title: Enhanced methane production from Taihu Lake blue algae by anaerobic co-digestion with corn straw in continuous feed digesters.
abstract: Anaerobic digestion of Taihu blue algae was tested in laboratory scale, continuous feed digesters (hydraulic retention time 10 days) at 35°C and various organic loading rates (OLR). The methane production and biomass digestion performed well at OLR below 4.00 gVSL(-1)d(-1) but deteriorated as OLR increased due to the increased ammonia concentration, causing inhibition mainly to acetate and propionate degradation. Supplementing corn straw as co-feedstock significantly improved the digestion performance. The optimal C/N ratio for the co-digestion was 20:1 at OLR of 6.00 gVSL(-1) d(-1). Methane yield of 234 mL CH4 gVS(-1) and methane productivity of 1404 mL CH4 L(-1) d(-1) were achieved with solid removal of 63%. Compared with the algae alone, the methane productivity was increased by 46% with less accumulation of ammonia and fatty acids. The reactor rate-limiting step was acetate and propionate degradation.
authors.affiliation: State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China.
authors.forename: Weizhang
authors.initials: W
authors.lastname: Zhong
authors.forename: Lina
authors.initials: L
authors.lastname: Chi
authors.forename: Yijing
authors.initials: Y
authors.lastname: Luo
authors.forename: Zhongzhi
authors.initials: Z
authors.lastname: Zhang
authors.forename: Zhenjia
authors.initials: Z
authors.lastname: Zhang
authors.forename: Wei-Min
authors.initials: WM
authors.lastname: Wu
mesh_terms: D000693:Anaerobiosis; D001673:Biodegradation, Environmental; D057919:Biological Oxygen Demand Analysis; D018533:Biomass; D019149:Bioreactors / Q000382:microbiology*; D001709:Biotechnology / Q000295:instrumentation* / Q000379:methods*; D002244:Carbon / Q000032:analysis; D002480:Cellulase / Q000378:metabolism; D002681:China; D005232:Fatty Acids, Volatile / Q000032:analysis; D060106:Lakes / Q000382:microbiology*; D008697:Methane / Q000096:biosynthesis*; D046931:Microcystis / Q000378:metabolism*; D009584:Nitrogen / Q000032:analysis; D010100:Oxygen / Q000378:metabolism; D013997:Time Factors; D014866:Waste Products / Q000032:analysis; D003313:Zea mays / Q000737:chemistry*
chemical_list: D005232:Fatty Acids, Volatile; D014866:Waste Products; D002244:Carbon; D002480:Cellulase; D009584:Nitrogen; D008697:Methane; D010100:Oxygen