Electroplating wastewater zero discharging treatment process

Abstract

The invention discloses an electroplating wastewater zero discharging treatment process. The process comprises the following processing steps of firstly, converging and infusing electroplating wastewater into a sedimentation basin for sedimentation; then, pumping clear liquid of the wastewater into a filter made of carbon nano-materials through a raw water booster pump, and conducting filtering treatment; subsequently, making wastewater obtained after treatment enter a cationic resin exchanger, and then pumping the wastewater into a first safety filter through a first booster pump; then making the wastewater enter an ultrafiltration system; making water obtained after treatment enter a second safety filter through an ultrafltration water tank; subsequently, making the water enter a first-level RO concentration system, a second-level RO concentration system, a third-level RO concentration system and a fourth-level RO concentration system in sequence for dehydration and concentration; finally, making water obtained after concentration enter an evaporator for evaporation, conducting recovery, and obtaining salt. By means of the concentrated water concentration treatment process, the salt content is high, the water content is low, cost for recycling salt is lowered, meanwhile, the amount of recycled water is increased, and fresh water consumption every day is saved.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a zero-discharge treatment 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 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 of them are highly toxic substances that are...

AI Technical Summary

Problems solved by technology

However, the discharge of reverse osmosis concentrated water after the above-mentioned equipment and process treatment cannot achieve the goal of zero discharge of wastewater. The reverse osmosis concentrated water contains heavy metal ions and a large amount of recyclable salts, and the amount of recycled water is limited and the amount of concentrated water is large.