Journal
BIORESOURCE TECHNOLOGY
Volume 151, Issue -, Pages 63-68Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2013.09.131
Keywords
Shewanella; Redox mediator; Humic acids; Decolorization; Saline
Funding
- National Natural Science Foundation of China [51008044]
- Fundamental Research Funds for the Central Universities [DUT13LK22]
- China Postdoctoral Science Foundation [201104596]
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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 mu mol mg cell(-1) h(-1)): 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. (C) 2013 Elsevier Ltd. All rights reserved.
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