Journal
JOURNAL OF ENVIRONMENTAL MANAGEMENT
Volume 203, Issue -, Pages 278-285Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2017.07.075
Keywords
Sulfate-reducing bacteria; Sulfate; Mathematical modelling; Zero valent iron; Heavy metal toxicity assessment
Categories
Funding
- National Nature Science Foundation of China [21077075]
- Program of Introducing Talents of Discipline to Universities [B06006]
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A simple and valid toxicity evaluation of Zn2+, Mn2+ and Cr6+ on sulfate-reducing bacteria (SRB) and heavy metal removal were investigated using the SRB system and SRB+Fe-0 system. The heavy metal toxicity coefficient (beta) and the heavy metal concentration resulting in 50% inhibition of sulfate reduction (I) from a modeling process were proposed to evaluate the heavy metal toxicity and nonlinear regression was applied to search for evaluation indices beta and I. The heavy metal toxicity order was Cr6+ > Mn2+ > Zn2+. Compared with the SRB system, the SRB+Fe-0 system exhibited a better capability for sulfate reduction and heavy metal removal. The heavy metal removal was above 99% in the SRB+Fe-0 system, except for Mn2+. The energy-dispersive spectroscopy (EDS) analysis showed that the precipitates were removed primarily as sulfide for Zn2+ and hydroxide for Mn2+ and Cr6+.The method of evaluating the heavy metal toxicity on SRB was of great significance to understand the fundamentals of the heavy metal toxicity and inhibition effects on the microorganism and regulate the process of microbial sulfate reduction. (C) 2017 Elsevier Ltd. All rights reserved.
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