title: Effects of thermal pre-treatment on anaerobic co-digestion of municipal biowastes at high organic loading rate.
abstract: Anaerobic co-digestion of thermal pre-treated municipal biowaste (MBW) is a field of research that has had limited contributions to date. In this study, laboratory-scale semi-continuously fed anaerobic digesters treating thermally treated and non-treated MBW were operated at high organic loading rates (OLR). The results show that the methanogenesis process was inhibited by the accumulated volatile fatty acids when 30% (w/w) of dewatered activated sludge (DAS) was co-digested with food waste (FW) and fruit/vegetable residue (FVR) at high OLR≥10 kg volatile solid m(-3) d(-1). Co-digestion with thermal hydrolysed DAS can significantly improve digester performance. In contrast to DAS, some adverse effects of thermal pretreatment on the biodegradability of FW and FVR were observed. Therefore, co-digestion of FW, FVR with thermally treated DAS is suggested as an alternative to promote high methane production and process stability.
authors.affiliation: Department of Environmental Engineering, School of Environment, Tsinghua University, Beijing 100084, PR China. Electronic address: jianbinguo@gmail.com.
authors.forename: Jianbin
authors.initials: J
authors.lastname: Guo
authors.affiliation: Department of Environmental Engineering, School of Environment, Tsinghua University, Beijing 100084, PR China.
authors.forename: Wei
authors.initials: W
authors.lastname: Wang
authors.affiliation: Department of Environmental Engineering, School of Environment, Tsinghua University, Beijing 100084, PR China.
authors.forename: Xiao
authors.initials: X
authors.lastname: Liu
authors.affiliation: Department of Environmental Engineering, School of Environment, Tsinghua University, Beijing 100084, PR China.
authors.forename: Songjian
authors.initials: S
authors.lastname: Lian
authors.affiliation: Department of Environmental Engineering, School of Environment, Tsinghua University, Beijing 100084, PR China.
authors.forename: Lei
authors.initials: L
authors.lastname: Zheng
mesh_terms: D000693:Anaerobiosis; D001673:Biodegradation, Environmental; D019149:Bioreactors; D005232:Fatty Acids, Volatile; D005502:Food; D005638:Fruit; D005735:Garbage; D006358:Hot Temperature; D008697:Methane / Q000032:analysis*; D012722:Sewage / Q000737:chemistry*; D014675:Vegetables
chemical_list: D005232:Fatty Acids, Volatile; D012722:Sewage; D008697:Methane
keywords: Anaerobic co-digestion; Dewatered activated sludge; Municipal solid waste (MSW); Thermal pretreatment