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J Hazard Mater

Title:		Enhanced azo dye removal in a continuously operated up-flow anaerobic filter packed with henna plant biomass
Author(s):		Huang J; Wu M; Chen J; Liu X; Chen T; Wen Y; Tang J; Xie Z;
Address:		"Institute of Environmental Science and Engineering, Hangzhou Dianzi University, Hangzhou 310018, PR China; State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, PR China. Electronic address: hjg@hdu.edu.cn. Institute of Environmental Science and Engineering, Hangzhou Dianzi University, Hangzhou 310018, PR China. State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, PR China"
Journal Title:		J Hazard Mater
Year:		2015
Volume:		20150527
Issue:
Page Number:		158 - 164
DOI:		10.1016/j.jhazmat.2015.05.044
ISSN/ISBN:		1873-3336 (Electronic) 0304-3894 (Linking)
Abstract:		"Effects of henna plant biomass (stem) packed in an up-flow anaerobic bio-filter (UAF) on an azo dye (AO7) removal were investigated. AO7 removal, sulfanilic acid (SA) formation, and pseudo first-order kinetic constants for these reactions (kAO7 and kSA) were higher in the henna-added UAF (R2) than in the control UAF without henna (R1). The maximum kAO7 in R1 and R2 were 0.0345 and 0.2024 cm(-1), respectively, on day 18; the corresponding molar ratios of SA formation to AO7 removal were 0.582 and 0.990. Adsorption and endogenous bio-reduction were the main AO7 removal pathways in R1, while in R2 bio-reduction was the dominant. Organics in henna could be released and fermented to volatile fatty acids, acting as effective electron donors for AO7 reduction, which was accelerated by soluble and/or fixed lawsone. Afterwards, the removal process weakened over time, indicating the demand of electron donation and lawsone-releasing during the long-term operation of UAF"
Keywords:		Anaerobiosis Azo Compounds/*isolation & purification *Biomass Coloring Agents/*isolation & purification Filtration/*instrumentation Lawsonia Plant/*metabolism Oxidation-Reduction Electron donor Henna plant biomass Lawsone Redox mediator Up-flow anaerobic;
Notes:		"MedlineHuang, Jingang Wu, Mengke Chen, Jianjun Liu, Xiuyan Chen, Tingting Wen, Yue Tang, Junhong Xie, Zhengmiao eng Research Support, Non-U.S. Gov't Netherlands 2015/06/24 J Hazard Mater. 2015 Dec 15; 299:158-64. doi: 10.1016/j.jhazmat.2015.05.044. Epub 2015 May 27"