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Registros recuperados: 108 | |
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Peripolli,Vanessa; Barcellos,Júlio Otávio Jardim; Prates,Ênio Rosa; McManus,Concepta; Stella,Laion Antunes; Camargo,Cláudia Medeiros; Costa Jr,João Batista Gonçalves; Bayer,Cimélio. |
ABSTRACT The objective of this study was to evaluate the effects of mineral and protein-energy (MPES), exogenous fibrolytic enzyme supplements (ES), combination of MPES + ES, and straw without supplement (WS) on digestibility, fermentation kinetic parameters, cumulative gas production, methane, CO2 production, and volatile fatty acid concentration of rice straw of low and high nutritional value, estimated by in vitro techniques. The experimental design was randomized and factorial 2 × 4: two straws (low and high nutritional value) incubated with four supplements (MPES, ES, MPES + ES, and WS) and their interactions. Four experimental periods were used, totaling four replications per treatment over time. Data were analyzed by PROC MIXED of SAS. The in vitro... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Digestibility; Digestion kinetics; Fatty acid; Gas production; Methane. |
Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982017000300240 |
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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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Matter,Juliana M.; Costa,Mônica S. S. de M.; Costa,Luiz A. de M.; Pereira,Dercio C.; Varennes,Amarílis de; Tessaro,Dinéia. |
ABSTRACT Aiming to evaluate different wastewaters in the anaerobic co-digestion (ACoD) of hatchery wastes, a batch test was conducted in bench horizontal digesters. At the end of the process, the potential production of biogas and methane was calculated as well as the chemical composition (macro- and micronutrients) of the effluent and the concentrations of methane and carbon dioxide gas at 60 days. The monitoring of the process included observations of the reduction of the organic carbon, chemical oxygen demand, and total (TS) and volatile solids (VS), as well as the variation of pH and electrical conductivity (EC). The results showed that the mixing between the hatchery fresh waste and swine wastewater (T4) and among fresh hatchery waste, water from the... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biogas; Methane; Swine wastewater; Slaughterhouse wastewater. |
Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017000900651 |
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Urbinati,Estevão; Oliveira,Roberto Alves de. |
In this work it was evaluated the performance of two systems of swine wastewater treatment consisting of two-stage upflow anaerobic sludge blanket (UASB) reactors, with and without post-treatment in sequencing batch reactor (SBR), fed continuously, with aerobic phase. The UASB reactors in the first stage had 908 L in the sets I and II, and in the second stage 350 and 188 L, respectively. In the set II the post-treatment was performed in a SBR of 3,000 L. The hydraulic detention times in the anaerobic treatment systems were 100, 75 and 58 h in the set I; 87, 65 and 51 h in the set II; and 240 and 180 h in the SBR. The volumetric organic load applied in the first stage UASB reactors ranged from 6.9 to 12.6 g total COD (L d)-1 in the set I and 7.5 to 9.8 g... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Coliforms; Methane; Two-stage anaerobic reactors; Nutrients removal; Combined treatment. |
Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162014000100014 |
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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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Kessler, Jd; Reeburgh, Ws; Southon, J; Seifert, R; Michaelis, W; Tyler, Sc. |
Numerous methane-emitting bottom features, such as seeps, methane clathrate hydrates (clathrates), and mud volcanoes, have been identified recently in the Black Sea. The fluxes of methane from these sources averaged over large spatial scales are unknown. Here we take advantage of the fact that the Black Sea is a semi-enclosed basin with restricted deep water circulation to establish first-order estimates of basin-wide fluxes of methane from these sources to the water column and atmosphere. First, we measured tile natural radiocarbon content of methane (C-14-CH4) dissolved in the water column and emitted from seeps. The C-14-CH4 results showed that the dominant source of methane to the water column is emitted from seeps and a smaller source is... |
Tipo: Text |
Palavras-chave: Methane; Seeps; Methane clathrate hydrates; Black Sea; Methane radiocarbon; Seep methane flux. |
Ano: 2006 |
URL: https://archimer.ifremer.fr/doc/00209/31994/30436.pdf |
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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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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.. |
Tipo: Folhetos |
Palavras-chave: Digestão anaeróbica; Resíduos lignocelulósicos; Biocombustível de segunda geração; PPM; Lignocellulosic waste; Second-generaltion biofuel; MPP; Metano; Anaerobic digestion; Methane. |
Ano: 2013 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/981748 |
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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.. |
Tipo: Folhetos |
Palavras-chave: Resíduos lignocelulosicos; Biocombustível de segunda geração; PPM; Lignocellulosic waste; MPP; Second-generation biofuel; Digestão Anaeróbia; Metano; Anaerobic digestion; Methane. |
Ano: 2013 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/982117 |
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Praes,Maria Fernanda Ferreira Menegucci; Lucas Junior,Jorge de; Orrico,Ana Carolina Amorim; Orrico Junior,Marco Antonio Previdelli; Hermes,Rafael Gustavo; Sorbara,José Otávio Berti; Duarte,Karina Ferreira; Schwingel,Alice Watte; Sgavioli,Sarah; Domingues,Carla Heloisa de Faria; Sunada,Natália da Silva. |
ABSTRACT The effect of additives used in the feed of broilers on anaerobic bio-digestion of poultry litter was evaluated. Four diets were used: NC: negative control; DFM: NC + 500 ppm direct-fed microbials (DFM) containing Bacillus subtilis and Bacillus licheniformis; ENZ: diet formulated with an enzyme blend (20 ppm phytase, 200 ppm protease and 200 ppm xylanase); DFM+E: ENZ + DFM. Substrates for the anaerobic bio-digestion were prepared with litter from each treatment, containing 4 % total solids (TS). These were used in 16 continuous bio-digesters with a 2 kg d−1 load, to determine the production and potential biogas production and composition during an 85-day period. Influent and effluent samples were collected for the amounts of TS and volatile solids... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Additives; Bio-digestion; Bio-digester; Methane; Livestock residues. |
Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000500406 |
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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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Registros recuperados: 108 | |
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