Environment-friendly method for treating printing and dyeing wastewater

Abstract

The invention relates to an environment-friendly method for treating printing and dyeing wastewater. The environment-friendly method specifically comprises the following steps: utilizing a grid to remove larger suspended matters and floating matters in the printing and dyeing wastewater and sending into a first treatment tower to oxidize and degrade hazardous substance; then adding a coagulant aidinto the oxidized printing and dyeing wastewater to perform secondary biochemical treatment on the printing and dyeing wastewater, conveying the oxidized and degraded wastewater to an adjusting tank,adjusting water volume and balancing water quality, then utilizing a pump to lift water to a hydrolytic acidification pool, making hydrolytic acidified effluent automatically flow into a contact oxidation tank, removing most organisms and chromaticity through the microbial action in the contact oxidization tank, sending the hydrolytic acidified effluent into a sedimentation basin, putting elasticthree-dimensional filler into the tank, utilizing the contact oxidization tank as a main technology for treating the printing and the dyeing wastewater, putting the elastic three-dimensional filler and semi-flexible combined filler into the tank and utilizing micropore aeration at the bottom of the tank. To the printing and dyeing wastewater containing sulfur dyestuff and naphthol dyestuff, the effluent still has deeper color and needs to be further decolorized after the printing and dyeing wastewater is coagulated and sedimented.

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