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Hydrothermale Carbonisierung des Gärrestes aus dem Biogasreaktor

Jan Mumme1
1 APECS Nachwuchsgruppe, Leibniz-Institut für Agrartechnik Potsdam-Bornim

V 3.3 in Biochar-Technologien

09.07.2010, 09:35-09:55, H 8, GEO

 Jan Mummea*, Mamadou Diakité, Jürgen Kerna, Fabian Ruppa, Lion Eckervogta, Judith PielertbaLeibniz Institute for Agricultural Engineering Potsdam-Bornim e.V., 14469 Potsdam,
 Max-Eyth-Allee 100, GermanybDepartment of Soil Science, Technische Universität Berlin, 10687 Berlin, Salzufer 11-12, Germany E-mail: corresponding.author: jmumme@atb-potsdam.de

Fermentation residues from anaerobic digestion are an abundant source of biomass.
High concentrations of minerals and water, however, are limiting their use to a few applications. Therefore, the aim of this study was to investigate the feasibility of HTC for converting these wastes to biochar. For comparison purposes, also the microcrystalline cellulose Avicel PH-101 (Fluka) was tested.The experiments were carried out in a 1 L stirred batch reactor (Parr, USA) using distilled water as process medium. The fermentation residue was obtained from a laboratory digester using maize silage as a sole substrate. All Materials were processed at temperatures of 190, 230 and 270°C. All experiments were started at pH 5 (after addition of citric acid) and operated with a retention time of 2, 6 and 10 h. The reactor’s initial TS concentration of Avicel and fermentation residue was 97 g/L and 73 g/L, respectively. The first results indicate that fermentation residues are a suitable material for HTC. The required optimization effort, however, appear considerably higher than that for Avicel. Hydrothermal carbonization of residues from anaerobic digestion is part of the APECS (Anaerobic Pathways to Renewable Energies and Carbon Sinks) subproject “biochar”. APECS is a joint project of ATB and Technische Universität Berlin coordinated by Dr. Jan Mumme at the Leibniz Institute for Agricultural Engineering Potsdam-Bornim (ATB).The aim of this project is to develop and investigate a hybrid system for the combined production of biomethane and biochar. Biomethane is a highly versatile energy source, whereas biochar can be applied to the soil as fertiliser and for long term carbon storage.The concept is based on the optimal use of different biomass components: organic matter available to anaerobic digestion is converted to biomethane, whereas recalcitrant organic matter is turned into biochar. Both, biochar and mineral are used for the production of an inert soil additive.The purpose of the study of biochar is the optimization of the thermochemical conversion of fermentation residues to biochar and its refining to a selective adsorbent and an effective soil additive and smart process integration.

Letzte Änderung 21.06.2010