Journal
BIORESOURCE TECHNOLOGY
Volume 154, Issue -, Pages 240-247Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2013.12.045
Keywords
Solid state anaerobic digestion; Co-digestion; Leachate recirculation; Methane; Biogas
Funding
- USDA NIFA Biomass Research and Development Initiative Program [2012-10008-20302]
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Co-digestion of soybean processing waste (SPW) and hay in solid-state anaerobic digestion (SS-AD) for biogas production was investigated. Effects of the SPW to hay ratio, feedstock to effluent (inoculum) ratio, premixing of effluent with feedstock, and leachate recirculation on biogas production via SS-AD were studied. The highest methane yield of 258 L/kg VS was obtained with a SPW/hay ratio of 75: 25 and feedstock/effluent (F/E) ratio of 3, which was 148% and 50% higher than that of 100% SPW and 100% hay, respectively. Increasing the F/E ratio from 1 to 5 decreased methane yield, however the highest volumetric methane yield (16.2 L/L-reactor) was obtained at an F/E of 3. There was no significant difference in methane yields between premixing 50% and 100% of the effluent. Leachate recirculation significantly accelerated the SS-AD start-up process when effluent was not completely premixed. (C) 2013 Elsevier Ltd. All rights reserved.
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