Paper details

Title:

Hydrolytic Enzymes within the Process of Biogas Production

Author(s):

Kretzschmar, J., Mueller, L.

Document(s):

Abstract:

The aim of the study was to analyse the performance of different hydrolytic enzymes towards improved gas production in one stage lab scale fermenters and towards lowered viscosity. Therefore different hydrolytic enzymes were added to semi continuous fermenters (CSTR) fed with barley silage in combination with cow manure (V=15 l, HRT: 60 d, OLR: 3.0 gVS/l*d¬1, daily enzyme addition) and to fermenters fed with maize silage (V= 20 l, HRT 90 d, OLR: 3.5 gVS/l*d¬1, weekly enzyme addition). Viscosity lowering effects should be observed by measuring the torque at the agitators in 15 l fermenters. Secondly, digestate and fermenter content of a biogas plant was incubated for 48h at ~40°C without stirring. After incubation the viscosity was measured with an efflux viscometer. Only slight increases in biogas production and in case of high enzyme dosage slight increases in specific biogas production could be observed. The results for viscosity measurement are quite the same. In fermenters we could not detect a decrease in viscosity. The batch tests showed only partial and very low viscosity reduction. It is assumed that the used enzymes were inhibited either by the operating parameters in the system (e.g. pH¬value) and/or by microbial degradation.

Keywords:

bioenergy, efficiency, enzymatic hydrolysis, digestion

Topic:

R&D on Biomass Conversion Technologies for Heating, Electricity and Chemicals

Subtopic:

Anaerobic digestion for biogas production

Event:

20th European Biomass Conference and Exhibition

Session:

2AO.4.1

Pages:

679 - 682

ISBN:

978-88-89407-54-7

Paper DOI:

10.5071/20thEUBCE2012-2AO.4.1

Price:

FREE