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Characteristics of Removal of Cr (VI) by Rhodococcus sp. Chr-9 and Exiguobacterium sp. Chr-43(PDF)

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

2012 06
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Characteristics of Removal of Cr (VI) by Rhodococcus sp. Chr-9 and Exiguobacterium sp. Chr-43
XU Lian SUN Jiquan WU Xiaolei TANG Yueqin CHEN Fuming
(1College of Engineering, Peking University, Beijing 100871, China)
(2Research Institute of Tsinghua University in Shenzhen, Shenzhen Key Laboratory of Separation Technology, Shenzhen 518057, China)
(3Department of Chemical Engineering, Tsinghua University, Beijing, 100084, China)
(4College of Architecture and Environment, Sichuan University, Chengdu, 610065, China)
Cr (VI) Rhodococcus sp. Exiguobacterium sp. bioremediation environment factor wastewater treatment

For understanding the effect of environment factors on the removal of chromate by bacterial strains and to provide chromate-removing strains for the bioremediation of environments contaminated by chromate, two Gram-positive bacterial strains designated as Chr-9 and Chr-43 respectively, capable of removing Cr (VI) in LB medium, were isolated from sludge collected from one tannery plant in Binzhou, Shandong, China. Based on 16S rRNA genes and phenotype characteristics, strain Chr-9 and Chr-43 were identified as Rhodococcus and Exiguobacterium strains, respectively. The optimal temperature and pH for Cr (VI)-removal by the two strains were 35 ℃ and pH 7.0, respectively. The removal of Cr (VI) was enhanced by supplementation of 0.1~0.5 mol/L NO3-, SO42-, and Cl- for strain Chr-9 and by supplementation of 0.1~0.2 mol/L NO3-, SO42, and Cl- for strain Chr-43. The growth and Cr (VI)-removal rate of strain Chr-43 were both enhanced by co-cultivation with strain Chr-9. These results indicated that the removal of chromate by bacterial strains could be affected by temperature, pH, negative ions, and other co-cultured microbes. Fig 7, Tab 1, Ref 24


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Last Update: 2012-12-28