CN107673531B - High-salt high-organic-matter wastewater thermal membrane coupling salt separation zero-discharge treatment process - Google Patents
High-salt high-organic-matter wastewater thermal membrane coupling salt separation zero-discharge treatment process Download PDFInfo
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F9/00—Multistage treatment of water, waste water or sewage
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- C01D3/00—Halides of sodium, potassium or alkali metals in general
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- C01D5/00—Sulfates or sulfites of sodium, potassium or alkali metals in general
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- C02F2101/30—Organic compounds
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
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Abstract
A high-salinity high-organic wastewater thermal membrane coupling salt separation zero-discharge treatment process comprises the steps that wastewater sequentially passes through a first heat exchanger and a second heat exchanger to enter a salt water membrane separator, concentrated water is conveyed to a first crystallizer, generated crystallized salt is conveyed to a mixed salt harmless treatment device to be incinerated, the incinerated mixed salt is washed by a mixed salt washing device and filtered by a mixed salt filtering device to form a salt solution, and the salt solution is conveyed to a nanofiltration device to be separated; conveying the sodium chloride solution to a second crystallizer, and conveying the generated crystallized salt to a sodium chloride salt recovery device for recovery; and conveying the sodium sulfate solution to a third crystallizer, and conveying the generated crystallized salt to a sodium sulfate salt recovery device. The invention fully utilizes the waste heat of the high-salinity high-organic-matter wastewater to form a thermal membrane coupling salt separation zero-discharge treatment system and a treatment process. The whole system only comprises four main process units of a brine membrane separator, a crystallizer, a mixed salt harmless treatment device and a nanofiltration salt separation system, and has the advantages of simple flow and simple and convenient operation.
Description
Technical Field
The invention belongs to the field of wastewater treatment, and particularly relates to a thermal membrane coupling salt separation zero-discharge treatment process for high-salinity high-organic wastewater.
Background
The wastewater discharged in the production process of the industries such as petrochemical industry, coal chemical industry, metallurgy, pharmacy, printing and dyeing, papermaking and the like has the characteristics of high salt and high organic matter, the salt content is usually more than 3000mg/L, the COD is more than 2000mg/L, the temperature is high, a large amount of toxic and harmful organic matters such as aromatic compounds, heterocyclic compounds, hydrocarbon compounds and the like are contained, and the potential safety hazard to the water environment can be still caused even if the wastewater is discharged into a water body after treatment. Therefore, many local governments require that such enterprises must achieve zero liquid discharge, referred to as zero discharge.
At present, the zero-emission treatment process for high-salt high-organic-matter wastewater generally comprises a series of process units such as heat exchange and cooling treatment, pretreatment, biochemical treatment, advanced oxidation, sand filtration, ultrafiltration, reverse osmosis and the like, in addition, concentrated water generated by the system is required to be oxidized, softened and concentrated, and finally, an evaporative crystallization process is adopted to form solid salt. The existing zero-emission treatment process has the defects of long flow, complex operation, poor stability, high energy and medicament consumption, large occupied area, high operation cost, difficult disposal of solid salt due to high organic matter content and the like, is difficult to stably operate for a long time, and has limited application range.
Disclosure of Invention
The invention aims to design a novel high-salinity high-organic wastewater thermal membrane coupling salt separation zero-discharge treatment process to solve the problems.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a high-salinity high-organic matter wastewater thermal membrane coupling salt separation zero-discharge treatment process comprises the following process flows:
the high-salinity high-organic-matter wastewater to be treated sequentially passes through the first heat exchanger and the second heat exchanger through the high-salinity high-organic-matter wastewater inlet pipeline to be heated, then enters the brine membrane separator through the water inlet of the brine membrane separator, is sprayed on the surface of the hydrophobic membrane, and under the action of the pressure difference of water vapor on two sides of the membrane, the water vapor penetrates through the membrane holes to enter the inner side of the membrane and is conveyed to the steam main pipe through the steam outlet of the brine membrane separator; the residual concentrated water in the brine membrane separator is heated by a first heating pipeline in the mixed salt harmless treatment device and then is conveyed to a water inlet of a first crystallizer;
the concentrated water forms supersaturated solution in the first crystallizer, the generated steam is conveyed to a steam header pipe, the generated crystallized salt is conveyed to the mixed salt harmless treatment device for incineration, and after the organic matter is incinerated, the residual mixed salt with the main component of inorganic component is obtained;
the mixed salt incinerated by the mixed salt innocent treatment device is washed by a mixed salt washing device and filtered by a mixed salt filtering device to form a salt solution, the salt solution is conveyed to a nanofiltration device to be separated, and the salt solution is separated into a sodium chloride solution and a sodium sulfate solution;
conveying the sodium chloride solution to a second heating pipeline in the mixed salt harmless treatment device for heating, conveying the sodium chloride solution to a second crystallizer, forming a supersaturated solution in the second crystallizer, conveying the generated steam to the steam header pipe, and conveying the generated crystallized salt to a sodium chloride salt recovery device for recovery; conveying the sodium sulfate solution to a third heating pipeline in the mixed salt harmless treatment device for heating, conveying the sodium sulfate solution to a third crystallizer, forming a supersaturated solution in the third crystallizer, conveying the generated steam to the steam header pipe, and conveying the produced crystallized salt to a sodium sulfate salt recovery device for recovery;
high-temperature steam in the steam header pipe passes through the first heat exchanger and then is conveyed to a condensate water recovery system;
high-temperature flue gas formed by incineration in the mixed salt harmless treatment device is conveyed to the flue gas header pipe after passing through a heater of the brine membrane separator, a heater of the first crystallizer, a heater of the second crystallizer and a heater of the third crystallizer respectively; and the flue gas main pipe conveys the cooled flue gas to a low-temperature flue gas recovery system after passing through the second heat exchanger.
Preferably, the concentrated water in the brine membrane separator is circulated on the surface of the hydrophobic membrane in the brine membrane separator through a concentrated water circulating device, so that the efficiency of water vapor permeation through the hydrophobic membrane is improved, and meanwhile, a scouring effect is formed on the surface of the hydrophobic membrane, and the hydrophobic membrane is prevented from being polluted and blocked by waste water.
Preferably, the concentrated water in the brine membrane separator is circulated through the concentrated water circulating device while filtering oil and suspended matters through an oil and suspended matter filter.
Preferably, the heating device of the mixed salt innocent treatment device adopts an electric heating mode or a gas heating mode.
Preferably, the brine membrane separator comprises a hydrophobic membrane, the steam outlet of the brine membrane separator is arranged on the steam side of the hydrophobic membrane, and the water inlet of the brine membrane separator and the water outlet of the brine membrane separator are both arranged on the brine side of the hydrophobic membrane.
Preferably, the high-temperature steam in the steam main pipe after passing through the first heat exchanger is cooled by a condenser and then conveyed to the condensate water recovery system.
Preferably, the high-salinity and high-organic-matter wastewater to be treated is filtered by a high-salinity and high-organic-matter wastewater filter and then sequentially heated by the first heat exchanger and the second heat exchanger.
The high-salt high-organic-matter wastewater in the invention refers to: the salt concentration is more than 3000mg/L, and the COD concentration is more than 2000 mg/L.
The sodium chloride salt recovery apparatus of the present invention is not limited to any specific form, and any apparatus capable of recovering, treating and utilizing sodium chloride salt can be used. The sodium sulfate salt recovery apparatus of the present invention is not limited to any specific form, and any apparatus capable of recovering, treating and utilizing sodium sulfate salt can be used.
The condensate recovery system of the present invention is not limited to any specific form, and is any system capable of recovering, treating, and utilizing condensate.
The beneficial effects of the invention can be summarized as follows:
(1) the invention provides a hot film coupling salt separation zero-discharge treatment process for high-salinity high-organic-matter wastewater, which realizes zero liquid discharge of the high-salinity high-organic-matter wastewater, forms sodium chloride and sodium sulfate which do not contain organic matters, and can be used as industrial raw materials.
(2) After the water vapor generated by the system is condensed, the water vapor can be used as water for production process or water supplement of a circulating cooling system, and the recovery rate of the produced water can reach more than 95%.
(3) The whole system only comprises four main process units of a brine membrane separator, a crystallizer, a mixed salt harmless treatment device and a nanofiltration salt separation system, and has the advantages of simple flow, small occupied area, simple and convenient operation and long-term stable operation.
(4) The system does not need the cooling to high salt high organic matter waste water, utilizes the waste heat of raw water to handle, sets up heat recovery system, and the waste heat of the steam that the make full use of system produced and high temperature flue gas is used for heating the feed liquid, and the design has heat exchange sleeve pipe in the mixed salt innocent treatment ware equipment, and the reaction waste heat that organic matter burns production in the make full use of solid salt, whole system heat utilization rate is high, energy saving and consumption reduction.
(5) No chemical agent is added during operation, no secondary pollution is caused, and the operation cost is low.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Wherein: 1 a first heat exchanger; 2 a second heat exchanger; 3, a brine membrane separator; 4, a mixed salt innocent treatment device; 5 a first crystallizer; 6 a second crystallizer; 7 a third crystallizer; 8 a steam main; 9 a flue gas main pipe; 8 heating the pipeline; 10 a condensate recovery system; 11 heater of brine membrane separator; 12 concentrated water circulating device; 13 a heater of the first crystallizer; 14 heater of the second crystallizer; 15 a heater of a third crystallizer; 16 a condenser; 17, a high-salt high-organic matter wastewater filter; 18 low temperature flue gas recovery system; 19 oil and suspended matter filters; 20 electric or gas heating means; 21 a first heating circuit; 22 a second heating circuit; 23 a third heating line; 24 mixed salt washing device; 25 mixed salt filtering device; 26 a nanofiltration device; 41 high-salt high-organic wastewater; 42 water vapor; 43 high-temperature flue gas; 44 mixed salt; 45, sodium chloride solution; 46 sodium sulfate solution; 47 sodium chloride salt recovery unit; 48 sodium sulfate recovery unit.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The high-salinity high-organic wastewater thermal membrane coupling salt separation zero-discharge treatment process shown in fig. 1 comprises the following process flows:
after being heated by the first heat exchanger 1 and the second heat exchanger 2 in sequence through the high-salt high-organic wastewater inlet pipeline, high-salt high-organic wastewater 41 to be treated enters the brine membrane separator 3 through the water inlet of the brine membrane separator 3, is sprayed on the surface of the hydrophobic membrane, and under the action of the pressure difference of water vapor on two sides of the membrane, water vapor enters the inner side of the membrane through membrane holes and is conveyed to the steam main pipe 8 through the steam outlet of the brine membrane separator 3; the residual concentrated water in the brine membrane separator 3 is heated by a first heating pipeline 21 in the mixed salt innocent treatment device 4 and then is conveyed to the water inlet of a first crystallizer 5;
the concentrated water forms supersaturated solution in the first crystallizer 5, the generated steam is conveyed to a steam header pipe 8, the generated crystallized salt is conveyed to the mixed salt innocent treatment device 4 for incineration, and after the organic matter is incinerated, the remaining mixed salt 44 with the main component of inorganic component;
the mixed salt 44 incinerated in the mixed salt innocent treatment device 4 is washed by the mixed salt washing device 24 and filtered by the mixed salt filtering device 25 to form a salt solution, and the salt solution is conveyed to the nanofiltration device 26 to be separated into a sodium chloride solution 45 and a sodium sulfate solution 46;
the sodium chloride solution 45 is conveyed to a second heating pipeline 22 in the mixed salt innocent treatment device 4 for heating, then conveyed to a second crystallizer 6, a supersaturated solution is formed in the second crystallizer 6, the generated steam is conveyed to a steam header pipe 8, and the generated crystallized salt is conveyed to a sodium chloride salt recovery device 47 for recovery; the sodium sulfate solution 46 is conveyed to a third heating pipeline 23 in the mixed salt innocent treatment device 4 for heating, then conveyed to a third crystallizer 7, supersaturated solution is formed in the third crystallizer 7, generated steam is conveyed to the steam header pipe 8, and produced crystallized salt is conveyed to a sodium sulfate salt recovery device 48 for recovery;
the high-temperature steam in the steam header pipe 8 passes through the first heat exchanger 1 and then is conveyed to a condensate water recovery system 10;
high-temperature flue gas 43 formed by incineration in the mixed salt innocent treatment device 4 is conveyed to the flue gas header pipe 9 after passing through the heater 11 of the brine membrane separator, the heater of the first crystallizer 5, the heater of the second crystallizer 6 and the heater of the third crystallizer 7 respectively; the flue gas main pipe 9 conveys the cooled flue gas to a low-temperature flue gas recovery system 18 after passing through the second heat exchanger 2.
In a more preferred embodiment, the concentrated water in the brine membrane separator 3 is circulated on the surface of the hydrophobic membrane inside the brine membrane separator 3 by a concentrated water circulating device, so that the efficiency of water vapor permeation through the hydrophobic membrane is improved, and meanwhile, a scouring effect is formed on the surface of the hydrophobic membrane, and the hydrophobic membrane is prevented from being polluted and blocked by wastewater.
In a more preferred embodiment, the concentrate in the brine membrane separator 3 is circulated through the concentrate circulating means 12 while filtering oil and suspended matter through the oil and suspended matter filter 19.
In a more preferred embodiment, the heating device of the mixed salt innocent treatment device 4 is heated by electric heating or gas heating.
In a more preferred embodiment, the brine membrane separator 3 comprises a hydrophobic membrane, the steam outlet of the brine membrane separator 3 is arranged on the steam side of the hydrophobic membrane, and the water inlet of the brine membrane separator 3 and the water outlet of the brine membrane separator 3 are both arranged on the brine side of the hydrophobic membrane.
In a more preferred embodiment, the high-temperature steam in the steam header 8 after passing through the first heat exchanger 1 is cooled by the condenser 16 and then delivered to the condensate recovery system 10.
In a more preferred embodiment, the high-salinity high-organic wastewater 41 to be treated is filtered by the high-salinity high-organic wastewater filter 17, and then sequentially passes through the first heat exchanger 1 and the second heat exchanger 2 to be heated.
In a specific embodiment, the high-salinity high-organic wastewater thermal membrane coupling salt separation zero-discharge treatment system and treatment process comprises the following steps:
(1) brine membrane separator 3: the high-salt high-organic-matter wastewater 41 with higher temperature enters the salt water membrane separator 3 after being filtered, is sprayed on the surface of the hydrophobic membrane, and water vapor enters the inner side of the membrane through membrane holes under the action of the pressure difference of the water vapor on the two sides of the membrane, and is collected by a water vapor pipeline, condensed by the condenser 16 to form desalted water with good water quality and reused in the production system. Due to the hydrophobicity of the membrane, the wastewater on the surface of the membrane cannot permeate the membrane to enter the inner side of the membrane, and strong brine rich in organic matters is formed on the outer side of the membrane, so that the brine separation of the wastewater is realized.
In order to improve the efficiency of brine separation and prevent the pollution of the membrane surface, a concentrated water circulation filtering device 12 is arranged outside the brine membrane separator 3, wastewater is circulated on the membrane surface inside the brine membrane separator 3 through a pump, the efficiency of water vapor permeating the membrane is improved, and meanwhile the circulating water flow forms a scouring effect on the membrane surface to prevent the membrane from being polluted and blocked by the wastewater. In addition, the concentrated water in the circulating part is subjected to the side filtering action of the oil and suspended matter filter 19 to remove suspended matters and oil, so that the membrane is further prevented from being polluted and blocked.
(2) First crystallizer 5: concentrated water to a certain degree is lifted by a pump and enters the first crystallizer 5 after being heated by the heat exchange sleeve of the mixed salt innocent treatment device 4 to form supersaturated solution, water vapor enters the collecting pipeline from the top of the first crystallizer 5 and is converged with the water vapor of the salt water membrane separator 3, and the desalted water with good water quality is formed by condensation of the condenser 16 and is reused in the production system. And (3) precipitating crystals from the residual concentrated solution in the first crystallizer 5, depositing solute in the concentrated solution on the surfaces of the crystals, gradually growing the crystals to form solid salt containing organic matters, and discharging the solid salt out of the first crystallizer 5.
(3) Mixed salt innocent treatment ware 4: the solid salt containing organic matter is sent to the mixed salt harmless treatment device 4 and is burnt by electric heating or gas heating, and the mixed salt 44 mainly containing inorganic components is formed after the organic matter in the solid salt is burnt. High-temperature flue gas 43 generated after the organic matter is incinerated is sent into a gas recovery system of an enterprise after heat exchange of the heat recovery system.
The mixed salt innocent treatment device 4 is internally designed with 3 sets of heat exchange sleeves, and aims to heat concentrated water discharged to the first crystallizer 5 from the salt water membrane separator 3, and sodium chloride solution 45 and sodium sulfate solution 46 of a subsequent nanofiltration salt separation system by utilizing reaction waste heat generated by burning organic matters in solid salt.
(4) A nanofiltration salt separation system: the mixed salt without organic matters is mainly sodium chloride and sodium sulfate, washed by a small amount of clear water and filtered, and then enters a nanofiltration system for salt separation. Since the nanofiltration membrane allows only monovalent salt to permeate through under pressure, and divalent salt is trapped on the concentrated water side, the salt solution is separated into sodium chloride solution 45 and sodium sulfate solution 46 after the nanofiltration membrane treatment.
The sodium chloride solution 45 is heated up by a heat exchange sleeve of the mixed salt innocent treatment device 4 and then enters the second crystallizer 6 to form supersaturated solution, the water vapor enters a collecting pipeline from the top of the second crystallizer 6 and is converged with the water vapor of the brine membrane separator 3 and the first crystallizer 5, and the water vapor is condensed by the condenser 16 to form desalted water with good water quality and then is reused in the production system. The residual concentrated solution is separated out into crystals in the second crystallizer 6, solute in the concentrated solution is deposited on the surfaces of the crystals, the crystals grow gradually to form solid salt mainly containing sodium chloride, and the solid salt is discharged out of the second crystallizer 6 and can be used as industrial raw materials.
The sodium sulfate solution 46 is heated by a heat exchange sleeve of the mixed salt harmless treatment device 4 and then enters the third crystallizer 7 to form a supersaturated solution, and the water vapor enters a collecting pipeline from the top of the third crystallizer 7, joins with the water vapor of the salt water membrane separator 3, the first crystallizer 5 and the second crystallizer 6, and is condensed by the condenser 16 to form desalted water with good water quality to be reused in the production system. And (3) precipitating crystals in the residual concentrated solution in the third crystallizer 7, depositing solute in the concentrated solution on the surfaces of the crystals, gradually growing the crystals to form solid salt mainly containing sodium sulfate, discharging the solid salt out of the third crystallizer 7, and using the solid salt as an industrial raw material.
(5) A heat recovery system: the system is an accessory facility of a main process system, consists of a heat exchanger and a pipeline and is mainly used for recycling redundant heat of the system. Wherein:
high-temperature water vapor generated by the brine membrane separator 3, the first crystallizer 5, the second crystallizer 6 and the third crystallizer 7 is collected by pipelines and then exchanges heat with raw water of high-salt high-organic wastewater 41 in the first heat exchanger 1, so that the temperature of the raw water is increased by utilizing the waste heat of the water vapor, and meanwhile, the water vapor is cooled to facilitate condensation.
The high-temperature flue gas 43 generated after the organic matters are incinerated by the mixed salt innocent treatment device is collected by a pipeline, and then exchanges heat with the concentrated water of the salt water membrane separator 3 and the residual concentrated solution of the first crystallizer 5, the second crystallizer 6 and the third crystallizer 7 respectively, and finally exchanges heat with the raw water of the high-salt high-organic-matter wastewater 41 in the second heat exchanger 2, so that the waste heat of the high-temperature flue gas 43 is utilized, the temperature of the five feed liquids is improved, and the temperature of the high-temperature flue gas 43 is reduced simultaneously.
The invention fully utilizes the waste heat of the high-salinity high-organic-matter wastewater to form a thermal membrane coupling salt separation zero-discharge treatment system and a treatment process. The whole system only has four main process units of a salt water membrane separator, a crystallizer, a mixed salt harmless treatment device and a nanofiltration salt separation system, the process is simple, the operation is simple and convenient, no chemical agent is added, the heat utilization rate is high, the occupied area is saved, the operation cost is low, sodium chloride salt and sodium sulfate salt which do not contain organic matters are formed, the sodium chloride salt and the sodium sulfate salt can be used as industrial raw materials, the operation can be stable for a long time, and the application range is wide.
The present invention has been described in detail with reference to the specific and preferred embodiments, but it should be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and any modifications, equivalents and the like, which are within the spirit and principle of the present invention, should be included in the scope of the present invention.
Claims (7)
1. A high-salinity high-organic matter wastewater thermal membrane coupling salt separation zero-discharge treatment process is characterized by comprising the following process flows:
the system comprises a first heat exchanger, a second heat exchanger, a brine membrane separator, a mixed salt harmless treatment device, a crystallizer, a steam main pipe, a flue gas main pipe, a first crystallizer, a second crystallizer, a third crystallizer, a mixed salt washing device, a mixed salt filtering device and a nanofiltration device;
the high-salinity high-organic-matter wastewater to be treated sequentially passes through the first heat exchanger and the second heat exchanger through the high-salinity high-organic-matter wastewater inlet pipeline to be heated, then enters the brine membrane separator through the water inlet of the brine membrane separator, is sprayed on the surface of the hydrophobic membrane, and under the action of the pressure difference of water vapor on two sides of the membrane, the water vapor penetrates through the membrane holes to enter the inner side of the membrane and is conveyed to the steam main pipe through the steam outlet of the brine membrane separator; the residual concentrated water in the brine membrane separator is heated by a first heating pipeline in the mixed salt harmless treatment device and then is conveyed to a water inlet of a first crystallizer;
the concentrated water forms supersaturated solution in the first crystallizer, the generated steam is conveyed to a steam header pipe, the generated crystallized salt is conveyed to the mixed salt harmless treatment device for incineration, and after the organic matter is incinerated, the residual mixed salt with the main component of inorganic component is obtained;
the mixed salt incinerated by the mixed salt innocent treatment device is washed by a mixed salt washing device and filtered by a mixed salt filtering device to form a salt solution, the salt solution is conveyed to a nanofiltration device to be separated, and the salt solution is separated into a sodium chloride solution and a sodium sulfate solution;
conveying the sodium chloride solution to a second heating pipeline in the mixed salt harmless treatment device for heating, conveying the sodium chloride solution to a second crystallizer, forming a supersaturated solution in the second crystallizer, conveying the generated steam to the steam header pipe, and conveying the generated crystallized salt to a sodium chloride salt recovery device for recovery; conveying the sodium sulfate solution to a third heating pipeline in the mixed salt harmless treatment device for heating, conveying the sodium sulfate solution to a third crystallizer, forming a supersaturated solution in the third crystallizer, conveying the generated steam to the steam header pipe, and conveying the generated crystallized salt to a sodium sulfate salt recovery device for recovery;
high-temperature steam in the steam header pipe passes through the first heat exchanger and then is conveyed to a condensate water recovery system; high-temperature flue gas formed by incineration in the mixed salt harmless treatment device is conveyed to the flue gas header pipe after passing through a heater of the brine membrane separator, a heater of the first crystallizer, a heater of the second crystallizer and a heater of the third crystallizer respectively; and the flue gas main pipe conveys the cooled flue gas to a low-temperature flue gas recovery system after passing through the second heat exchanger.
2. The high-salinity high-organic-matter wastewater thermal membrane coupling salt separation zero-discharge treatment process according to claim 1, characterized in that: the concentrated water in the brine membrane separator is circulated on the surface of the hydrophobic membrane in the brine membrane separator through a concentrated water circulating device, so that the efficiency of water vapor permeating the hydrophobic membrane is improved, and meanwhile, a scouring effect is formed on the surface of the hydrophobic membrane, and the concentrated water is prevented from being polluted and blocked by wastewater.
3. The high-salinity high-organic-matter wastewater thermal membrane coupling salt separation zero-discharge treatment process according to claim 2, characterized in that: and when the concentrated water in the brine membrane separator is circulated by the concentrated water circulating device, filtering oil and suspended matters through the oil and suspended matter filter.
4. The high-salinity high-organic-matter wastewater thermal membrane coupling salt separation zero-discharge treatment process according to claim 1, characterized in that: the heating mode of the heating device of the mixed salt harmless treatment device is electric heating or gas heating.
5. The high-salinity high-organic-matter wastewater thermal membrane coupling salt separation zero-discharge treatment process according to claim 1, characterized in that: the brine membrane separator comprises a hydrophobic membrane, a steam outlet of the brine membrane separator is arranged on the steam side of the hydrophobic membrane, and a water inlet of the brine membrane separator and a water outlet of the brine membrane separator are both arranged on the brine side of the hydrophobic membrane.
6. The high-salinity high-organic-matter wastewater thermal membrane coupling salt separation zero-discharge treatment process according to claim 1, characterized in that: and the high-temperature steam in the steam main pipe behind the first heat exchanger is cooled by the condenser and then conveyed to the condensate recovery system.
7. The high-salinity high-organic-matter wastewater thermal membrane coupling salt separation zero-discharge treatment process according to claim 1, characterized in that: and after being filtered by a high-salt high-organic wastewater filter, the high-salt high-organic wastewater to be treated sequentially passes through the first heat exchanger and the second heat exchanger for heating.
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| CN115872434A (en) * | 2021-09-22 | 2023-03-31 | 深圳市长隆科技有限公司 | Resourceful treatment method for sodium sulfate and sodium chloride type mixed salt |
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