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«“√ “√ √“™∫— ≥±‘µ¬ ∂“π ªï ∑’Ë Ú˜ ©∫— ∫∑’Ë Û °.§.-°.¬. ÚıÙı ≥— ∞æ— π∏ÿ å »ÿ ¿°“, ·≈–§≥– ˆ˘˘ matic pollutants in co-cultures of anaerobic and aerobic bacterial consor- tia. Antonie van Leeuwenhoek 1995; 67: 47-77. Ù. OûNeill C, Lopez A, Esteves S, Hawkes FR, Hawkes DL, Wilcox S. Azo-dye degradation in an anaerobic-aerobic treatment system operating on simu- lated textile effluent. Appl Microbiol Biotechnol 2000; 53: 249-54. Abstract Bacterial Decolorization of Reactive Dye in an Anaerobic-Aerobic Treatment System Nattapun Supaka 1 , Kanchana Junthongjin 1 , Somsak Damronglerd 2 1 Department of Microbiology, Faculty of Science, Chulalongkorn University, Bangkok 10330 2 Fellow, the Academy of Science, the Royal Institute, Thailand Bacteria were isolated from the wastewater treatment systems of a textile industry. It was pos- sible to break the chromophoric azo bonds in reactive-orange 16, reactive-black 5, reactive-violet 5 and absorbed chromophoric anthraquinone in reactive-blue 19 in synthetic wastewater which con- tained starch and acetic acid. Analysis of the effluent of each experiment by HPLC showed that azo dyes were decomposed to colorless intermediate substances in the anaerobic stage; all intermediate substances and COD were diminished in the aerobic stage, whereas anthraquinone dye was ab- sorbed in bacterial cells. The most efficient conditions for this process were temperatures in the range of 37˚C to 50˚C and pH 7 to 9. Key words : bacterial decolorization, anaerobic-aerobic treatment system Ú. Seshadri S, Bishop PL. Anaerobic/ aerobic treatment of selected azo dyes in wastewater. Waste Management 1994; 14(2): 127-37. Û. Field JA, Stems AJM, Kato M, Schraa G. Enhanced biodegradation of aro-