Electroplating wastewater recycling treatment method

Abstract

An electroplating wastewater recycling treatment method provided by the invention comprises the following steps: demulsification treatment, namely, adding a demulsifier into collected electroplating wastewater in each workshop to remove emulsified oil and floating oil in the electroplating wastewater; precipitation and filtration treatment, namely, adjusting the pH value of the demulsified electroplating wastewater to an alkaline condition; primary membrane concentration treatment, namely, enabling the pretreated wastewater to enter primary reverse osmosis membrane treatment equipment to remove soluble pollutants in the wastewater so as to obtain primary produced water and a primary concentrated solution, the primary produced water entering a produced water mixing tank, and the primary concentrated solution entering a membrane concentrated solution storage tank; and recycling treatment, namely, enabling the primary concentrated solution to enter an evaporative crystallization system tobe subjected to evaporative crystallization treatment to obtain crystalline salt and condensate, mixing the condensate with the primary produced water, carrying out secondary membrane concentration treatment to obtain secondary produced water and a secondary concentrated solution, refluxing the secondary concentrated solution to the primary membrane concentration treatment, and recycling the 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 for electroplating wastewater to solve the problem of evaporating a large amount of concentrated liquid when treating electroplating wastewater in the related art, and the evaporated condensate cannot be reused, resulting in waste of water resources and excessive evaporation costs. high problem

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