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Registros recuperados: 7
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Lebensmittel und Energiepflanzen aus biologischem Anbau - unerwünschte oder nachhaltige Möglichkeiten? Organic Eprints
Schäfer, Winfried.
Crop production is a conversion process of sun energy into biomass. Consequently, both the cultivation area and the insolation stroking this area limit the agroenergy output of the globe. Cultivation measures support the photosynthetic conversion process. Although organic cultivation measures require less energy than mainstream agriculture, the overall efficiency remains below 1%. Nevertheless, agroenergy production is captivating with many win-win situations: environmentally neutral bio-fuels replace polluting fossil fuels, farmers get better prices for energy crops, and turnover of power industry grows due to increasing energy consumption to process biomass into fuel. As a following, the state tax income improves too. However, better prices for energy...
Tipo: Conference paper, poster, etc. Palavras-chave: Environmental aspects Indicators and other value-laden measures Farm nutrient management Buildings and machinery Recycling; Balancing and resource management Technology assessment.
Ano: 2008 URL: http://orgprints.org/15430/1/Sch%C3%A4fer_Lednice.pdf
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The role of engineering in organic farming – case energy crops Organic Eprints
Schäfer, Winfried.
Energy self-reliance and a closed nutrient cycle are basic principles of organic farming ever since. Engineering sciences methods in energy accounting may support efforts to introduce these principles into praxis. A method to calculate efficiency of energy crop production including sun energy, direct and indirect energy for cultivation, processing, and conversion into fuel is demonstrated using rape and derived fuels as an example. Every production and conversion step is a process and calculated separately. The overall efficiency includes energy input and output of all processes. The process effi-ciency of rape cultivation reaches in Finland up to 1100%. However, the overall en-ergy efficiency of rape methyl ester (RME) is 1 to 2 ‰ only. The production of...
Tipo: Conference paper, poster, etc. Palavras-chave: Environmental aspects Specific methods Crop husbandry Recycling; Balancing and resource management Technology assessment.
Ano: 2007 URL: http://orgprints.org/9462/1/9462_Sch%C3%A4fer_Vortrag.pdf
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Græs er ægte grøn energi Organic Eprints
Møller, Henrik Bjarne; Nielsen, Lisbeth.
Græs fra engarealer kan mere end fordoble produktionen af biogas, og energibalancen er markant bedre end ved traditionelle landbrugsafgrøder som majs og korn. Samtidig får man fjernet næringsstofferne fra de følsomme områder, og man undgår, at arealerne ender med at blive til skov.
Tipo: Newspaper or magazine article Palavras-chave: Recycling; Balancing and resource management Technology assessment.
Ano: 2008 URL: http://orgprints.org/14415/3/14415.pdf
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Codigestion of manure and organic waste at centralized biogas plants: Process imbalances and limitations Organic Eprints
Nielsen, Henrik Bangsø; Angelidaki, Irini.
The present study focuses on process inhibitions in Danish centralized biogas plants. Collection of data from the plants and a number of interviews showed that inhibitions occur frequently. High concentrations of ammonia, long chain fatty acids or other inhibitory compounds, and foaming in prestorage tanks are well known causes of inhibition. These problems mainly occurs due to: 1) inadequate knowledge about the waste composition and 2) its degradation characteristics, 3) inadequate process surveillance especially with regard to volatile fatty acids and 4) insufficient pre-storage capacity causing inexpedient mixing of the different waste products in the pre-storage tanks.
Tipo: Conference paper, poster, etc. Palavras-chave: Recycling; Balancing and resource management Technology assessment.
Ano: 2008 URL: http://orgprints.org/14519/1/Tunesien_maj_2008.ppt
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Codigestion of manure and organic waste at centralized biogas plants: process imbalances and limitations Organic Eprints
Nielsen, H.B.; Angelidaki, I..
The present study focuses on process inhibitions in Danish centralized biogas plants. Collection of data from the plants and a number of interviews showed that inhibitions occur frequently. High concentrations of ammonia, long chain fatty acids or other inhibitory compounds, and foaming in prestorage tanks are well known causes of inhibition. These problems mainly occurs due to: 1) inadequate knowledge about the waste composition and 2) its degradation characteristics, 3) inadequate process surveillance especially with regard to volatile fatty acids and 4) insufficient pre-storage capacity causing inexpedient mixing of the different waste products in the pre-storage tanks.
Tipo: Journal paper Palavras-chave: Recycling; Balancing and resource management Technology assessment.
Ano: 2008 URL: http://orgprints.org/14404/1/HENRIK_Nielsen_and_Angelidaki%2Dfull__paper[1].pdf
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BioConcens: Biomass and bioenergy production agriculture – consequences for soil fertility, environment, spread of animal parasites and socio-economy Organic Eprints
Oleskowicz-Popiel, P; Ambus, P; Carter, M.S.; Dalgaard, T.; Hauggaard-Nielsen, H; Johansen, A; Jørgensen, U; Nielsen, A.M; Nielsen, H.B.; Nielsen, L.H; Olesen, J.E.; Roepstorff, A; Skytte, K; Schmidt, J.E.; Thomsen, A.B.; Thomsen, M.H.; Jensen, E.S..
The research programme called “international research cooperation and organic integrity” was commenced for a period 2006-2010. It is coordinated by DARCOF (The Danish Research Centre for Organic Farming). The whole programme, with acronym DARCOF III, consists of 15 projects (http://www.darcof.dk/research/darcofiii/index.html). One of them is BIOCONCENS - Biomass and bioenergy production in organic farming – consequences for soil fertility, environment, spread of animal parasites and socio-economy (http://www.bioconcens.elr.dk/uk/). The production of bioenergy in organic agriculture (OA) can reduce its dependency of fossil fuels and decrease green house gasses emission; consequently it will increase sustainability of organic farms. Biorefinery concept based...
Tipo: Conference paper, poster, etc. Palavras-chave: Biodiversity and ecosystem services Recycling; Balancing and resource management Technology assessment.
Ano: 2008 URL: http://orgprints.org/14406/1/poster_Oleskowicz%2Dpopiel.pdf
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Energy and emergy evaluation of potentials for energy self-sufficiency in Danish organic dairy farms by production of biogas and bioethanol Organic Eprints
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
Registros recuperados: 7
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