Journal
JOURNAL OF ENVIRONMENTAL SCIENCES
Volume 22, Issue 4, Pages 621-626Publisher
SCIENCE PRESS
DOI: 10.1016/S1001-0742(09)60154-6
Keywords
biodegradation; the mutant strain CTM 2; phenol; m-cresol; kinetic
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Funding
- Youth Academic Cadreman Project of Heilongjiang Provincial Education Department [1152G068]
- Natural Science Foundation of Heilongjiang Provincial [B200819]
- China Postdoctor [20070410268]
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The phenol and m-cresol biodegradations were studied using the mutant strain CTM 2 obtained by the He-Ne laser irradiation on wild-type Candida tropicalis. The results showed that C. tropicalis exhibited the increased capacity of phenolic compounds degradation after laser irradiation. It could degrade 2600 mg/L phenol and 300 mg/L m-cresol by 5% inoculum concentration, respectively. In the dual-substrate biodegradation system, 0-500 mg/L phenol could accelerate m-cresol biodegradation, and 300 mg/L m-cresol could be completely utilized within 46 hr at the presence of 350 mg/L phenol. Besides, the maximum biodegradation of m-cresol could reach 350 mg/L with 80 mg/L phenol within 61 hr. Obviously, phenol, as a growth substrate, could promote CTM 2 to degrade m-cresol, and was always preferentially utilized as carbon source. Comparatively, low-concentration m-cresol could result in a great inhibition on phenol degradation. In addition, the kinetic behaviors of cell growth and substrate biodegradation were described by kinetic model proposed in our laboratory.
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