A system for treating organochlorine wastewater by coupling technology of electric dechlorination and chemical dechlorination

Abstract

The invention discloses a system for treating organic chlorine wastewater by coupling technology of electric dechlorination and chemical dechlorination, which comprises an electric dechlorination unit, a primary ultrafiltration unit, an iron-carbon dechlorination unit, a secondary ultrafiltration unit, an oxidation unit, and a flocculation unit arranged in sequence. Unit, adsorption unit, incineration unit, the adsorption unit effluent is discharged, the primary ultrafiltration and the secondary ultrafiltration permeate are transported to the crystallization unit, and an ultrasonic generator is set in the cathode chamber of the electric dechlorination unit and filled with Cu / Fe / Ag composite metal powder and activated carbon, the Cu:Fe:Ag mass ratio is 1-5:25-50:0.5-1, and an integrally formed Pd / Fe / C filler is set in the iron-carbon dechlorination unit, so The above-mentioned Pd / Fe / C mass ratio is 2-5:30-50:20-30, through the combination of electric dechlorination and chemical dechlorination technology to better treat organic chlorine wastewater, and through the setting of ultrafiltration unit and crystallization unit Realize the recycling of waste water.

Description

technical field [0001] The invention belongs to the field of waste water treatment, and in particular relates to a system for treating organochlorine waste water with the coupling technology of electric dechlorination and chemical dechlorination. Background technique [0002] Organic chlorides are important pollutants in water. At present, the common organic chloride pollutants in water bodies include organochlorine pesticides of chlorinated aromatic hydrocarbons, such as DDT, chlorobenzene, etc., chemical products such as polychlorinated biphenyls, and chemical products formed by burning chemicals. Dioxins; chlorinated aliphatic hydrocarbons, such as carbon tetrachloride, vinyl chloride, etc. [0003] Most organic chloride pollutants are artificially synthesized compounds with relatively stable chemical properties and high octanol / water partition coefficient. They are easy to accumulate in organisms, soil and organic matter in sediments. The presence of chlorine atoms on th...

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Problems solved by technology

CN109851113A discloses a method and system for degrading high-concentration organic chlorine wastewater. The method uses low-temperature evaporation and ultraviolet light catalysis as the main body, firstly distills low-boiling point chlorine-containing organics, separates them from waste water, and then degrades high-boiling point chlorine-containing organic matter. Chlorine-containing organic matter is subjected to photocatalytic treatment to reduce residual chlorine into chloride ions to achieve the purpose of removing organic chlorine in wastewater. However, this method uses ultraviolet catalysis and does not separately treat the chlorinated groups of organic chlorine. This leads to low organic chlorine dechlorination efficiency; patent CN2015201982549 discloses a methane chloride organic chlorine wastewater treatment system, which uses hydrogen peroxide catalytic oxidation-flocculation method to treat methane chloride organic chlorine wastewater, which not only makes the organic chlorine sewage reach the standard discharge, but also Hydrogen peroxide does not produce secondary pollution after use

However, organochlorine is only settled by flocculation, and dechlorination of organochlorine has not been achieved.

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