Environmental protection method for treating printing and dyeing wastewater

Abstract

The invention relates to an environmental protection method for treating printing and dyeing wastewater. The method specially includes the following steps that after large suspended substances and floating substances are removed through gratings, the printing and dyeing wastewater enters a first treating column to conduct oxydative degradation on hazardous substances; a coagulant aid is added intothe printing and dyeing wastewater after oxidation treatment to conduct secondary biochemical treatment on the printing and dyeing wastewater, the wastewater after oxydative degradation is conveyed to a regulating pool, regulating of water volume and balance of water quality are conducted in the regulating pool, then the wastewater is lifted to a hydrolysis acidification pool by using a pump, yielding water of hydrolytic acidification automatically flows into a contact oxidation pool, after most of organic matter and chroma are removed in the contact oxidation pool through microbial action, and water flows into a sedimentation pool where elastic space packing is placed, wherein the contact oxidation pool is used in the principal process of printing and dyeing wastewater treatment, the elastic space packing and semi-flexible combined packing are placed in the contact oxidation pool, and the bottom of the contact oxidation pool is aired by adopting micro holes; for the printing and dyeing wastewater, after coagulation sedimentation treatment is conducted on the printing and dyeing wastewater containing sulfur dyes and naphthol dyes, if yielding water still has dark color, further decoloration has to be conducted.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and specifically relates to an environmental protection method for treating printing and dyeing wastewater. Background technique [0002] Industrial wastewater includes production wastewater and production sewage, which refers to wastewater and waste liquid produced in the process of industrial production, which contains industrial production materials, intermediate products, by-products and pollutants produced in the production process lost with water. With the rapid development of industry, the types and quantities of wastewater have increased rapidly, and the pollution of water bodies has become increasingly widespread and serious, threatening human health and safety. Therefore, for the protection of the environment, the treatment of industrial wastewater is more important than the treatment of urban sewage. [0003] With the development of the printing and dyeing industry, a...

AI Technical Summary

Problems solved by technology

[0003] With the development of the printing and dyeing industry, a large number of chemical fiber products have appeared, and the application of new chemical pulp, dyeing materials and finishing agents has changed the composition of printing and dyeing wastewater, making the treatment more difficult. The simple aerobic biological treatment method The COD and chroma of the effluent are difficult to meet the standards and seriously pollute the environment. It is a combination of biological and chemical methods of hydrolysis acidification and contact oxidation. The coagulation process can solve this problem