Effects of redox mediators on azo dye decolorization by Shewanella algae under saline conditions

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• 作者：Xianming Meng ; Guangfei Liu ; Jiti Zhou ; Q. Shiang Fu
• 关键词：Shewanella ; Redox mediator ; Humic acids ; Decolorization ; Saline
• 刊名：Bioresource Technology
• 出版年：January, 2014
• 年：2014
• 卷：151
• 期：Complete
• 页码：63-68
• 全文大小：453 K

文摘

Azo dye decolorization by Shewanella algae (SAL) in the presence of high concentrations of NaCl and different quinones or humic acids was investigated to reveal the effects of redox mediator under saline conditions. Growth of SAL and the other two marine Shewanella strains coupled to anthraquinone-2,6-disulfonate (AQDS) reduction was observed in a wide range of NaCl concentrations (0-7%). AQDS showed the best enhancing effects, whereas some other quinones demonstrated poorer stimulating or even inhibiting effects on acid red 27 (AR27) decolorization. Different humic acids could also enhance the decolorization. The correlation between specific AQDS-mediated reduction rate and initial AR27 concentration could be described with Michaelis-Menten kinetics (K_m = 0.2 mM and V_max = 9.3 渭mol mg cell^鈭? h^鈭?). AQDS reduction by SAL was determined to be the rate-limiting step of mediated reduction. Mediated decolorization products of AR27 were determined to be less phytotoxic aromatic amines.