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Gewählte Publikation:

Stoyanova, E; Forsthuber, B; Pohn, S; Schwarz, C; Fuchs, W; Bochmann, G.
(2014): Reducing the risk of foaming and decreasing viscosity by two-stage anaerobic digestion of sugar beet pressed pulp.
Biodegradation. 2014; 25(2):277-289 FullText FullText_BOKU

Anaerobic digestion (AD) of sugar beet pressed pulp (SBPP) is a promising treatment concept. It produces biogas as a renewable energy source making sugar production more energy efficient and it turns SBPP from a residue into a valuable resource. In this study one- and two-stage mono fermentation at mesophilic conditions in a continuous stirred tank reactor were compared. Also the optimal incubation temperature for the pre-acidification stage was studied. The fastest pre-acidification, with a hydraulic retention time (HRT) of 4 days, occurred at a temperature of 55 A degrees C. In the methanogenic reactor of the two-stage system stable fermentation at loading rate of 7 kg VS/mA(3)A d was demonstrated. No artificial pH adjustment was necessary to maintain optimum levels in both the pre-acidification and the methanogenic reactor. The total HRT of the two-stage AD was 36 days which is considerably lower compared to the one-stage AD (50 days). The frequently observed problem of foaming at high loading rates was less severe in the two-stage reactor. Moreover the viscosity of digestate in the methanogenic stage of the two-stage fermentation was in average tenfold lower than in the one-stage fermentation. This decreases the energy input for the reactor stirring about 80 %. The observed advantages make the two-stage process economically attractive, despite higher investments for a two reactor system.
Autor*innen der BOKU Wien:
Bochmann Günther
Fuchs Werner
Stoyanova Eliza

Find related publications in this database (Keywords)
Two-stage anaerobic digestion
Sugar beet pressed pulp

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