UV photolysis for enhanced phenol biodegradation in the presence of 2,4,6-trichlorophenol (TCP) |
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| Authors: | Jiaxiu Song Wenbing Wang Rongjie Li Jun Zhu Yongming Zhang Rui Liu Bruce E. Rittmann |
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| Affiliation: | 1.Department of Environmental Science and Engineering, College of Life and Environmental Science,Shanghai Normal University,Shanghai,People’s Republic of China;2.Zhejiang Provincial Key Laboratory of Water Science and Technology, Department of Environmental Technology and Ecology,Yangtze Delta Region Institute of Tsinghua University,Jiaxing,People’s Republic of China;3.Swette Center for Environmental Biotechnology, Biodesign Institute,Arizona State University,Tempe,USA |
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| Abstract: | A bacterial strain isolated from activated sludge and identified as Bacillus amyloliquefaciens could biodegrade phenol, but 2,4,6-trichlorophenol (TCP) inhibited phenol biodegradation and biomass growth. UV photolysis converted TCP into dichlorocatechol, monochlorophenol, and dichlorophenol, and this relieved inhibition by TCP. Phenol-removal and biomass-growth rates were significantly accelerated after UV photolysis: the monod maximum specific growth rate (μ max) increased by 9 % after TCP photolysis, and the half-maximum-rate concentration (K S) decreased by 36 %. Thus, the major benefit of UV photolysis in this case was to transform TCP into a set of much-less-inhibitory products. |
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