Whole membrane treatment method of electroplating chromeplating waste water

Abstract

A whole membrane treatment method of electroplating chrome plating waste water comprises the following treatment steps of: 1) rinsing: rinsing electroplating chromeplated parts with clear water in a rinsing tank after being electroplated through a chromeplating electrophoresis liquid tank to obtain rinsed liquid; (2) sand filtration: treating the rinsed liquid in the rinsing tank by a sand filtration tank to remove suspension, colloid, flocculate, mud sand, rust, and the like to obtain sand-filtered liquid; (3) hollow fiber ultrafiltration membrane treatment; (4) reverse osmosis treatment: performing reverse osmosis concentration treatment of the clear liquid by a reverse osmosis device; (5) cyclic operation of the above steps. The method has the advantages that the problem of secondary pollution caused by traditional chemical precipitation methods is solved; the problem of membrane oxidation and degradation due to hexavalent chromium ions is solved; the method meets the new discharge national standard; the whole process flow operation is simple and convenient; waste water in the whole process is in a recycle state, and is not discharged to the outside at all; and the whole process reaches the standard of zero discharge.

Description

Technical field: [0001] The invention relates to the field of wastewater treatment, in particular to a method for treating electroplating and chrome-plating wastewater with a full-membrane method. Background technique: [0002] At present, in the field of industrial wastewater treatment, especially in the treatment of electroplating wastewater, the main method is still the chemical precipitation method, and the treated water must be treated with wastewater to meet the new national discharge standard. Although electroplating wastewater such as nickel and copper has begun to be treated by membrane method, due to the chemical factors of the strong oxidative property of chromium, the treatment of chromium plating wastewater by membrane method has been limited, and it is difficult to solve the secondary problems caused by chemical precipitation treatment. Pollution and other problems, as well as the problem of oxidative degradation of the membrane by hexavalent chromium ions, can...

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Problems solved by technology

[0002] At present, in the field of industrial wastewater treatment, especially in the treatment of electroplating wastewater, the main method is still the chemical precipitation method, and the treated water must be treated with wastewater to meet the new national discharge standard. Although electroplating wastewater such as nickel and copper has begun to be treated by membrane method, due to the chemical factors of the strong oxidative property of chromium, the treatment of chromium plating wastewater by membrane method has been limited, and it is difficult to solve the secondary problems caused by chemical precipitation treatment. Pollution and other problems, as well as the problem of oxidative degradation of the membrane by hexavalent chromium ions, cannot meet the ideal zero emission standard, and have a certain negative impact on the environment

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