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Desalination and Water Treatment Volume 57, 2016 - Issue 32
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Articles

Enhanced bio-reduction of hexavalent chromium by an anaerobic consortium using henna plant biomass as electron donor and redox mediator

Jingang HuangInstitute of Environmental Science and Engineering, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Room S104, The 6th Building, Hangzhou310018, P.R. China, Tel./Fax: +86 571 86919158;State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai200092, P.R. ChinaCorrespondence[email protected]
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Mengke WuInstitute of Environmental Science and Engineering, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Room S104, The 6th Building, Hangzhou310018, P.R. China, Tel./Fax: +86 571 86919158Correspondence[email protected]
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Junhong TangInstitute of Environmental Science and Engineering, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Room S104, The 6th Building, Hangzhou310018, P.R. China, Tel./Fax: +86 571 86919158Correspondence[email protected]
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Rongbing ZhouInstitute of Environmental Science and Engineering, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Room S104, The 6th Building, Hangzhou310018, P.R. China, Tel./Fax: +86 571 86919158Correspondence[email protected]
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Jianjun ChenInstitute of Environmental Science and Engineering, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Room S104, The 6th Building, Hangzhou310018, P.R. China, Tel./Fax: +86 571 86919158Correspondence[email protected]
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Wei HanInstitute of Environmental Science and Engineering, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Room S104, The 6th Building, Hangzhou310018, P.R. China, Tel./Fax: +86 571 86919158Correspondence[email protected]
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Zhengmiao XieInstitute of Environmental Science and Engineering, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Room S104, The 6th Building, Hangzhou310018, P.R. China, Tel./Fax: +86 571 86919158Correspondence[email protected]
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Pages 15125-15132 | Received 21 Jan 2015, Accepted 30 Jun 2015, Published online: 16 Jul 2015
 
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Abstract

The effects of henna (Lawsonia inermis) flower biomass on the enhanced bio-reduction of Cr(VI) were investigated in this study. The average Cr(VI) removal rate in the anaerobic system with the addition of henna flower powder achieved 2.04 mg L−1 h−1, which was much higher than the rates in the activated sludge control, autoclaved sludge control, and adsorption control. Under anaerobic conditions, the organic compounds in henna flower powder could be leached out from the solid phase to the mixed solution, and then fermented to volatile fatty acids and H2, acting as effective electron donors for the rapid bio-reduction of Cr(VI). The released and/or fixed lawsone not only shuttles electrons from the donor to the final acceptor of Cr(VI), but might also inversely improves the fermentation process of henna flower biomass.

Acknowledgments

This research was supported by the Foundation of the State Key Laboratory of Pollution Control and Resource Reuse, China (No. PCRRF13013), the Research Foundation of Educational Commission of Zhejiang Province of China (No. Y201430800), the National Science Foundation of China (No. 51408171), and the National Science Foundation of China (No. 41373121).

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