Journal of Environmental Management 203 (2017) 278e285 Contents lists available at ScienceDirect Journal of Environmental Management journal homepage: www.elsevier.com/locate/jenvman Research article Bioassessment of heavy metal toxicity and enhancement of heavy metal removal by sulfate-reducing bacteria in the presence of zero valent iron a a, * b Jing Guo , Yong Kang , Ying Feng School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300350, China School of Mechanical Engineering, Shenyang University of Chemical Engineering, Shenyang, 110142, China article i nf o abstract 2þ 2þ 6þ Article history: A simple and valid toxicity evaluation of Zn ,Mn and Cr on sulfate-reducing bacteria (SRB) and Received 13 March 2017 heavy metal removal were investigated using the SRB system and SRBþFe system. The heavy metal Received in revised form toxicity coefﬁcient (b) and the heavy metal concentration resulting in 50% inhibition of sulfate reduction 27 July 2017 (I) from a modeling process were proposed to evaluate the heavy metal toxicity and nonlinear regression Accepted 28 July 2017 was applied to search for evaluation indices b and I. The heavy metal toxicity order was Available online 10 August 2017 6þ 2þ 2þ 0 Cr > Mn > Zn . Compared with the SRB
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