共查询到1条相似文献,搜索用时 0 毫秒
1.
Microbial populations related to PAH biodegradation in an aged biostimulated creosote-contaminated soil 总被引:1,自引:0,他引:1
A previous bioremediation survey on a creosote-contaminated soil showed that aeration and optimal humidity promoted depletion
of three-ringed polycyclic aromatic hydrocarbons (PAHs), but residual concentrations of four-ringed benzo(a)anthracene (B(a)A)
and chrysene (Chry) remained. In order to explain the lack of further degradation of heavier PAHs such as four-ringed PAHs
and to analyze the microbial population responsible for PAH biodegradation, a chemical and microbial molecular approach was
used. Using a slurry incubation strategy, soil in liquid mineral medium with and without additional B(a)A and Chry was found
to contain a powerful PAH-degrading microbial community that eliminated 89% and 53% of the added B(a)A and Chry, respectively.
It is hypothesized that the lack of PAH bioavailability hampered their further biodegradation in the unspiked soil. According
to the results of the culture-dependent and independent techniques Mycobacterium parmense, Pseudomonas mexicana, and Sphingobacterials group could control B(a)A and Chry degradation in combination with several microorganisms with secondary
metabolic activity. 相似文献