Journal
BIORESOURCE TECHNOLOGY
Volume 250, Issue -, Pages 140-147Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2017.11.020
Keywords
Anaerobic biorefinery; Digestate; Lignocellulosic biomass; Hydrothermal carbonization; Torrefaction
Funding
- Sun Grant Western Regional Center at Oregon State University through the United States Department of Agriculture
- Sun Grant Western Regional Center at Oregon State University through National Institute of Food and Agriculture - United States [2012-03373]
- Biomass Research and Development Initiative (BRDI) - United States [2012-10006-1945]
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Anaerobic digestion (AD) of lignocellulosic biomass i.e. Napier grass (Pennisetum purpureum), was investigated via a series of batch and bench-scale experiments. Two semi-continuous bench-scale horizontal bioreactors were operated in parallel for nearly 300 days, and the reactors were able to handle the organic loading rate (OLR) up to 6 kg volatile solids (VS)/m(3)-d, which was among the highest OLR reported in the literature for lignocellulosic biomass. Hemicellulose was the main structural carbohydrate of lignocellulosic biomass per unit respective mass (dry weight) basis contributing to methane production. The cellulose- and lignin-rich digestate was further examined for its bioenergy potential via torrefaction and hydrothermal carbonization, and was found to have higher mass and energy yield compared with those of raw Napier grass. The produced solid char has energy content similar to bituminous coal with low ash content. Thus, this study provided a successful integration of anaerobic digestion with thermochemical conversion representing a biorefinery concept for lignocellulosic feedstocks.
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