Published in Scientific Bulletin. Series F. Biotechnologies, Vol. XIX
Written by Cristinel POPESCU, Horia BARDEANU, Stefana JURCOANE
Many biogas systems are too small to handle the available supply of substrates. Knowing the quality and retention time at which maximum methane is produced will help in selecting the mixture of best substrates during co-digestion. In such manner, there will be no need for any increment of infrastructure to raise the capacity of a Biogas plant. The Biogas in an Anaerobic Digestion Plant is produced from different substrates which vary in terms of quantities and quality. Approximately 55% methane and 45% carbon dioxide is issued alongside of other gases which makes difficult the prognoses of methane production for transforming it into electricity and feeding it to grid in order by optimizing the substrates fed on the fermenter. The objective of this study is to assess the variation of methane and carbon dioxide yield with methane production, retention time and different quality substrates in a biogas plant. A good productivity of methane (52,5% by biogas volume) has been obtained from a mixture of corn silage and rye, occurred on the 3rd day of digestion. Additional treatment with 4% fats and 2% leftovers of the total daily feeding substrates produced even higher methane. The production of methane was hindered by the presence of some trace gases as hydrogen sulfide which limited the methane producing bacteria.
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anaerobic digestion
