Technique and system for zero discharging treatment of electroplating effluent

Abstract

The invention discloses a technique and a system for zero discharging treatment of electroplating effluent. The system comprises a material classifying pre-treatment system, a biochemical comprehensive treatment system, a membrane method system, a membrane concentrated liquor vaporization system and a sludge classifying treatment system which are connected with each other in turn, wherein the sludge classifying treatment system is connected with the material classifying pre-treatment system and the biochemical comprehensive treatment system; the raw wastewater enters into the material classifying pre-treatment system; water generated by the membrane method system is recycled; the condensed liquid from the membrane concentrated liquor vaporization system is re-injected into the material classifying pre-treatment system. According to the technique provided by the invention, the wastewater is firstly treated in classifying form, so that the heavy pollution ions, such as, chromium, cyanogen, nickel, and the like, and the oily matters in the wastewater are effectively removed, and then the biochemical comprehensive treatment system is used for further treating, and lastly, the RO+SuperRo two-level combination mode is utilized to achieve the gross recovery at 94%, and meanwhile, the liquid amount for evaporation treatment is less than 6% of the gross wastewater quantity, the cost of the evaporation treatment is saved, the sludge is recycled, the waste of resources is avoided and the sludge treating cost is saved.

Description

technical field [0001] The invention relates to the field of advanced treatment of electroplating wastewater, in particular to a zero-discharge treatment process and system for electroplating wastewater. Background technique [0002] The main sources of electroplating wastewater are pretreatment wastewater, coating rinsing water, waste electroplating solution and other wastewater. Due to the complex composition of electroplating wastewater, large differences in water quality, high content of heavy metals and toxicity, the composition is not easy to control. It contains heavy metal ions such as chromium, cadmium, nickel, copper, zinc, gold, silver and cyanide, etc., some of which are carcinogenic and carcinogenic. Teratogenic and mutagenic highly toxic substances should meet the requirements of energy saving, emission reduction and circular economy concepts. While carrying out advanced treatment on them, it is necessary to achieve micro-emissions as much as possible, or even ...

AI Technical Summary

Problems solved by technology

Due to the limitations of the anti-pollution performance and operating pressure of the reverse osmosis membrane, after relatively harsh pretreatment, it can only achieve a recovery rate of 50%-70%, and the remaining 30%-50% of the membrane concentrate if it is to achieve zero High evaporation costs are required, and the continuous high evaporation load also increases the actual processing load of the entire process to a certain extent

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