TY - JOUR
T1 - The effects of pre-aeration and inoculation on solid-state anaerobic digestion of rice straw
AU - Zhou, Ying
AU - LI, Chao
AU - Liu, Jing
AU - Ivo Achu, Nges
PY - 2017
Y1 - 2017
N2 - Pre-aeration was investigated for enhancing biodegradation of recalcitrant lignocellulosic structure of rice straw under various low temperatures regimes (25, 35 and 45 °C) and aeration durations (0, 2, 4, 6 and 8 days). It was demonstrated aerated rice straw for 2 days at 35 °C resulted in highest hydrolytic efficiency and biochemical methane potential (BMP) (355.3 ± 18.7 ml CH4/gVS). Furthermore, both methane yields and initiation speeds of the solid-state anaerobic digestion (SS-AD) were inversely proportional to substrate-to-inoculum ratios due to the accumulation of volatile fatty acids (VFAs) and poor mass transfer. The highest methane yield achieved under SS-AD was 234 ml CH4/gVS at TS of 16% which 72% of the BMP. Inoculum dilution with recycled water improved buffering capacity and mitigated accumulation of VFAs, resulting in an improved SS-AD performance. The combined pre-aeration and SS-AD was therefore established as a viable option to accelerate methane production for lignocellulosic biomass.
AB - Pre-aeration was investigated for enhancing biodegradation of recalcitrant lignocellulosic structure of rice straw under various low temperatures regimes (25, 35 and 45 °C) and aeration durations (0, 2, 4, 6 and 8 days). It was demonstrated aerated rice straw for 2 days at 35 °C resulted in highest hydrolytic efficiency and biochemical methane potential (BMP) (355.3 ± 18.7 ml CH4/gVS). Furthermore, both methane yields and initiation speeds of the solid-state anaerobic digestion (SS-AD) were inversely proportional to substrate-to-inoculum ratios due to the accumulation of volatile fatty acids (VFAs) and poor mass transfer. The highest methane yield achieved under SS-AD was 234 ml CH4/gVS at TS of 16% which 72% of the BMP. Inoculum dilution with recycled water improved buffering capacity and mitigated accumulation of VFAs, resulting in an improved SS-AD performance. The combined pre-aeration and SS-AD was therefore established as a viable option to accelerate methane production for lignocellulosic biomass.
KW - Solid-state anaerobic digestion
KW - Pre-aeration
KW - Inoculum concentration
KW - Substrate to inoculum ratio
KW - Rice straw
UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85006506883&origin=inward&txGid=2E1B57BE3E188AA3EA009382AD7E8488.wsnAw8kcdt7IPYLO0V48gA%3a87
U2 - 10.1016/j.biortech.2016.11.104
DO - 10.1016/j.biortech.2016.11.104
M3 - Article
C2 - 27919545
SN - 0960-8524
VL - 224
SP - 78
EP - 86
JO - Bioresource Technology
JF - Bioresource Technology
ER -