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ePaper created 2013-09-24, 11:56:35 | version 1.25.20
119 Dr. Yasemin Sterr Phone +49 711 970-4116 yasemin.sterr@igb.fraunhofer.de Prof. Dr. Dieter Bryniok Phone +49 711 970-4211 dieter.bryniok@igb.fraunhofer.de References [1] Fachagentur Nachwachsende Rohstoffe e. V., FNR (2009) Handreichung Biogasgewinnung und -nutzung [2] De Lemos Chernicharo, C. A. (2007) Anaerobic Reactors, IWA Publisher Funding We would like to thank the German Federal Ministry of Educa- tion and Research (BMBF) for funding the project “Full energetic and material utilization of crop plants, lignin separation, fermen- tation and partial oxidation; sub-project: investigations on biogas production from renewable resources”, promotional reference 03SF0362A. Project partners Fraunhofer ICT, Pfinztal | Leibniz Institute for Catalysis at the University of Rostock (LIKAT), Rostock | Hüttenes-Albertus Chemische Werke GmbH, Düsseldorf | Hölle & Hüttner AG, Tübingen | Johann Dudek Maschinenbau, Berlin | SLP GmbH, Wurmannsquick | BL1 GmbH Lichtenau, Lichtenau cycles, all substrates were converted into biogas within 7 days at stable pH values and fatty acid concentrations. In addition, the chemical oxygene demand (COD) was reduced. Nutrients important for the digestion process such as NH4 + -N and PO4 3- -P were present in sufficient concentrations in the reactor throughout the whole fermentation. With sorghum silage from which the lignin had been extract- ed, a higher biogas yield of approx. 800–850 NmL (norm mil- liliters)/g total volatile solids (TVS) (Fig. 3) was achieved com- pared with maize and forage rye silage from which the lignin had been extracted. As a general principle, the substrates without lignin showed a greater biogas yield (Fig. 4: 800–850 vs. 430–680 NmL/g TVS) because of the expanded lignocel- lulose structure. The mechanically ground substrates showed, in general, a higher production of biogas compared with un- ground substrates. Only for sorghum silage was this not ob- served. Here we assume that components are released that impair the biogas process. Outlook Extraction of lignin taking place before the biogas production represents a very promising increase in the biogas yield with simultaneous creation of value of the raw material lignin as a starting material for the chemical industry. Lignin is an ad- equate substitute for phenol in the production of resins, for example. Following on from the project, it is intended that the technical results be transferred to an industrial scale in order to enable, in the medium term, the series production of facili- ties for lignin preparation, biogas production and utilization. 1 Double-walled 1-liter laboratory biogas reactors for monitoring anaerobic degradation. 2 Used substrates. 3 Specific biogas production for substrates with lignin extracted. 4 Specific biogas production of sorghum silage. 3 4 Specificbiogasproduction [Nml/gTVS] Time [d] 400 200 300 500 0 50 10 15 2520 800 900 600 700 1000 100 Lignin-extracted maize silage Lignin-extracted forage silage Lignin-extracted sorghum silage Specificbiogasproduction [Nml/gTVS] Time [d] 400 200 300 500 0 5 10 15 2520 800 900 600 700 1000 100 Unground sorghum silage Ground sorghum silage Lignin-extracted sorghum silage 0 Contacts