Treatment technology for electroplating wastewater

Abstract

The invention discloses a treatment technology for electroplating wastewater. The technology comprises the following steps of 1, collecting chromium-contained electroplating wastewater, cyanide-contaminated electroplating wastewater, a pretreatment solution, chemical nickel wastewater, pyrophosphate copper wastewater and ordinary electroplating wastewater; 2, using chromic acid in the chromium-contained electroplating wastewater for oxidizing complexes in the pretreatment solution, the chemical nickel wastewater and pyrophosphate copper wastewater; 3, using cyanide in the cyanide-contaminated electroplating wastewater for reducing remaining chromic acid of the chromium-contained electroplating wastewater to obtain sediments; 4, adjusting an ORP value and adding alkaline substances to generate sediments; 5, filtering the sediments obtained in the fourth step to obtain a supernate; 6, conducting microwave processing on the supernate, and then obtaining sediments; 7, filtering the sediments obtained in the sixth step, and completing treatment of the comprehensive electroplating wastewater. According to the technology, the treatment technology is optimized, the purification efficiency is improved, the input cost is lowered, resource waste is saved, and the effects of waste control by waste and resource reutilization are achieved.

Description

technical field [0001] The invention relates to a wastewater purification process, in particular to a treatment process for electroplating wastewater. Background technique [0002] The electroplating industry is an indispensable link in my country's national economy, involving various fields such as national defense, industry, and life. The phenomenon of large demand has also caused the excessive development of the electroplating industry, and a large number of electroplating factories have been built. Waste water and waste liquid discharged from electroplating factories (or workshops), such as rinsing water for plating parts, waste tank liquid, cooling water for equipment, and water for flushing the ground, etc. Due to many types of plating, cumbersome process, complex water quality, and difficult control of components, electroplating wastewater mainly contains heavy metal ions such as chromium, cadmium, nickel, copper, zinc, gold, silver and cyanide, etc. These electroplat...

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Problems solved by technology

[0004] 1. The process is complex. Not only does it need to classify and separate the wastewater during pretreatment, but also has higher requirements for process parameters and process environment in the subsequent treatment process;

[0005] 2. The purification efficiency is not high, the purification effect is not good, and it is difficult to meet the national electroplating wastewater discharge standard. If it is not handled properly, the heavy metals in the sludge will easily cause secondary pollution to the environment.

[0006] 3. The input cost is extremely high, more treatment steps and treatment devices are required, and a lot of chemicals are needed in the treatment process. The heavy metals in the wastewater are easy to waste. The treatment process so far cannot realize the transformation of waste into treasure. The effect of resource regeneration and efficient use;

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