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2-stage process for a higher flexibility of biogas-plants

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Oral presentation Session 4: Biogas Processes I

Page | 20

“2-stage process for a higher flexibility of biogas-plants”

Patricia C. BENITO MARTIN1, Manfred GREGER1, Markus SCHLIENZ1*

1

Faculty of Sciences, Technology and Communication, University of Luxemburg, Luxemburg

The increasing part of renewable energy in the electricity production mix with its known fluctuations of wind and photovoltaic plants is leading to an enlarged discrepancy of production and consumption.

Up to now the electricity production of biogas plants is more or less constant but could be used in future more to balance the energy production by using higher biogas storage capacity.

An interesting alternative could be a 2 stage process. The 1st stage is operated at higher loadings and low pH where mainly substrate hydrolysis takes place and relatively small quantities of H2/CO2 gas are produced. The effluent shows high concentrations (total > 10 g

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