Anaerobic digestion of industrial hemp-Effect of harvest time on methane energy yield per hectare |
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Authors: | E. Kreuger,T. PradeF. Escobar,S.-E. SvenssonJ.-E. Englund,L. Bjö rnsson |
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Affiliation: | a Department of Biotechnology, Lund University, P.O. Box 124, SE-221 00 Lund, Swedenb Department of Agriculture-Farming Systems, Technology and Product Quality, Swedish University of Agricultural Sciences, P.O. Box 104, SE-230 53 Alnarp, Sweden |
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Abstract: | There is a worldwide emphasis to increase the share of renewable transportation fuels. When using agricultural land for production of renewable transportation fuels, the energy output per hectare for different crops and transportation fuels is a crucial factor. In this study, the gross methane energy yield per hectare from anaerobic digestion of industrial hemp (Cannabis sativa L.), was determined at four different harvest times between July and October in Southern Sweden, a cold climate region. The biomass yield was determined for three years and the methane yield was determined for two years through the biochemical methane potential test. The highest biomass yield, 16 tonnes dry matter per hectare on an average, and the highest methane energy yield per hectare was achieved when the hemp was harvested in September or October, with an average gross methane energy yield of 136 ± 24 GJ per hectare. There was no significant difference in the specific methane yield between the harvest times; the average being 234 ± 35 m3 per tonne volatile solids. Biogas from hemp turned out to be a high yielding alternative to the currently dominating renewable transportation fuels produced from crops grown in Sweden: ethanol from wheat and biodiesel from rapeseed. |
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Keywords: | Energy crop Transportation Lignocellulose Bio-fuel Biogas Cannabis sativa |
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