Thermal wet oxidation improves anaerobic biodegradability of raw and digested biowaste

被引:88
作者
Lissens, G
Thomsen, AB
De Baere, L
Verstraete, W
Ahring, BK [1 ]
机构
[1] Tech Univ Denmark, BioCentrum, DK-2800 Lyngby, Denmark
[2] Riso Natl Lab, Dept Plant Res, DK-4000 Roskilde, Denmark
[3] Organ Waste Syst, B-9000 Ghent, Belgium
[4] LabMET UGent, B-9000 Ghent, Belgium
关键词
D O I
10.1021/es035092h
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Anaerobic digestion of solid biowaste generally results in relatively low methane yields of 50-60% of the theoretical maximum. Increased methane recovery from organic waste would lead to reduced handling of digested solilds, lower methane emissions to the environment, and higher green energy profits. The objective of this research was to enhance the anaerobic biodegradability and methane yields from different biowastes (food waste, yard waste, and digested biowaste already treated in a full-scale biogas plant (DRANCO, Belgium)) by assessing thermal wet oxidation. The biodegradability of the waste was evaluated by using biochemical methane potential assays and continuous 3-L methane reactors. Wet oxidation temperature and oxygen pressure (T, 185-220 degreesC; O-2 pressure, 0-12 bar; t, 15 min) were varied for their effect on total methane yield and digestion kinetics of digested biowaste. Measured methane yields for raw yard waste, wet oxidized yard waste, raw food waste, and wet oxidized food waste were 345, 685, 536, and 571 mL of CH4/g of volatile suspended solids, respectively. Higher oxygen pressure during wet oxidation of digested biowaste considerably increased the total methane yield and digestion kinetics and permitted lignin utilization during a subsequent second digestion. The increase of the specific methane yield for the full-scale biogas plant by applying thermal wet oxidation was 35-40%, showing that there is still a considerable amount of methane that can be harvested from anaerobic digested biowaste.
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收藏
页码:3418 / 3424
页数:7
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