Coal chemical industry concentrated brine zero discharge technique and special equipment thereof

Abstract

The invention relates to a coal chemical industry concentrated brine zero discharge technique and special equipment thereof. A method of two-stage clarification softening, ultrafiltration, ion exchange softening, two-stage reverse osmosis, purification and impurity removal and evaporative crystallization is utilized to treat the coal chemical industry concentrated brine. The water recovery rate is up to 98% above, thereby saving the water resources; and the sludge generated by the system enters a sludge treatment system to be subjected to dehydration treatment, thereby reducing the environmental pollution caused by discharge of the concentrated liquor, and further implementing coal chemical industry concentrated brine zero discharge.

Description

technical field [0001] The invention belongs to the technical field of coal chemical industry wastewater treatment and environmental protection, and specifically relates to a coal chemical industry concentrated brine zero discharge process and special equipment. Background technique [0002] Modern coal chemical industry is a new type of industry that takes coal as raw material, converts coal into gas, liquid and solid products through chemical processing, and further processes it into a series of chemical products. It mainly includes coal gasification, coal liquefaction, tar chemistry, and calcium carbide acetylene chemistry. In recent years, the coal chemical industry has developed rapidly, but because the coal chemical industry needs to consume a lot of water, the resulting water resource reuse and environmental Protection issues are becoming more and more prominent, especially in areas with a lot of drought and little rain. Therefore, the environmental protection proble...

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Problems solved by technology

[0009] The purpose of the present invention is to provide a zero-discharge process and special equipment for the coal chemical concentrated brine in view of the technical defect that the above-mentioned existing coal chemical concentrated brine advanced treatment method cannot make the coal chemical concentrated brine achieve zero discharge. Concentrated brine is treated with two-stage clarification and softening, ultrafiltration, ion exchange softening, two-stage reverse osmosis, purification and impurity removal, and evaporation and crystallization, so that the concentrated brine can finally achieve more than 98% reuse, reducing the environment caused by the discharge of concentrated liquid Pollution, thereby achieving the goal of zero discharge of concentrated brine in the coal chemical industry

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