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The enhancement of Acidithiobacillus ferrooxidans on the removal of Cr(VI) from acid coal mine drainage by high-sulfur coal gangue |
SONG Yong-wei1, LIU Ye-lin1,2, WANG Rui1, WANG He-ru1, CAO Yan-xiao1 |
1. Department of Environmental Science and Engineering, Zhongnan University of Economics and Law, Wuhan 430073, China; 2. School of Environment, Harbin Institute of Technology, Harbin 150090, China |
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Abstract The removal efficiency of Cr(VI) in simulated acid coal mine drainage (ACMD) was investigated through Acidithiobacillus ferrooxidans combined with high-sulfur coal gangue (rich in FeS2). Results showed that in stimulated ACMD (pH=2.5) with 50mg/L Cr(VI), and 6.67~33.33g/L of high-sulfur coal gangue could achieve the ideal effect on Cr(VI) removal. 50mg/L of Cr (VI) could be completely reduced to Cr (III) by FeS2 at 24h. 7.1%, 20.2% and 29.1% of Cr(III) was removed via absorption by 6.67, 13.33, and 33.33g/L high-sulfur coal gangue at 120h, respectively. However, after the reduction and adsorption of high-sulfur coal gangue, most of Cr remains in simulated ACMD as Cr(III), and large amount of high-sulfur coal gangue also led to secondary pollutants (Fe2+, Fe3+ or SO42-). After the introduction of A.ferrooxidans and 9K medium into high-sulfur coal gangue and Cr(VI) system, A.ferrooxidans mediated Fe2+ biooxidation and Fe3+ hydrolytic mineralization promoted the conversion of Fe2+, Fe3+ or SO42- to secondary iron minerals (including schwertmannite and jarosite), so that residual Cr(III) was removed by adsorption or co-precipitation. Under the enhancement of A.ferrooxidans, the removal efficiency of Cr(VI) in simulated ACMD could reached as high as 99.4% in 96h.
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Received: 08 February 2020
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