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Gewählte Master / Diploma Thesis:

Bernhard Wlcek (2016): Monitoring eines Durchflussversuches im Betrieb mit Maisstroh aus Steam-Explosion-Vorbehandlung zur Biogasproduktion.
Master / Diploma Thesis - Institut für Landtechnik, BOKU-Universität für Bodenkultur, pp 66. UB BOKU obvsg FullText

Data Source: ZID Abstracts
According to the Renewable Energy Directive 2009/28/EC of the European Council, there is a need to extend the usage of renewable resources for energy production. To avoid conflicts with the production of food or feed, only agricultural residues should be taken for this purpose. Maize is a very important crop worldwide and there is a high potential for harvesting corn stover. Due to its bad attributes regarding combustion, corn stover should rather be used for biogas-production. As corn stover has high amounts of lignocellulose-compounds it is hard to degrade by microorganisms. This makes proper pretreatment necessary, to break these compounds and expose the contained monosaccharides. Different methods of pretreatment are known, and the steam-explosion-pretreatment seems to be promising according to former studies, as it only uses heat, water and no chemicals. During the process, saturated steam, at a temperature between 140 and 260 °C, is applied to the biomass with a pressure between 0.7 – 5 hPa. After a retention time between 2 to 120 minutes, the pressure is suddenly released and the biomass is „shot“ into an expansion tank. During this short period, the expanding water steam cracks the fibre-structure and exposes the contained monosaccharides. The specific methane yield produced in the fermentation process is increased to a certain point, but falls again with further treatment. To observe attributes of steam-exploded corn stover, a continuous fermentation trial was carried out. The organic loading rates of 1/1.5/2.5 and 3.5 kg oTM/(m³·d) were tested under mesophilic (40 °C) and thermophilic (55 °C) conditions. Relevant parameters as the gas-yield, the gas-composition, pH etc. were measured. The master thesis describes the process of fermentation and discusses the differences between the various organic loading rates and between the different process-temperatures.

Beurteilende*r: Gronauer Andreas
1.Mitwirkender: Bauer Alexander

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