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Gewählte Doctoral Thesis:

Katharina Hopfner-Sixt (2005): Analyse von Leistungsfähigkeit, Wirtschaftlichkeit und Entwicklungsperspektiven landwirtschaftlicher Biogasanlagen.
Doctoral Thesis, BOKU-Universität für Bodenkultur. UB BOKU obvsg

Data Source: ZID Abstracts
The aim of this project was to investigate the technology and technique parts of agricultural biogas plants in Austria. Literature survey was also integral part with the purpose of revealing the present facts about biogas production and usage. Special attention was given for gathering data about future technologies that could improve nowdays biogas production. With the implementation of the law ¿Ökostromgesetz¿, since 1. january 2003 significante increasement of biogas plants investments have appeared. During the same period new technologies have been developed and adapted according to new substrates used in biogas plants. Important part of the investigation were technical visits to 11 austrian biogas plants with tendence to clearefy technical and technological situation. After field monitoring the collected data were compaired with the actual literature information, which formed prediction of optimising potential and future trends that could be implemented. The following parameters were assessed: technology, substance and energy flows, economic efficiency, work requirement, and management. The results expressed on one side dimensions and technical data of biogas plants and on the other side necessity for operating instructions, scientific development and optimisation of biogas technologies. The market tendency leaded to a many different technical solutions, but most of them were not adopted to practice till now. With regard to the technical aspects of biogas plants, two-phase plants with mesophilic complete mix digesters have prevailed. For direct charging of solid part of energy crobs, flushing systems were applied, which lead to a intermittently charging of the substrates and high odorous emissions. Inside the digester in most cases there is an vertical adjustable agitator, which was often the cause of breakdown. The average hydraulic retention time inside the digester was, depending on the substrate, between 60 and 120 days. The analysis of economic efficiency showed a close correlation betrween the installed capacity and the investment costs. The investment costs per unit decreased. The average need of working hours for biogas plants with only agricultural substrates was 1 ¿ 1,5 hours per day.

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