Wastewater zero discharging treatment system for regenerated wastewater of SCR catalyst

Abstract

The invention provides a wastewater zero discharging treatment system for regenerated wastewater of an SCR catalyst. The wastewater zero discharging treatment system comprises a pre-treatment system A, a membrane concentration system B and an evaporation system C, wherein the regenerated wastewater is circulated repeatedly in the pre-treatment system A, suspended matter in the water is removed, then the wastewater passes through the membrane concentration system B for concentration treatment, fresh water obtained through concentration treatment is collected, and concentrated water obtained through concentration treatment flows into the evaporation system C for evaporation treatment. A process route with zero discharging as a core is adopted, liquids and suspended solids in the wastewater are sufficiently separated through repeated circulation in the pre-treatment stage, then the liquids are re-treated, the fresh water, mud cakes and crystalline salts are obtained through final treatment after membrane concentration treatment by two stages of reverse osmosis devices and evaporative crystallization treatment, the fresh water is collected and recycled, and the mud cakes and the crystalline salts are delivered out for treatment; 90% or more fresh water with better quality can be recovered by the treatment system, and the solid waste discharge is 30% or lower of that of a treatment scheme adopting traditional chemical agents.

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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