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Effect of Hydraulic Retention Time on Fermentative Hydrogen and Byproducts Production from Food Waste  

Kim, Sang-Hyoun (Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology)
Shin, Hang-Sik (Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology)
Publication Information
KSBB Journal / v.20, no.6, 2005 , pp. 443-446 More about this Journal
Abstract
Hydrogen fermentation from food waste was attempted at different hydraulic retention time(HRT, 18-42 h). A continuous reactor fed with ground, alkali-treated and diluted food waste(average VS 4.4%) exhibited stable hydrogen production during 126 days. Hydrogen production depended on HRT, resulting in the maximum values of 25.8 mL $H_2/g\;VS_{added}$, 0.36 mol $H_2/mol\;hexose_{added}$ and 0.91 L $H_2/L/d$ at HRT 30 h. n-Butyrate and isopropanol production increased with hydrogen production increased, while acetate production decreased. The fermentation efficiency ranged from 53.3 to 65.7%, which implied that hydrogen fermentation would substitute conventional acidogenesis of food waste.
Keywords
Acidogenesis; n-butyrate; food waste; hydraulic retention time; hydrogen production;
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