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Bioresour Technol

Title:		Hydrogen and methane production by co-digestion of waste activated sludge and food waste in the two-stage fermentation process: substrate conversion and energy yield
Author(s):		Liu X; Li R; Ji M; Han L;
Address:		"School of Environmental Science and Engineering, Tianjin University, Weijin Road 92, Tianjin 300072, China. Electronic address: liuxinyuan11@163.com. School of Environmental Science and Engineering, Tianjin University, Weijin Road 92, Tianjin 300072, China. Electronic address: liruying@tju.edu.cn. School of Environmental Science and Engineering, Tianjin University, Weijin Road 92, Tianjin 300072, China. Electronic address: jimin@tju.edu.cn. School of Environmental Science and Engineering, Tianjin University, Weijin Road 92, Tianjin 300072, China. Electronic address: hanlitju@163.com"
Journal Title:		Bioresour Technol
Year:		2013
Volume:		20130726
Issue:
Page Number:		317 - 323
DOI:		10.1016/j.biortech.2013.07.096
ISSN/ISBN:		1873-2976 (Electronic) 0960-8524 (Linking)
Abstract:		"Batch experiments were conducted to produce hydrogen and methane from waste activated sludge and food waste by two-stage mesophilic fermentation. Hydrogen and methane production, energy yield, soluble organic matters, volatile solid removal efficiency and carbon footprint were investigated during two-stage digestion at various food waste proportions. The highest energy yield reached 14.0 kJ/g-VS at the food waste proportion of 85%, with hydrogen and methane yields of 106.4 ml-H2/g-VS and 353.5 ml-CH4/g-VS respectively. The dominant VFA composition was butyrate for co-digestion and sole food waste fermentation, whereas acetate was dominate in VFA for sole waste activated sludge fermentation. The VS removal efficiencies of co-digestion were 10-77% higher than that of waste activated sludge fermentation. Only 0.1-3.2% of the COD in feedstock was converted into hydrogen, and 14.1-40.9% to methane, with the highest value of 40.9% in methane achieved at food waste proportion of 85%"
Keywords:		"Ammonium Compounds/chemistry Biodegradation, Environmental Biological Oxygen Demand Analysis Bioreactors Carbohydrates/chemistry Fatty Acids/chemistry *Fermentation Food Hydrogen/*chemistry Methane/*chemistry Proteins/chemistry Refuse Disposal/*methods Se;"
Notes:		"MedlineLiu, Xinyuan Li, Ruying Ji, Min Han, Li eng Research Support, Non-U.S. Gov't England 2013/08/21 Bioresour Technol. 2013 Oct; 146:317-323. doi: 10.1016/j.biortech.2013.07.096. Epub 2013 Jul 26"