title: The effects of pre-aeration and inoculation on solid-state anaerobic digestion of rice straw.
abstract: Pre-aeration was investigated for enhancing biodegradation of recalcitrant lignocellulosic structure of rice straw under various low temperatures regimes (25, 35 and 45°C) and aeration durations (0, 2, 4, 6 and 8days). It was demonstrated aerated rice straw for 2days at 35°C resulted in highest hydrolytic efficiency and biochemical methane potential (BMP) (355.3±18.7mlCH4/gVS). Furthermore, both methane yields and initiation speeds of the solid-state anaerobic digestion (SS-AD) were inversely proportional to substrate-to-inoculum ratios due to the accumulation of volatile fatty acids (VFAs) and poor mass transfer. The highest methane yield achieved under SS-AD was 234mlCH4/gVS at TS of 16% which 72% of the BMP. Inoculum dilution with recycled water improved buffering capacity and mitigated accumulation of VFAs, resulting in an improved SS-AD performance. The combined pre-aeration and SS-AD was therefore established as a viable option to accelerate methane production for lignocellulosic biomass.
authors.affiliation: Department of Biotechnology, Lund University, Naturvetarvägen 14, SE-223 62 Lund, Sweden; Nova Skantek Environmental Technology (Beijing) Co., Ltd, Beijing 100027, China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Zhou
authors.affiliation: Department of Biotechnology, Lund University, Naturvetarvägen 14, SE-223 62 Lund, Sweden; Nova Skantek Environmental Technology (Beijing) Co., Ltd, Beijing 100027, China. Electronic address: chao_h.li@biotek.lu.se.
authors.forename: Chao
authors.initials: C
authors.lastname: Li
authors.affiliation: Department of Biotechnology, Lund University, Naturvetarvägen 14, SE-223 62 Lund, Sweden.
authors.forename: Ivo Achu
authors.initials: IA
authors.lastname: Nges
authors.affiliation: Department of Biotechnology, Lund University, Naturvetarvägen 14, SE-223 62 Lund, Sweden; Nova Skantek Environmental Technology (Beijing) Co., Ltd, Beijing 100027, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Liu
mesh_terms: D000693:Anaerobiosis; D001673:Biodegradation, Environmental; D056804:Biofuels; D018533:Biomass; D005232:Fatty Acids, Volatile / Q000032:analysis / Q000378:metabolism; D006868:Hydrolysis; D008697:Methane / Q000096:biosynthesis*; D012275:Oryza / Q000378:metabolism*; D018505:Waste Management / Q000379:methods*; D014867:Water / Q000737:chemistry
chemical_list: D056804:Biofuels; D005232:Fatty Acids, Volatile; D014867:Water; D008697:Methane
keywords: Inoculum concentration; Pre-aeration; Rice straw; Solid-state anaerobic digestion; Substrate to inoculum ratio