Degradation of azo dye acid orange 7 in a Membrane bioreactor by pellets and attached growth of Coriolus versicolour

作者：Hai Faisal I^*; Yamamoto Kazuo; Nakajima Fumiyuki; Fukushi Kensuke; Nghiem Long D; Price William E; Jin Bo

来源：Bioresource Technology, 2013, 141: 29-34.

DOI：10.1016/j.biortech.2013.02.020

• Azo dye
• Morphology
• Membrane bioreactor (MBR)
• Non-sterile
• White-rot fungi

The aim of this study was to systematically compare the degradation of azo dye acid orange 7 by spongy pellets and attached biofilm of Coriolus versicolour (NBRC 9791) in a membrane bioreactor (MBR) under non-sterile conditions. Mild stirring (35 rpm) resulted in spherical (phi = 0.5 cm), spongy pellets and concomitantly triggered high enzymatic activity of the fungus, allowing for excellent decolouration (>99%) of a synthetic wastewater containing the dye. However, bacterial contamination eventually damaged the fungus pellets, leading to decreased decolouration efficiency. Promotion of attached growth on a plastic support along with formation of spherical spongy pellets allowed maintenance of high enzymatic activity and decolouration/degradation for an extended period. Hydraulic retention time (HRT) could influence the level of enzymatic activity and decolouration; however, even at the shortest HRT (1 day) examined, the MBR could accomplish >95% decolouration.

• 出版日期2013-8