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Registros recuperados: 139
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A Flexible Inventory Model for MSW Recycling AgEcon
Louis, Garrick; Shih, Jhih-Shyang.
Most of the United States have laws mandating the recycling of municipal solid waste (MSW). In order to comply, municipalities recycle quotas of materials, without regard to fluctuating prices. An inventory system is proposed that allows municipalities to be sensitive to materials prices as they recycle in accordance with state mandates. A dynamic model is developed; it uses historical secondary material prices as exogenous inputs to minimize the net present value of MSW recycling system cost. The model provides a cost-effective method for municipalities to achieve their MSW recycling targets. The savings is approximately $1.43 per ton of MSW generated based on total MSW management costs of $13.5 per ton. The model also allows one to investigate the...
Tipo: Working or Discussion Paper Palavras-chave: Municipal solid waste; Recycling; Inventory; Optimization; Environmental Economics and Policy; Q2.
Ano: 2002 URL: http://purl.umn.edu/10459
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A framework for efficient wastewater treatment and recycling systems AgEcon
Mekala, Gayathri Devi; Davidson, Brian; Samad, Madar; Boland, Anne-Maree.
Use of un-treated/partially treated wastewater for irrigation in the dry countries of Asia and Africa and recycling of treated wastewater in the water scarce developed countries has become a common practice due to various reasons. While the lack of wastewater treatment to appropriate levels before use is a major problem in developing countries, the high cost of wastewater recycling is the major problem in developed countries. The current paper is part of a doctoral research and presents the conceptual framework for the research and the methodology that can be used to tackle the problems associated with wastewater recycling.
Tipo: Working or Discussion Paper Palavras-chave: Water reuse; Wastewater; Recycling; Pricing; Water allocation; Cost benefit analysis; Wastewater irrigation; Developing countries; Developed countries; Case studies; India; Australia; Hyderabad; Melbourne; Agribusiness; Agricultural Finance; Crop Production/Industries; Demand and Price Analysis; Farm Management; Production Economics.
Ano: 2008 URL: http://purl.umn.edu/46387
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A GERAÇÃO DE EXTERNALIDADES E O PROCESSO DE RECICLAGEM: A APLICAÇÃO DA METODOLOGIA DA ANÁLISE DO CICLO DE VIDA COMO FERRAMENTA GERENCIAL AgEcon
Souza, Roberta Fernanda Da Paz De.
A expansão dos níveis de produção perseguidos atualmente com vistas à elevação dos níveis de emprego e renda gerados pela economia e a manutenção dos padrões de consumo demandados pela sociedade fazem com que haja uma crescente pressão sobre os recursos naturais. A análise dos processos e produtos gerados pelas indústrias tornaria viável adoção de medidas capazes de obter resultados mais eficientes. Para possibilitar tais análises, têm sido desenvolvidos diversos conceitos teóricos e métodos que visam a melhoria do processo produtivo. O conceito de externalidades e o método de Análise do Ciclo de Vida (ACV) fazem parte desse arcabouço. A partir de sua aplicação, tornam-se possíveis a adoção de medidas que busquem a utilização sustentável dos recursos...
Tipo: Conference Paper or Presentation Palavras-chave: Externalidades; Análise do Ciclo de Vida; Reciclagem; Externalities; Life Cycle Analysis; Recycling; Resource /Energy Economics and Policy.
Ano: 2008 URL: http://purl.umn.edu/113191
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Abstract Organic Eprints
Kahiluoto, Helena.
This report presents the interdisciplinary synthesis of the multidisciplinary BERAS study: The research questions for the interdisciplinary work were as follows: Do localisation and recycling in rural food systems enhance sustainability, and what are the prerequisites for this?
Tipo: Report chapter Palavras-chave: Recycling; Balancing and resource management.
Ano: 2006 URL: http://orgprints.org/8773/1/BERAS_slutrapport.pdf
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Analyse du cycle de vie d’un biocomposite ArchiMer
Le Duigou, A.; Davies, Peter; Baley, C..
In addition to the impact on climate change resulting from the use of non renewable resources [1], the depletion of existing fossil fuel sources is inevitable. A major change of strategy is required. This article presents an analysis of a Flax fibre/PLLA biocomposite life cycle compared to common glass fibre reinforced polyester composites from manufacturing to mechanical design and end-of-life. Environmental impacts have been assessed by Standardized method called Life Cycle Analysis (ISO 14044). Flax fibre/PLLA biocomposites manufactured by film stacking have, for similar mass, tensile modulus close to that of Glass/Polyester. Besides being compostable at end of life, biocomposites have been proved to be recyclable which makes it possible to keep the...
Tipo: Text Palavras-chave: Biocomposites; Fibres végétales; Recyclage; Analyse de cycle de vie; Biocomposites; Vegetal fibres; Recycling; Life cycle analysis.
Ano: 2010 URL: https://archimer.ifremer.fr/doc/00480/59149/61778.pdf
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Aspectos preliminares da industrialização do lixo da cidade de Belém. Repositório Alice
GUIMARÃES, G. de A.; CONDURU, J. M. P..
1966
Tipo: Outras publicações científicas (ALICE) Palavras-chave: Lixo; Reciclagem; Wastes; Recycling.
Ano: 1966 URL: http://www.alice.cnptia.embrapa.br/handle/doc/375449
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Attitudes towards utilization of composted domestic waste, sludge, urine and faeces as manure in agriculture Organic Eprints
Quitzau, Maj-Britt; Moeller, Jacob; Magid, Jakob.
Workshoppens formål var at få en idé om, hvad der spiller ind på offentlighedens villighed til at acceptere genbrug af komposteret husholdningsaffald, slam og fæces som gødning i landbruget. Tanken var at få en indledende brainstorming og diskussion af holdningerne i samfundet.
Tipo: Report Palavras-chave: Recycling; Balancing and resource management.
Ano: 2004 URL: http://orgprints.org/3407/1/3407.doc
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Auswirkungen der Fermentation biogener Rückstände in Biogasanlagen auf Flächenproduktivität und Umweltverträglichkeit im ökologischen Landbau bei viehloser Wirtschaftsweise Organic Eprints
Stinner, Walter; Möller, Kurt; Leithold, Günter.
Problemstellung/Ziele:Analog zur Entwicklung im konventionellen Landbau ist auch im Ökologischen Landbau eine zunehmende Tendenz zu viehloser Wirtschaftsweise festzustellen. Viehlose Betriebe können auf die Vorteile des Kleegrasanbaues (N-Versorgung, Unkrautbekämpfung) kaum verzichten. Üblicherweise wird der Aufwuchs gemulcht und auf der Fläche belassen, ebenso die übrigen Rest- und Koppelprodukte (Stroh von Getreide und Körnerleguminosen, Zwischenfruchtaufwüchse, u.ä.). Damit können erhebliche N-Verluste verbunden sein, zum Einen als Ammoniakfreisetzungen beim Abbau des Kleegrasmulches (u.a. ANDREN, 1987), zum Anderen durch Minderleistungen der Stickstofffixierung gemulchter Bestände, die mineralisierten Stickstoff aufnehmen und dabei die eigene...
Tipo: Conference paper, poster, etc. Palavras-chave: Recycling; Balancing and resource management Composting and manuring Air and water emissions.
Ano: 2003 URL: http://orgprints.org/4528/1/4528%2Dstinner%2D2003%2Dbiogas.pdf
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Avaliação preliminar de um sistema de irrigação de baixo custo em Assentamentos de Reforma Agrária na Borda Oeste do Pantanal. Repositório Alice
FEIDEN, A.; MALSOLF, T. L.; CONCEIÇÃO, V.; SILVA, A. M. dos S.; BORSATO, A. V.; FEIDEN, A..
Neste trabalho, apresenta-se a avaliação preliminar de um sistema de irrigação que utiliza como aspersor garrafas PET e mangueira preta de polietileno. Como seus materiais são facilmente encontrados e de fácil substituição, sua utilização é indicada para sistemas em transição agroecológica. O sistema foi avaliado em quatro propriedades com o intuito de desenvolver alguns parâmetros técnicos que permitam auxiliar seu dimensionamento, já que até o momento os sistemas são instalados de forma empírica. A pressão estática foi medida com o sistema todo fechado, e a seguir foram acrescentados os aspersores um por um até um total de seis. A cada inclusão, mediu-se a pressão e o raio útil de irrigação do aspersor. A pressão inicial disponível em cada propriedade...
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Agricultura Familiar; Reciclagem; Manejo de água; Convivência com a seca; Family Farming; Water management; Coexistence with drought; Seca; Irrigação; Conventional farming; Recycling; Drought; Family farms.
Ano: 2016 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1050015
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Bærekraftig utmarksmote Organic Eprints
Bergslid, Ildri (Rose) Kristine; Grøva, Lise.
Gjennom fotosyntesen omdannes karbondioksid i lufta til gras. Sauen spiser graset og produserer ull som vi kan bruke til å lage de fineste klær og andre tekstiler.
Tipo: Newspaper or magazine article Palavras-chave: Recycling; Balancing and resource management Sheep and goats Biodiversity and ecosystem services.
Ano: 2018 URL: http://orgprints.org/34633/1/B%C3%A6rekraftig%20utmarksmote%20-%20%C3%B8kologisk%20landbruk%202018.pdf
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Baltic Ecological Recycling Agriculture and Society (BERAS project) - a case of Juva milk system Organic Eprints
Kahiluoto, H.; Bäckman, S.; Hannula, A.; Kakriainen, S.; Krumalowa, V.; Kuisma, M.; Lehto, T.; Mikkola, M.; Sumelius, J.; Seuri, P.; Vihma, A.; Granstedt, A..
The aim of the study was to determine the potential, impact and prerequisites of localization and enhanced recycling in a rural food system, illustrated by the case of Juva milk. An interdisciplinary scenario based on the increase of local, organic milk to 50 % of milk comsumption was created and the sustainability was compared, on the basis of the statistics and data collected from the actors, with the present milk system.
Tipo: Conference paper, poster, etc. Palavras-chave: Recycling; Balancing and resource management.
Ano: 2005 URL: http://orgprints.org/5220/1/5220.pdf
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BioBiogas - Erfahrungen bei der Erzeugung von Biogas im Ökologischen Landbau Organic Eprints
Grieb, Beatrice; Gerlach, Florian.
In der Pionierphase vor der Jahrtausendwende waren Biolandwirte stark vertreten unter den Vorreitern der Energiegewinnung mittels Biomassevergärung. Kein Wunder, schließlich bietet diese Form der Bioenergieerzeugung in der Hand von Landwirten die Chance, in der Biomasse enthaltene Nährstoffe nach der Vergärung in den eigenen Pflanzenbau zurückzuführen. Heute, da in Deutschland ganze Landstriche von der Biogaserzeugung geprägt sind, fristet die Methanerzeugung auf Biobetrieben ein Nischendasein mit wenig Zuwachs. Bei entsprechenden Voraussetzungen jedoch könnte die Biogaserzeugung auf Biobetrieben (»BioBiogas«) nicht nur einen wertvollen Beitrag zur Erzeugung von regenerativem Grund- und Spitzenlaststrom leisten; sie könnte – bei sinnvoller...
Tipo: Book chapter Palavras-chave: Recycling; Balancing and resource management Crop husbandry Soil Environmental aspects Farm nutrient management.
Ano: 2013 URL: http://orgprints.org/26508/1/2013_Grieb_Gerlach_kritischer%20Agrarbericht.pdf
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Bioethanol from Germinated Grains. Organic Eprints
Thomsen, MH; Tajoacha, N; Wu, C; Hovgaard, S; Houmøller, LP; Holm-Nielsen, JB; Thomsen, AB.
The most well-known way to produce bioethanol is by the enzymatic hydrolysis and fermentation of starch. In a new project “BioConcens” (2007) sponsored by DARCOF (DAnish Research Center for Organic Food and farming) one aim is to develop a combined ethanol and biogas production for use in organic farming using starch containing biomass. Natural enzymes from cereals will be used for hydrolysis of starch to glucose in accordance with technology in brewing technology. Commercial enzymes are often produced from gene-modified organisms and will therefore not be used in the suggested organic context or process. A preliminary study was performed in which grains of wheat, rye, and barley were germinated using traditional methods applied in malting for beer...
Tipo: Conference paper, poster, etc. Palavras-chave: Recycling; Balancing and resource management.
Ano: 2007 URL: http://orgprints.org/11302/1/Germinated_grain_29th_symp_Denver_2007.pdf
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Biogaserzeugung ohne Flächenkonkurrenz auf Basis von Zwischenfrüchten, Kleegras und Reststoffen Organic Eprints
Szerencsits, Manfred; Erhart, Eva.
Cover or catch crops have beneficial effects for soil, water, erosion, etc. If harvested, they also provide feedstock for biogas without competition for arable land. The latter also applies to clover grass ley or other residues on organic farms without ruminants and for manure. With an explorative approach, combining field experiments and data collection of practical implementation, we investigated achievable yields and identified recommendations for practical use. Gross energy yields of cover crops varied between 700 and 2000 m³ methane (CH4) ha-1 in Austria. The energy return on energy invested (EROI) ranges from 4 to 7, if biogas is upgraded and com¬pressed for biofuel use. Therefore, about 1000 m³ CH4 ha-1 are remaining as net energy yield from 4.5 t...
Tipo: Conference paper, poster, etc. Palavras-chave: Recycling; Balancing and resource management Crop husbandry Soil Environmental aspects.
Ano: 2015 URL: http://orgprints.org/27238/1/27238_szerencsits.pdf
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Biogaserzeugungspotential aus Gülle und Koppelprodukten in viehhaltenden und viehlosen Betriebssystemen des ökologischen Landbaus Organic Eprints
Möller, Dr. Kurt; Stinner, Walter; Deuker, Arno; Leithold, Prof. Dr. Günter.
In two agricultural systems with and without animal husbandry the potential to produce renewable energy by digesting slurry and organic residues to biogas were assessed. In comparison to some other methods of energy production by biomass biogas production has the advantage of keeping the nutrients of the substrates within the agricultural system. They can be used as fertilisers. In the investigated system with milk production (0,8 cows ha-1, 8 crops, among them 4 cereals, peas, potatoes and 2 clover grasses with catch crops after winter cereals and peas (see DEUKER et al. 2005), it is possible not only to ferment slurry, but also catch crops and straw of peas and cereals. The methan production potential by digesting only slurry is the equivalent of around...
Tipo: Conference paper, poster, etc. Palavras-chave: Recycling; Balancing and resource management Composting and manuring Air and water emissions.
Ano: 2005 URL: http://orgprints.org/3706/1/3706.pdf
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Biomass energy in organic farming - the potential role of short rotattion coppice Organic Eprints
Jørgensen, Uffe; Dalgaard, Tommy; Kristensen, Erik Steen.
One of the aims of organic farming is to “reduce the use of non-renewable resources (e.g. fossil fuels) to a minimum”. So far, however, only very little progress has been made to introduce renewable energy in organic farming. This paper presents energy balances of Danish organic farming compared with energy balances of conventional farming. In general, the conversion to organic farming leads to a lower energy use (approximately 10% per unit of product). But the production of energy in organic farming is very low compared with the extensive utilisation of straw from conventional farming in Denmark (energy content of straw used for energy production was equivalent to 18% of total energy input in Danish agriculture in 1996). Biomass is a key energy carrier...
Tipo: Journal paper Palavras-chave: Recycling; Balancing and resource management.
Ano: 2005 URL: http://orgprints.org/3959/1/3959_Biomass.pdf
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Bioschafwolle - Potential nutzen und besser vermarkten Organic Eprints
Kraus, Marina.
Schafwolle ist ein nachwachsender Rohstoff mit besonderen Eigenschaften. Die Naturfaser ist erneuerbar, biologisch abbaubar, energieeffizient, atmungsaktiv, feuchtigkeitsregulierend, kaum allergen, luftreinigend, lärmdämmend, schwer entflammbar, UV-Licht abwesend, wenig statisch aufgeladen und sehr hitzebeständig. Das Merkblatt entstand im Rahmen einer Semesterarbeit an der ZHAW und zeigt, wo Bioschafwolle wie eingesetzt werden kann und wo Handlungsbedarf besteht.
Tipo: Book Palavras-chave: Recycling; Balancing and resource management Sheep and goats.
Ano: 2014 URL: http://orgprints.org/28481/1/1648-bioschafwolle.pdf
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Calibração e validação dos modelos CENTURY, APSIM e NDICEA de decomposição de materiais orgânicos e mineralização de N para a Mata Atlântica. Organic Eprints
Nascimento, Alexandre Ferreira do.
Muitos sistemas de produção contam basicamente com os nutrientes provenientes da decomposição de materiais orgãnicos adicionados ao solo. A taxa de decomposição desses materiais é produto da combinação de fatores intrinsecos, sua composição quimica e bioquímica, e fatores extrínsecos, sendo as condições de temperatura e umidade do local as variáveis mais importantes, constituindo assim em um processo complexo e dinâmico por ser controlado por vários fatores. Contudo, a decomposição pode ser representada e examinada dentro de esquemas e mecanismos que facilitam seu entendimento, os modelos matemáticos. Dessa forma, o objetivo deste trabalho foi calibrar e validar os modelos Centry, APSIM e NDICEA para decomposição e liberação de N em condições climáticas...
Tipo: Thesis Palavras-chave: Recycling; Balancing and resource management Specific methods.
Ano: 2008 URL: http://orgprints.org/21844/1/Nascimento_Calibracao.pdf
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Characterisation of most relevant feedstock for biogas and bioethanol production in organic farming Organic Eprints
Oleskowicz-Popiel, Piotr; Nielsen, Henrik Bangsø; Schmidt, Jens Ejbye; Thomsen, Anne Belinda; Thomsen, Mette Hedegaard.
see proceeding
Tipo: Conference paper, poster, etc. Palavras-chave: Recycling; Balancing and resource management.
Ano: 2008 URL: http://orgprints.org/14518/1/Piotr_Oleskowicz%2DPopiel_ORAL_Ec%2D29.ppt
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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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