Treatment method and apparatus for printing and dyeing desizing waste water

Abstract

The present invention discloses a treatment method and an apparatus for printing and dyeing desizing waste water. According to the method, the pH value of pre-treated desizing waste water is adjusted; a starch decomposition material is utilized to hydrolyze starch mud in the desizing waste water to reduce viscidity and ion concentration of the desizing waste water; and finally a thin film separation process is applied on the desizing waste water after starch mud hydrolysis, such that solid-liquid separation of the desizing waste water is achieved so as to obtain the recovered water, therefore, scale clogging and filter cake generation of the filter film can be effectively delayed when the subsequent solid-liquid separation is performed, such that a service life of the film is relatively prolonged.

Description

technical field [0001] The invention relates to a method and a device for treating waste water, in particular to a method and a device for treating printing and dyeing desizing waste water which can reduce the treatment cost and effectively solve the problem of environmental pollution. Background technique [0002] The textile printing and dyeing industry accounts for a considerable proportion of industrial wastewater discharge, especially the desizing wastewater generated in the weaving process is the main source of pollution. The generation of desizing wastewater is based on the gray cloth woven after warp yarn sizing. The slurry needs to be washed away with water, and the wastewater produced is called desizing wastewater, and if the desizing wastewater is discharged without proper treatment, the domestic water quality will be seriously polluted. [0003] Desizing wastewater contains a large amount of PVA (polyvinyl alcohol), CMC (carboxymethyl cellulose) and adhesives. Be...

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Problems solved by technology

[0006] Although the use of aeration disturbance and rotating disk membrane group has a certain effect on reducing membrane clogging and fouling, but in the face of desizing wastewater with high concentration and high viscosity, there are still blind spots in the membrane treatment effect, especially for desizing wastewater. Pulp wastewater contains a large amount of starch slurry. When these high-concentration starch slurry enters the sludge tank, it is often directly adsorbed on the membrane surface or in the pores of the membrane to form a filter cake with extremely high viscosity. Although the membrane with anti-fouling properties can be used materials to improve the service life of the membrane, but it cannot avoid the rapid attenuation of the flux of the membrane, and the membrane cannot effectively deal with the slurry accumulated on the surface during cleaning, so it has become the most difficult problem in the treatment of desizing wastewater

[0007] Therefore, how to achieve a balance between recycling costs and environmental protection, there is still no efficient and cost-effective treatment method, which makes waste water treatment companies more and more expensive to improve environmental protection. Therefore, how to actively improve production quality and pollution prevention and control technology to balance economy and environmental protection, reduce production costs, and improve industrial competitiveness have become the urgent goals of related industries.

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