Method for treating recycled printing and dyeing sewage

Abstract

The invention discloses a method for treating recycled printing and dyeing sewage, which is applicable to the treatment and reutilization of sewage of printing and dyeing of fabrics such as wool fabrics, silk fabrics, cotton, linen, chemical fiber fabrics and the like. The method aims to overcome the disadvantages of sewage treatment of the prior printing and dyeing mills and ensure that the sewage reaches the national discharge standard of water pollutants for dyeing and finishing. The method adopts treatment technology of physicochemical-biochemical, precipitation and filtration, which comprises the following process flow: the sewage, a collecting basin, an anaerobic tank, an aerobic tan, a dosing tank, a sedimentation tank, a filter tank, and the discharge or recycling of water which achieves the standard. In addition, complex enzyme is also added; the complex enzyme has a catalytic function, and can strengthen the activation of microorganisms; the method has good treatment effect on the sewage; and the adding of the complex enzyme can strengthen the activity of the microorganisms, improve the effect of sewage treatment, can also save electric energy, reduce the loss of medicaments, and save the cost. The sewage is recycled after the filtration through a microstrainer, which saves the resource, reduces the cost once again, and truly achieves the aims of energy conservation and discharge reduction.

Description

technical field [0001] The invention relates to a method for treating sewage, which belongs to the field of sewage treatment, and is suitable for the treatment and reuse of sewage in the printing and dyeing of fabrics such as wool spinning, silk weaving, and cotton and linen chemical fibers. Background technique [0002] Protecting the environment and saving energy are important tasks in modern society, and treating industrial sewage is a major project in environmental protection. According to the source and composition of sewage, the methods of sewage treatment are different: there are physical, biochemical and microbial methods. Printing and dyeing sewage mainly includes direct dyes, vat dyes, sulfur dyes and reactive dyes. During the dyeing process, additives, sizing, acid and alkali, fiber impurities, inorganic salts, etc. are required. The content of organic matter is high, the chroma is large, and the pH value changes. Big. The printing and dyeing sewage is usually t...

AI Technical Summary

Problems solved by technology

These methods have disadvantages: (1) sewage treatment occupies a large area and increases cost

(2) Large investment

(3) The treatment effect is not ideal

Physicochemical treatment has high operating costs, difficult sludge treatment, economically unreasonable, unstable operation, and its treatment effect will fluctuate greatly with the change of dyes