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Haoyu Zhao,Yucong Geng,Jieyu Fan,Ke Tao,Taiping Hou 한국생물공학회 2013 Biotechnology and Bioprocess Engineering Vol.18 No.2
A formaldehyde-degrading bacterium strain,FD3, was isolated from contaminated soil and identified as Paracoccus sp. based on partial 16S rRNA gene sequence analysis. In batch culture, the bacterium metabolized 5,000and 8,000 mg/L formaldehyde completely within 16 and 18 h, respectively, at 30oC (pH 7.0) with agitation at 150 rpm. The degradation kinetics was found to follow a first-order model at all initial formaldehyde concentrations with regression values greater than 0.99. Formaldehyde degradation rates increased from 532.37 to 2283.04 mg/L/h as the initial concentration of formaldehyde was increased from 1,000 to 8,000 mg/L. The growth of strain FD3 on formaldehyde as a sole carbon and energy source was well described by the Luong model with a maximal specific growth rate of 0.1754/h, a half-saturation constant of 309.02 mg/L, and a maximum substrate concentration of 3875.53 mg/L. Due to its high tolerance and degradation capacity to formaldehyde, Paracoccus sp., FD3 is considered an excellent candidate for use in degrading formaldehyde in wastewaters.
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