Thermophilic anaerobic digestion of cattle manure and improving the hydrolysis yield Christel Kampman a, Tisse Jarlsvik b, Ulf Martinsson b, Susanna Petersson.

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Thermophilic anaerobic digestion of cattle manure and improving the hydrolysis yield Christel Kampman a, Tisse Jarlsvik b, Ulf Martinsson b, Susanna Petersson b, Maurizio Bettiga a a. Industrial Biotechnology, Department of Chemical and Biological Engineering, Chalmers University of Technology, Gothenburg b. Göteborg Energi, Box 53, Gothenburg Christel Kampman a, Tisse Jarlsvik b, Ulf Martinsson b, Susanna Petersson b, Maurizio Bettiga a a. Industrial Biotechnology, Department of Chemical and Biological Engineering, Chalmers University of Technology, Gothenburg b. Göteborg Energi, Box 53, Gothenburg Contact information Christel Kampman Tel.: +46 (0) Maurizio Bettiga Tel.: +46 (0) Seghezzo, L., Zeeman, G., Van Lier, J. B., Hamelers, H. V. M., Lettinga, G. (1998) A review: the anaerobic treatment of sewage in UASB and EGSB reactors. Bioresource Technology. 65 (3), 175 – Ward, A. J., Hobbs, P. J., Holliman, P. J., Jones, D. L. (2008) Optimisation of the anaerobic digestion of agricultural resources. Bioresource Technology. 99 (17), Angelidaki, I. and Ahring, B.K. (2000) Methods for increasing the biogas potential from the recalcitrant organic matter contained in manure. Water Science and Technology. 41 (3), Demirel, B. and Scherer, P. (2011) Trace element requirements of agricultural biogas digesters during biological conversion of renewable biomass to methane. Biomass & Bioenergy. 35 (3), Research objectives Optimization of thermophilic anaerobic digestion of cattle manure Increase the biogas production based on a deeper understanding of the microbial metabolism Figure 2: Thermophilic anaerobic digester (Sävsjö); source of inoculum and substrate for the present research. Process steps 1.Storage (3 d at ambient temperature; not in picture) 2.Hygienization (1 h at 70 °C; not in picture) 3.Anaerobic digestion in a continuously fed stirred tank reactor (25 d at 52 °C) 4.Post-digestion/storage (46 °C) 5.Biogas upgrading to automotive fuel Figure 1: Dairy cow stable with saw dust bedding material. Background Due to global warming and the depletion of fossil fuels, there is a trend towards renewable energy sources, such as solar power, bio-ethanol and biogas Anaerobic digestion is an established technology for: waste management energy recovery as biogas [1, 2] Although a proven technology, research is required to increase biogas yields and productivity Hydrolysis of lignocellulosic material is expected to be the (rate-)limiting step [3] Expected outcome Hydrolysis of lignocellulosic material is (rate-)limiting Increased biogas yield and productivity as a result of an improved insight in the microbial community, esp. the organisms responsible for hydrolysis of lignocellulosic material Research directions Characterize the substrate and the changes it undergoes during thermophilic anaerobic digestion: What fraction of the lignocellulosic material is hydrolysed? What are the ratios cellulose : hemicellulose : lignin before and after digestion? Does lignin inhibit cellulase activity? Can organisms producing hydrolytic enzymes, and thereby their enzyme excretion, be stimulated by: adjusting micro and macro nutrient availability [4] addition of other substrates selection of process conditions Can hydrolysis be enhanced by addition of enzymes?