Microelectrolytic treatment process of printing and dyeing waste water

Abstract

The invention belongs to the field of treatment of chemical waste water and particularly relates to a microelectrolytic treatment process of printing and dyeing waste water. The microelectrolytic treatment process has the characteristics that an air flotation pool is arranged at the most front end to remove suspended solids in the water, simultaneously carrying out iron-carbon microelectrolytic reaction according to the characteristics of the waste water, carrying out ring opening and chain breaking on nonbiodegradable pollutants in the waste water so as to improve the biodegradability of the waste water, effectively enhance the pretreatment effect and create beneficial conditions for following biochemical treatment; due to addition of a submersible stirring machine in an anaerobic pool, the hydrolytic acidification degree of the waste water is improved; a flat-plate membrane is arranged in an aerobic pool, and by utilization of a membrane bioreactor (MBR) technology, separation of HRT (Hydraulic Retention Time) from SRT (Sludge Retention Time) is realized, sludge load is increased, the biological treatment is stabilized, the SS (Suspended Solid) concentration in the discharged water is effectively reduced and the sewage treatment load is increased, so that the effect of biological treatment of the process is effectively stabilized and the quality of the discharged water is stabilized; and with the purpose of preventing the condition of unstable system operation, active carbon is utilized for adsorption and filtration to guarantee the standard of the discharged water and the deep treatment effect.

Description

technical field [0001] The invention belongs to the field of chemical wastewater treatment, and in particular relates to a micro-electrolysis treatment process for printing and dyeing wastewater. Background technique [0002] The textile printing and dyeing industry is one of the industrial sectors in my country that consumes a large amount of water and discharges a large amount of wastewater. According to incomplete statistics, domestic printing and dyeing enterprises discharge 3 to 4 million tons of wastewater every day. The discharged wastewater contains the entrainment of the fiber raw material itself, as well as the slurry, postal agents, dyes and chemical additives used in the processing process. It has the characteristics of high biochemical oxygen demand, high chroma, and high pH value, and is difficult to treat. of industrial wastewater. [0003] For textile enterprises that use cotton production scraps mainly denim to reprocess fiber production, the production pr...

AI Technical Summary

Problems solved by technology

At present, the printing and dyeing wastewater treatment process of such textile enterprises generally adopts "coagulation pretreatment + A 2 / O biological treatment + coagulation treatment + air flotation + filtration" combination process, but after this process, the effluent COD Cr The mass concentration is 140~290mg / L, and the chroma is 125~200 times, which cannot meet the requirements of the latest "Water Pollutant Discharge Standards for Textile Dyeing and Finishing Industry"

Images