TY - JOUR
T1 - Enhanced hydrolysis and acidification of cellulose at high loading for methane production via anaerobic digestion supplemented with high mobility nanobubble water
AU - Wang, Xuezhi
AU - Yuan, Tian
AU - Guo, Zitao
AU - Han, Hanlin
AU - Lei, Zhongfang
AU - Shimizu, Kazuya
AU - Zhang, Zhenya
AU - Lee, Duu-Jong
PY - 2020/2
Y1 - 2020/2
N2 - In this study, CH4 production from anaerobic digestion (AD) of refractory cellulose was investigated at a high loading of 3.5 (VScellulose/VSinoculum) under nanobubble water (NBW) addition. A longer proton spin-spin relaxation time (2611–2906 ms) of NBW during 35 days’ storage reflected its high mobility and diffusion of water molecules. Higher volatile fatty acids were yielded at the hydrolysis-acidification stage under NBW addition. Methanogenesis tests showed that Air-NBW and CO2-NBW supplementation accelerated the utilization of crystalline cellulose, achieving methane yields of 264 and 246 mL CH4/g-VSreduced, increasing by 18% and 10% compared to deionized water addition (the control), respectively. In addition, under NBW addition the cellulose crystallinity reduction was enhanced by 14–20% with microbial community being enriched with hydrolytic and methanogenic bacteria. Results from this work suggest that NBW environment with no chemical addition and relatively low energy consumption is advantageous for enhanced AD process of cellulosic biomass.
AB - In this study, CH4 production from anaerobic digestion (AD) of refractory cellulose was investigated at a high loading of 3.5 (VScellulose/VSinoculum) under nanobubble water (NBW) addition. A longer proton spin-spin relaxation time (2611–2906 ms) of NBW during 35 days’ storage reflected its high mobility and diffusion of water molecules. Higher volatile fatty acids were yielded at the hydrolysis-acidification stage under NBW addition. Methanogenesis tests showed that Air-NBW and CO2-NBW supplementation accelerated the utilization of crystalline cellulose, achieving methane yields of 264 and 246 mL CH4/g-VSreduced, increasing by 18% and 10% compared to deionized water addition (the control), respectively. In addition, under NBW addition the cellulose crystallinity reduction was enhanced by 14–20% with microbial community being enriched with hydrolytic and methanogenic bacteria. Results from this work suggest that NBW environment with no chemical addition and relatively low energy consumption is advantageous for enhanced AD process of cellulosic biomass.
KW - Anaerobic digestion
KW - Cellulose crystallinity
KW - Methane production
KW - Nanobubble water
KW - Proton spin-spin relaxation time
UR - http://www.scopus.com/inward/record.url?scp=85076029723&partnerID=8YFLogxK
UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-85076029723&origin=recordpage
U2 - 10.1016/j.biortech.2019.122499
DO - 10.1016/j.biortech.2019.122499
M3 - RGC 21 - Publication in refereed journal
C2 - 31835146
SN - 0960-8524
VL - 297
JO - Bioresource Technology
JF - Bioresource Technology
M1 - 122499
ER -