title: Pilot-scale anaerobic co-digestion of municipal biomass waste and waste activated sludge in China: effect of organic loading rate.
abstract: The effects of organic loading rate on the performance and stability of anaerobic co-digestion of municipal biomass waste (MBW) and waste activated sludge (WAS) were investigated on a pilot-scale reactor. The results showed that stable operation was achieved with organic loading rates (OLR) of 1.2-8.0 kg volatile solid (VS) (m(3)d)(-1), with VS reduction rates of 61.7-69.9%, and volumetric biogas production of 0.89-5.28 m(3) (m(3)d)(-1). A maximum methane production rate of 2.94 m(3) (m(3)d)(-1) was achieved at OLR of 8.0 kg VS (m(3)d)(-1) and hydraulic retention time of 15 days. With increasing OLRs, the anaerobic reactor showed a decrease in VS removal rate, average pH value and methane concentration, and a increase of volatile fatty acid concentration. By monitoring the biogas production rate (BPR), the anaerobic digestion system has a higher acidification risk under an OLR of 8.0 kg VS (m(3)d)(-1). This result remarks the possibility of relating bioreactor performance with BPR in order to better understand and monitor anaerobic digestion process.
authors.affiliation: School of Environment, Tsinghua University, Beijing 100084, China. liuxiao07@mails.tsinghua.edu.cn
authors.forename: Xiao
authors.initials: X
authors.lastname: Liu
authors.forename: Wei
authors.initials: W
authors.lastname: Wang
authors.forename: Yunchun
authors.initials: Y
authors.lastname: Shi
authors.forename: Lei
authors.initials: L
authors.lastname: Zheng
authors.forename: Xingbao
authors.initials: X
authors.lastname: Gao
authors.forename: Wei
authors.initials: W
authors.lastname: Qiao
authors.forename: Yingjun
authors.initials: Y
authors.lastname: Zhou
mesh_terms: D000693:Anaerobiosis; D001673:Biodegradation, Environmental; D056804:Biofuels; D018533:Biomass; D002681:China; D005232:Fatty Acids, Volatile / Q000378:metabolism; D006863:Hydrogen-Ion Concentration; D008697:Methane / Q000096:biosynthesis*; D010865:Pilot Projects; D012037:Refuse Disposal / Q000295:instrumentation* / Q000379:methods*
chemical_list: D056804:Biofuels; D005232:Fatty Acids, Volatile; D008697:Methane