Reclamation of Printing and Dyeing Wastewater Using a Pilot-scale A/O/BAF/Sub-Filter Technology
Textile industry is characterized by large water consumption and a great deal of wastewater is discharged into water environment causing pollution. The effluent from the dyeing and finishing processes is characterized by strong color, high pH, high temperature, high chemical oxygen demand (COD), low biochemical oxygen demand (BOD) and highly toxic as they contain a large number of metal complex dyes. Many processes have been studied to treat textile wastewaters. However, their application in an industrial plant becomes difficult due to operational problems and costs. In this paper, a pilot-scale (300m3/d) study was used for advanced treatment of textile printing and dyeing wastewater by hydrolysis acidification—biological contact oxidation—biological aerated filter—sub-filter technology (Patent, CN1308024A; A/O/BAF/Sub-Filter technology). The wastewater from a printing and dyeing factory was firstly hydrolyzed under anoxic condition and then was treated under aerobic condition. Finally, the wastewater was filtered by sub-filter system and pumped into workshop for printing and dyeing process. The investigation indicated, although raw wastewater quality was unsteady, the treated effluent concentration of CODcr, color, turbidity were less than 60mg/L, 10 times and 2NTU, respectively and the removal efficiencies of COD, color, SS were in the range of 90％–92％, 92％–93％ and 91％–94％, respectively. The treated effluent quality satisfied the requirement of water quality for printing and dyeing process. The most attracting part of the work was its extremely low color, low turbidity, low concentration of Fe and Mn, which was always demanded in textile sector for an improved finish and better quality dyeing. The dyeing effect shows that cloth had perfect exhaustion and fixation, respectively.The pilot-scale test result also showed that this process had many advantages such as stable performance, simple operation, easy management, and that this work could be reference for industrial scale application for textile wastewater advanced treatment and reclamation using A/O/BAF/Sub-filter technology.
textile effluent wastewater reuse COD sub-filter technology color removal
LU Xujie CHEN Jihua MI Zhongxiang XI Danli
College of Environmental Science and Engineering, Donghua University, Shanghai 200051, China;College College of Environmental Science and Engineering, Donghua University, Shanghai 200051, China College of Life Science, Shaoxing University, Shaoxing 312000, Zhejiang, China
国际会议
2007环境科学与技术国际会议(The 2007 International Symposium on Environmental Science and Technology)
北京
英文
2007-11-13（万方平台首次上网日期，不代表论文的发表时间）