Staged treatment and resource recycling system for organic chlorine wastewater

Abstract

The invention discloses a staged treatment and resource recycling system for organic chlorine wastewater. The staged treatment and resource recycling system comprises an ultrasonic dechlorination unit, a primary ultrafiltration unit, an iron-carbon dechlorination unit, a secondary ultrafiltration unit, an oxidation unit, a flocculation unit, an adsorption unit and an incineration unit which are sequentially arranged, wherein the adsorption unit is used for discharging water. A concentrated solution obtained through primary ultrafiltration is conveyed to the iron-carbon dechlorination unit, a concentrated solution obtained through secondary ultrafiltration is conveyed to the oxidation unit, permeate obtained through primary ultrafiltration and secondary ultrafiltration is conveyed to the crystallization unit, an ultrasonic generator is arranged in the ultrasonic dechlorination unit, and Cu / Fe / Ag composite metal powder is packed in the ultrasonic dechlorination unit. The mass ratio of Cu to Fe to Ag is (1-5):(25-50):(0.5-1), the ultrasonic frequency is 22-28 kHz, and the sound intensity is 35-45 W / cm<2>; and the oxidation unit is a Fenton unit, an integrally formed Pd / Fe / C filler is arranged in the iron-carbon dechlorination unit, and the mass ratio of Pd to Fe to C is (2-5):(30-50):(20-30). The organic chlorine wastewater is subjected to graded dechlorination and two times of ultrafiltration treatment, so that organic chlorine in the wastewater is efficiently removed, and primary and secondary ultrafiltration permeate liquid is fed into a crystallization unit to obtain recovered salt.

Description

technical field

[0001] The invention belongs to the field of waste water treatment, and in particular relates to a system for graded treatment and resource recovery of organic chlorine waste water. Background technique

[0002] Organochlorine compounds are an important chemical raw material, which are widely used in chemical industry, medicine, pesticide, tanning and other industries. As a result, a large amount of organochlorine wastewater is discharged, and many surface water and groundwater are polluted by organochlorine. Organochlorine compounds are difficult to biodegrade and are very toxic to microorganisms and human health. At present, there are biological methods, physicochemical methods, electrochemical methods, redox incineration methods, etc. to treat organic chlorine wastewater. It is an important way to reduce the toxicity of organochlorine and improve its biochemical or incineration performance. Therefore, how to efficiently reduce the dechlorination of organo...

Images