CN113562909A - Salt-containing wastewater treatment system and treatment method - Google Patents
Salt-containing wastewater treatment system and treatment method Download PDFInfo
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- CN113562909A CN113562909A CN202010357978.9A CN202010357978A CN113562909A CN 113562909 A CN113562909 A CN 113562909A CN 202010357978 A CN202010357978 A CN 202010357978A CN 113562909 A CN113562909 A CN 113562909A
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- C02F9/00—Multistage treatment of water, waste water or sewage
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
- C02F1/4672—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
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- C—CHEMISTRY; METALLURGY
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- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
Abstract
The present disclosure relates to a salt-containing wastewater treatment system and a method, wherein the system comprises an evaporative crystallization device, a water-oil separation device, an oxidation treatment device, a harmless treatment device and a return pump; the evaporative crystallization device is provided with a circulating pipe, and a circulating pump and a steam heater are arranged on the circulating pipe. By adopting the method and the system disclosed by the invention, high-COD saline wastewater can be treated, and the generation amount of hazardous waste is small.
Description
Technical Field
The application relates to the field of high-salinity water treatment, in particular to a salt-containing wastewater treatment system and a salt-containing wastewater treatment method.
Background
The high-salinity wastewater widely exists in petrochemical and coal chemical enterprises, and has complex composition and high NH content3High salt content, high heavy metal content, high toxicity, high hardness, large water quantity, large water quality fluctuation range, large treatment difficulty and the like.
Generally speaking, the TDS (total dissolved salt content) of the high-salt wastewater is from tens of thousands ppm to one hundred thousand ppm, wherein two salts of sodium sulfate and sodium chloride are taken as main salts. The salt content of the high-salinity wastewater generally comes from circulating water pollution discharge, chemical water station drainage, salt-containing wastewater after biochemical treatment and the like; for the coal chemical industry, besides a large amount of saline sewage generated by coal gasification, a certain amount of acid and alkali are added in the sewage treatment process, and finally exist in high-salinity water in the form of sulfate and chloride.
In the prior art, most of salt in the high-salinity wastewater is crystallized and precipitated in a mixed salt mode, and analysis shows that the mixed salt contains substances such as heavy metals, organic matters, inorganic matters and the like. The mixed salt crystallized and separated from the high-salt water is defined as hazardous waste at the present stage, so that the mixed salt cannot be recycled, a professional hazardous waste manufacturer is required for treatment, the treatment cost is increased, and the risk of environmental pollution is also existed. Along with the moisture in the evaporative crystallizer is constantly evaporated, the salinity is raised, and simultaneously the COD concentration is constantly enriched, can't obtain pure crystal salt through conventional evaporative crystallization technique.
Therefore, the development of a device and a method for treating high-COD wastewater to recover the main salt in high-salt water and realize pollution-free discharge is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
The method aims to solve the problems of poor quality of salt separation, poor quality of reuse water, unstable operation of the device, high energy consumption and operation cost and long flow in the method for treating the salt-containing wastewater.
In order to achieve the above object, the present disclosure provides a salt-containing wastewater treatment system, which is characterized in that the system comprises an evaporative crystallization device, a water-oil separation device, an oxidation treatment device, a harmless treatment device and a return pump; the evaporative crystallization device is provided with a circulating pipe, and a circulating pump and a steam heater are arranged on the circulating pipe;
a salt-containing wastewater liquid outlet of the evaporative crystallization device is communicated with a liquid inlet of the water-oil separation device; an oily solution discharge port of the water-oil separation device is communicated with a liquid inlet of the oxidation treatment device, and a high organic matter saline water discharge port of the oxidation treatment device is communicated with a liquid inlet of the harmless treatment device;
the salt-containing solution discharge port of the water-oil separation device and the salt-containing solution discharge port of the oxidation treatment device are communicated with the liquid inlet of the return pump, the liquid outlet of the return pump and the stock solution liquid inlet of the system are communicated with the liquid inlet of the circulating pump, and the liquid outlet of the circulating pump is communicated with the evaporative crystallization device through the steam heater.
Optionally, a vertically arranged collector and a horizontally arranged baffle are arranged in the evaporative crystallization device, edges of the left side and the right side of the collector are connected with the inner wall of the evaporative crystallization device, edges of the baffle are respectively connected with the upper side edge of the collector and the inner wall of the evaporative crystallization device, and the collector, the baffle and the inner wall of the evaporative crystallization device together form a filtering area with a closed top end; and a salt-containing wastewater liquid outlet of the evaporative crystallization device is positioned in the filtering area.
Optionally, a salt-containing wastewater discharge port of the evaporative crystallization device is provided with a first valve, the inner wall of the filtering area is provided with a first interface level meter, and the first interface level meter controls the opening and closing of the first valve.
Optionally, the collector is a filter sheet comprising a screen comprising a johnson mesh and/or a wire mesh.
Optionally, a demister is arranged at the top of the evaporative crystallization device, and a washing water inlet is arranged at the top of the demister; and a steam outlet at the top of the evaporative crystallization device is provided with a steam online analyzer.
Optionally, a separation plate is arranged in the water-oil separation device, the separation plate is vertically arranged at the bottom of the water-oil separation device, the separation plate separates the water-oil separation device into an oil-water mixing area and an oily solution area, and the oil-water mixing area is communicated with the upper part of the oily solution area;
the liquid inlet of the water-oil separation device is positioned at the top of the oil-water mixing area, the oily solution outlet of the water-oil separation device is positioned at the bottom of the oily solution area, and the salt-containing solution outlet of the water-oil separation device is positioned at the bottom of the oil-water mixing area.
Optionally, the oil-water mixing area is provided with a second level gauge, and a salt-containing solution discharge port of the water-oil separation device is provided with a second valve; the second interface level meter controls the opening and closing of the second valve.
Optionally, the oxidation treatment device is one of an ozone oxidation device, a hydrogen peroxide oxidation device, a sodium hypochlorite oxidation device, a micro-electrolysis oxidation device, an electro-fenton oxidation device and an electro-catalytic oxidation device; the innocent treatment device is one of an incinerator, a drying device and a fixed sealing device.
Another aspect of the present disclosure provides a method for treating salt-containing wastewater, comprising the steps of:
a. conveying the raw liquid of the salt-containing wastewater to be treated to an evaporative crystallization device for evaporative crystallization treatment to obtain steam, salt-containing slurry and first salt-containing wastewater, and performing oil-water separation treatment on the first salt-containing wastewater to obtain second salt-containing wastewater and a first oily solution;
b. carrying out oxidation treatment on the first oily solution to obtain third salt-containing wastewater and a second oily solution;
c. mixing the second salt-containing wastewater and the third salt-containing wastewater to obtain mixed wastewater; and mixing the mixed wastewater with the subsequent saline wastewater stock solution to be treated, and then conveying the mixed wastewater to the evaporative crystallization device for evaporative crystallization treatment.
Optionally, the method further comprises the step of post-treating the second oily solution.
Optionally, the conditions of the evaporative crystallization treatment in step a include: the temperature is 40-180 ℃, the pressure is-0.095-0.9 MPaG, and the temperature is preferably 40 to 130 ℃, and the pressure is-0.095 to 0.3 MPaG; the oxidation treatment in the step b is ozone oxidation treatment; the ozone oxidation treatment is carried out in such a manner that the amount of ozone added is 0.00025 to 0.1Nm3Preferably, the amount of ozone added is 0.0004 to 0.05Nm3/L。
Through the technical scheme, compared with the prior art, the processing system and the processing method disclosed by the invention have the following advantages:
1. this disclosed processing system is through setting up the organic matter and containing the outer discharge line of salt waste water at the evaporation crystallization device, contains salt waste water to outer organic matter and divides liquid, oxidation treatment, and the salt waste water that contains after will handling returns the evaporation crystallization device, and the outer high organic matter of part contains salt waste water and carries out innocent treatment, can improve secondary steam quality and crystallization salt purity.
2. The treatment system and the treatment method disclosed by the invention can be used for treating high-COD saline wastewater, and the generation amount of hazardous waste is small.
3. The treatment system and the treatment method have the advantages of large water treatment amount, strong applicability, stable device operation, low energy consumption and operation cost, short flow, high quality of crystallized salt and the like, can realize zero discharge of high-salinity wastewater, and have great social benefit; in addition, the quality of the reuse water meets the industrial reuse water standard, the requirement of external water is reduced, and the overall economic benefit is improved.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
FIG. 1 is a schematic view of a salt-containing wastewater treatment system of example 1.
FIG. 2 is a schematic cross-sectional view of an evaporative crystallization apparatus in example 1.
Description of the reference numerals
1-heating steam, 2-condensate, 3-salt-containing slurry, 4-secondary steam, 5-first salt-containing wastewater, 6-second salt-containing wastewater, 7-circulating brine, 8-first oily solution, 9-second oily solution, 10-third salt-containing wastewater, 11-mixed wastewater, 12-stock solution to be treated, 13-washing water,
101-evaporative crystallization device, 101 a-collector, 101 b-baffle, 101 c-demister, 102-water-oil separation device, 102 a-separation plate, 103-oxidation treatment device, 104-innocent treatment device, 105-steam heater, 201-circulating pump, 202-return pump.
Detailed Description
The following describes in detail specific embodiments of the present disclosure. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
The first aspect of the present disclosure provides a salt-containing wastewater treatment system, which includes an evaporative crystallization device 101, a water-oil separation device 102, an oxidation treatment device 103, a harmless treatment device 104 and a return pump 202; the evaporative crystallization device 101 is provided with a circulation pipe on which a circulation pump 201 and a steam heater 105 are provided.
A salt-containing wastewater discharge port of the evaporative crystallization device 101 is communicated with a liquid inlet of the water-oil separation device 102; an oily solution discharge port of the water-oil separation device 102 is communicated with a liquid inlet of the oxidation treatment device 103, and a high organic matter saline water discharge port of the oxidation treatment device 103 is communicated with a liquid inlet of the innocent treatment device 104.
The salt-containing solution discharge port of the water-oil separation device 102 and the salt-containing solution discharge port of the oxidation treatment device 103 are communicated with the liquid inlet of the return pump 202, the liquid outlet of the return pump 202 and the stock solution liquid inlet of the system are communicated with the liquid inlet of the circulating pump 201, and the liquid outlet of the circulating pump 201 is communicated with the evaporative crystallization device 101 through the steam heater 105.
According to the disclosure, a vertically arranged collector 101a and a horizontally arranged baffle 101b are arranged in the evaporative crystallization device 101, edges of the left side and the right side of the collector 101a are connected with the inner wall of the evaporative crystallization device 101, edges of the baffle 101b are respectively connected with the upper side edge of the collector 101a and the inner wall of the evaporative crystallization device 101, and the collector 101a, the baffle 101b and the inner wall of the evaporative crystallization device 101 together form a filtering area with a closed top end; the salt-containing wastewater liquid outlet of the evaporative crystallization device 101 is positioned in the filtering area.
According to the present disclosure, the salt-containing wastewater discharge port of the evaporative crystallization device 101 is provided with a first valve, the inner wall of the filtering area is provided with a first level meter, and the first level meter controls the switch of the first valve.
Preferably, the collector 101a is a filter sheet comprising a screen comprising a johnson mesh and/or a wire mesh. The height h of the collector 101a is 0.5-2.0 m, preferably 0.8-1.5 m; the thickness m of the collector 101a is 0.05-0.5 m, preferably 0.1-0.3 m; the width n of the collector 101a is not more than d (diameter of the crystallizer), preferably n is 0.15-0.7 d.
According to the present disclosure, the evaporative crystallization apparatus 101 is composed of a straight cylinder section and a bottom cone section, and further, the top is preferably in a cone structure. The bottom conical section of the evaporative crystallization device 101 is provided with a salt-containing slurry outlet, and the top conical section is provided with a secondary steam outlet. A demister 101c is arranged at the top of the evaporative crystallization device 101, and a washing water inlet is arranged at the top of the demister 101 c; and a steam outlet at the top of the evaporative crystallization device 101 is provided with a steam online analyzer. According to the evaporative crystallization device 101 disclosed by the disclosure, the demister 101c is arranged at the top, so that liquid foam entrained in secondary steam leaving the evaporative crystallization device 101 can be further removed, and product loss, condensate pollution and pipeline blockage are avoided.
According to the present disclosure, the water-oil separator 102 may be in the form of a horizontal tank, a liquid bag is disposed at the bottom of the horizontal tank, a separation plate 102a is disposed in the water-oil separator 102, the separation plate 102a is vertically disposed at the bottom of the water-oil separator 102, and the height of the separation plate 102a is 0.3-0.9 times the diameter of the water-oil separator 102, and preferably, the height of the baffle is 0.5-0.7 times the diameter. The separation plate 102a separates the water-oil separator 102 into an oil-water mixing region and an oily solution region, and the oil-water mixing region communicates with the upper portion of the oily solution region.
The liquid inlet of the water-oil separation device 102 is positioned at the top of the oil-water mixing area, the oily solution outlet of the water-oil separation device 102 is positioned at the bottom of the oily solution area, and the salt-containing solution outlet of the water-oil separation device 102 is positioned at the bottom of the oil-water mixing area.
According to the present disclosure, the oil-water mixing area is provided with a second level gauge, and the salt solution discharge port of the water-oil separation device 102 is provided with a second valve; the second interface level meter controls the opening and closing of the second valve.
In an embodiment of the present disclosure, when the liquid level of the oil-water mixing region is higher than 80% of the height of the separation plate 102a, the second level meter controls the opening of the second valve, and the lower layer liquid of the oil-water mixing region is discharged through the saline solution discharge port of the water-oil separation device 102. When the liquid level of the oil-water mixing area is lower than 80% of the height of the separation plate 102a, the second level meter controls the closing of the second valve, the oil-water at the upper layer of the oil-water mixing area is separated to the oily solution area through the separation plate 102a and is discharged through an oily solution discharge port of the water-oil separation device 102.
According to the present disclosure, the oxidation treatment device 103 is one of an ozone oxidation device, a hydrogen peroxide oxidation device, a sodium hypochlorite oxidation device, a micro-electrolysis oxidation device, an electro-fenton oxidation device, and an electro-catalytic oxidation device; the innocent treatment device 104 is one of an incinerator, a drying device and a stationary sealing device, and is preferably an incinerator.
Another aspect of the present disclosure provides a method for treating wastewater containing salt, which may include the steps of:
a. conveying the raw liquid of the salt-containing wastewater to be treated to an evaporative crystallization device for evaporative crystallization treatment to obtain steam, salt-containing slurry and first salt-containing wastewater, and performing oil-water separation treatment on the first salt-containing wastewater to obtain second salt-containing wastewater and a first oily solution;
b. carrying out oxidation treatment on the first oily solution to obtain third salt-containing wastewater and a second oily solution;
c. mixing the second salt-containing wastewater and the third salt-containing wastewater to obtain mixed wastewater; and mixing the mixed wastewater with the subsequent saline wastewater stock solution to be treated, and then conveying the mixed wastewater to the evaporative crystallization device for evaporative crystallization treatment.
Preferably, the method further comprises the step of post-treating the second oily solution.
According to the present disclosure, the conditions of the evaporative crystallization treatment in step a include: the temperature is 40-180 ℃, the pressure is-0.095-0.9 MPaG, preferably, the temperature is 40-130 ℃, and the pressure is-0.095-0.3 MPaG; the oxidation treatment in the step b is ozone oxidation treatment; the ozone oxidation treatment is carried out in such a manner that the amount of ozone added is 0.00025 to 0.1Nm3Preferably, the amount of ozone added is 0.0004 to 0.05Nm3/L。
The following examples are provided to further illustrate the present disclosure, but the present disclosure is not to be construed as being limited thereby.
Example 1
The saline wastewater treatment system of the embodiment is shown in fig. 1 and fig. 2, and comprises an evaporative crystallization device 101, a water-oil separation device 102, an oxidation treatment device 103, a harmless treatment device 104 and a return pump 202; the evaporative crystallization apparatus 101 is provided with a circulation pipe on which an axial flow circulation pump 201 and a tube array steam heater 105 are provided.
A salt-containing wastewater liquid outlet of the evaporative crystallization device 101 is communicated with a liquid inlet of the water-oil separation device 102; an oily solution discharge port of the water-oil separation device 102 is communicated with a liquid inlet of the oxidation treatment device 103, and a high organic matter saline water discharge port of the oxidation treatment device 103 is communicated with a liquid inlet of the innocent treatment device 104; the salt-containing solution discharge port of the water-oil separation device 102 and the salt-containing solution discharge port of the oxidation treatment device 103 are communicated with a liquid inlet of a return pump 202, a liquid outlet of the return pump 202 and a raw liquid inlet of the system are communicated with a liquid inlet of a circulating pump 201, and a liquid outlet of the circulating pump 201 is communicated with the evaporative crystallization device 101 through the steam heater 105.
The evaporative crystallization apparatus 101 is composed of a straight section and a bottom conical section, and further, the top is preferably in a conical structure. The bottom conical section of the evaporative crystallization device 101 is provided with a salt-containing slurry outlet, and the top conical section is provided with a secondary steam outlet. The top of the evaporative crystallization device 101 is provided with a demister 101c, and the top of the demister 101c is provided with a washing water inlet; a steam outlet at the top of the evaporative crystallization device 101 is provided with a steam online analyzer. A vertically arranged collector 101a and a horizontally arranged baffle plate 101b are arranged in the evaporative crystallization device 101, the edges of the left side and the right side of the collector 101a are connected with the inner wall of the evaporative crystallization device 101, the edges of the baffle plate 101b are respectively connected with the upper side edge of the collector 101a and the inner wall of the evaporative crystallization device 101, and the collector 101a, the baffle plate 101b and the inner wall of the evaporative crystallization device 101 form a filtering area with a closed top end; the salt-containing wastewater discharge port of the evaporative crystallization device 101 is located in the filtering area. The salt-containing wastewater liquid discharge port of the evaporative crystallization device 101 is provided with a first valve, the inner wall of the filtering area is provided with a first interface level meter, and the first interface level meter controls the switch of the first valve. Wherein concentrator 101a is a Johnson network having a height h of 1.0m, a thickness m of 0.2m, and a width n of 0.4 d.
The water-oil separation device 102 adopts a horizontal tank form, the bottom of the water-oil separation device is provided with a liquid bag, a vertically arranged separation plate 102a is arranged in the device, and the height of the separation plate is 0.7 times of the diameter of the water-oil separation device. The separation plate 102a separates the water-oil separator 102 into an oil-water mixture region and an oily solution region. A second interface level meter is arranged in the oil-water mixing area, and a second valve is arranged at a salt-containing solution discharge port of the water-oil separation device 102; the second interface level meter controls the opening and closing of the second valve.
The oxidation treatment device 103 is an ozone oxidation device, and the innocent treatment device 104 is an incinerator.
The specific treatment method comprises the following steps: after the stock solution 12 to be treated enters an evaporative crystallization device through an axial flow circulating pump 201 and a tubular steam heater 105 for treatment, secondary steam 4, salt-containing slurry 3 and first salt-containing wastewater 5 are obtained; the first salt-containing wastewater 5 enters an oil-water separation treatment 102 to be separated to obtain second salt-containing wastewater 6 and a first oily solution 8; the first oily solution 8 enters an oxidation treatment device 103 for oxidation treatment to obtain third salt-containing wastewater 10 and a second oily solution 9; and (3) allowing the second oily solution 9 to enter a harmless treatment device 104 for harmless treatment, mixing the second salt-containing wastewater 6 and the third salt-containing wastewater 10 to obtain mixed wastewater 11, and conveying the mixed wastewater 11 to an evaporative crystallization device 101 for evaporative crystallization treatment, thereby completing the first circulation process. And subsequently repeating the steps, mixing the mixed wastewater 11 with the stock solution 12 to be treated to obtain circulating brine 7, and treating the circulating brine 7 in a tank body of the evaporative crystallization device 101. Wherein, the heating steam 1 heats the circulating brine 7 through a tube steam heater 105 to obtain a condensate 2; the washing water 13 washes the demister 101c through the washing water inlet port.
In the method, the operation temperature of the evaporative crystallization device 101 is 125 ℃, and the operation pressure is 0.15 MPaG. The heating steam 1 adopts 0.4MPaG low-pressure saturated steam as a heat source. The TDS of the stock solution 12 to be treated was 25000mg/L, and the COD of the stock solution to be treated was 1500 mg/L. The amount of ozone added was 0.0011Nm3/L。
COD in the secondary steam at the top of the evaporative crystallization device 101 was 65 mg/L. The product obtained by the embodiment has the salt purity of more than 95.5 percent and meets the first-grade standard of national solarization industrial salt.
Example 2
The system and method for treating salt-containing wastewater in this example are the same as those in example 1 except that: in this example, the TDS of the stock solution 12 to be treated was 65000mg/L, the COD of the stock solution to be treated was 2500mg/L, and the amount of ozone added was 0.004Nm3/L。
COD in the secondary steam at the top of the evaporative crystallization device 101 was 78 mg/L. The product obtained by the method has the salt purity of more than 95 percent and meets the first-grade standard of national solarization industrial salt.
Comparative example 1
The salt-containing wastewater treatment system of the comparative example comprises an evaporative crystallization device and an elutriation and purification device. The evaporation crystallization device is provided with a circulating pipe, an axial flow circulating pump and a tubular steam heater are arranged on the circulating pipe, and a salt-containing wastewater liquid outlet of the evaporation crystallization device 101 is connected with the elutriation purification device.
The specific method comprises the following steps: the operating temperature of the evaporative crystallization apparatus was 125 ℃ and the operating pressure was 0.15 MPaG. The heating steam adopts 0.4MPaG low-pressure saturated steam as a heat source.
COD in the secondary steam at the top of the evaporation crystallization device is 350mg/L, and after passing through the elutriation and purification device, the purity of the product salt can reach 92 percent, thereby meeting the secondary standard of national solarization industrial salt. However, the secondary steam has high COD value and can not be directly recycled, and further treatment is needed. And as the time of evaporative crystallization is passed, the COD value in the evaporative crystallization device is gradually increased, and the purity of the crystallized salt is reduced.
The preferred embodiments of the present disclosure have been described in detail above, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, various possible combinations will not be separately described in this disclosure.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (10)
1. A saline wastewater treatment system is characterized by comprising an evaporative crystallization device (101), a water-oil separation device (102), an oxidation treatment device (103), a harmless treatment device (104) and a material returning pump (202); the evaporative crystallization device (101) is provided with a circulating pipe, and a circulating pump (201) and a steam heater (105) are arranged on the circulating pipe;
a salt-containing wastewater liquid outlet of the evaporative crystallization device (101) is communicated with a liquid inlet of the water-oil separation device (102); an oily solution discharge port of the water-oil separation device (102) is communicated with a liquid inlet of the oxidation treatment device (103), and a high organic matter saline water discharge port of the oxidation treatment device (103) is communicated with a liquid inlet of the innocent treatment device (104);
the salt-containing solution discharge port of the water-oil separation device (102) and the salt-containing solution discharge port of the oxidation treatment device (103) are communicated with the liquid inlet of the return pump (202), the liquid outlet of the return pump (202) and the stock solution liquid inlet of the system are communicated with the liquid inlet of the circulating pump (201), and the liquid outlet of the circulating pump (201) is communicated with the evaporative crystallization device (101) through the steam heater (105).
2. The system according to claim 1, characterized in that a vertically arranged collector (101a) and a horizontally arranged baffle (101b) are arranged in the evaporative crystallization device (101), the edges of the left and right sides of the collector (101a) are connected with the inner wall of the evaporative crystallization device (101), the edges of the baffle (101b) are respectively connected with the upper side edge of the collector (101a) and the inner wall of the evaporative crystallization device (101), and the collector (101a), the baffle (101b) and the inner wall of the evaporative crystallization device (101) together form a filtering area with a closed top end;
and a salt-containing wastewater liquid outlet of the evaporative crystallization device (101) is positioned in the filtering area.
3. The system according to claim 2, characterized in that the salt-containing wastewater discharge port of the evaporative crystallization device (101) is provided with a first valve, and the inner wall of the filtration zone is provided with a first level gauge which controls the opening and closing of the first valve.
4. The system according to claim 2, wherein the collector (101a) is a filter sheet comprising a screen comprising a Johnson mesh and/or a wire mesh.
5. The system according to claim 1, characterized in that the top of the evaporative crystallization device (101) is provided with a demister (101c), and the top of the demister (101c) is provided with a washing water inlet; and a steam outlet at the top of the evaporative crystallization device (101) is provided with a steam online analyzer.
6. The system according to claim 1, wherein a separation plate (102a) is arranged in the water-oil separation device (102), the separation plate (102a) is vertically arranged at the bottom of the water-oil separation device (102), the separation plate (102a) divides the water-oil separation device (102) into an oil-water mixing area and an oily solution area, and the oil-water mixing area is communicated with the upper part of the oily solution area;
the liquid inlet of the water-oil separation device (102) is positioned at the top of the oil-water mixing area, the oily solution outlet of the water-oil separation device (102) is positioned at the bottom of the oily solution area, and the salt-containing solution outlet of the water-oil separation device (102) is positioned at the bottom of the oil-water mixing area;
the oil-water mixing area is provided with a second level meter, and a salt-containing solution discharge port of the water-oil separation device (102) is provided with a second valve; the second interface level meter controls the opening and closing of the second valve.
7. The system according to claim 1, wherein the oxidation treatment device (103) is one of an ozone oxidation device, a hydrogen peroxide oxidation device, a sodium hypochlorite oxidation device, a micro-electrolysis oxidation device, an electro-fenton oxidation device and an electro-catalytic oxidation device; the innocent treatment device (104) is one of an incinerator, a drying device and a fixed sealing device.
8. A method for treating salt-containing wastewater is characterized by comprising the following steps:
a. conveying the raw liquid of the salt-containing wastewater to be treated to an evaporative crystallization device for evaporative crystallization treatment to obtain steam, salt-containing slurry and first salt-containing wastewater, and performing oil-water separation treatment on the first salt-containing wastewater to obtain second salt-containing wastewater and a first oily solution;
b. carrying out oxidation treatment on the first oily solution to obtain third salt-containing wastewater and a second oily solution;
c. mixing the second salt-containing wastewater and the third salt-containing wastewater to obtain mixed wastewater; and mixing the mixed wastewater with the subsequent saline wastewater stock solution to be treated, and then conveying the mixed wastewater to the evaporative crystallization device for evaporative crystallization treatment.
9. The method according to claim 8, characterized in that it further comprises a step of post-treating said second oily solution.
10. The method according to claim 8, wherein the conditions of the evaporative crystallization treatment in step a comprise: the temperature is 40-180 ℃, the pressure is-0.095-0.9 MPaG, preferably, the temperature is 40-130 ℃, and the pressure is-0.095-0.3 MPaG; the oxidation treatment in the step b is ozone oxidation treatment; the ozone oxidation treatment is carried out in such a manner that the amount of ozone added is 0.00025 to 0.1Nm3Preferably, the amount of ozone added is 0.0004 to 0.05Nm3/L。
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| CN116217017A (en) * | 2023-05-05 | 2023-06-06 | 深圳永清水务有限责任公司 | Oxidation and evaporative crystallization combined system for treating high-salt organic wastewater |
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