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High-salt wastewater reuse and zero-emission method

A high-salt wastewater and zero-discharge technology, applied in chemical instruments and methods, multi-stage water treatment, water/sewage treatment, etc., can solve problems such as low crystallization yield and quality, blockage of cooling crystallization tubes, waste of fresh water, etc. , to achieve the effects of small footprint, reduced operating costs, and low operating costs

Inactive Publication Date: 2019-01-11
河北云瑞化工设备有限公司
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Problems solved by technology

The former not only cannot really reduce the total discharge of pollutants, but also causes a waste of fresh water, especially the discharge of salty wastewater, which will inevitably lead to the mineralization of fresh water resources and soil alkalization. Needs to be processed, wastes energy
At present, with the enhancement of environmental protection, it has become a trend to use evaporative crystallization + cooling crystallization to separate sodium chloride and potassium chloride and sell them as industrial grade salt, but this method consumes a lot of energy, and cooling crystallization is prone to tube blockage, Problems of crystallization yield and low quality

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  • High-salt wastewater reuse and zero-emission method

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Embodiment Construction

[0025] Below in conjunction with accompanying drawing, the present invention will be further described by embodiment:

[0026] A high-salt wastewater reuse and zero discharge process, comprising the following steps:

[0027] First send the high-salt wastewater into the high-density sedimentation tank, and then add calcium hydroxide, sodium carbonate, PAC, and PAM to the high-density sedimentation tank in turn for softening treatment, remove most of the hardness, SS and some organic matter in the wastewater, and then enter the ozone catalytic oxidation The pool is subjected to catalytic treatment, and the effluent enters the activated carbon biofilter to remove most of the pollutants such as COD and ammonia nitrogen. After that, large particles of impurities are intercepted by the multimedia filter of the filter material, which is a mixture of quartz sand and anthracite, and then absorbed by the activated carbon filter. COD, and then enter the ultrafiltration device, add sodium...

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Abstract

The invention relates to a high-salt wastewater reuse and zero-emission method. The method comprises a pretreatment process, a quantitative reduction process, a high-temperature thermal evaporation process, and a low-temperature flash evaporation process. The method adopts a simple and reasonable combination process, and reduces the energy consumption of a whole system, so that all water resourcesand solid resources are reused.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a method for reuse and zero discharge of high-salt wastewater. Background technique [0002] In recent years, the high-salt wastewater discharged from coking, steel mills, power plants, metallurgy and other industries has continued to increase. A large amount of sodium chloride and potassium chloride wastewater is produced every day in industrial production, and contains a large amount of organic matter. The sewage is biochemically treated to reduce organic matter. The remaining wastewater mainly contains sodium chloride, potassium chloride and trace amounts of other salts. Usually referred to as high-salt wastewater. For high-salt wastewater, due to the lack of technical and economic feasibility and reliability, most of them adopt the method of dilution and discharge or evaporation and crystallization to produce mixed salt. The former not only cannot r...

Claims

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Application Information

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IPC IPC(8): C02F9/14
CPCC02F1/04C02F1/06C02F1/441C02F1/444C02F1/5245C02F1/725C02F1/78C02F3/00C02F9/00C02F2301/08Y02A20/131
Inventor 翟民赵敏刚张伟周艳丽吴玉蕾李彦菊
Owner 河北云瑞化工设备有限公司