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Isolation and identification of salt-tolerant hydrocarbondegrading Rhodococcus strain and its roles in bioremediation of petroleum-contaminated saline soil.

WANG Jun1,2,3**, FAN Yan-hui1,2, WU Tao1,2, XIE Wen-jun1,3, YAO Zhi-gang1,2,3, ZHANG Han-jie1,2   

  1. (1Department of Life Sciences, Binzhou University, Binzhou 256603, Shandong, China; 2Shandong Provincial Engineering and Technology Research Center for Wild Plant Resources Development and Application of Yellow River Delta, Binzhou 256603, Shandong, China; 3Research Center for EcoEnvironmental Sciences Yellow River Delta, Shandong Key Laboratory of EcoEnvironmental Science for Yellow River Delta, Binzhou 256603, Shandong, China)
  • Online:2013-12-10 Published:2013-12-10

Abstract: A salt-tolerant hydrocarbon-degrading strain which can produce bioemulsifer was isolated from a petroleumcontaminated saline soil in the Yellow River Delta of China. This strain was preliminarily identified to be belonged the genus Rhodococcus, and named as Rhodococcus sp. JK-7. The characteristics of the hydrocarbondegradation and of the produced bioemulsifer of the strain under high concentration NaCl were studied under laboratory conditions, and the bioremediation of the petroleumcontaminated saline soil by the strain JK-7 were simulated. The strain JK-7 could grow with hydrocarbon as the sole carbon source under the NaCl concentration of 0-12%, and the degradation rate of crude oil by the strain reached 74.5%. This strain could produce a bioemulsifer with diesel as the sole carbon source under the NaCl concentration of 0-5%, and this bioemulsifier was characterized by good emiulsification effect, high thermostability, and high resistance to alkali and salt. The simulation results indicated the bioemulsifier produced by the strain JK-7 could obviously promote the strain to degrade crude oil in saline soil. Therefore, the strain JK-7 could have good prospect in the bioremediation of petroleumcontaminated saline soil.