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| Registros recuperados: 16 | |
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| Oleskowicz-Popiel, Piotr. |
| The consumer demand for environmentally friendly, chemical free and healthy products, as well as concern regarding industrial agriculture’s effect on the environment has led to a significant growth of organic farming. On the other hand, organic farmers are becoming interested in direct on‐farm energy production which would lead them to independency from fossil fuels and decrease the greenhouse gas emissions from the farm. In the presented work, the idea of biogas and bioenergy production at the organic farm is investigated. This thesis is devoted to evaluate such a possibility, starting from the characterization of raw materials, through optimizing new processes and solutions and finally evaluating the whole on‐farm biorefinery concept with the help of a... |
| Tipo: Thesis |
Palavras-chave: Technology assessment. |
| Ano: 2010 |
URL: http://orgprints.org/19318/4/19318.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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| 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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| Oleskowicz-Popiel, Piotr; Thomsen , Anne Belinda; Schmidt, Jens Ejbye. |
| Ensiling of humid biomass samples wrapped in plastic bales has been investigated as a wet-storage for bioethanol production from three lignocellulosic biomass samples i.e. maize, rye, and clover grass. During the silage process, lactic acid bacteria fermented free sugars to lactic acid, and consequently by lowing pH, inhibiting other microbes to degrade the polysaccharides. Following silage treatment, enzymatic convertibility tests showed that 51.5%, 36.5%, and 41.9% of the cellulose was converted by cellulytic enzymes in ensiled maize, rye, and clover grass, respectively. In addition, tests of SSF (simultaneous saccharification and fermentation) were carried out using combined enzymatic hydrolysis and fermentation with two different microorganisms... |
| Tipo: Journal paper |
Palavras-chave: Post harvest management and techniques. |
| Ano: 2011 |
URL: http://orgprints.org/19013/4/19013.pdf |
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| Kádár, Zsófia; Christensen , Anne Deen; Oleskowicz-Popiel, Piotr; Heiske, Stefan; Thomsen , Mette Hedegaard; Schmidt, Jens Ejbye. |
| Organic agriculture is one sustainable alternative to avoid negative environmental effects often caused by conventional agriculture. The area for organic farming in Europe is increased rapidly in the last decades and Denmark is one of the top-ten countries in Europe as regards the organic share of the total cultivated area. The production of bioenergy from local biological resources and the maintenance of soil fertility seem to have been opposing aims in organic agriculture. In organic farming, there is a strong effort to reduce the reliance on fossil fuels and decrease greenhouse gas emissions in organic agriculture. Cheese whey is a by-product from the dairy industry, which has the highest market share of organic foods in Denmark. It generates... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Technology assessment; Composting and manuring; Post harvest management and techniques. |
| Ano: 2011 |
URL: http://orgprints.org/19017/2/19017.pdf |
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| Thomsen, Anne Belinda; Arvaniti, Efthalis; Xu, Jian; Oleskowicz-Popiel, Piotr; Frenqvist, Tomas; Schultz-Jensen, Nadja; Kádár, Zsófia; Jensen, Morten; Thomsen, Sune T.; Thygessen, Anders. |
| Pretreatment technologies for production of 2G bioethanol from agricultural waste and crops |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Post harvest management and techniques. |
| Ano: 2010 |
URL: http://orgprints.org/19020/2/19020.pdf |
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| Oleskowicz-Popiel, Piotr; Kádár, Zsófia; Heiske, Stefan; Klein-Marcuschamer , D.; Schmidt, Jens Ejbye. |
| The organic farming community has long been recognized for its environmental awareness and has been seeking ways to reduce greenhouse gas emissions and become energy independent. In that regard, ethanol can substitute a fraction of the gasoline used by farming equipment, whereas biogas can fuel the production of heat and electricity for the farm. We investigated the addition of a biorefinery to an organic farm, where ethanol was produced from germinated rye grains and whey and the effluent was separated into two streams: the protein-rich solid fraction, to be used as animal feed, and the liquid fraction, which can be co-digested with clover grass silage to produce biogas. The effluent from the anaerobic digestion process was assumed to serve as natural... |
| Tipo: Journal paper |
Palavras-chave: Technology assessment; Post harvest management and techniques. |
| Ano: 2011 |
URL: http://orgprints.org/19007/2/19007.pdf |
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| Oleskowicz-Popiel, Piotr; Kádár, Zsófia; Heiske, Stefan; Klein-Marcuschamer , D.; Simmons, Blake A.; Blanch, Harvey W.; Schmidt, Jens Ejbye. |
| The addition of a biorefinery to an organic farm was investigated, where ethanol was produced from germinated rye grains and whey, and the effluent was separated into two streams: the protein-rich solid fraction, to be used as animal feed, and the liquid fraction, which can be co-digested with clover grass silage to produce biogas. A method for ethanol production from rye was applied by utilizing inherent amylase activity from germination of the seed. Biogas potential of ethanol fermentation effluent was measured through anaerobic digestion trials. The effluent from the trials was assumed to serve as natural fertilizer. A technoeconomic analysis was also performed; total capital investment was estimated to be approximately 4 M USD. Setting a methane... |
| Tipo: Journal paper |
Palavras-chave: Technology assessment; Post harvest management and techniques. |
| Ano: 2012 |
URL: http://orgprints.org/20461/4/20461.pdf |
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| Markussen, Mads Ville; Østergård, Hanne; Oleskowicz-Popiel, Piotr; Schmidt, Jens Ejby; Pugesgaard, Siri. |
| One obvious way to enhance agricultural resilience is for farms to increase self-sufficiency with necessities such as fuel, fodder and fertilizer. Our research seeks to uncover these potentials for Danish organic dairy farming. The setting is a theoretical model of a farm-cooperation of 10 farms of 100 ha each producing only milk and animals for slaughtering and being self-sufficient with fodder and fertilizer. The question is if they can be self-sufficient with energy by means of shared biogas and/ or bioethanol production facilities. The method is mapping of energy, emergy (embodied energy measured in solar energy joules) and mass flows in different scenarios, that are based on empirical data from Danish dairy farms concerning mix of crops, crop yields,... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Farming Systems Recycling; Balancing and resource management Technology assessment. |
| Ano: 2009 |
URL: http://orgprints.org/15842/1/15842_Abstract.pdf |
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| Oleskowicz-Popiel, Piotr; Nielsen, Henrik Bangsø; Thomsen, Anne Belinda; Schmidt, Jens Ejbye. |
| The production of bioenergy in organic agriculture (OA) can reduce its dependency on fossil fuels and decrease greenhouse‐gases (GHG) emissions; consequently increasing the sustainability of organic farming. Different biomasses were characterized biologically and chemically for their biogas and bioethanol potential at organic farms in Denmark. Batch experiments indicated methane yield [GJ/ha]: 260.7 (fresh maize), 272.7 (maize silage), 127.1 (fresh rye), 169.7 (rye silage), 161.7 (dried rye), 110.5 (fresh clover), 117.8 (clover silage), 72.3 (dried clover), and 41.1 (dried vetch). Theoretical ethanol yield [GJ/ha] showed: 119.8 (fresh maize), 109.2 (maize silage), 36.9 (fresh rye), 39.9 (rye silage), 84.7 (dried rye), 28.9 (fresh clover), 24.4 (clover... |
| Tipo: Journal paper |
Palavras-chave: Post harvest management and techniques. |
| Ano: 2011 |
URL: http://orgprints.org/19009/4/19009.pdf |
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| Kádár, Zsófia; Oleskowicz-Popiel, Piotr; Schmidt, Jens Ejbye; Thomsen, Anne Belinda. |
| Organic agriculture is one sustainable alternative to avoid the negative environmental effects often caused by conventional agriculture. BioConcens is an interdisciplinary project aims at developing new biorefinery concept and processes for co-production of bioethanol, biogas and animal feed based on resources from organic agriculture (clover grass, straw) and associated food processing (whey). Bioenergy produced in organic agriculture can reduce its dependency of fossil fuels and decrease greenhouse-gas emission, and at the same time it is important that carbon and nutrients cycle are not influenced negatively. Biogas can be produced from any carbon rich waste/by-product, which can be further utilized in combined heat and power plant to produce heat and... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Post harvest management and techniques. |
| Ano: 2009 |
URL: http://orgprints.org/19023/2/19023.pdf |
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| Registros recuperados: 16 | |
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