Aeration to Improve Biogas Production by Recalcitrant Feedstock

被引:12
作者
Loughrin, John [1 ]
Lovanh, Nanh [1 ]
机构
[1] ARS, USDA, Food Anim Environm Syst Res Unit, 2413 Nashville Rd,Suite B5, Bowling Green, KY 42101 USA
关键词
anaerobic digestion; bioenergy; biogas; carbon dioxide; methane; micro-aeration; MICRO-AERATION; CELLULOSE DEGRADATION; ANAEROBIC-DIGESTION; MICROAERATION; HYDROGEN; HYDROLYSIS; BACTERIA; LITTER;
D O I
10.3390/environments6040044
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Digestion of wastes to produce biogas is complicated by poor degradation of feedstocks. Research has shown that waste digestion can be enhanced by the addition of low levels of aeration without harming the microbes responsible for methane production. This research has been done at small scales and without provision to retain the aeration in the digestate. In this paper, low levels of aeration were provided to poultry litter slurry through a sub-surface manifold that retained air in the sludge. Digestate (133 L) was supplied 0, 200, 800, or 2000 mL/day air in 200 mL increments throughout the day via a manifold with a volume of 380 mL. Digesters were fed 400 g of poultry litter once weekly until day 84 and then 600 g thereafter. Aeration at 200 and 800 mL/day increased biogas production by 14 and 73% compared to anaerobic digestion while aeration at 2000 mL/day decreased biogas production by 19%. Biogas quality was similar in all digesters albeit carbon dioxide and methane were lowest in the 2000 mL/day treatment. Increasing feed to 600 g/week decreased gas production without affecting biogas quality. Degradation of wood disks placed within the digesters was enhanced by aeration.
引用
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页数:10
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