Membrane and evaporation crystallization integrated process with zero discharge of high-salinity industrial wastewater

Abstract

The invention relates to a membrane and evaporation crystallization integrated process with zero discharge of high-salinity industrial wastewater. The process is as below: carrying out ultrafiltration pretreatment on industrial wastewater and sending the wastewater to a reverse osmosis process through a high-pressure pump; reusing lateral infiltration water; conducting electrodialysis treatment on a concentrate subjected to several times of filtration; evaporating and crystallizing the materials obtained from electrodialysis concentration to obtain salt slurry and water; carry outing posttreatment on the salt slurry; and reusing condensed water. The process provided by the invention couples membrane and evaporation crystallization, not only can recover high quality purified water from industrial wastewater with high salinity but also can realize zero discharge of wastewater with high salinity, and has the characteristics of low energy consumption, low production cost and advanced process.

Description

technical field

[0001] The invention relates to a sewage treatment method, in particular to a zero-discharge process of high-salinity industrial wastewater integrated with membrane technology and evaporation crystallization, which uses membrane technology and evaporation crystallization integration technology to treat industrial wastewater produced in chemical fields such as chlor-alkali and papermaking , Recover high-quality clean water from high-TDS industrial wastewater to achieve zero discharge of high-salt wastewater. Background technique

[0002] At present, the treatment methods for industrial wastewater produced in chemical fields such as chlor-alkali, papermaking, and electroplating mainly include chemical precipitation, redox, membrane separation, and ion exchange, but these traditional processes are difficult to meet the requirements of zero discharge.

[0003] The so-called zero emission, as far as its content is concerned, on the one hand, it is necessary to con...

Examples

Embodiment 1

[0020] 1500mg / L for TDS, 5mg / L for SS, COD Cr Ultrafiltration pretreatment for 35mg / L industrial wastewater, using a hollow fiber organic membrane with a membrane pore size of 10nm to filter under the condition of a transmembrane pressure difference of 0.5MPa, the TDS of the produced water is 1500mg / L, and the SS is about 1mg / L. COD Cr The permeate after ultrafiltration pretreatment is transported to the reverse osmosis membrane filtration device through a high-pressure pump, and the polyamide reverse osmosis membrane is used for concentration treatment. The TDS of the concentrated water reaches 27000mg / L, and the COD Cr When it is 500mg / L, the concentration is stopped, and the TDS of the permeate side fresh water is 50mg / L, COD Cr The fresh water is reused; the permeate after reverse osmosis treatment is transported to the packed bed electrodialysis device through a high-pressure pump for concentration treatment, and the TDS in the concentrated water reaches 100,000 mg / L, an...

Embodiment 2

[0022] 4000mg / L for TDS, 50mg / L for SS, COD Cr Ultrafiltration pretreatment for 72mg / L industrial wastewater, using a tubular ceramic membrane with a membrane pore size of 100nm to filter under the condition of a transmembrane pressure difference of 0.1MPa, the TDS of the produced water is 4000mg / L, and the SS is 10mg / L. COD Cr The permeate after ultrafiltration pretreatment is sent to the reverse osmosis membrane filtration device through a high-pressure pump, and the cellulose acetate reverse osmosis membrane is used for concentration treatment. The TDS of concentrated water reaches 72000mg / L, COD Cr Stop concentration when it reaches 690mg / L, and the TDS of water measured by osmosis is 420mg / L, COD Cr The effluent from the permeate side is reused; the permeate after reverse osmosis treatment is transported to the bipolar membrane electrodialysis device through a high-pressure pump for concentration treatment. The TDS in the concentrated water reaches 172000mg / L, and the CO...

Embodiment 3

[0024] 2000mg / L for TDS, 30mg / L for SS, COD Cr Ultrafiltration pretreatment for 86mg / L industrial wastewater, using a roll-type organic membrane with a membrane pore size of 50nm to filter under the condition of a transmembrane pressure difference of 0.2MPa, the TDS of the produced water is 2000mg / L, and the SS is 4mg / L. COD Cr The permeate after ultrafiltration pretreatment is sent to the reverse osmosis membrane filtration device through a high-pressure pump, and the polyamide and cellulose acetate composite reverse osmosis membrane is used for concentration treatment until the TDS of the concentrated water reaches 36000mg / L. L. COD Cr When it reaches 950mg / L, the clean water on the permeate side is reused, and the TDS of the effluent on the permeate side is 235mg / L, and the COD Cr Concentrated water is 50mg / L; the concentrated water after reverse osmosis treatment is transported to the reverse electrode electrodialysis device through a high-pressure pump for concentration...

technical field

[0001] The invention relates to a sewage treatment method, in particular to a zero-discharge process of high-salinity industrial wastewater integrated with membrane technology and evaporation crystallization, which uses membrane technology and evaporation crystallization integration technology to treat industrial wastewater produced in chemical fields such as chlor-alkali and papermaking , Recover high-quality clean water from high-TDS industrial wastewater to achieve zero discharge of high-salt wastewater. Background technique

[0002] At present, the treatment methods for industrial wastewater produced in chemical fields such as chlor-alkali, papermaking, and electroplating mainly include chemical precipitation, redox, membrane separation, and ion exchange, but these traditional processes are difficult to meet the requirements of zero discharge.

[0003] The so-called zero emission, as far as its content is concerned, on the one hand, it is necessary to con...

Examples

Embodiment 1

[0020] 1500mg / L for TDS, 5mg / L for SS, COD Cr Ultrafiltration pretreatment for 35mg / L industrial wastewater, using a hollow fiber organic membrane with a membrane pore size of 10nm to filter under the condition of a transmembrane pressure difference of 0.5MPa, the TDS of the produced water is 1500mg / L, and the SS is about 1mg / L. COD Cr The permeate after ultrafiltration pretreatment is transported to the reverse osmosis membrane filtration device through a high-pressure pump, and the polyamide reverse osmosis membrane is used for concentration treatment. The TDS of the concentrated water reaches 27000mg / L, and the COD Cr When it is 500mg / L, the concentration is stopped, and the TDS of the permeate side fresh water is 50mg / L, COD Cr The fresh water is reused; the permeate after reverse osmosis treatment is transported to the packed bed electrodialysis device through a high-pressure pump for concentration treatment, and the TDS in the concentrated water reaches 100,000 mg / L, an...

Embodiment 2

[0022] 4000mg / L for TDS, 50mg / L for SS, COD Cr Ultrafiltration pretreatment for 72mg / L industrial wastewater, using a tubular ceramic membrane with a membrane pore size of 100nm to filter under the condition of a transmembrane pressure difference of 0.1MPa, the TDS of the produced water is 4000mg / L, and the SS is 10mg / L. COD Cr The permeate after ultrafiltration pretreatment is sent to the reverse osmosis membrane filtration device through a high-pressure pump, and the cellulose acetate reverse osmosis membrane is used for concentration treatment. The TDS of concentrated water reaches 72000mg / L, COD Cr Stop concentration when it reaches 690mg / L, and the TDS of water measured by osmosis is 420mg / L, COD Cr The effluent from the permeate side is reused; the permeate after reverse osmosis treatment is transported to the bipolar membrane electrodialysis device through a high-pressure pump for concentration treatment. The TDS in the concentrated water reaches 172000mg / L, and the CO...

Embodiment 3

[0024] 2000mg / L for TDS, 30mg / L for SS, COD Cr Ultrafiltration pretreatment for 86mg / L industrial wastewater, using a roll-type organic membrane with a membrane pore size of 50nm to filter under the condition of a transmembrane pressure difference of 0.2MPa, the TDS of the produced water is 2000mg / L, and the SS is 4mg / L. COD Cr The permeate after ultrafiltration pretreatment is sent to the reverse osmosis membrane filtration device through a high-pressure pump, and the polyamide and cellulose acetate composite reverse osmosis membrane is used for concentration treatment until the TDS of the concentrated water reaches 36000mg / L. L. COD Cr When it reaches 950mg / L, the clean water on the permeate side is reused, and the TDS of the effluent on the permeate side is 235mg / L, and the COD Cr Concentrated water is 50mg / L; the concentrated water after reverse osmosis treatment is transported to the reverse electrode electrodialysis device through a high-pressure pump for concentration...

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