CN106986488B - Dyeing and finishing comprehensive wastewater recycling treatment system and process - Google Patents
Dyeing and finishing comprehensive wastewater recycling treatment system and process Download PDFInfo
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- CN106986488B CN106986488B CN201710348982.7A CN201710348982A CN106986488B CN 106986488 B CN106986488 B CN 106986488B CN 201710348982 A CN201710348982 A CN 201710348982A CN 106986488 B CN106986488 B CN 106986488B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D3/00—Halides of sodium, potassium or alkali metals in general
- C01D3/04—Chlorides
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D5/00—Sulfates or sulfites of sodium, potassium or alkali metals in general
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/048—Purification of waste water by evaporation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
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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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
- C02F1/4693—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis
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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
- C02F1/72—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
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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Abstract
The invention discloses a dyeing and finishing comprehensive wastewater recycling treatment system, which comprises a membrane separation device, an ozone oxidation device, an electrodialysis device and an evaporation crystallization device which are sequentially connected, wherein the membrane separation device comprises a sand filtration device, a security filtration device and a nanofiltration device, and the nanofiltration device is provided with a concentrated solution inlet, a fresh water outlet and a concentrated solution outlet. The invention also discloses a dyeing and finishing comprehensive wastewater recycling treatment process, the dyeing and finishing comprehensive wastewater is firstly filtered by a sand filter device and a security filter device, enters a nanofiltration device for concentration, then enters an ozone oxidation device for ozone oxidation treatment after being treated by the nanofiltration device, enters an electrodialysis device for desalination treatment, and finally enters an evaporation crystallization device for evaporation crystallization to obtain industrial-grade sodium sulfate and sodium chloride. The dyeing and finishing comprehensive wastewater recycling treatment system and process have the advantages of high purity of recovered inorganic salt, good quality of recovered water, high recovery rate and low system energy consumption.
Description
Technical Field
The invention relates to the field of industrial sewage treatment, in particular to a dyeing and finishing comprehensive wastewater recycling treatment system and process.
Background
Along with the development of industry, the dyeing industry has a trend of increasing environmental pollution concentration and wastewater discharge, and contradictory to the trend is the dilemma of water resource shortage in China and whether the water resource can be recoveredThe recycling of waste water resources is the key to solve the contradiction. Aiming at the salt content (such as Cl) in the dyeing and finishing comprehensive wastewater-、SO4 2-、Na+、Ca2+Plasma) is high, and the pure water recycling and inorganic salt recovery technology for printing and dyeing wastewater treatment has become one of the hot points of the current wastewater treatment.
The existing recovery methods comprise a membrane separation technology, an evaporation technology, an electrodialysis technology and the like, and the methods have the following defects: the traditional single membrane separation technology is adopted for recovery, the salt content of the wastewater is not too high, and the problems of membrane pollution, serious scaling and the like exist; the known evaporation technology is an effective technology for realizing the treatment of industrial wastewater, but the evaporation belongs to a phase change process, so that the energy consumption is extremely high, and the operating cost is high; the electrodialysis technology is only applied, so that the investment is huge, the maintenance cost is high, and the problem that the fresh water cannot meet the national discharge standard exists.
At present, the application of the combined membrane technology in the aspect of industrial wastewater recycling is relatively wide, but the defects of incomplete overall process, low purity of recovered inorganic salt, low quality of recovered water, low recovery rate, high system energy consumption and the like exist. Therefore, the process characteristics of the combined membrane technology are systematically analyzed from the aspects of clean production, resource recycling and the like, so that the dyeing and finishing comprehensive wastewater treatment has better social benefit and market competitiveness.
Disclosure of Invention
The invention aims to provide a dyeing and finishing comprehensive wastewater recycling system and a dyeing and finishing comprehensive wastewater recycling process, which have the advantages of high purity of recovered inorganic salt, good quality of recovered water, high recovery rate and low energy consumption of the system, and have better social benefit and market competitiveness.
In order to achieve the above purpose, the solution of the invention is:
a dyeing and finishing comprehensive wastewater recycling treatment system comprises membrane separation equipment, ozone oxidation equipment, electrodialysis equipment and evaporative crystallization equipment which are sequentially connected, wherein the membrane separation equipment comprises a sand filtration device, a security filtration device and a nanofiltration device, and the nanofiltration device is provided with a concentrated solution inlet, a fresh water outlet and a concentrated solution outlet.
The nanofiltration device comprises a primary nanofiltration device and a secondary nanofiltration device, a concentrated solution outlet of the primary nanofiltration device is connected with a concentrated solution inlet of the secondary nanofiltration device, a concentrated solution inlet of the secondary nanofiltration device is also connected with a dilute brine outlet of the electrodialysis equipment, and a concentrated solution outlet of the secondary nanofiltration device is connected with a water inlet of the ozone oxidation equipment.
The ion exchange membrane in the electrodialysis device is a homogeneous membrane.
The evaporation crystallization equipment is one or more of a membrane distillation device, an MVR evaporation crystallization device and a multiphase evaporation crystallization device.
A process for reclaiming the synthetic sewage generated by dyeing and finishing features that the synthetic sewage is filtered by sand filter and safety filter, the large-particle impurities in the synthetic sewage are filtered, and then concentrated by nano-filter for concentration and desalination, the concentrated liquid after concentration is treated by nano-filter for ozone oxidization, the fresh water generated by desalting is recovered, the concentrated liquid after ozone oxidization is further desalted by electrodialysis equipment, and the concentrated liquid after secondary desalting is finally evaporated and crystallized by evaporative crystallizing equipment to obtain industrial sodium sulfate and sodium chloride.
When the salt content of the dilute brine generated when the electrodialysis device carries out secondary desalting treatment is reduced to be less than 10000 mg/L, the generated dilute brine enters the nanofiltration device again for desalting again.
And when the salt content of the concentrated solution in the electrodialysis device is more than 150000 mg/L, feeding the concentrated solution subjected to secondary desalting treatment into the evaporative crystallization device for evaporative crystallization.
After the technical scheme is adopted, the fresh water obtained through the desalination treatment of the nanofiltration device reaches the index of reuse water in the dyeing and finishing industry, and the salt content of the concentrated solution obtained through the concentration treatment is about 10 times of that of the raw water of the dyeing and finishing comprehensive wastewater at mostThen removing part of COD by ozone oxidation equipmentcrAnd then, desalting the concentrated solution in an electrodialysis device until the salt content is 10000 mg/L, returning the light salt water of the electrodialysis device to a nanofiltration device for further desalting, then, evaporating and crystallizing the concentrated solution subjected to secondary desalting in an evaporation crystallization device to obtain industrial sodium sulfate and sodium chloride, and recycling the produced water of the nanofiltration device and the condensed water generated in the evaporation crystallization process so as to achieve the optimal effect of recycling the dyeing and finishing comprehensive wastewater.
Therefore, the dyeing and finishing comprehensive wastewater recycling system and the dyeing and finishing comprehensive wastewater recycling process have the advantages of high purity of recovered inorganic salt, good quality of recovered water, high recovery rate and low system energy consumption, and have better social benefits and market competitiveness.
Drawings
FIG. 1 is a process flow diagram of a dyeing and finishing comprehensive wastewater recycling treatment system of the invention.
Detailed Description
In order to further explain the technical solution of the present invention, the present invention is explained in detail by the following specific examples.
A recycling treatment system for dyeing and finishing comprehensive wastewater comprises membrane separation equipment, ozone oxidation equipment, electrodialysis equipment and evaporative crystallization equipment which are sequentially connected, wherein the membrane separation equipment comprises a sand filtration device, a security filtration device and a nanofiltration device which are sequentially connected, the nanofiltration device comprises a primary nanofiltration device and a secondary nanofiltration device, a concentrated solution inlet of the primary nanofiltration device is connected with a wastewater outlet of the security filtration device, a concentrated solution outlet of the primary nanofiltration device is connected with a concentrated solution inlet of the secondary nanofiltration device, a concentrated solution inlet of the secondary nanofiltration device is also connected with a light salt water outlet of the electrodialysis equipment, and a concentrated solution outlet of the secondary nanofiltration device is connected with a water inlet of the ozone oxidation equipment. Preferably, the ion exchange membrane in the electrodialysis apparatus is a homogeneous membrane. The evaporation crystallization equipment is one or more combination of a membrane distillation device, an MVR evaporation crystallization device and a multi-phase evaporation crystallization device.
The sand filtering device, the security filtering device, the nanofiltration device, the ozone oxidation device, the electrodialysis device and the evaporative crystallization device are all known components in the field.
Specifically, the dyeing and finishing comprehensive wastewater recycling treatment system is used for treating the dyeing and finishing wastewater treated by a certain biochemical treatment plant, wherein the salt content of the dyeing and finishing wastewater is 2400 mg/LcrIs 80 mg/L, wherein Ca is2+Concentration 25 mg/L, Cl-The concentration is 162 mg/L4 2-The concentration is 1165 mg/L, Na+The concentration was 642 mg/L.
As shown in figure 1, the dyeing and finishing comprehensive wastewater recycling treatment process comprises the following steps:
(1) firstly, the dyeing and finishing comprehensive wastewater is filtered by a sand filter device and a security filter device, after large-particle impurities in the dyeing and finishing comprehensive wastewater are filtered, the wastewater sequentially enters a primary nanofiltration device and a secondary nanofiltration device for concentration and desalination, the fresh water generated after desalination treatment by the primary nanofiltration device and the secondary nanofiltration device meets the water quality and industry requirements of ' spinning and finishing industry reuse water quality Standard ' (FZ/T01107-2011) ', the quality of the fresh water can be used for industrial reuse water treatment, and the yield of a concentrated solution obtained by concentration treatment is 0.8m3/h，CODcr463 mg/L, Ca2+Concentration 220 mg/L, Cl-The concentration is 250 mg/L42-The concentration is 13500 mg/L, Na+The concentration was 3425 mg/L.
(2) Then the concentrated solution treated by the secondary nanofiltration device enters ozone oxidation equipment for ozone oxidation treatment, and the COD of the concentrated solution after the ozone oxidation treatmentcrThe content is reduced from 463 mg/L to 242 mg/L, and the level of the first-stage nanofiltration concentrated solution is reached.
(3) And (3) the concentrated solution after ozone oxidation enters electrodialysis equipment for secondary desalination treatment, and when the salt content of the desalted light salt water is reduced to 10000 mg/L, the concentrated solution enters the secondary nanofiltration device again for secondary desalination.
(4) And finally, when the salt content of the concentrated solution in the electrodialysis equipment is more than 150000 mg/L, feeding the concentrated solution subjected to secondary desalting treatment into evaporation crystallization equipment for evaporation crystallization to obtain industrial sodium sulfate and sodium chloride, and recycling condensed water generated in the evaporation crystallization process.
The above embodiments and drawings are not intended to limit the form and style of the present invention, and any suitable changes or modifications thereof by those skilled in the art should be considered as not departing from the scope of the present invention.
Claims (4)
1. The utility model provides a waste water resourceful treatment system is synthesized in dyeing and finishing which characterized in that: the device comprises membrane separation equipment, ozone oxidation equipment, electrodialysis equipment and evaporative crystallization equipment which are connected in sequence, wherein the membrane separation equipment comprises a sand filtration device, a security filtration device and a nanofiltration device, and the nanofiltration device is provided with a concentrated solution inlet, a fresh water outlet and a concentrated solution outlet; the nanofiltration device consists of a primary nanofiltration device and a secondary nanofiltration device, fresh water generated after desalination treatment of the primary nanofiltration device and the secondary nanofiltration device is recovered, a concentrated solution outlet of the primary nanofiltration device is connected with a concentrated solution inlet of the secondary nanofiltration device, a concentrated solution inlet of the secondary nanofiltration device is also connected with a fresh brine outlet of the electrodialysis equipment, a concentrated solution outlet of the secondary nanofiltration device is connected with a water inlet of the ozone oxidation equipment, concentrated solution subjected to secondary desalination treatment of the electrodialysis equipment enters the evaporative crystallization equipment for evaporative crystallization, and condensed water generated in the evaporative crystallization process is recycled;
when the salt content of the dilute brine generated when the electrodialysis equipment carries out secondary desalting treatment is reduced to be less than 10000 mg/L, the generated dilute brine enters the secondary nanofiltration device again for secondary desalting;
and when the salt content of the concentrated solution in the electrodialysis device is more than 150000 mg/L, feeding the concentrated solution subjected to secondary desalting treatment into the evaporative crystallization device for evaporative crystallization.
2. The dyeing and finishing comprehensive wastewater recycling treatment system according to claim 1, characterized in that: the ion exchange membrane in the electrodialysis device is a homogeneous membrane.
3. The dyeing and finishing comprehensive wastewater recycling treatment system according to claim 1, characterized in that: the evaporation crystallization equipment is one or more of a membrane distillation device, an MVR evaporation crystallization device and a multiphase evaporation crystallization device.
4. A dyeing and finishing comprehensive wastewater recycling treatment process is characterized in that: the dyeing and finishing comprehensive wastewater is firstly filtered by a sand filter device and a security filter device, large particle impurities in the dyeing and finishing comprehensive wastewater are filtered, then the large particle impurities enter a first-stage nanofiltration device and a second-stage nanofiltration device for concentration and desalination, a concentrated solution outlet of the first-stage nanofiltration device is connected with a concentrated solution inlet of the second-stage nanofiltration device, then the concentrated solution after the concentration treatment by the second-stage nanofiltration device enters an ozone oxidation device for ozone oxidation treatment, fresh water generated after the desalination treatment by the first-stage nanofiltration device and the second-stage nanofiltration device is recovered, then the concentrated solution after the ozone oxidation enters an electrodialysis device for secondary desalination treatment, the concentrated solution inlet of the second-stage nanofiltration device is also connected with a fresh salt water outlet of the electrodialysis device, finally the concentrated solution after the secondary desalination treatment enters an evaporative crystallization device for evaporative crystallization, and industrial-grade sodium sulfate and sodium, recycling condensed water generated in the evaporation crystallization process;
when the salt content of the dilute brine generated when the electrodialysis equipment carries out secondary desalting treatment is reduced to be less than 10000 mg/L, the generated dilute brine enters the secondary nanofiltration device again for secondary desalting;
and when the salt content of the concentrated solution in the electrodialysis device is more than 150000 mg/L, feeding the concentrated solution subjected to secondary desalting treatment into the evaporative crystallization device for evaporative crystallization.
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| CN107497300A (en) * | 2017-10-20 | 2017-12-22 | 陕西省石油化工研究设计院 | A kind of two-way separator of high strong brine NF membrane and method |
| CN107867707B (en) * | 2017-10-23 | 2019-08-09 | 天津大学 | The sub-prime method for crystallising of sodium sulfate in high purity and sodium chloride that resourcebility utilizes is extracted from high-salt wastewater |
| CN109052712A (en) * | 2018-08-17 | 2018-12-21 | 广东溢达纺织有限公司 | A kind of system and method handling simultaneously reuse textile industry qualified discharge water |
| CN109052796A (en) * | 2018-10-16 | 2018-12-21 | 江苏环保产业技术研究院股份公司 | A kind of high-COD waste water treatment zero draining technique with high salt and device |
| CN109896685B (en) * | 2019-04-23 | 2024-03-05 | 泉州师范学院 | Printing and dyeing high-concentration wastewater harmless treatment system and method |
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| KR20160004063A (en) * | 2014-07-02 | 2016-01-12 | 한국해양과학기술원 | Removal system of sulfate in seawater using ion exchange resin |
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