Treatment process and device of electroplating wastewater

Abstract

The invention relates to the technical field of sewage treatment equipment, in particular to a treatment process and device of electroplating wastewater. The treatment device comprises a stock solution tank, a feeding pump, a first plate heat exchanger, a second plate heat exchanger, a falling film evaporator, a falling film separator, a forced circulation heat exchanger, a crystallization segregator, a discharging pump, a thickener, a centrifuge and a mother liquor tank which are successively communicated, wherein the falling film separator and the top end of the crystallization segregator are communicated with the falling film evaporator through a centrifugal compressor; the falling film evaporator and the forced circulation heat exchanger are further communicated with a distilled water tank, and the distilled water tank is communicated with the first plate heat exchanger through a distilled water pump; the falling film separator, the falling film evaporator and the crystallization separator are all communicated with the input end of a forced circulation pump, and the output end of the forced circulation pump is communicated with the forced circulation heat exchanger. Therefore, the treatment process and device disclosed by the invention are low in production cost, and high in treatment effect.

Description

technical field [0001] The invention relates to the technical field of sewage treatment devices, in particular to an electroplating wastewater treatment process and device. Background technique [0002] The water quality of electroplating wastewater is complex, and its composition is difficult to control. It contains heavy metal ions such as chromium, cadmium, nickel, copper, zinc, gold, silver, and highly toxic substances such as cyanide, as well as some organic matter and a large amount of salt; the current precipitation method in electroplating wastewater The investment in wastewater is low, but the effect is unstable. The effect of ion exchange method is stable, the process is simple, and heavy metals in wastewater can be recovered, but the investment is slightly high, and the salt in the water cannot be removed in the later stage of electroplating wastewater, and the salt content in wastewater is high. Contents of the invention [0003] The object of the present inven...

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Problems solved by technology

[0002] The water quality of electroplating wastewater is complex, and its composition is difficult to control. It contains heavy metal ions such as chromium, cadmium, nickel, copper, zinc, gold, silver, and highly toxic substances such as cyanide, as well as some organic matter and a large amount of salt; the current precipitation method in electroplating wastewater The investment in waste water is low, but the effect is unstable. The effect of ion exchange method is stable, the process is simple, and heavy metals in waste water can be recovered, but the investment is slightly high, and the salt in the water cannot be removed in the later stage of electroplating waste water, and the salt content in waste water is high.

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