Zero-discharge treatment process and device for high-salt-content industrial wastewater

Abstract

The invention provides a zero-discharge treatment process for high-salt-content industrial wastewater. The process includes the steps that S1, in pretreatment, through adding chemicals, ions and impurities in the wastewater are settled; S2, in ceramic membrane filtering, a ceramic membrane is utilized for separating the settled ions and impurities in the wastewater to serve as pretreatment of a forward osmosis technology; S3, in forward osmosis concentration, based on a forward osmosis principle, the wastewater is concentrated efficiently, and purified water is separated from the wastewater to be recycled; S4, in multi-effect evaporation crystallization, a multi-effect evaporation crystallization technology is utilized for performing advanced treatment on forward osmosis concentrate to achieve zero discharge of the wastewater. The invention further provides a zero-discharge treatment device for the high-salt-content industrial wastewater. The zero-discharge treatment process and device have the advantages that the multiple technologies of the ceramic membrane, forward osmosis and evaporation crystallization are coupled, the high-quality purified water can be recycled from the industrial wastewater, zero discharge of the wastewater can be achieved, energy consumption is low, the production cost is low, and the process is advanced.

Description

technical field [0001] The invention relates to waste water treatment, in particular to a zero-discharge treatment process and equipment for high-salt industrial waste water. Background technique [0002] With the rapid development of my country's industry, the types and quantities of industrial wastewater have increased rapidly. The salt content of various industries is complex, and the harm to the environment is far higher than that of urban domestic sewage, threatening human health and safety. For the protection of the environment, the treatment of industrial wastewater is more important than the treatment of urban sewage, and the discharge of industrial wastewater is a major headache for industrial enterprises. With the country's increasingly stringent requirements for industrial wastewater discharge, the zero-discharge technology of industrial wastewater has begun to be applied. [0003] For the treatment of "zero discharge" of industrial wastewater, the traditional te...

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Problems solved by technology

[0003] For the treatment of "zero discharge" of industrial wastewater, the traditional technology of evaporation and crystallization is widely used in China. The investment in industrial wastewater treatment is large, the operating cost is high, and the treatment process is not perfect, which limits the promotion and application of zero discharge technology, and it is difficult to truly realize it. Wastewater "zero discharge"

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