Aerobic biodegradation of odorous dimethyl disulfide in aqueous medium by isolated Bacillus cereus GIGAN2 and identification of transformation intermediates

A novel, flagellated, rod-shape, Gram-positive facultative aerobe, was isolated and identified as Bacillus cereus GIGAN2. It can effectively remove model odorous organics dimethyl disulfide (DMDS) in aqueous solution under aerobic conditions. Initial concentration, pH value and temperature played im...

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Bibliographic Details
Published in:Bioresource technology 2015-01, Vol.175, p.563-568
Main Authors: Liang, Zhishu, An, Taicheng, Li, Guiying, Zhang, Zhengyong
Format: Article
Language:English
Subjects:
Aerobiosis
Bacillus cereus
Bacillus cereus - genetics
Bacillus cereus - isolation & purification
Bacillus cereus - metabolism
Biodegradation
Biodegradation, Environmental
Biotechnology - methods
Carbon
China
Dimethyl
Disulfides
Disulfides - metabolism
Gas Chromatography-Mass Spectrometry
Half-Life
Hydrogen-Ion Concentration
Kinetics
Odorants
Sewage - microbiology
Spectrometry
Temperature
Transformations
Water - chemistry
Water - metabolism
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Summary:A novel, flagellated, rod-shape, Gram-positive facultative aerobe, was isolated and identified as Bacillus cereus GIGAN2. It can effectively remove model odorous organics dimethyl disulfide (DMDS) in aqueous solution under aerobic conditions. Initial concentration, pH value and temperature played important role in DMDS biodegradation, and up to 100% of 10mgL(-1) of DMDS could be removed within 96h under the optimum conditions (30°C, pH 7.0 and 200rpm) with a maximum biodegradation rate constant of 0.0330h(-1) and minimum half-life of 21.0h, respectively. Three main intermediates were identified using gas chromatography-mass spectrometry during this biodegradation process. Further, a reaction scheme is also proposed to explain the possible DMDS biodegradation mechanism by GIGAN2 based on the above-identified intermediates. Overall, this is the first report to demonstrate a newly isolated strain using high concentrated DMDS as the sole carbon and energy source with high efficiency.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2014.11.002