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

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 activ...

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Published in:Desalination and water treatment 2016-07, Vol.57 (32), p.15125-15132
Main Authors: Huang, Jingang, Wu, Mengke, Tang, Junhong, Zhou, Rongbing, Chen, Jianjun, Han, Wei, Xie, Zhengmiao
Format: Article
Language:English
Subjects:
Activated sludge
Anaerobic conditions
Biomass
Chromium
Consortia
Control systems
Electron donor
Fatty acids
Fermentation
Flowers
Henna plant biomass
Hexavalent chromium
Lawsone
Lawsonia
Organic compounds
Plant biomass
Redox mediator
Sludge
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Summary: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.
ISSN:1944-3986
1944-3994
1944-3986
DOI:10.1080/19443994.2015.1070292