期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 229, 期 -, 页码 159-169出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2012.05.090
关键词
Biosorption; Biodegradation; Polycyclic aromatic hydrocarbon; Soil; Phanerochaete chrysosporium
资金
- National Natural Science Foundation of China [41071210, 20890111]
- National High-Tech Research and Development Program of China [2012AA06A203]
- Zhejiang Provincial Natural Science Foundation of China [R5100105]
- Foundation for the Author of National Excellent Doctoral Dissertation of China [200765]
To assess the bioaccessible pool of mycelia-bound polycyclic aromatic hydrocarbons (PAHs) and to quantify its biodegradation kinetics in soil, a soil-slurry system containing mycelial pellets of Phonerochaere chrysosporium as a separable biophase was set up. In sterilized and unsterilized soil-slurry, the distribution and dissipation of phenanthrene and pyrene in soil, fungal body of P. chrysosporium and water were independently quantified over the incubation periods. Biosorption and biodegradation contributions to bio-dissipation of dissolved- and sorbed-PAHs were identified. The biodegradation kinetics of PAHs by allochthonous P. chrysosporium and soil wild microorganisms was higher than those predicted by a coupled desorption-biodegradation model, suggesting both allochthonous and wild microorganisms could access sorbed-PAHs. The obvious hysteresis of PAHs in soil reduced their biodegradation, while the biosorbed-PAHs in P. chrysosporium body as an interim pool exhibited reversibly desorption and were almost exhausted via biodegradation. Both biosorption and direct biodegradation of PAHs in soil slurry were stimulated by allochthonous P. chrysosporium. After 90-day incubation, the respective biodegradation percentages for phenanthrene and pyrene were 63.8% and 51.9% in the unsterilized soil without allochthonous microorganisms, and then increased to 94.9% and 90.6% when amended with live P. chrysosporium. These indicate that allochthonous and wild microorganisms may synergistically attack sorbed-PAHs. (C) 2012 Elsevier B.V. All rights reserved.
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