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Gewählte Master / Diploma Thesis:

Thomas Wagner (2011): Biogaserzeugnung aus Hühnerkot - Einfluss der Steam Explosion Vorbehandlung und Stickstoffabtrennung auf die Gasausbeute.
Master / Diploma Thesis - Institut für Landtechnik, BOKU-Universität für Bodenkultur, pp 86 Seiten. UB BOKU obvsg

Data Source: ZID Abstracts
Animal husbandry produces large amounts of manure. These residuals often cause problems and the possibilities to utilize them are limited. The risk of environmental problems is especially high with chicken manures, because they contain high shares of nitrogen, in particular ammonium nitrogen. During storage of chicken manure, ammonia may be formed. This gas has negative effects when exposed to humans and to the environment and also on the anaerobic fermentation process. The aims of this work were to • condition chicken manure with a suitable procedure to remove the ammonium nitrogen (ammonium stripping). • energetically utilise the differently treated chicken manure through anaerobic fermentation. • determine the influence of the treatment of chicken manure with steam explo-sion on the specific biogas yields in the batch- and continuous fermentation tests as well as on the ammonium stripping. The pretreatment of chicken manure with steam explosion delivered no clear results. The ammonium stripping tests and also the continuous fermentation tests with the stripped chicken manure, delivered more explicit results. Analyses of the stripped chicken manure showed, that within five hours of constant stripping, 2/3 of the ammonium nitrogen could be removed. Although a pre-treatment with steam explosion had no influence on the absolute removal rates, the speed of the ammonium removal was increased in the early stages of the test. In the continuous fermentation tests, in which the stripped as well as the untreated chicken manure was fermented, a significant influence of the ammonium nitrogen removal on the biogas yields could be measured. A reduction of the ammonium content of about 65% lead to an increase of the biogas yield in the range of 17%. According to these results, a pretreatment of nitrogen-containing substrates like chicken manure with the stripping procedure can be recommended. This pretreatment should be done before the anaerobic fermentation. In addition a pretreatment of the substrate with steam explosion can be considered, especially when a pasteurization of the substrate would be done anyway. When done before the stripping procedure, synergy effects, concerning the speed of ammonium removal, may occur.

Beurteilende(r): Amon Thomas

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