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Gewählte Master / Diploma Thesis:

Samar Seyedsadr (2017): The Effect of Different Combination of Agricultural Residues on the Quality of HTC Hydro-Char Energy Yield.
Master / Diploma Thesis - Institut für Verfahrens- und Energietechnik (IVET), BOKU-Universität für Bodenkultur, pp 82. UB BOKU obvsg FullText

Data Source: ZID Abstracts
Accumulation of waste and demand of energy are increasing along with population growth.Thus, improving Hydrothermal Carbonization (HTC) is seemed to be a big step towards waste treatment and energy utilization. The present study was performed in order to investigate the effect of different combination of residues. The HTC experiments were carried out with a 1.5L reactor under the same condition of 200ºC and pressure of 15bars, using different combinations of two agricultural residues (AR) and biogas sludge (SD); collected from a farm-based biogas plant. Raw materials were maize and barley silage, as well as anaerobically digested sludge. All substrates successfully carbonized through 8 HTC tests, which were different in type and the fraction of selected inputs. Subsequently, qualities of all samples, were analyzed through elemental and calorific value analysis.As a final analysis, potential germination test were applied on the same samples. The results have shown that over 70% of hydro-chars and liquid were recovered after HTC tests. Moreover, quality of hydro-chars was compared to raw materials. According to this comparison carbon content increased 11.8-14.3%, for sludge the increase was only 1.4 and 13% respectively. An increase found in HHV of other samples between 31-36%. The reduction of O/C atomic ratio of hydro-chars range from 36 to 45% comparing with raw samples, whereas for sludge the reduction was only 5%. Atomic H/C ratio also decreased in a range of 21-30%.Mixture of HTC inputs leads to improved hydro-char properties significantly in comparison to mixtures of hydro-chars produced separately. On the other hand, has been recognized, as a result of germination tests.As a result of germination tests, 90-95% germination rate represents no phytotoxic effect.As a conclusion, quality analysis of hydro-chars produced from maize, barley, biogas sludge and different combinations of them, indicates energetic use of HTC as well as soil amendment role of hydro-chars.

Beurteilende(r): Pfeifer Christoph
1.Mitwirkender: Al Afif Rafat

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