to the reuse water supply system, and outputs the concentrated water to the concentrated water chemical softening treatment unit.
In one embodiment of the present invention, in S4, the sand carbon filtration treatment has an upflow velocity of 9 to 11 m/h.
In one embodiment of the present invention, in S4, the filtration pressure of the RO membrane during the RO treatment does not exceed 1.2MPa, and the recovery rate of the RO system is designed to be 70%.
In one embodiment of the present invention, in S5, the concentrated water is treated by adding chemicals to soften and precipitate, so as to remove most of the hardness in the concentrated water and ensure stable operation of the subsequent system.
In one embodiment of the present invention, in S5, the pH is adjusted to 11-12, and alkali, calcium chloride, sodium carbonate, polyaluminum chloride and polyacrylamide are added during the process of adding chemicals to the concentrated water for softening and precipitating. The addition amount of calcium chloride is 310ppm for 290- 3 /m 2 *h。
In an embodiment of the present invention, in S5, the concentrate sand carbon filtration + UF + RO treatment unit and the concentrate STRO treatment unit mainly remove suspended matters, TDS, COD, TN, hardness, and fresh water in the concentrate, and the concentrate is output to the reuse water supply system and the concentrate is output to the evaporative crystallization unit.
In one embodiment of the present invention, in S5, the upflow rate of the concentrated water sand carbon filtration treatment is 5 to 7 m/h; the filtration pressure of the RO membrane in the RO treatment process of the concentrated water is not more than 1.5MPa, and the recovery rate of the RO system is 60 percent.
In one embodiment of the present invention, in S6, the filtration pressure of the STRO membrane during STRO treatment does not exceed 7.5MPa, and the STRO system recovery is 70%.
In an embodiment of the present invention, in S7, the evaporative crystallization is to add chemicals to the concentrated water for softening, heat and concentrate, and output the condensate to the reuse water supply system. Wherein the process of adding the medicine for softening is the same as the process of adding the medicine for softening and precipitating the concentrated water.
In one embodiment of the present invention, in S7, the evaporation-concentration ratio during the evaporation crystallization is not less than 20 times. The evaporation system adopts an MVR evaporation system, and the liquid receiving material of the evaporation system is made of a dual-phase steel material.
Compared with the prior art, the technical scheme of the invention has the following advantages:
(1) the treatment method is applied to the treatment of the wastewater of the whole automobile plant for the first time, and the process unit system and the multi-dimensional design are utilized to provide the wastewater zero-discharge treatment process of the whole automobile plant, which has high stability, low operation cost and strong operability. Therefore, the water consumption of the single vehicle is reduced to the maximum extent, the cyclic utilization of resources is improved to the maximum extent, good environmental benefits are created for enterprises, and the burden of the enterprises is indirectly relieved.
(2) Realizing zero discharge of all waste water in the whole automobile factory in China, belonging to the first creation in China!
(3) The treatment method of the invention carries out centralized treatment after different types of wastewater are treated dispersedly, thereby overcoming the problems of unstable standard discharge and the like caused by large wastewater discharge variation and complex components in the direct centralized treatment process.
(4) The treatment method further increases the treatment processes of adding chemicals into concentrated water for softening, carrying out sand carbon filtration on the concentrated water, carrying out UF on the concentrated water, carrying out RO on the concentrated water, carrying out evaporation crystallization on the concentrated water, and the like on the basis of the currently widely adopted coagulation, biochemical treatment, UF and RO treatment, improves the water yield of the concentrated solution treatment, improves the effluent quality, solves the problems of large discharge amount of the concentrated solution, poor water quality and low water reuse rate in the traditional process, and realizes the purpose of zero discharge of the wastewater of the whole plant.
(5) The treatment method has the operation cost of about 12 yuan per ton of water, and greatly reduces the operation cost compared with the common zero-emission treatment cost of more than 20 yuan per ton of water in other industries.
Drawings
In order that the present disclosure may be more readily and clearly understood, reference is now made to the following detailed description of the present disclosure taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic process flow diagram of the treatment method for zero discharge of wastewater in automobile manufacturing industry.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
In the present invention, unless otherwise stated, UF is a shorthand of Ultrafiltration, which refers to an Ultrafiltration technique, and uses a pressure difference of 0.1-0.5MPa as a driving force, and uses the interception capability of a porous membrane to separate particles with different sizes by means of physical interception, thereby achieving the purpose of purifying, concentrating, and sieving different components in a solution.
In the present invention, unless otherwise stated, RO is a abbreviation for Reverse Osmosis, which refers to a Reverse Osmosis treatment technique, which is a membrane separation technique for separating a solvent from a solution using a pressure difference as a driving force, and has separation, extraction, purification and concentration functions.
In the present invention, unless otherwise specified, STRO is a shorthand for SpaceTube Reverse Osmosis, a pipe-grid Reverse Osmosis treatment technique for further concentrating the concentrated water to reduce the amount of concentrated water entering the evaporative crystallization device, thereby reducing evaporation and reducing the scale of the evaporative device.
In the present invention, unless otherwise stated, COD is a short hand for Chemical Oxygen Demand, which means the amount of oxidant consumed when a water sample is treated with a strong oxidant, and it is an index indicating the amount of reducing substances in water, and the reducing substances in water mainly mean organic substances, so COD is an index for measuring the amount of organic substances in water, and the larger the COD value is, the more serious the water body is polluted by organic substances.
In the present invention, unless otherwise indicated, TN is a shorthand for Total Nitrogen, referring to Total Nitrogen, and is the Total amount of various forms of inorganic and organic Nitrogen in water. Comprising NO 3 - 、NO 2 - And NH 4 + Inorganic nitrogen and organic nitrogen such as protein, amino acid and organic amine. The total nitrogen content is one of the important indexes for measuring water quality, and is often used for indicating the degree of the water body polluted by nutrient substances.
In the present invention, unless otherwise specified, TP is a shorthand for Total Phosphorus, referring to Total Phosphorus, which is the Total content of Phosphorus elements in a water body, and is mainly present in the form of phosphate. The total phosphorus content is one of the important indexes for measuring water quality, and is often used for indicating the degree of the water body polluted by nutrient substances.
In the present invention, unless otherwise indicated, TDS is a shorthand for Total Dissolved Solids and is the Total Dissolved Solids, which represents the Total solute content in the water, including both inorganic and organic content. Higher TDS values indicate more dissolved material in the water.
In the present invention, PAC is a shorthand for PolyAluminium Chloride, an inorganic polymeric coagulant, has high charge neutralization and bridging effects on colloids and particles in water, and can remove micro-toxic substances and heavy metal ions, unless otherwise specified.
In the present invention, unless otherwise stated, PAM-is a abbreviation for Polyacrylamide, which is Polyacrylamide, a high molecular polymer, used as a coagulant aid, and PAC is used in combination, so that the use amount of PAC can be reduced, and the PAM-is used for coagulation and clarification of suspended particles in water.
Examples
Referring to fig. 1, a method for zero-discharge treatment of wastewater from automobile manufacturing industry includes the following steps:
the processing unit includes: the device comprises a waste liquid coagulation/flocculation treatment unit, a waste liquid air flotation treatment unit, an integrated waste water coagulation/flocculation treatment unit, an integrated waste water air flotation treatment unit, an integrated waste water pH back-regulation treatment unit, an integrated waste water hydrolysis acidification treatment unit, an integrated waste water contact oxidation treatment unit, a sand carbon filtration treatment unit, an UF + RO treatment unit, a concentrated water dosing softening treatment unit, a concentrated water sand carbon filtration + UF + RO treatment unit, a concentrated water STRO treatment unit and an evaporation crystallization unit.
The process flow comprises the following steps: after the production waste liquid is collected uniformly, the production waste liquid is quantitatively connected to the input end of a waste liquid coagulation/flocculation treatment unit, and the output end of the waste liquid coagulation/flocculation treatment unit is connected with the input end of a waste liquid air floatation treatment unit; the output end of the waste liquid air-flotation treatment unit and the production wastewater are connected with the input end of the comprehensive wastewater coagulation/flocculation treatment unit; the output end of the comprehensive wastewater coagulation/flocculation treatment unit is connected with the input end of the comprehensive wastewater air-flotation treatment unit; the output end of the comprehensive wastewater air-flotation treatment unit is connected with the input end of the comprehensive wastewater pH reverse-adjustment treatment unit; the output end of the comprehensive wastewater pH reverse-adjustment treatment unit and the domestic sewage are connected with the input end of the comprehensive wastewater hydrolysis acidification treatment unit; the output end of the comprehensive wastewater hydrolysis acidification processing unit is connected with the input end of the comprehensive wastewater contact oxidation processing unit; the output end of the comprehensive wastewater contact oxidation treatment unit is connected with the input end of the sand carbon filter treatment unit; the output end of the sand carbon filtering processing unit is connected with the input end of the UF + RO processing unit; the fresh water output end of the UF + RO treatment unit is connected with a recycling water supply system, and the concentrated water output end is connected with the input end of a concentrated water dosing and softening treatment unit; the output end of the concentrated water dosing and softening treatment unit is connected with the input end of the concentrated water sand carbon filtration and UF + RO treatment unit; the fresh water output end of the concentrated water sand carbon filtration and UF + RO treatment unit is connected with a reuse water supply system, and the concentrated water output end is connected with the input end of a concentrated water STRO treatment unit; the fresh water output end of the concentrated water STRO treatment unit is connected with a recycling water supply system, and the concentrated water output end is connected with the input end of the evaporative crystallization unit; the condensate output end of the evaporative crystallization unit is connected with a recycling water supply system.
In EPC engineering for zero-discharge treatment of wastewater in certain automobile manufacturing base in south China, factory wastewater is divided into production waste liquid (electrophoresis, silane, stamping and degreasing), production wastewater (electrophoresis, silane and degreasing) and domestic sewage, wherein the waste liquid isThe treatment capacity was 10m 3 H, wastewater treatment capacity of 40m 3 Per hour, the domestic sewage treatment capacity is 25m 3 The zero-emission treatment process comprises the following steps:
s1, carrying out waste liquid coagulation/flocculation precipitation treatment and waste liquid air flotation treatment on the production waste liquid; sequentially adding liquid caustic soda, a calcium chloride solution, PAC and PAM to a wastewater coagulation/flocculation treatment unit; sequentially adding PAC and PAM to the wastewater air floatation treatment unit; wherein the pH value is about 10.5, the dosage of calcium chloride is 300ppm, the dosage of PAC is 220ppm, the dosage of PAM-is 100ppm, the residence time of each reaction section is 20min, and the air floatation system adopts pressurized dissolved air type air floatation.
S2, carrying out comprehensive wastewater coagulation/flocculation precipitation treatment, comprehensive wastewater air flotation treatment and comprehensive wastewater pH reverse adjustment treatment on the production waste liquid and the production wastewater treated by the S1, wherein the pH value is about 9.5; sequentially adding liquid caustic soda, a calcium chloride solution, PAC and PAM to the comprehensive wastewater coagulation/flocculation precipitation treatment unit; PAC and PAM are sequentially added into the comprehensive wastewater air floatation treatment unit; the dosage of calcium chloride is 150ppm, the dosage of PAC is 100ppm, the dosage of PAM-is 40ppm, the residence time of each reaction section is 15min, and a pressurized dissolved air type air floatation system is adopted.
S3, carrying out comprehensive wastewater hydrolysis acidification treatment and comprehensive wastewater contact oxidation precipitation treatment on the wastewater treated by the S2 and domestic sewage; the hydrolytic acidification retention time is 6h, the contact oxidation retention time is 18h, and the sludge reflux ratio is 1.5.
S4, carrying out sand carbon filtration treatment and UF + RO treatment on the wastewater treated by the S3 to obtain fresh water, outputting the obtained fresh water to a reuse water supply system, and treating concentrated water in the next step; the designed ascending flow rate of the sand carbon filter is 10m/h, the recovery rate of the RO system is 70 percent, and the maximum filtering pressure of the RO membrane is 1.2 MPa.
S5, carrying out concentrated water dosing softening precipitation treatment, concentrated water sand carbon filtration treatment and concentrated water UF + RO treatment on the concentrated water of S4, outputting the obtained fresh water to a reuse water supply system, and carrying out next treatment on the concentrated water; adding caustic soda liquid, calcium chloride, sodium carbonate, PAC and PAM-into the concentrated water dosing softening treatment unit in sequence, wherein the pH value is controlled to be 11-12, the dosage of the calcium chloride is 300ppm, and the carbonic acid is addedThe sodium dosage is 200ppm, PAC dosage is 150ppm, PAM-dosage is 30ppm, the precipitation adopts a high-efficiency Lameira sedimentation tank, and the surface load is 2.5m 3 /m 2 H. The treatment unit comprises concentrated water sand carbon filtration and UF + RO, the design ascending flow rate of the sand carbon filtration is 6m/h, the recovery rate of an RO system is 60%, and the maximum filtration pressure of an RO membrane is 1.5 MPa.
S6, carrying out concentrated water STRO treatment on the concentrated water of S5, outputting the obtained fresh water to a recycling water supply system, and carrying out next treatment on the concentrated water; the recovery rate of the STRO system is 70 percent, and the maximum filtration pressure of the STRO membrane is 7.5 MPa.
And S7, carrying out evaporative crystallization treatment on the concentrated water of S6, namely adding chemicals into the concentrated water for softening, heating for concentrating, and outputting condensate to a recycling water supply system. The evaporation system adopts an MVR evaporation system, the liquid receiving material of the evaporation system adopts a dual-phase steel material, and the evaporation concentration ratio is 30 times. The process of adding chemicals for softening is the same as S5.
Later-stage system debugging and running data display is carried out according to the inflow of 75m 3 Calculated by the/h, the operation cost of the whole system is about 11.5 yuan/ton water (including the expenses of manpower, medicament, electricity charge, equipment maintenance and the like), the system is stable in operation, and the recycled water quality is stable and reaches the standard (COD is less than 40mg/L, TDS is less than 1000mg/L, and the hardness is less than 450 mg/L).
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.
Claims (10)
1. A treatment method for zero discharge of wastewater from automobile manufacturing industry, wherein the wastewater from automobile manufacturing industry comprises production waste liquid, production waste water and domestic sewage, is characterized by comprising the following steps,
s1, performing waste liquid coagulation/flocculation precipitation treatment and waste liquid air flotation treatment on the production waste liquid;
s2, carrying out comprehensive wastewater coagulation/flocculation precipitation treatment, comprehensive wastewater air flotation treatment and comprehensive wastewater pH reverse adjustment treatment on the production waste liquid treated by the S1 and the production wastewater;
s3, carrying out comprehensive wastewater hydrolysis acidification treatment and comprehensive wastewater contact oxidation precipitation treatment on the wastewater treated by the S2 and the domestic sewage;
s4, performing sand carbon filtration treatment, UF treatment and RO treatment on the wastewater treated by the S3 to obtain fresh water and concentrated water;
s5, carrying out concentrated water dosing softening precipitation treatment, concentrated water sand carbon filtration treatment, concentrated water UF treatment and concentrated water RO treatment on the concentrated water obtained in the step S4 to obtain fresh water and concentrated water;
s6, carrying out concentrated water STRO treatment on the concentrated water obtained in the S5 to obtain fresh water and concentrated water;
s7, carrying out evaporative crystallization treatment on the concentrated water obtained in the S6 to obtain fresh water.
2. The method for zero-discharge treatment of wastewater from automobile manufacturing industry according to claim 1, wherein in S1, pH is adjusted to 10-11, and alkali, calcium chloride, polyaluminium chloride and polyacrylamide are added during coagulation/flocculation precipitation treatment of the waste liquid; and adding polyaluminium chloride and polyacrylamide in the air floatation treatment process of the waste liquid.
3. The method for treating zero discharge of wastewater from automobile manufacturing industry as claimed in claim 1, wherein in S2, pH is adjusted to 9-10, and alkali, calcium chloride, polyaluminium chloride and polyacrylamide are added during the coagulation/flocculation precipitation treatment of the comprehensive wastewater; and adding polyaluminium chloride and polyacrylamide in the process of the comprehensive wastewater air flotation treatment.
4. The method for zero-discharge treatment of wastewater from automobile manufacturing industry as claimed in claim 1, wherein in S3, the time for hydrolytic acidification treatment of the comprehensive wastewater is 5-7 h; the time of the contact oxidation precipitation treatment of the comprehensive wastewater is 17-19 h.
5. The method for zero-discharge of wastewater from automobile manufacturing industry according to claim 1, wherein the upward flow rate of the sand carbon filter treatment is 9-11m/h in S4.
6. The method for zero-discharge of wastewater from automobile manufacturing industry according to claim 1, wherein in S4, the filtration pressure of RO membrane during the RO treatment is not more than 1.2 MPa.
7. The method for treating zero discharge of wastewater from automobile manufacturing industry according to claim 1, wherein in S5, pH is adjusted to 11-12, and alkali, calcium chloride, sodium carbonate, polyaluminum chloride and polyacrylamide are added during the treatment of adding chemicals into the concentrated water for softening and precipitating.
8. The method for treating zero discharge of wastewater from automobile manufacturing industry according to claim 1, wherein in S5, the upflow rate of the concentrated water sand carbon filtration treatment is 5-7 m/h; the filtration pressure of the RO membrane in the RO treatment process of the concentrated water is not more than 1.5 MPa.
9. The method for zero-discharge treatment of wastewater from automobile manufacturing industry according to claim 1, wherein in S6, the filtration pressure of STRO membrane in STRO treatment process is not more than 7.5 MPa.
10. The method for zero-discharge treatment of wastewater from automobile manufacturing industry according to claim 1, wherein in S7, the ratio of evaporation concentration in the evaporation crystallization process is not less than 20 times.
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