TY - JOUR
T1 - Enhancing methane production of anaerobic sludge digestion by microaeration
T2 - Enzyme activity stimulation, semi-continuous reactor validation and microbial community analysis
AU - Ruan, Danian
AU - Zhou, Zhen
AU - Pang, Hongjian
AU - Yao, Jie
AU - Chen, Guang
AU - Qiu, Zhan
N1 - Publisher Copyright:
© 2019 Elsevier Ltd
PY - 2019/10
Y1 - 2019/10
N2 - Effects of microaeration pretreatment on sludge hydrolysis, biogas production and microbial community structure in anaerobic digestion (AD) were investigated by bench-scale tests and semi-continuous experiments. Bench tests showed that microaeration led to the release of dissolved organic matters, generation of volatile fatty acids and stimulation of enzyme activity. Correlation analysis showed that methane production was significantly correlated with the activity of α-glucosidase at 0.01 level, and with protease activity, released polysaccharides and VFAs at 0.05 level. Semi-continuous experiments showed that microaeration accelerated the utilization of organic matters, increased biogas production by 16.4%, enhanced methane content in biogas, and improved sludge dewaterability. Microbial community structure analysis showed that microaeration promoted enrichment of hydrolytic and fermentative bacteria in AD reactor rather than methanogenic bacteria, and aceticlastic methanogenesis was the main methanogenic pathway for methane production.
AB - Effects of microaeration pretreatment on sludge hydrolysis, biogas production and microbial community structure in anaerobic digestion (AD) were investigated by bench-scale tests and semi-continuous experiments. Bench tests showed that microaeration led to the release of dissolved organic matters, generation of volatile fatty acids and stimulation of enzyme activity. Correlation analysis showed that methane production was significantly correlated with the activity of α-glucosidase at 0.01 level, and with protease activity, released polysaccharides and VFAs at 0.05 level. Semi-continuous experiments showed that microaeration accelerated the utilization of organic matters, increased biogas production by 16.4%, enhanced methane content in biogas, and improved sludge dewaterability. Microbial community structure analysis showed that microaeration promoted enrichment of hydrolytic and fermentative bacteria in AD reactor rather than methanogenic bacteria, and aceticlastic methanogenesis was the main methanogenic pathway for methane production.
KW - Anaerobic digestion
KW - Enzyme activity
KW - Methane yield
KW - Micro-aeration pretreatment
KW - Microbial community
UR - https://www.scopus.com/pages/publications/85067398360
U2 - 10.1016/j.biortech.2019.121643
DO - 10.1016/j.biortech.2019.121643
M3 - 文章
C2 - 31228743
AN - SCOPUS:85067398360
SN - 0960-8524
VL - 289
JO - Bioresource Technology
JF - Bioresource Technology
M1 - 121643
ER -
