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Biodegradation of 2-methylisoborneol by bacteria enriched from biological activated carbon |
Rongfang YUAN1, Beihai ZHOU1(), Chunhong SHI1, Liying YU1, Chunlei ZHANG2, Junnong GU2 |
1. Department of Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China; 2. Water Quality Monitoring Center, Beijing Waterworks Group, Beijing 100085, China |
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Abstract One of the most common taste and odour compounds (TOCs) in drinking water is 2-methylisoborneol (2-MIB) which cannot be readily removed by conventional water treatments. Four bacterial strains for degrading 2-MIB were isolated from the surface of a biological activated carbon filter, and were characterized as Micrococcus spp., Flavobacterium spp., Brevibacterium spp. and Pseudomonas spp. based on 16S rRNA analysis. The removal efficiencies of 2-MIB with initial concentrations of 515 ng·L-1 were 98.4%, 96.3%, 95.0%, and 92.8% for Micrococcus spp., Flavobacterium spp., Brevibacterium spp. and Pseudomonas spp., respectively. These removal efficiencies were slightly higher than those with initial concentration at 4.2 mg·L-1 (86.1%, 84.4%, 86.7% and 86.0%, respectively). The kinetic model showed that biodegradation of 2-MIB at an initial dose of 4.2 mg·L-1 was a pseudo-first-order reaction, with rate constants of 0.287, 0.277, 0.281, and 0.294 d-1, respectively. These degraders decomposed 2-MIB to form 2-methylenebornane and 2-methyl-2-bornane as the products.
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Keywords
2-methylisoborneol (2-MIB)
biodegradation
2-methylenebornane
2-methyl-2-bornane
pseudo-first-order reaction
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Corresponding Author(s):
ZHOU Beihai,Email:zhoubeihai@sina.com
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Issue Date: 01 October 2012
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