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Registros recuperados: 116
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A caatinga e a oportunidade de mitigação das emissões de gases de efeito estufa pela atividade pastoril. Repositório Alice
ALVES, A. R.; MEDEIROS, A. N. de; ANDRADE, A. P. de; FRIGHETTO, R. T. S.; SILVA, M. J. S..
Resumo: A mudança climática como consequência da emissão antropogênica de gases de efeito estufa está entre os temas em evidência. A agropecuária é apontada como uma das fontes de emissões de gases de efeito estufa, em especial a pecuária que contribui com as emissões de metano (CH4), de origem entérica e de dejetos, e a emissão de óxido nitroso (N2O) do solo de pastagens e da produção de grãos. Metano de ruminantes origina-se, principalmente, como produtos do processo realizado pelos microrganismos do rúmen. Estes microrganismos utilizam nutrientes do alimento ingerido como substrato e produzem diversos compostos como produtos desse metabolismo, dentre eles o metano. Dessa maneira, a emissão de metano está diretamente relacionada à dieta ingerida pelos...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Emissão de metano; Pequeno ruminante; Tanino; Caatinga; Pecuária; Nutrição Animal; Efeito Estufa; Ruminante; Small ruminants; Animal nutrition; Methane; Greenhouse gas emissions; Tannins.
Ano: 2018 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1098449
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A new sward management strategy to mitigate the methane (CH4) emissions by grazing ruminants. Repositório Alice
SAVIAN, J. C.; SCHONS, R. M. T.; SCHNEIDER, E. A. N.; PENSO, J. F.; CAETANO, L. A. M.; MARCHI, D. E.; MEZZALIRA, J. C.; BERNDT, A.; BAYER, C.; Carvalho, P. C. F..
2016
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Sward; Management strategy; Mitigate; Methane; Grazing ruminants.
Ano: 2016 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1050720
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Adição de nitrato encapsulado em suplemento para bovinos Nelore em pastejo durante o período da seca. Repositório Alice
FERNANDES, R. M.; FRIGHETTO, R. T. S.; SAKAMOTO, L.; BERNDT, A.; ARAUJO, R. C. de; RESENDE, F. D. de; SIQUEIRA, G. R..
Resumo: Objetivou-se avaliar o efeito da inclusão de nitrato encapsulado em suplemento para bovinos Nelore em pastejo no período de seca sobre o desempenho animal e a produção de metano. Os tratamentos foram aplicados aos animais através de suplemento proteico-energético na quantidade de 0,7% do peso corporal (PC), sendo: Controle (SC): suplemento contendo ureia (25 g por 100 kg de PC); Nitrato encapsulado (SN): suplemento contendo nitrato encapsulado de forma a fornecer 70 g de nitrato encapsulado ou 47 g NO3 - por 100 kg de PC. Utilizou-se sal duplo de nitrato de cálcio e amônio deca hidratado como fonte de nitrato. O período experimental foi de julho a novembro de 2014. O delineamento foi o em blocos completos ao acaso. Os dados foram analisados por...
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Additive; Methane; Supplementation; Bovino; Suplemento alimentar; Nitrato; Aditivo; Metano; Cattle; Dietary supplements; Nitrates; Greenhouse gas emissions; Methane.
Ano: 2015 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1036243
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Air Emissions of Ammonia and Methane from Livestock Operations: Valuation and Policy Options AgEcon
Shih, Jhih-Shyang; Burtraw, Dallas; Palmer, Karen L.; Siikamaki, Juha.
The animal husbandry industry is a major emitter of methane, which is an important greenhouse gas. The industry is also a major emitter of ammonia, which is a precursor of fine particulate matter, arguably the number-one environment-related public health threat facing the nation. We present an integrated process model of the engineering economics of technologies to reduce methane and ammonia emissions at dairy operations in California. Three policy options are explored: greenhouse gas offset credits for methane control, particulate matter offset credits for ammonia control, and expanded net metering policies to provide revenue for the sale of electricity generated from captured methane gas. Individually, any of these policies appears to be sufficient to...
Tipo: Working or Discussion Paper Palavras-chave: Methane; Ammonia; Carbon dioxide; Greenhouse gases; Climate change; Offset; Particulate matter; Net metering; Environmental policy; CAFO; Manure management; Biodigester; Electricity; Global warming; Cost-benefit; Incentive approach; Livestock Production/Industries; Q2; Q4; Q53.
Ano: 2006 URL: http://purl.umn.edu/10749
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Aislamiento y caracterización in vitro de una bacteria acetogénica ruminal Colegio de Postgraduados
Rodríguez Carrillo, Jaime Azael.
La producción de metano (CH4) en rumiantes representa una pérdida de energía metabólica para el animal y contribuye en la generación de gases efecto invernadero. Una alternativa para disminuir la producción de CH4 en los rumiantes, es desarrollando inoculos de bacterias acetogénicas que compitan con las bacterias metanogénicas por los sustratos utilizados en la producción de metano. En el presente estudio se usó un medio de cultivo selectivo a base de formato y líquido ruminal (F-LR) para el asilamiento de una bacteria ruminal acetogénica. Se determinaron algunas características morfológicas y metabólicas de la bacteria aislada. También, se evaluó su capacidad para producir acetato a partir de formato, y de disminuir la metanogénesis en cocultivo...
Tipo: Tesis Palavras-chave: Metano; Bacteria ruminal acetogénica; Microorganismos ruminales; Gases efecto invernadero; Maestría; Ganadería; Methane; Acetogenica-rumen bacteria; Ruminal microorganims; Greenhouse gas effect.
Ano: 2009 URL: http://hdl.handle.net/10521/1504
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Anaerobic biodegradation of cassava wastewater under different temperatures and inoculums. Repositório Alice
AMORIM, M. C. C. de; SILVA, P. T. de S. e; BARBOSA, P. S.; MONTEFUSCO, N. E..
The production of starch generates, as a by-product, the cassava wastewater (manipueira), which can be treated by anaerobic digestion to provide biogas and minimize its polluting potential. The most commonly utilized biomass in the anaerobic digestion is the anaerobic sludge. The literature presents, as an alternative to sludge, bovine manure and ruminal fluids, being scarce the studies with the cassava wastewater. This research evaluated the influence of temperature on the microbial ability of cattle and goat rumen in anaerobically biodegrading the manipueira in substitution to the anaerobic sludge. The cattle and goat rumen specific methanogenic activities (SMA) were compared with that of the anaerobic sludge. Subsequently, by using the inoculum which...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Águas residuais de mandioca; Resíduos de mandioca; Mandioca; Biodegradação; Rúmen; Biodegradability; Methane; Methane production; Cassava.
Ano: 2019 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1109392
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Archaeal Methane Cycling Communities Associated with Gassy Subsurface Sediments of Marennes-Oleron Bay (France) ArchiMer
Roussel, Erwan; Sauvadet, Anne Laure; Allard, Jonathan; Chaduteau, Carine; Richard, Pierre; Cambon Bonavita, Marie-anne; Chaumillon, Eric.
In Marennes-Oleron Bay, a macro-tidal bay located on the French Atlantic coast, kilometer-scale acoustic turbidity reveals an accumulation of free gas in the sediment. Large concentrations of organic matter and rapid sedimentation rates provide ideal settings for biogenic methane cycling. We integrate seismic, sedimentologic, biogeochemical and molecular genetic approaches to determine whether microbial methane cycling is involved in this process. Here we show that the acoustic turbidity upper boundary matched with X-ray facies displaying fissures with the highest methane concentrations, demonstrating the existence of methane bubbles in the sediment. 16S rRNA and mcrA gene clone libraries were dominated by sequences affiliated to the three known ANME...
Tipo: Text Palavras-chave: Sediment; Methane; McrA; 16S rRNA; Archaea.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6165.pdf
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Batch anaerobic digestion of banana waste - energy potential and modelling of methane production kinetics CIGR Journal
Khan, Muhammad Tahir; Brulé, Mathieu; Maurer, Claudia; Argyropoulos, Dimitrios; Müller, Joachim; Oechsner, Hans.
Different fractions of banana (stalk, peel, and flesh) as well as the whole unpeeled banana were studied in a laboratory Biochemical Methane Potential (BMP) assay. After completion of 35-day digestion at 37°C in 2L-reactors, specific methane yields reached 0.256, 0.322, 0.367 and 0.349 m³/kg VS (volatile solids) for stalk, peel, flesh, and unpeeled banana respectively. Considering the country of Uganda, East Africa, the collection of peels and stalks from banana production would yield a theoretical potential of about 60 GWh of electrical energy per year in biogas plants. In order to verify the suitability of banana fractions to the biogas process, their chemical composition was analyzed, and their methane production kinetics was estimated with exponential...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Energy biogas; Anaerobic digestion; BMP assay; Model; Energy; Methane; Waste.
Ano: 2016 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3244
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Biodegradabilidade anaeróbia dos resíduos provenientes das cadeias produtivas dos biocombustíveis: bagaço de cana-de-açúcar. Infoteca-e
LEITAO, R. C.; COSTA, A. G.; CASSALES, A. R.; ALEXANDRE, L. C.; PINHEIRO, F. C. C.; PINHEIRO, G. C.; VIANA, A. F.; SANTAELLA, S. T.; SANTOS, A. B. dos; ROSA, M. de F..
2013
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E) Palavras-chave: Digestão anaeróbica; Resíduos lignocelulósicos; Biocombustível de segunda geração; Metano; PPM; Anaerobic digestion; Lignocellulosic waste; Second-generaltion biofuel; Methane; MPP.
Ano: 2013 URL: http://www.infoteca.cnptia.embrapa.br/handle/doc/981748
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Biodegradabilidade anaeróbica dos resíduos provenientes das cadeias produtivas dos biocombustíveis: línter. Infoteca-e
LEITAO, R. C.; COSTA, A. G.; CASSALES, A. R.; ALEXANDRE, L. C.; PINHEIRO, F. G. C.; PINHEIRO, G. C.; VIANA, A. F.; SANTAELLA, S. T.; SANTOS, A. B. dos; ROSA, M. de F..
2013
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E) Palavras-chave: Digestão anaeróbia; Resíduos lignocelulosicos; Biocombustível de segunda geração; Metano; PPM; Anaerobic digestion; Lignocellulosic waste; Second-generation biofuel; Methane; MPP.
Ano: 2013 URL: http://www.infoteca.cnptia.embrapa.br/handle/doc/982117
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Biogas production from microalga biomass. Repositório Alice
PERAZZOLI, S.; STEINMETZ, R. L. R.; MEZZARI, M. P.; NUNES, E. O.; SILVA, M. L. B. da.
2013
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Tratamento de efluentes; Biogás; Microalga; Suinocultura; Wastewater treatment; Pig farming; Microalgae; Methane.
Ano: 2013 URL: http://www.alice.cnptia.embrapa.br/handle/doc/970050
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Carbon and nitrogen emissions from stored manure and cropped fields in irrigated mountain oases of Oman JARTS
Buerkert, Andreas; Organic Plant Production and Agroecosystems Research in the Tropics and Subtropics, University of Kassel, Witzenhausen, Germany; Jahn, Henning; Organic Plant Production and Agroecosystems Research in the Tropics and Subtropics, University of Kassel, Witzenhausen, Germany; Golombek, Sabine D.; Organic Plant Production and Agroecosystems Research in the Tropics and Subtropics, University of Kassel, Witzenhausen, Germany; Rawahi, Mohammed N. Al; Organic Plant Production and Agroecosystems Research in the Tropics and Subtropics, University of Kassel, Witzenhausen, Germany; Gebauer, Jens.
Little is known about gaseous carbon (C) and nitrogen (N) emissions from traditional terrace agriculture in irrigated high mountain agroecosystems of the subtropics. In an effort towards filling this knowledge gap measurements of carbon dioxide (CO_2), methane (CH_4), ammonia (NH_3) and dinitrous oxide (N_2O) were taken with a mobile photoacoustic infrared multi-gas monitor on manure-filled PE-fibre storage bags and on flood-irrigated untilled and tilled fields in three mountain oases of the northen Omani Al Jabal al Akhdar mountains. During typical 9-11 day irrigation cycles of March, August and September 2006 soil volumetric moisture contents of fields dominated by fodder wheat, barley, oats and pomegranate ranged from 46-23%. While manure incorporation...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Agroecology; Agronomy and Crop Science; CO2; CH4; NH3; N2O; Carbon dioxide; Methane; Ammonia; Dinitrous oxide; Irrigation agriculture.
Ano: 2010 URL: http://www.jarts.info/index.php/jarts/article/view/2010082734354
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Carbon Emissions, Renewable Electricity and Profits: Comparing Alternative Policies to Promote Anaerobic Digesters on Dairies AgEcon
Key, Nigel D.; Sneeringer, Stacy E..
Biogas recovery systems that use methane from manure to generate electricity have not been widely adopted in U.S. mainly because the costs of constructing and maintaining these systems have exceeded the value of the benefits provided. Climate change mitigation and renewable energy policies could increase profits for the operators of such systems thereby making digester adoption more widespread. For the U.S. Dairy sector, we examine digester adoption rates, emissions reductions, net returns, electricity generation, and program costs under different policy scenarios. We find that 3% or fewer dairies would need to adopt digesters to meet the policy goals of reducing 25% of greenhouse gas emissions from dairy manure or generating one million megawatt hours...
Tipo: Conference Paper or Presentation Palavras-chave: Anaerobic digester; Methane; Dairy; Renewable electricity; Subsidy; Carbon offsets; Climate change; Environmental Economics and Policy; Livestock Production/Industries; Q5.
Ano: 2011 URL: http://purl.umn.edu/103440
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Carbon Markets and Methane Digesters: Potential Implications for the Dairy Sector AgEcon
Key, Nigel D.; Sneeringer, Stacy E..
Anaerobic digesters that capture and burn manure methane can provide a renewable source of energy and reduce greenhouse gas emissions. Paying producers for these emission reductions—either directly or through a carbon offset market—could substantially increase digester adoption. However, there is likely to be wide variation in the scale, location, and characteristics of adopters, so these policies could have long run structural implications for the livestock sector. Using a model of digester profits and data from a nationally-representative survey of dairy operations we estimate the likely distribution of digester adoption and profits under different carbon price scenarios.
Tipo: Journal Article Palavras-chave: Anaerobic digester; Carbon offsets; Climate change; Distribution; Livestock; Methane; Environmental Economics and Policy; Q12; Q16; Q42; Q54; Q58.
Ano: 2011 URL: http://purl.umn.edu/117952
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Carbon Prices Required to Make Digesters Profitable on U.S. Dairy Farms of Different Sizes AgEcon
Lazarus, William F.; Goodkind, Andrew; Gallagher, Paul W.; Conway, Roger K..
Replaced with revised version of paper 02/15/11.
Tipo: Working or Discussion Paper Palavras-chave: Anaerobic digester; Biogas plant; Livestock manure; Electricity; Methane; Carbon offset value; Environmental Economics and Policy; Livestock Production/Industries.
Ano: 2011 URL: http://purl.umn.edu/98628
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Carbon sequestration and greenhouse gases emissions in soil under sewage sludge residual effects. Repositório Alice
PITOMBO, L. M.; CARMO, J. B.; DE MARIA, I. C.; ANDRADE, C. A. de.
Abstract: The large volume of sewage sludge (SS) generated with high carbon (C) and nutrient content suggests that its agricultural use may represent an important alternative to soil carbon sequestration and provides a potential substitute for synthetic fertilizers. However, emissions of CH4 and N2O could neutralize benefits with increases in soil C or saving fertilizer production because these gases have a Global Warming Potential (GWP) 25 and 298 times greater than CO2, respectively. Thus, this study aimed to determine C and N content as well as greenhouse gases (GHG) fluxes from soils historically amended with SS. Sewage sludge was applied between 2001 and 2007, and maize (Zea mays L.) was sowed in every year between 2001 and 2009. We evaluated three...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Adubo de esgoto; Lodo residual; Impacto ambiental; Clima; Dióxido de Carbono; Nitrogênio; Sewage sludge; Environmental impact; Climate changes; Carbon dioxide; Nitrogen; Nitrous oxide; Methane; Biosolids.
Ano: 2015 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1010402
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Cassava wastewater (manipueira) treatment using a two-phase anaerobic biodigestor Ciênc. Tecnol. Aliment.
BARANA,Ana Cláudia; CEREDA,Marney Pascoli.
A two-phase anaerobic biodigestor was employed in order to analyze methane production with different manipueira organic loading rates. The acidogenic phase was carried out in a batch process whereas the methanogenic in an up-flow anaerobic fixed bed reactor with continuous feeding. The organic loading rates varied from 0.33 up to 8.48g of Chemical Demand Oxygen (COD)/L.day. The highest content of methane, 80.9%, was obtained with organic loading rate of 0.33g and the lowest, 56.8%, with 8.48gCOD/L.d. The highest reduction of COD, 88.89%, was obtained with organic loading rate of 2.25g and the lowest, 54.95%, with 8.48gCOD/L.d. From these data it was possible to realize that anaerobic biodigestion can be managed in at least two ways, i.e., for energy...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Anaerobic biodigestion; Biogas; Wastewater; Cassava; Methane.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612000000200010
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Changes in seabed morphology, mud temperature and free gas venting at the Håkon Mosby mud volcano, offshore northern Norway, over the time period 2003-2006 ArchiMer
Foucher, Jean-paul; Dupre, Stephanie; Scalabrin, Carla; Feseker, Tomas; Harmegnies, Francois; Nouze, Herve.
The Håkon Mosby mud volcano is a 1.5-km-diameter geological structure located on the Southwest Barents Sea slope at a water depth of 1,270 m. High-definition seabed mapping of the mud volcano has been carried out in 2003 and 2006. A comparative analysis of the bathymetry and backscatter maps produced from the two surveys shows subtle morphological changes over the entire crater of the mud volcano, interpreted to be the consequence of mud eruption events. Mud temperature measurements point to a persistently warm mud at shallow depth in the crater. This is explained by upward fluid advection, rather than conductive cooling of mud flows. The small-scale spatial variability in the temperature distribution may be related to mud outflows or changes in the fluid...
Tipo: Text Palavras-chave: Sw barents sea; Cold seep ecosystems; Fluid flow; Methane; Sediment; Onshore; Fluxes; Margin; Water.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00004/11527/10261.pdf
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Climate Change Policy and the Adoption of Methane Digesters on Livestock Operations AgEcon
Key, Nigel D.; Sneeringer, Stacy E..
Methane digesters—biogas recovery systems that use methane from manure to generate electricity—have not been widely adopted in the United States because costs have exceeded benefits to operators. Burning methane in a digester reduces greenhouse gas emissions from manure management. A policy or program that pays producers for these emission reductions—through a carbon offset market or directly with payments—could increase the number of livestock producers who would profit from adopting a methane digester. We developed an economic model that illustrates how dairy and hog operation size, location, and manure management methods, along with electricity and carbon prices, could influence methane digester profits. The model shows that a relatively moderate...
Tipo: Report Palavras-chave: Methane; Methane digesters; Manure; Livestock; Climate change; Greenhouse gases; Carbon offset; Environmental Economics and Policy; Financial Economics; Livestock Production/Industries; Resource /Energy Economics and Policy.
Ano: 2011 URL: http://purl.umn.edu/102758
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Cold-seep assemblages on a giant pockmark off West Africa: spatial patterns and environmental control ArchiMer
Olu, Karine; Caprais, Jean-claude; Fifis, Alexis; Fabri, Marie-claire; Galeron, Joelle; Budzinsky, H; Le Menach, K; Khripounoff, Alexis; Ondreas, Helene; Sibuet, Myriam.
A giant pockmark colonised by dense cold-seep assemblages near 3160 m depth along the Congo-Angola margin has been surveyed by the ROV Victor 6000. The quantitative distribution of chemosynthetic communities was mapped along the dive tracks from a video study using GIS and image mosaicking. Several types of faunal assemblages, either dominated by bivalves of the families Mytilidae (Bathmodiolus sp.) Vesicom idae (Calyptogena sp., 'Vesicomya' aff. chuni), or by Siboglinidae polychaetes (Escarpia southwardae) were mapped over the 800-m diameter pockmark area and sampled for fauna, water and sediment. The isotopic analyses (delta C-13) of tissues from symbiont-bearing species were within the range typical of nutrition via symbiosis using methane for mussels...
Tipo: Text Palavras-chave: Symbiont bearing species; Spatial distribution; Methane; Megafauna; Cold seeps.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-2681.pdf
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