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Journal Title
Title of Journal: Water Air Soil Pollut
Abbravation: Water, Air, & Soil Pollution
Publisher
Springer International Publishing
DOI
10.1016/j.accpm.2016.02.003
ISSN
1573-2932
Removal of hexavalent chromium by precipitation from wastewater has received increasing interest in recent years This study described the behavior of chromium and iron coprecipitation mediated by Acidithiobacillus ferrooxidans DC in an artificial simulated acid environment In four parallel groups with the different concentrations of chromiumVI 30 60 90 120 mg/L the precipitation efficiencies of chromium were enhanced uniformly by A ferrooxidans DC But chromium coprecipitation efficiency reduced as the initial chromium concentration increasing at the early stage Especially in the 30 and 60 mg/L chromium groups the maximum precipitation efficiency of chromium was improved from 5622 5501 to 7572 7437 on the fourth day Additionally the characteristics of the precipitates were analyzed by xray diffraction XRD scanning electron microscope SEM and Fourier transform infrared spectroscopy FTIR Results showed that the precipitates were mainly present as jarosites and A ferrooxidans was conducive to producing precipitates with good crystalline form and uniform dispersion with pH decrease redox potential ORP increase and iron oxidation It can be concluded that the chromium could be incorporated into the jarosites through a certain biochemical reaction such as structural substitution which shows a potential to remove chromium from wastewater by the biocoprecipitation