Treatment method for crystallization and salt separation of thermoelectric reverse osmosis concentrated water

A technology for reverse osmosis concentrated water and a treatment method, which is applied in the field of thermoelectric reverse osmosis concentrated water crystallization and salt separation, can solve problems such as waste of resources, and achieve the effects of reducing the generation of hazardous waste, high salt separation efficiency, and promoting recycling.

Inactive Publication Date: 2020-12-25
CHAMBROAD CHEM IND RES INST CO LTD
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Problems solved by technology

[0009] Aiming at the shortcomings of the above-mentioned technologies, the present invention provides a treatment method for thermoelectric reverse osmosis concentrated water crystallization and salt separation. In this process, the thermoelectric reverse osmosis concentrated water is sequentially treated with activated carbon and ion exchange resin to reduce COD and hardness, and then use nano The filter membrane is used for salt separation, and the obtained nanofiltration concentrated water and nanofiltration product water are crystallized separately, and then the corresponding products are obtained. This process effectively reduces the influence of COD and hardness in RO concentrated water on the crystallized products. In addition, through nanofiltration, it effectively avoids the situation that when the ratio of sodium chloride to sodium sulfate in RO concentrated water is about 1, it is easy to crystallize and produce mixed salts that cannot be used and waste resources.

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  • Treatment method for crystallization and salt separation of thermoelectric reverse osmosis concentrated water

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Experimental program
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Effect test

Embodiment 1

[0037] After RO concentration in a thermal power plant, the concentrated water has a salt content of 11690mg / L, a COD content of 756mg / L, and a hardness of 1564mg / L. - : SO 4 2- = 0.97.

[0038] Its treatment process, concrete steps are as follows:

[0039] Adsorbed by the coconut shell activated carbon adsorption column, the flow rate of the feed liquid is 2BV, the iodine value of the coconut shell activated carbon is 950mg / g, and the COD content in the treated water is 26mg / L;

[0040] After dehardening by the ion exchange resin adsorption column, the hardness in the water is 17mg / L, and the flow rate of the feed liquid is 2BV;

[0041] The roll-type nanofiltration membrane separates salt, the pressure is controlled at 1.2Mpa, the water production rate is controlled at 89%, and the sulfate radical rejection rate is 98.85%. The purity of the obtained sodium chloride crystalline salt is 98.14%, reaching the standard of industrial qualified products; the yield is 46.97%;

...

Embodiment 2

[0044] After concentration of DTRO in the third phase of a thermal power plant, the concentrated water has a salt content of 42470mg / L, a COD content of 852mg / L, and a hardness of 2200mg / L. - : SO 4 2- = 0.93.

[0045] Its treatment process, concrete steps are as follows:

[0046] Use coconut shell activated carbon adsorption column for adsorption, the iodine value of coconut shell activated carbon is 950mg / g, the feed flow rate is controlled at 2BV, and the COD content in the water after adsorption is 42mg / L;

[0047] After dehardening by the ion exchange resin adsorption column, the hardness in the water is 36mg / L, and the flow rate of the feed liquid is 2BV;

[0048] The roll-type nanofiltration membrane separates salt, the pressure is controlled at 1.3Mpa, the water production rate is controlled at 93%, and the sulfate radical rejection rate is 98.77%. The purity of the obtained sodium chloride crystalline salt is 97.90%, reaching the standard of industrial qualified p...

Embodiment 3

[0051] The RO concentrated water of a power plant and a petrochemical electric dehydration mixed water sample, the salt content is 23240mg / L, the COD content is 509mg / L, the hardness is 1414mg / L, Cl - : SO 4 2- = 1.1.

[0052] Its treatment process, concrete steps are as follows:

[0053] Use coconut shell activated carbon adsorption column for adsorption, the iodine value of coconut shell activated carbon is 950mg / g, the feed flow rate is controlled at 2BV, and the COD content in water after adsorption is 29mg / L;

[0054] After dehardening by the ion exchange resin adsorption column, the hardness in the water is 31mg / L, and the flow rate of the feed liquid is 2BV;

[0055] The roll-type nanofiltration membrane separates salt, the pressure is controlled at 1.3Mpa, the water production rate is controlled at 94%, and the sulfate radical rejection rate is 98.89%. The purity of the obtained sodium chloride crystalline salt is 98.43%, reaching the standard of industrial qualifi...

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Abstract

The invention belongs to the technical field of environmental protection, and provides a treatment method for crystallization and salt separation of thermoelectric reverse osmosis concentrated water.According to the process, thermoelectric reverse osmosis concentrated water are sequentially treated through active carbon and ion exchange resin to reduce COD and hardness, salt separation is then carried out by using a nano-filtration membrane, and the obtained nano-filtration concentrated water and nano-filtration produced water are respectively crystallized to obtain corresponding products. Byadopting the process, the influence of COD (Chemical Oxygen Demand) and hardness in the RO concentrated water on the crystallization products is effectively reduced, and the situation that resourcesare wasted due to the fact that mixed salt is easy to crystallize and cannot be utilized when the ratio of sodium chloride to sodium sulfate in the RO concentrated water is about 1 is effectively avoided in a nano-filtration mode. According to the method, the generation of hazardous wastes is reduced, the recycling of resources is promoted, the salt separation efficiency is high, and the energy consumption is lower than that of membrane-method salt separation and direct cold-method quality-divided crystallization.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of sewage treatment, and specifically provides a treatment method for thermoelectric reverse osmosis concentrated water crystallization and salt separation. Background technique [0002] Industrial wastewater mainly contains a large amount of dissolved total solids mainly composed of inorganic salts, and has the characteristics of high hardness, high COD content and poor biochemical properties. In order to save costs and achieve resource reuse, relevant enterprises now hope to recover the inorganic salts in wastewater to obtain industrial-grade products with value. In recent years, RO (reverse osmosis) has been widely used in wastewater treatment as a conventional and efficient desalination technology. RO will produce some concentrated water in the process of treating wastewater, and the COD, hardness and salt content in the concentrated water are relatively high. , Direct disch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C01D3/06C01D3/14C01D5/16C01D5/18C02F101/10C02F101/12
CPCC02F9/00C01D3/06C01D3/14C01D5/16C01D5/18C01D5/00C02F1/283C02F1/42C02F1/442C02F1/22C02F1/04C02F2101/12C02F2101/101
Inventor 赵迪吴文雷崔丽云李敏高浩量王俊男
Owner CHAMBROAD CHEM IND RES INST CO LTD
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