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Decolorization of Reactive Black‐5 by Shewanella sp. in the Presence of Metal Ions and Salts
Author(s) -
Imran Muhammad,
Arshad Muhammad,
Khalid Azeem,
Hussain Sabir,
Mumtaz Muhammad Waseem,
Crowley David E.
Publication year - 2015
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143014x14062131178114
Subject(s) - chemistry , metal , nuclear chemistry , metal ions in aqueous solution , strain (injury) , bacterial growth , bacteria , effluent , environmental engineering , organic chemistry , biology , genetics , anatomy , engineering
In this study, effect of various metal ions and salts on biodecolorization of Reactive black‐5, azoreductase activity, and growth of Shewanella sp. strain IFN4 was evaluated. Among the tested metals, Cr +2 , Pb 2+ , Ni 2+ , Fe 2+ , and Mn +2 did not inhibit the biodecolorization of reactive black‐5, azoreductase activity and bacterial growth. Three metals (Cu 2+ , Zn +2 , and Co 2+ ) delayed the decolorization process without completely inhibiting the reaction and also suppressed the bacterial growth. However, no dye decolorization was observed in the presence of Cd +2 (10 mg L −1 ). Furthermore, bacterium decolorized the dye at high concentration (15 mg L −1 ) of mixed metal ions. Strain IFN4 was also able to decolorize the dye at 50 g NaCl L −1 and 60 g Na 2 SO 4 L −1 . NaCl was found to be more inhibitory to bacterial growth than Na 2 SO 4 and the reverse was observed for azoreductase activity. These findings suggest that strain IFN4 could be used in designing a bioreactor for the treatment of textile effluent.