TY - JOUR
T1 - Effect of wheat straw pretreated with liquid fraction of digestate from different substrates on anaerobic digestion performance and microbial community characteristics
AU - Wei, Yufang
AU - Lan, Yanyan
AU - Li, Xiujin
AU - Gao, Minghan
AU - Yuan, Shuai
AU - Yuan, Hairong
N1 - Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2022/4/20
Y1 - 2022/4/20
N2 - The effects of liquid fraction of digestate (LFD) pretreatment on anaerobic digestion (AD) performance and microbial community characteristics were estimated. Prior to AD, LFD (LFDSM, LFDFW, and LFDWS) collected separately from three continuously stirred tank reactors (CSTRs) using swine manure (SM), food waste (FW), and wheat straw (WS) as the mono-substrate was applied to pretreat WS. The results showed that AD with LFD pretreatment resulted in biomethane yields of 240.2–277.9 mL·gVS−1, a 33.57%–54.54% improvement over the yield of the control, and also produced a time saving of 32.26%–46.77%. The pretreatment parameters were optimized for LFD pretreatment. The enhancement effect was in the order of LFDFW > LFDSM > LFDWS. Simultaneously, the cellulose, hemicellulose and lignin contents in the WS and their characteristics (surface properties, crystallinity index, etc.) varied accordingly. The function of the microbial community was strengthened during the pretreatment stage, but the structure of the microbial community had a clear response to the LFD source substrates. Bacteroidetes was the most dominant phyla and was positively correlated with the hydrolysis rate. Consequently, the LFD from the different substrates used as pretreat agents could improve the AD performance of WS.
AB - The effects of liquid fraction of digestate (LFD) pretreatment on anaerobic digestion (AD) performance and microbial community characteristics were estimated. Prior to AD, LFD (LFDSM, LFDFW, and LFDWS) collected separately from three continuously stirred tank reactors (CSTRs) using swine manure (SM), food waste (FW), and wheat straw (WS) as the mono-substrate was applied to pretreat WS. The results showed that AD with LFD pretreatment resulted in biomethane yields of 240.2–277.9 mL·gVS−1, a 33.57%–54.54% improvement over the yield of the control, and also produced a time saving of 32.26%–46.77%. The pretreatment parameters were optimized for LFD pretreatment. The enhancement effect was in the order of LFDFW > LFDSM > LFDWS. Simultaneously, the cellulose, hemicellulose and lignin contents in the WS and their characteristics (surface properties, crystallinity index, etc.) varied accordingly. The function of the microbial community was strengthened during the pretreatment stage, but the structure of the microbial community had a clear response to the LFD source substrates. Bacteroidetes was the most dominant phyla and was positively correlated with the hydrolysis rate. Consequently, the LFD from the different substrates used as pretreat agents could improve the AD performance of WS.
KW - Anaerobic digestion
KW - Liquid fraction of digestate
KW - Microbial community
KW - Pretreatment
KW - Wheat straw
UR - http://www.scopus.com/inward/record.url?scp=85119931804&partnerID=8YFLogxK
U2 - 10.1016/j.scitotenv.2021.151764
DO - 10.1016/j.scitotenv.2021.151764
M3 - Article
C2 - 34800463
AN - SCOPUS:85119931804
SN - 0048-9697
VL - 818
JO - Science of the Total Environment
JF - Science of the Total Environment
M1 - 151764
ER -
