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Gewählte Master / Diploma Thesis:

Nina Wohlfahrt (2019): Optimisation of different pre-treatments for empty fruit bunches for an efficient biogas production.
Master / Diploma Thesis - Institut für Landtechnik, BOKU-Universität für Bodenkultur, pp 64. UB BOKU obvsg

Data Source: ZID Abstracts
Abstract:
The increase in palm oil production leads to negative side effects, such as threats to the environment when discharging the untreated wastewater (POME) formed during the process. Also, Empty Fruit Bunches (EFBs) are not post-processed, but currently mostly stored and later reapplied on the fields. There are lab-scale experiments which show that co-digesting both substrates could be beneficial, but until now research under real-life conditions is missing. In this master thesis 16 different variants with main focus on mechanical and thermal pre-treatment did undergo a batch test according to VDI 4630. The particle size ranged between 1 mm and 20 mm, whereas temperature was applied at 3 different levels (100°C, 120°C & 134°C) for the duration of one and two hours. The methane production of these samples ranged between 208 lN CH4 kg-1 VS (for treatment at 120°C, 1 h and 20 mm) and 268 lN CH4 kg-1 VS (for treatments at 100°C 1 and 2 hours and 134°C at 2 hours all of them at particle size 4 mm), with methane percentage ranging between 57 % and 61 % for all samples. Also, degradation kinetic tests were conducted for 5 samples (all 20 mm) and low thermal pre-treatments. Subsequently an acid hydrolysis and a HPTLC analysis were conducted to obtain information about the evolution of hemicellulose, cellulose and lignin content of the samples. This test was run in parallel to the batch test and showed degradation rates of 60 % - 65 % on average. While an evident degradation of cellulose could be observed, the hemicellulose fraction stayed almost on a constant level and lignin fraction was increased in relative terms. Finally, there was a sedimentation/flotation test conducted in an Imhoff cone for all samples from the degradation kinetics. There was clear tendency of sinking. Further research is recommended to be conducted in pilot-scale digesters to gain more knowledge about the process technological specifics which might appear when using these substrates.

Beurteilende(r): Gronauer Andreas
1.Mitwirkender: Bauer Alexander

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