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Gewählte Master / Diploma Thesis:

Klaus Mikula (2019): Biokohleproduktion in Österreich und Chile - Markt, Technologie, Potentiale und Komponentencharakterisierung bei der Pyrolyse von Haselnuss- und Sonnenblumenschalen.
Master / Diploma Thesis - Institut für Verfahrens- und Energietechnik (IVET), BOKU-Universität für Bodenkultur, pp 103. UB BOKU obvsg FullText

Data Source: ZID Abstracts
The main topic of this work is the thermo-chemical conversion process pyrolysis and the related production of biochar, especially for the use as soil amendment. In the beginning the most important principles of dry thermo-chemical conversion processes are explained and an overview over pyrolysis technology, as well as product properties and possible fields of application are presented.In order to be able to estimate potentials in that field, an examination of the biochar production market is carried out, while the main focus is on Austria and Germany.Internet research and one-on-one expert interviews, as well as mail and phone consultations are carried out.Based on this analysis sunflower husks (SFS) are proposed as feedstock material for Austria and hazelnut shells (HNS) for Chile. In order to test these materials for their suitability for the biochar production, a screw reactor in pilot scale is used for producing the char in Austria, while a fixed bed reactor in laboratory scale and a rotary kiln in pilot scale are used in Chile to produce biochar and biooil at different temperatures. In an ultimate analysis the chemical composition of the biochar samples is determined and by identifying the corresponding positions in a van-Krevelen diagram it is found that all biochar samples produced at 400 °C or higher are stable enough for the use as soil amendment. In the fixed bed reactor, it is also shown that rising temperatures decrease the fraction of biochar in the product distribution, while the carbon content of the char is increased. The same behaviour is found with the sunflower hulls in the screw reactor.Also, the bio oil samples produced in the experiments with the fixed bed reactor are analysed in a GC/MS and the occurring components are sorted by frequency in the different samples.The production of biochar using SBS and HNS is very promising for the purpose of soil amendment, but it is advised to ensure the meeting of all EBC (2012) thresholds.

Beurteilende(r): Pfeifer Christoph

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