title: Evaluation of integrated anaerobic digestion and hydrothermal carbonization for bioenergy production.
abstract: Lignocellulosic biomass is one of the most abundant yet underutilized renewable energy resources. Both anaerobic digestion (AD) and hydrothermal carbonization (HTC) are promising technologies for bioenergy production from biomass in terms of biogas and HTC biochar, respectively. In this study, the combination of AD and HTC is proposed to increase overall bioenergy production. Wheat straw was anaerobically digested in a novel upflow anaerobic solid state reactor (UASS) in both mesophilic (37 °C) and thermophilic (55 °C) conditions. Wet digested from thermophilic AD was hydrothermally carbonized at 230 °C for 6 hr for HTC biochar production. At thermophilic temperature, the UASS system yields an average of 165 LCH4/kgVS (VS: volatile solids) and 121 L CH4/kgVS at mesophilic AD over the continuous operation of 200 days. Meanwhile, 43.4 g of HTC biochar with 29.6 MJ/kgdry_biochar was obtained from HTC of 1 kg digestate (dry basis) from mesophilic AD. The combination of AD and HTC, in this particular set of experiment yield 13.2 MJ of energy per 1 kg of dry wheat straw, which is at least 20% higher than HTC alone and 60.2% higher than AD only.
authors: APECS Group, Leibniz Institute for Agricultural Engineering; TReza@atb-potsdam.de.
authors: M Toufiq
authors: MT
authors: Reza
authors: APECS Group, Leibniz Institute for Agricultural Engineering.
authors: Maja
authors: M
authors: Werner
authors: APECS Group, Leibniz Institute for Agricultural Engineering.
authors: Marcel
authors: M
authors: Pohl
authors: APECS Group, Leibniz Institute for Agricultural Engineering.
authors: Jan
authors: J
authors: Mumme
mesh_terms: D000693:Anaerobiosis; D056804:Biofuels; D018533:Biomass; D019149:Bioreactors; D002244:Carbon / Q000737:chemistry*; D006358:Hot Temperature; D008031:Lignin / Q000737:chemistry* / Q000378:metabolism
chemical_list: D056804:Biofuels; C036909:lignocellulose; D002244:Carbon; D008031:Lignin