Environmentally friendly technology for treating printing and dyeing wastewater through contact oxidation process

Abstract

The invention relates to an environmentally friendly technology for treating printing and dyeing wastewater through a contact oxidation process. The technology concretely includes the following steps: printing and dyeing wastewater goes through a grid to remove large suspensions and floating substances, obtained wastewater enters an equalizing tank and undergoes water flow adjustment and quality balancing, obtained wastewater is lifted to a hydrolysis acidification tank through a pump, and the tank is only controlled in an acidic fermentation stage in order to improve the biodegradability of wastewater; hydrolysis acidification effluent self-flows to a contact oxidation tank and is acted by microbes in the contact oxidation tank to remove most organic matters and chroma, obtained water enters a sedimentation tank, and sludge in the sedimentation tank returns to the hydrolysis acidification tank; and an elastic stereo filler is arranged in the tank to control the dissolved oxygen (DO) in a range of 0-0.5mg/L. Compared with traditional technologies, the technology provided by the invention has the advantages of better treatment effect, low energy consumption, less mud production, and direct dehydration of residual sludge. A coagulation sedimentation tank and a decolorization oxidation tank are arranged behind the sedimentation tank to realize three stage treatment in order to obtain water with good quality, and parts of the outlet water can be reused in production. The combination technology improves the treatment effect of the printing and dyeing wastewater, and is practical.

Description

technical field [0001] The invention relates to an environmental protection technology for treating printing and dyeing wastewater by a contact oxidation process, and belongs to the technical field of printing and dyeing wastewater treatment. Background technique [0002] 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. The combination of biological and chemical methods of hydrolysis acidification-contact oxidation-coagulation process can solve this problem. Contents of the invention [0003] The purpose of the present invention is to provide an environmental protection technology for treating printing and dyeing w...

AI Technical Summary

Problems solved by technology

[0002] 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 effluent COD and chroma are difficult to reach the standard, and the combination of biological method and chemical method of hydrolytic acidification-contact oxidation-coagulation process can solve this problem