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| Registros recuperados: 11 | |
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| Kádár, Zsófia; Christensen, Anne Deen; Thomsen, Mette Hedegaard; Bjerre, Anne Belinda. |
| In organic farming, there is a strong effort to minimize the share of non-renewable resources (e.g. fossil fuels) and use only (preferably on-farm produced) bio-based energy and renewable raw materials, with the aim of achieving sustainable production systems and to become self-sufficient in energy. Throughout our studies, wheat and rye grain was used as raw material in bioethanol production with the purpose of producing in situ enzymes (during germination) for the hydrolysis of starch in the grains and compared with commercial amylase enzyme preparations. Whey permeate was incorporated into the grain in Simultaneous Saccharification and Fermentation (SSF) process to use a cheap nutrient and water source. The ethanol fermentations were completed by 190... |
| Tipo: Journal paper |
Palavras-chave: Post harvest management and techniques. |
| Ano: 2011 |
URL: http://orgprints.org/19010/1/JFUE_5339[1].pdf |
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| Petersson, Anneli; Thomsen, Mette Hedegaard; Hauggaard-Nielsen, Henrik; Thomsen, Anne Belinda. |
| To meet the increasing need for bioenergy several raw materials have to be considered for the production of e.g. bioethanol and biogas.In this study, three lignocellulosic raw materials were studied, i.e. (1) winter rye straw (Secale cereale L), (2) oilseed rape straw (Brassica napus L.) and (3) faba bean straw (Viciafaba L.). Their composition with regard to cellulose, hemicellulose, lignin, extractives and ash was evaluated, as well as their potential as raw materials for ethanol and biogas production. The materials were pretreated by wet oxidation using parameters previously found to be optimal for pretreatment of corn stover (195 1C, 15 min, 2 g l_1 Na2CO3 and 12 bar oxygen). It was shown that pretreatment was necessary for ethanol production from all... |
| Tipo: Journal paper |
Palavras-chave: Farming Systems Recycling; Balancing and resource management Crop husbandry. |
| Ano: 2007 |
URL: http://orgprints.org/18980/4/18980.pdf |
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| Kádár, Zsófia; Christensen, Anne Deen; Thomsen, Mette Hedegaard; Thomsen, Anne Belinda. |
| The malting in brewing process develops enzymes that are required to hydrolyze the complex starch in grain into simple fermentable sugars. These proceed the three following steps: Steeping encourages germination to start, germination prepares the conversion of the starch to sugars, and kilning stops the germination. In this study, a method for bioethanol production from rye grain was developed by utilizing the inherent amylase activity from germination of the seed. Grain germination was performed in two steps (steeping, germination) under different conditions, where the effect of temperature, duration and humidity was examined on amylase activity and final ethanol yield. Commercial enzymes were used for reference experiments. Simultaneous... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Post harvest management and techniques. |
| Ano: 2009 |
URL: http://orgprints.org/19026/2/19026.pdf |
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| Christensen, Anne Deen; Kádár, Zsófia; Oleskowicz-Popiel, Piotr; Thomsen, Mette Hedegaard. |
| Ethanol production by K. marxianus in whey from organic cheese production was examined in batch and continuous mode. The results showed that no pasteurization or freezing of the whey was necessary and that K. marxianus was able to compete with the lactic acid bacteria added during cheese production. The results also showed that, even though some lactic acid fermentation had taken place prior to ethanol fermentation, K. marxianus was able to take over and produce ethanol from the remaining lactose, since a significant amount of lactic acid was not produced (1–2 g/l). Batch fermentations showed high ethanol yield (*0.50 g ethanol/g lactose) at both 30ºC and 40ºC using low pH (4.5) or no pH control. Continuous fermentation of nonsterilized whey was performed... |
| Tipo: Journal paper |
Palavras-chave: Post harvest management and techniques. |
| Ano: 2010 |
URL: http://orgprints.org/19014/4/19014.pdf |
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| Thomsen, Mette Hedegaard; Hauggaard-Nielsen, Henrik. |
| To obtain the best possible net energy balance of the bioethanol production the biomass raw materials used need to be produced with limited use of non-renewable fossil fuels. Intercropping strategies are known to maximize growth and productivity by including more than one species in the crop stand, very often with legumes as one of the components. In the present study clover-grass is undersown in a traditional wheat crop. Thereby, it is possible to increase input of symbiotic fixation of atmospheric nitrogen into the cropping systems and reduce the need for fertilizer applications. Furthermore, when using such wheat and clover-grass mixtures as raw material, addition of urea and other fermentation nutrients produced from fossil fuels can be reduced in the... |
| Tipo: Journal paper |
Palavras-chave: Farming Systems Recycling; Balancing and resource management Crop husbandry. |
| Ano: 2008 |
URL: http://orgprints.org/18981/4/18981.pdf |
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| Oleskowicz-Popiel, Piotr; Thomsen, Mette Hedegaard; Thomsen, Anne Belinda; Schmidt, Jens Ejbye. |
| In order to evaluate new strategies for the production of renewable energy within sustainable organic agriculture, a process-simulation model for a 100 ha organic farm was developed. Data used for the model was obtained from laboratory trials, literature data, consultancy with experts, and results from the BioConcens project (http://www.bioconcens.elr.dk). Different design approaches were evaluated in order to establish the most suitable configuration. Rye grains, clover grass silage, maize silage, whey and cattle manure were selected as raw materials for co-production of fuels, feed and fertilizer at the organic farm, based on the fact that crops grown in organic agriculture act as key carbon sources whereas manure and whey were applied primarily as the... |
| Tipo: Journal paper |
Palavras-chave: Technology assessment; Post harvest management and techniques. |
| Ano: 2009 |
URL: http://orgprints.org/19015/4/19015.pdf |
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| Hauggaard-Nielsen, Henrik; Thomsen, Mette Hedegaard; Petersson, Anneli; van Maarschalkerweerd, Christian; Nielsen, Lars Henrik; Thomsen, Anne Belinda; Jensen, Erik Steen. |
| It is very much debated whether bioethanol is a sustainable energy resource that can offer environmental and long-term economic advantages over fossil fuels, like gasoline or die-sel. From the present first generation bioethanol technology focusing on starch (from grain) fermentation GHG savings are only modest. The Danish Integrated Biomass Utili-sation System (IBUS) has developed both first generation and second generation princi-pal bioethanol technologies characterised by integration with an existing coal-fired Com-bined Heat and Power (CBH) plant. To secure that bioenergy is produced from local adapted raw materials with limited use of non-renewable fossil fuels there is a need for integrating the biomass starting point into the energy manufacturing... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Environmental aspects; Greenhouses and coverings; Air and water emissions. |
| Ano: 2007 |
URL: http://orgprints.org/16234/2/16234.pdf |
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| Registros recuperados: 11 | |
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