Treatment process of electroplating wastewater

Abstract

The invention provides a treatment process of electroplating wastewater. The treatment process comprises the steps of (1) setting equipment; (2) connecting equipment; (3) enabling the wastewater to enter a homogenizing tank and then be pumped into an electric flocculation device, and enabling produced water to enter a flocculation water production tank; (4) filtering electric flocculation produced water by a precision filter I; (5) separating produced water in the pretreatment produced water tank by a primary nanofiltration unit, enabling fresh water to enter a primary nanofiltration fresh water tank, and enabling concentrated water to enter a nanofiltration concentrated water tank; (6) conveying the nanofiltration concentrated water to a wet oxidation unit, adding alkali and PAM into the produced water subjected to wet oxidation for precipitation, and then enabling the produced water to enter a primary nanofiltration fresh water tank; (7) separating the primary nanofiltration fresh water by using a reverse osmosis unit, enabling concentrated water to enter a reverse osmosis concentrated water tank, and enabling the fresh water to enter a product water tank; and (8) conveying the reverse osmosis concentrated water to an MVR unit for crystallization, and evaporating sodium chloride salt. The treatment process of the electroplating wastewater is low in investment, reliable in operation, low in energy consumption and capable of really realizing zero discharge of electroplating wastewater.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a treatment process for electroplating wastewater. Background technique [0002] The electroplating industry is an indispensable link in the national economy, involving various fields such as national defense, industry, and life. From the broad categories, it can be divided into metal electroplating and plastic electroplating for parts, so as to achieve the effects of anti-corrosion, beauty and prolonging the life of the workpiece. However, electroplating will produce a large amount of wastewater containing heavy metals, mainly containing zinc, nickel, iron, copper, copper, etc., as well as very toxic and harmful substances such as cyanide. [0003] At present, the main treatment process of electroplating wastewater is chemical agent precipitation method + follow-up biochemical method. The main problem of this process is that the biochemical process works better for...

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Problems solved by technology

Because the process is not perfect, firstly, the amount of evaporated crystallization water is large, the investment is large, and the purity of the product salt is low; the crystallized salt is mostly

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