title: Effects of feedstock ratio and organic loading rate on the anaerobic mesophilic co-digestion of rice straw and cow manure.
abstract: In order to investigate the effects of feedstock ratio and organic loading rate (OLR) on the anaerobic mesophilic co-digestion of rice straw (RS) and cow manure (CM), batch tests (2.5L) were carried out at volatile solid (VS) ratios of 0:1, 1:2, 1:1, 2:1, and 1:0 (RS/CM), and continuous bench experiments (40 L) were carried out at OLRs of 3.0, 3.6, 4.2, 4.8, 6.0, 8.0, and 12.0 kg VS/(m(3) d) with optimal VS ratio. The optimal VS ratio was found to be 1:1. Stable and efficient co-digestion with average specific biogas production of 383.5L/kg VS and volumetric biogas production rate of 2.30 m(3)/(m(3) d) was obtained at an OLR of 6 kg VS/(m(3) d). Anaerobic co-digestion was severely inhibited by the accumulation of volatile fatty acids instead of ammonia when the OLR was 12 kg VS/(m(3) d). Further, significant foaming was observed at OLR ⩾ 8 kg VS/(m(3) d).
authors.affiliation: Key Laboratory of Environmental and Applied Microbiology, Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Science, Chengdu 610041, China.
authors.forename: Dong
authors.initials: D
authors.lastname: Li
authors.affiliation: Chengdu Zhongke Energy & Environmental Protection CO. LTD, Chengdu 610041, China.
authors.forename: Shengchu
authors.initials: S
authors.lastname: Liu
authors.affiliation: Chengdu Zhongke Energy & Environmental Protection CO. LTD, Chengdu 610041, China.
authors.forename: Li
authors.initials: L
authors.lastname: Mi
authors.affiliation: Key Laboratory of Environmental and Applied Microbiology, Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Science, Chengdu 610041, China.
authors.forename: Zhidong
authors.initials: Z
authors.lastname: Li
authors.affiliation: Key Laboratory of Environmental and Applied Microbiology, Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Science, Chengdu 610041, China.
authors.forename: Yuexiang
authors.initials: Y
authors.lastname: Yuan
authors.affiliation: Key Laboratory of Environmental and Applied Microbiology, Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Science, Chengdu 610041, China.
authors.forename: Zhiying
authors.initials: Z
authors.lastname: Yan
authors.affiliation: Key Laboratory of Environmental and Applied Microbiology, Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Science, Chengdu 610041, China. Electronic address: liuxf@cib.ac.cn.
authors.forename: Xiaofeng
authors.initials: X
authors.lastname: Liu
mesh_terms: D000468:Alkalies / Q000494:pharmacology; D000693:Anaerobiosis / Q000187:drug effects; D000818:Animals; D056804:Biofuels / Q000032:analysis; D057919:Biological Oxygen Demand Analysis; D002417:Cattle; D005232:Fatty Acids, Volatile / Q000032:analysis; D006863:Hydrogen-Ion Concentration; D008372:Manure / Q000032:analysis*; D008697:Methane / Q000096:biosynthesis; D009930:Organic Chemicals / Q000494:pharmacology*; D012275:Oryza / Q000737:chemistry*; D012037:Refuse Disposal / Q000379:methods*; D013696:Temperature; D014835:Volatilization; D014866:Waste Products / Q000032:analysis*
chemical_list: D000468:Alkalies; D056804:Biofuels; D005232:Fatty Acids, Volatile; D008372:Manure; D009930:Organic Chemicals; D014866:Waste Products; D008697:Methane
keywords: Biogas; Co-digestion; Cow manure; Rice straw; Stability