Abstract
The article presents the results of biogas production from municipal and agricultural waste. The mesophilic digestion of feedstocks was evaluated. Fermentation process was performed according to the DIN 38414-S8. Five types of agricultural waste were used for the research: 100% maize silage, 25% apple pomace – 75% maize silage, 50% apple pomace – 50% maize silage, 75% apple pomace – 25% maize silage and under – size fraction of municipal waste from the sorting drum. Fermentation of waste was carried out for 30 days. In the produced biogas, there were measured the content of: CH4, CO2, O2 and the total yield of biogas. The combination of different groups of waste in the fermentation process causes a higher efficiency of biogas production. Additionally thermal analysis (TG, DSC) of biogas digestate were conducted. Due to the impurities present in the biogas digestate derived from municipal waste, it becomes impossible to use it as fertilizer in agriculture.
Highlights
Biogas is formed during anaerobic fermentation of organic wastes from agricultural, industrial and municipal waste
Biogas can be directly used by combustion in Combined Heat and Power units (CHP).After reprocessing to natural gas quality biogas can be compressed to CBG (Compressed Bio Gas) and liquefied to LBG (Liquid Bio Gas)
Due to the fact that the fermentation of maize silage generates large amounts of biogas with a high methane content, it is widely used as a feedstock in biogas plants
Summary
Biogas is formed during anaerobic fermentation of organic wastes from agricultural, industrial and municipal waste. The fermentation of organic feedstock produces a biogas and digestate. Biogas can be directly used by combustion in Combined Heat and Power units (CHP).After reprocessing to natural gas quality biogas can be compressed to CBG (Compressed Bio Gas) and liquefied to LBG (Liquid Bio Gas). These are ideal fuels for cars, buses and trucks, especially in urban areas, because they produce virtually no particulate matter or NOx emissions. The utilization of digestate may be an additional activity of a biogas plant
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