Highly efficient oxidation-BAF process based on printing and dyeing pysicochemical sludge for advanced treatment of printing and dyeing biochemical tailwater
In view of the poor biodegradability of printing and dyeing wastewater and the difficulty of reaching the standard of biochemical tail water,the highly efficient oxidation-biological aerated filter(BAF)process was constructed for advanced treatment of tail water in this study.The persulfate advanced oxidation method was used to improve the biodegradability of the tail water,and then the BAF biological treatment was used to achieve the standard reached discharge of printing and dyeing biochemical tail water.In addition,in order to solve the problem of difficult disposal of printing and dyeing sludge,sludge-based biochar catalysts and sludge ceramsite materials were developed and used in the combined process.The results showed that under the optimal parameters:pysicochemical sludge-based catalyst dosage of 2 g·L-1,potassium peroxymonosulfate(PMS)dosage of 4 mmol·L-1,and pH 7,UV254 and the COD removal rates of biochemical tail water were 68.1％and 66.0％,respectively,and the BOD5/COD value increased to 0.35,which effectively improved the biodegradability of tail water.Compared with the commercial ceramsite filler,the self-made sludge ceramsite filler had a larger specific surface area and more microbial attachment.When the oxidized tail water was fed into the Z-BAF reactor filled with sludge ceramsite,the effluent indicators can stably meet the Discharge Standard of Water Pollutants for Textile Dyeing and Finishing Industry(GB 4287-2012)under the optimal operating conditions:hydraulic retention time of 10 h and gas-water ratio of 7∶1.The combined process utilizes the advantages of physicochemical sludge resources to treat waste with waste,and provides a green,economical and environmentally friendly process scheme for printing and dyeing wastewater treatment.
printing and dyeing biochemical tailwaterhighly efficient oxidation-BAF processdyeing and printing sludgesludge-based bio-carbonsludge ceramic grains
国家科技期刊平台
NSTL
万方数据
