title: Demand-driven energy supply from stored biowaste for biomethanisation.
abstract: Energy supply is a global hot topic. The social and political pressure forces a higher percentage of energy supplied by renewable resources. The production of renewable energy in form of biomethane can be increased by co-substrates such as municipal biowaste. However, a demand-driven energy production or its storage needs optimisation, the option to store the substrate with its inherent energy is investigated in this study. The calorific content of biowaste was found unchanged after 45 d of storage (19.9±0.19 kJ g(-1) total solids), and the methane yield obtained from stored biowaste was comparable to fresh biowaste or even higher (approx. 400 m(3) Mg(-1) volatile solids). Our results show that the storage supports the hydrolysis of the co-substrate via acidification and production of volatile fatty acids. The data indicate that storage of biowaste is an efficient way to produce bioenergy on demand. This could in strengthen the role of biomethane plants for electricity supply the future.
authors.affiliation: University of Innsbruck, Institute of Infrastructure, Technikerstraße 25d, 6020 Innsbruck, Austria; AlpS - Center for Climate Change Adaptation, Grabenweg 68, 6020 Innsbruck, Austria.
authors.forename: Peter
authors.initials: P
authors.lastname: Aichinger
authors.affiliation: University of Innsbruck, Institute of Microbiology, Technikerstraße 25d, 6020 Innsbruck, Austria.
authors.forename: Martin
authors.initials: M
authors.lastname: Kuprian
authors.affiliation: University of Innsbruck, Institute of Microbiology, Technikerstraße 25d, 6020 Innsbruck, Austria.
authors.forename: Maraike
authors.initials: M
authors.lastname: Probst
authors.affiliation: University of Innsbruck, Institute of Microbiology, Technikerstraße 25d, 6020 Innsbruck, Austria.
authors.forename: Heribert
authors.initials: H
authors.lastname: Insam
authors.affiliation: AlpS - Center for Climate Change Adaptation, Grabenweg 68, 6020 Innsbruck, Austria. Electronic address: Ebner@alps-gmbh.com.
authors.forename: Christian
authors.initials: C
authors.lastname: Ebner
mesh_terms: D019149:Bioreactors; D002245:Carbon Dioxide / Q000737:chemistry; D002627:Chemistry, Physical; D004058:Diffusion; D004560:Electricity; D005232:Fatty Acids, Volatile; D006863:Hydrogen-Ion Concentration; D006868:Hydrolysis; D008697:Methane / Q000096:biosynthesis* / Q000737:chemistry; D012037:Refuse Disposal / Q000379:methods; D059205:Renewable Energy; D012722:Sewage / Q000737:chemistry
chemical_list: D005232:Fatty Acids, Volatile; D012722:Sewage; D002245:Carbon Dioxide; D008697:Methane
keywords: Anaerobic digestion; Biogas; Renewable energy; Sludge; Wastewater treatment