Integrative electroplating waste treatment process

Abstract

The invention discloses a process for treating comprehensive electroplating wastewater, which solves the technical problems existing in the prior process for treating the comprehensive electroplating wastewater. The process comprises the following steps: (1) establishing wastewater disposal basins for the electroplating wastewater by classification, and automatically adding waste acid and waste alkali into the basins; (2) reducing hexavalent chrome for pretreatment; (3) carrying out secondary oxidation decyanation and reduction treatment on wastewater containing cyanogen; (4) mixing pretreated wastewater containing chromium and wastewater subjected to the secondary oxidation decyanation treatment without cyanogen with the comprehensive electroplating wastewater containing copper, nickel and zinc, adjusting the mixed wastewater to neutrality, and adding an NTC coagulating agent into the mixed wastewater; (5) after coagulation, carrying out solid-liquid separation on the wastewater in a high-speed sedimentation tank; and (6) filtering the wastewater which is subjected to the solid-liquid separation in an intermediate water tank, and recycling the qualified wastewater or discharging the qualified wastewater in accordance to standard. The process has the advantages that the problem that different metal ions require respective treatment or multiple circulating treatments because of different concentrations can be solved, the problem of independently setting air flotation to remove oil can be solved, the problem of recycling the waste acid and the waste alkali can be solved; and investment, operating cost and floor area are saved.

Description

technical field [0001] The invention belongs to an electroplating wastewater treatment process, in particular to a comprehensive electroplating wastewater treatment process. Background technique [0002] Electroplating is one of the three major polluting industries in the world today. Electroplating wastewater, especially comprehensive electroplating wastewater, has the characteristics of many types of pollutants, complex components, high toxicity and serious hazards. The main pollutants are various heavy metal ions, cyanide, waste acid and waste alkali, etc. Traditional electroplating wastewater treatment processes such as chemical precipitation, electrolysis, extraction, adsorption, membrane separation, and biological methods all have high investment, high operating costs, complicated management, poor results, and secondary pollution. They are only suitable for Limitations such as specific electroplating wastewater. [0003] The Chinese invention patent published in 2008...

AI Technical Summary

Problems solved by technology

[0004] The invention discloses a comprehensive electroplating wastewater treatment process, which solves the problem that different heavy metal ions have different solubility products and needs to be treated separately or multiple cycles, solves the problem of separately setting up air flotation to remove oil, and solves the problem of recycling waste acid and waste alkali. Utilize the problem to solve the problem of high investment and high operating cost of comprehensive electroplating wastewater treatment

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