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The reduction of V(V) by Shewanella oneidensis MR-1 and Shewanella putrefaciens and influencing factors |
LI Jing, YANG Yu-rong, ZHU Guang-sen, LIU Xiao-hong, SI You-bin |
School of Resources and Environment, Anhui Agricultural University, Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention, Hefei 230036, China |
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Abstract Under the laboratory and simulated conditions, the tolerance of Shewanella oneidensis MR-1 and Shewanella putrefaciens to V(V) was tested with anaerobic incubation. The effects of different V(V) concentration, inoculated quantity, pH value and anthraquinone-2,6-disulfonate (AQDS) concentration on V(V) reduction were investigated. The mechanisms of V(V) microbial reduction were studied by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The results showed that V(V) at the concentration within 10mg/L slightly affected the growth of S. oneidensis MR-1 and S. putrefronens, while cells growth and V(V) reduction were inhibited when the concentration of V(V) was over 20mg/L. With the increasing quantity of microbial inoculation, the reduction ability of the two bacteria to V(V) was gradually enhanced. The optimum pH for the growth of two bacteria was about 7.0, and the reduction rate of V(V) in weak alkaline growth environment was higher than that in the weak acid environment. The addition of 1mmol/L AQDS could enhance the reduction of V(V). The SEM analysis were carried out for the bacteria after 3days incubation, which found that S. oneidensis MR-1 and S. putrefaciens reduced V(V), accompanied with a small amount of adsorption. The XPS energy spectrum analysis indicated that V(V) were reduced to V(IV) by S. oneidensis MR-1 and S. putrefaciens.
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Received: 17 June 2019
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