Silage of the organic fraction of municipal solid waste to improve methane production

被引:5
|
作者
Castellon-Zelaya, Mario F. [1 ]
Gonzalez-Martinez, Simon [1 ]
机构
[1] Univ Nacl Autonoma Mexico, Natl Univ Mexico, Inst Engn, Environm Engn Dept, Mexico City 04510, DF, Mexico
关键词
anaerobic digestion; fermentation; methane production; OFMSW; silage;
D O I
10.2166/wst.2021.148
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The silage of the organic fraction of municipal solid waste (OFMSW) is a common practice in biogas plants. During silage, fermentation processes take place, affecting the later methanisation stage. There are no studies about how OFMSW silage affects methane production. This work aimed to determine the effects of silage (anaerobic acid fermentation) at different solids concentrations and temperatures on methane production. OFMSW was ensiled at 20, 35, and 55 degrees C with total solids (TS) concentrations of 10, 20, and 28% for 15 days. The ensiled OFMSW was then tested for methane production at the substrate to inoculum ratios (S/I) of 0.5, 1.0, and 1.5. Independently of the temperature, the production of the metabolites during silage increases with decreasing solids concentration. The highest metabolites production were lactic acid, ethanol, and acetic acid, representing together 95% of the total. Methane production from ensiled OFMSW at 10% solids concentration shows, under every tested condition, better methane production than from fresh OFMSW. Ensiled OFMSW produces more methane than fresh OFMSW, and methane production was highest at 35 degrees C.
引用
收藏
页码:2536 / 2548
页数:13
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