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Gewählte Master / Diploma Thesis:

Stefan Franz Grün (2021): Einfluss von steam exploded Weizenstroh und Hühnertrockenkot auf den Gasertrag und die Prozessstabilität flexibler Biogasanlagen.
Master / Diploma Thesis - Institut für Landtechnik, BOKU-Universität für Bodenkultur, pp 78. UB BOKU obvsg

Data Source: ZID Abstracts
Abstract:
The disconnection of the German-Austrian power grid and the expansion of renewable energy sources, especially wind power and photovoltaics, require additional capacity at regulating and storage power plants. These are necessary in order to be able to balance their productivity in the event of power demand and power surplus so that there is no grid overload. Discontinuous feeding of flexible biogas plants offers the possibility to act as regulating and storage power plants in the power grid. This paper is dedicated to the effects of different discontinuous feeding variants (1, 2, 3 as well as 9 feedings within nine hours) on daily biogas yield and methane content as well as process stability. A mixture of 90% steam exploded wheat straw and 10% dry chicken manure was used as substrate. During the experiment, some correlations between the parameters became clear. The level of biogas yields is highly dependent on the FOS/TAC value. Splitting the feeding interval (2x and 3x feeding) results in an increase in biogas and methane yields compared to 1x feeding. Too many feeding intervals (9x feedings) had decreased the biogas yield by 10% compared to a 1x feeding. Regarding process stability, signs of acidification became apparent due to increasing FOS/TAC values. This resulted from an excessive difference between input and output within each digester. The pH values fluctuated between 7.5 and 7.7 during the evaluation period. However, if the operation had remained constant, there would have been a drop in pH values due to the increasing FOS/TAC values. An increase in the nitrogen content of the substrate could not be detected.

Beurteilende(r): Gronauer Andreas
1.Mitwirkender: Bauer Alexander

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