Electroplating wastewater recycling treatment method

Abstract

An electroplating wastewater recycling treatment method provided by the invention comprises the following steps: pH value regulation, namely, adding a pH regulator into a pH regulating tank to regulate the pH value of electroplating wastewater; reduction treatment, namely, adding a reducing agent after pH value regulation of the electroplating wastewater; precipitation and filtration treatment, namely, precipitating and filtering the electroplating wastewater subjected to the reduction reaction to remove first sludge in the electroplating wastewater, the first sludge being a mixture of suspended solids and precipitates; primary membrane concentration treatment, namely, feeding the electroplating wastewater subjected to precipitation and filtration treatment into primary reverse osmosis membrane treatment equipment to obtain primary produced water and a primary concentrated solution, the primary produced water entering a produced water mixing tank, and the primary concentrated solutionentering a membrane concentrated solution storage tank; and recycling treatment, namely, carrying out solid-liquid separation on the primary concentrated solution to obtain second sludge, crystallinesalt and condensate, mixing the condensate with the primary produced water, and carrying out secondary membrane concentration treatment to obtain a secondary concentrated solution and secondary produced water.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method for resourceful treatment of electroplating wastewater. Background technique [0002] Due to different production processes and finished products in the electroplating industry, the composition of the wastewater is very complex and contains a variety of heavy metals, especially the production wastewater in the electroplating park. According to different production processes and water quality characteristics, it can be divided into electroplating wastewater and electroplating waste liquid. Among them, electroplating wastewater often includes electroplating nickel wastewater, chemical nickel wastewater, chromium-containing wastewater, copper-containing cyanide-containing wastewater, zinc-containing wastewater, acid copper wastewater, coke copper wastewater, comprehensive wastewater, anodic oxidation wastewater and pretreatment wastewater, etc.; electroplating w...

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a recycling treatment method of electroplating wastewater to solve the problem that when electroplating wastewater is treated in the related art, the heavy metals in the wastewater finally exist in the evaporation residue, which cannot be recycled by the enterprise and must be handed over to an organization with hazardous waste treatment qualifications Disposal, high disposal costs, resulting in the inability to effectively achieve zero discharge of electroplating wastewater

Images