Method and system for recycling residual liquid in dye vat

Abstract

The invention relates to the field of sewage treatment and recycling and discloses a method for recycling residual liquid in a dye vat. The method comprises the following steps: S11, collecting the residual liquid; S12, filtering the residual liquid to remove impurities; S13, introducing the residual liquid into a special membrane separation system to obtain produced water and concentrated water;S14, recycling the produced water and collecting and discharging the concentrated water. The residual liquid in the dye vat is decolorized by the special membrane separation system, salt in the residual liquid is retained in the produced water, the salt in the residual liquid is recycled while dyeing sewage is purified and treated, and accordingly, treatment burden of a sewage plant is reduced, energy is saved, the environment is protected, and the production cost is reduced.

Description

technical field [0001] The invention relates to a resource utilization method and system for dyeing vat residual liquid, belonging to the field of sewage treatment and reuse. Background technique [0002] Reactive dyes have the advantages of complete chromatogram, bright color, simple application process, strong applicability, and relatively cheap price. They have become the most important type of dyes in cellulose dyes. However, the dye uptake rate and color fixation rate of reactive dyes are low (60%-70%). In order to improve its dye uptake rate and color fixation effect, in the dyeing process of cellulose, a large amount of inorganic salt (chlorine) is generally added to the dye vat. Sodium chloride or sodium sulfate) as a dyeing aid, the dosage is as high as 30g / L-150g / L, the reason is that the electrolyte will reduce the electron cloud density of the carbon atoms connected to chlorine in the active fuel, and promote the bonding reaction between reactive dyes and cellulo...

AI Technical Summary

Problems solved by technology

However, since the waste liquid contains a large amount of salt and refractory dye residue, it is directly discharged into the sewage station, which will cause a lot of waste of useful materials on the one hand, and will greatly increase the processing load of the sewage treatment system on the other hand, affecting the normal operation of the biochemical system. It also increases the difficulty of the back-end deep processing system

Images