Fabric dyeing wastewater treatment method

Abstract

The invention relates to the field of textile printing and dyeing and in particular relates to a fabric dyeing wastewater treatment method. The treatment method comprises the following steps: collecting gray fabric wash liquid wastewater and wastewater produced in washing and pickling steps after rinsing, classifying and recovering dye residue liquid according to different dyes, collecting cleaning wastewater after dyeing, and treating the collected wastewater by adopting processes such as homogeneous adjustment, screen or filtering net filtration, air flotation, oxidization, biochemical treatment and advanced treatment performed in sequence. According to the technical scheme in the invention, the dyes can be recovered to the greatest degree, the wastewater treatment burden is reduced, recovery benefits are increased, the treatment cost is reduced, and good economic benefits and social benefits are achieved.

Description

technical field [0001] The invention relates to a treatment method for fabric dyeing wastewater, which belongs to the treatment of wastewater in the field of textile printing and dyeing, in particular to the treatment of dye wastewater. Background technique [0002] The printing and dyeing industry is the key to increasing the added value of products in the textile industry chain, and it is also an industry with high energy and water consumption and large wastewater discharge. According to statistics, the discharge of wastewater from the textile industry ranks third among all industries, accounting for 10.60% of the national industrial wastewater discharge, while the sewage discharged from the printing and dyeing industry accounts for 80% of the entire textile industry. The national printing and dyeing wastewater discharges 300-400 per day. 10,000 tons, which is extremely harmful to the environment. Printing and dyeing wastewater is classified according to the process steps...

AI Technical Summary

Problems solved by technology

[0005] The resulting problem is that there are various types of dyes in dyeing wastewater, and their chemical properties are different, which increases the difficulty of treatment or classification and recovery; some dye types require a large amount of inorganic salts to promote the dyeing of dyes, while some dyes do not require inorganic salts or It can be dyed with low salt. The mixed dyeing wastewater will cause the failure of the dye and the high conductivity of the wastewater, which will increase the difficulty of treatment. If desalination treatment is not carried out, it will affect the reuse of water. Some studies have shown that the water used for printing and dyeing If the conductivity exceeds 3000μS / cm, salt will easily cause spots on the fabric and affect the quality of the product

[0006] Common printing and dyeing wastewater treatment methods in the prior art include coagulation method, adsorption method, oxidation method (including but not limited to chemical oxidation, photocatalytic oxidation, electrochemical oxidation, supercritical oxidation, ultrasonic oxidation and other oxidation methods), biological method, membrane Separation and other process methods or their combinations, but the above methods are all for the treatment of comprehensive printing and dyeing wastewater and dyeing wastewater. The treatment process is poorly targeted, the treatment efficiency is not high, and the resource recovery rate is also low, resulting in a lot of waste of resources.

Such as the patent application whose publication number is CN101293726A, it is for the treatment of printing and dyeing wastewater. The wastewater is first treated by anaerobic, anoxic and aerobic reactors, and then treated by biological aerated filter, ultrafiltration reactor and reverse osmosis reactor. , part of the water quality is reused in each process link of the printing and dyeing process. It only proposes the reuse of the treated water, and does not classify the wastewater. The treatment process is more complicated and the effect is not good.

CN101503268A discloses a zero-discharge EBM method for printing and dyeing wastewater, including the steps of sequentially performing primary electro-oxidation, biochemical treatment, secondary electro-oxidation, inclined plate clarification, sand filter treatment and electro-demineralization membrane system treatment. It also combines a variety of treatment processes, and there is no targeted treatment for dyeing wastewater

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