Wastewater zero discharge treatment system for scr catalyst regeneration wastewater

Abstract

A zero-discharge wastewater treatment system for Selective Catalytic Reduction (SCR) catalyst regeneration wastewater, the SCR catalyst regeneration wastewater containing solid suspensions, and the zero-discharge wastewater treatment system comprising: a pre-treatment system A, a membrane concentration system B, and an evaporation system C; the pre-treatment system A is configured to remove the solid suspensions from the SCR catalyst regeneration wastewater; the membrane concentration system B is configured to concentrate the pre-treated regeneration wastewater so as to obtain fresh water and concentrated water; and the evaporation system C is configured to evaporate the concentrated water. The core of the foregoing process route is zero discharge, and the process sufficiently separates liquid and solid suspensions in the wastewater by means of multiple cycles in the pre-treatment stage, and then concentrates and evaporates to crystallize the separated liquid by means of a two-staged reverse osmosis device membrane to finally obtain fresh water, a mud cake and a crystalline salt. By using the foregoing processing system, more than 90% of good-quality fresh water may be recovered, and the amount of solid waste discharge is less than 30% of the amount of solid waste discharge in traditional chemical processing solutions.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a wastewater zero-discharge treatment system for SCR catalyst regeneration wastewater. Background technique [0002] The denitrification process of coal-fired power plants mostly uses the SCR catalytic oxidation method, which requires the use of denitrification catalysts. After long-term use, the denitrification catalyst will be damaged, poisoned, deactivated and other problems. The poisoned and deactivated catalyst can be regenerated after being cleaned and loaded with active substances to realize recycling. During the process of regenerating the SCR catalyst, waste water will be generated, which contains heavy metals such as chromium, vanadium, manganese, copper, arsenic, etc., and the content of suspended solids and COD also exceeds the discharge standard, so it cannot be discharged directly to the outside, and waste water treatment is required. [0003] The tra...

AI Technical Summary

Problems solved by technology

However, a large amount of sludge produced during the sedimentation process of wastewater treated by traditional chemical precipitation needs to be sent out as hazardous waste for reprocessing, which has high treatment costs, and there are still residual heavy metals in the treated water, which cannot meet the discharge requirements.

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