Zero-discharge system for quality-divided treatment of high-salinity wastewater of power plant

Abstract

The invention discloses a zero-emission system for quality-divided treatment of high-salinity wastewater of a power plant, and belongs to the field of water treatment of thermal power plants. The system comprises a pretreatment system, a salt separation and purification system, a regeneration system and a production system. The salt-containing wastewater sequentially passes through the pretreatment system, the salt separation and purification system, the regeneration system and the production system; the regeneration system comprises bipolar membrane electrodialysis, an acidic water storage tank, an alkaline water storage tank, an electrolytic chlorine production device and a sodium hypochlorite storage tank. According to the present invention, the whole zero emission is provided, the external raw material addition is reduced, and the treatment cost is reduced.

Description

technical field [0001] The invention relates to the field of water treatment in thermal power plants, in particular to a zero-discharge system for separate treatment of high-salt wastewater in power plants. Background technique [0002] In order to meet the country's environmental protection requirements for thermal power plants, domestic thermal power plants have carried out "zero discharge" engineering practices for the treatment of terminal wastewater (mainly high-salt wastewater mainly desulfurization wastewater). There are both successful cases and failures. [0003] The overall route of zero-discharge treatment of desulfurization wastewater can basically be summarized as a combination of three parts: "pretreatment → concentration reduction → solid-liquid separation". There are three specific forms, the first: pretreatment → membrane concentration → evaporation crystallization process; the second: pretreatment → membrane concentration → flue evaporation process; the thi...

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Problems solved by technology

The above three methods even have certain defects; especially the two post-processing methods, which only turn the wastewater into solid waste and dilute it into fly ash, there are certain policy risks. In addition, the soluble salt in the wastewater evaporates and crystallizes After entering the boiler flue, there are uncertainties about the impact on the subsequent treatment of the flue gas, whether it will cause corrosion of the flue gas or how the evaporated industrial salt will be marketed and sold.

Whether the industrial salt produced by the first process through the evaporation crystallization system can be sold and enter the circulation link is not clear about the national policy, and it also increases the difficulty of power plant disposal

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