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Preliminary study on PAH degradation by bacteria from contaminated sediments in Xiamen Western Sea,Fujian, China
Authors:Maskaoui?Khalid,Zheng?Tianling  author-information"  >  author-information__contact u-icon-before"  >  mailto:wshwzh@jingxian.xumu.edu.cn"   title="  wshwzh@jingxian.xumu.edu.cn"   itemprop="  email"   data-track="  click"   data-track-action="  Email author"   data-track-label="  "  >Email author,Hong?Huasheng,Yu?Zhiming,Yuan?Jianjun,Hu?Zhong
Affiliation:(1) School of Life Sciences, Xiamen University, 361005 Xiamen, China;(2) Key Lab. of Marine Environmental Science, China Ministry of Education, 361005 Xiamen, China;(3) Key Lab. of Marine Ecology & Environmental Science, Chinese Academy of Sciences, 266071 Qingdao, China;(4) Department of Biology, Quanzhou Normal College, 362000 Quanzhou, China
Abstract:In order to estimate the biodegradation of three polycyclic aromatic hydrocarbons (PAHs) compounds, bacterial strains were isolated from marine sediments in three heavily contaminated sites (Yuandang Lake, Dongdu Port and Aquacultural zones in Maluan Bay) in Xiamen Western Sea. The results show three bacterial strains, which used pyrene as the sole carbon source, were identified as strains of Aureobacterium sp., Arthrobacter sp., Rhodococcus sp. The PAH-degrading bacteria isolated had a strong ability to degrade phenan-hrene, fluoranthene and pyrene at different degradation rates. The highest degradation rate was observed when three PAH compounds were mixed with an individual strain in the medium. The three PAHs were degraded after one week with a degradation rate of 89.94 % for phenanthrene and 93.4 % for both of fluoranthene and pyrene. In addition, after 25 days of incubation, the degradation rate was 99.98 % for phenanthrene and 99.97 % for both of fluoranthene and pyrene. Optical density was measured to estimate bacterial growth during the degradation of PAHs. Highest levels of bacterial growth were observed with a three PAH mixture in the culture, suggesting that the concentration of PAHs influenced bacterial growth and the highest levels of degradation for most series were detected after one week of incubation.
Keywords:PAHs   biodegradation   bacteria   Xiamen Western Sea
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