Electroplating wastewater zero-liquid discharge system and process

Abstract

The invention discloses an electroplating wastewater zero-liquid discharge system and process, and belongs to the technical field of electroplating wastewater treatment. The electroplating wastewater zero-liquid discharge system is characterized in that a last cleaning tank in the moving direction of a plated part is communicated with a first collecting water tank, and the water outlet end of the first collecting water tank is communicated with the water inlet end of an ion exchange system; the water producing end of the ion exchange system is communicated with the middle water tank, the water outlet end of the plate and frame filter and the first cleaning tank in the moving direction of the plated part are both communicated with the second collecting water tank, the water outlet end of the second collecting water tank is communicated with the heavy metal settling pond, and the supernatant water outlet end of the heavy metal settling pond is communicated with the sand filter; the concentrated liquid end of the evaporator recycles concentrated liquid to the plating tank through a pipeline, the fresh water end of the DTRO and the condensate water end of the evaporator are both communicated with the middle water tank, and the water outlet end of the middle water tank supplies water to at least two cleaning tanks. According to the electroplating wastewater zero-liquid discharge system and the electroplating wastewater zero-liquid discharge process, zero-liquid discharge is realized, and the heavy metal removal efficiency is high.

Description

technical field [0001] The invention belongs to the technical field of electroplating wastewater treatment, and in particular relates to a zero-liquid discharge system and process for electroplating wastewater. Background technique [0002] The sources of electroplating wastewater are generally: (1) plating cleaning water; (2) waste electroplating solution; (3) other wastewater, including washing the floor of the workshop, scrubbing plate washing water, condensed water from ventilation equipment, and leakage from plating tanks. Or various tank liquids and drainages of "running, popping, dripping, and leaking" caused by improper operation and management; (4) Equipment cooling water, which has not been polluted except for the temperature rise during use. The water quality and quantity of electroplating wastewater are related to the process conditions of electroplating production, production load, operation management and water use methods and other factors. The water quality ...

AI Technical Summary

Problems solved by technology

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 cyanide, and some are highly toxic substances that are carcinogenic, teratogenic, and mutagenic.

[0003] The existing electroplating wastewater treatment still has liquid discharge, and the discharged liquid still has the risk of pollution; and due to the incomplete mixing of heavy metal trapping agents and wastewater, the removal of heavy metals is incomplete, and the removal efficiency of heavy metals is low

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