Methanogenesis
Mostrando 1-12 de 255 artigos, teses e dissertações.
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1. HPLC METHOD IMPROVEMENT FOR 4-NONYLPHENOL DETERMINATION IN ANAEROBIC REACTORS: DECREASING SOLVENT CONSUMPTION AND WASTE GENERATION
The aim of this study was to develop a chromatographic method for 4-NP determination in anaerobic batch reactors using low amount of organic solvents and also evaluate 4-NP degradation in the presence of different co-substrates. Chromatographic parameters was improved for stationary phase (C-8 column), mobile phase (acetonitrile/water solution 90:10, v:v), c
Quím. Nova. Publicado em: 2020-09
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2. Soil CH4 and N2O Emissions from Rice Paddy Fields in Southern Brazil as Affected by Crop Management Levels: a Three-Year Field Study
ABSTRACT Rice yield increases in response to improvements in crop management, but the impact on greenhouse gas (GHG) emissions in the subtropical region of Southern Brazil remains unknown. A three-year field study was developed aiming to evaluate the impact that an increase in crop management levels (high and very high) has on soil methane (CH4) and nitrous
Rev. Bras. Ciênc. Solo. Publicado em: 03/05/2018
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3. BIOCONVERSION OF CELLULOSE INTO HYDROGEN, BIOGAS AND ORGANIC ACIDS USING MICROBIAL CONSORTIUM FROM A PULP AND PAPER MILL WASTEWATER TREATMENT PLANT
This study evaluated the potential of a microbial consortium collected from a pulp and paper mill wastewater treatment plant (WWTP) for converting cellulose to hydrogen, biogas and organic acids. Fermentation tests were conducted in batch reactors fed with different concentrations of cellulose as substrate: (C1) 2.0 g L -1; (C2) 5.0 g L -1 and (C3) 10.0 g L
Quím. Nova. Publicado em: 2018-02
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4. Physiological adaptations of ruminants and their potential relevance for production systems
ABSTRACT Herbivores face the dilemma that the level of feed intake is negatively related to factors that determine digestive efficiency, such as thoroughness of ingesta comminution by chewing, and retention of digesta in the digestive tract. Ruminants have evolved particular adaptations to solve this dilemma. Most ruminants share the characteristic of “dig
R. Bras. Zootec.. Publicado em: 2017-07
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5. Potential and existing mechanisms of enteric methane production in ruminants
Enteric methane (CH4) emissions in ruminants have attracted considerable attention due to their impact on greenhouse gases and the contribution of agricultural practices to global warming. Over the last two decades, a number of approaches have been adopted to mitigate CH4 emissions. However, the mechanisms of methanogenesis have still not been fully defined.
Sci. agric. (Piracicaba, Braz.). Publicado em: 2014-10
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6. Kinetic modeling and microbial assessment by fluorescent in situ hybridization in anaerobic sequencing batch biofilm reactors treating sulfate-rich wastewater
This paper reports the results of applying anaerobic sequencing batch biofilm reactors (AnSBBR) for treating sulfate-rich wastewater. The reactor was filled with polyurethane foam matrices or with eucalyptus charcoal, used as the support for biomass attachment. Synthetic wastewater was prepared with two ratios between chemical oxygen demand (COD) and sulfate
Brazilian Journal of Chemical Engineering. Publicado em: 2011-06
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7. Variação diária da emissão de metano em solo cultivado com arroz irrigado no Sul do Brasil / Diurnal variation of methane emission from a paddy field under rice cultivation in the Southern Brazil
O metano (CH4 ) apresenta um potencial de aquecimento 23 a 32 vezes maior do que o dióxido de C e a sua emissão diária em lavouras de arroz varia com a temperatura do solo e da água, e o metabolismo das plantas. O objetivo deste estudo foi determinar o horário apropriado à coleta de amostras de ar para quantificar a emissão média diária de CH4, info
Publicado em: 2010
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8. Comunidade microbiana e produção de metano em reator anaeróbio em batelada com metilamina como fonte de carbono / Microbial community and methane production in anaerobic batch reactor with methylamine as carbon source
A degradação da metilamina foi investigada por meio da avaliação da velocidade específica máxima de produção de metano (VEM CH4) e da comunidade microbiana relacionada aos Domínios Bacteria e Archaea. Para isso, foram realizados dois ensaios com reatores anaeróbios em batelada inoculados com lodo granulado oriundo de reator UASB usado no tratamento
Publicado em: 2010
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9. Sulfide toxicity kinetics of a uasb reactor
The effect of sulfide toxicity on kinetic parameters of anaerobic organic matter removal in a UASB (up-flow anaerobic sludge blanket) reactor is presented. Two lab-scale UASB reactors (10.5 L) were operated continuously during 12 months. The reactors were fed with synthetic wastes prepared daily using glucose, ammonium acetate, methanol and nutrient solution
Brazilian Journal of Chemical Engineering. Publicado em: 2009-12
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10. Influência dos nutrientes nitrogênio e fósforo na degradação anaeróbia do pentaclorofenol e na diversidade microbiana dos sedimentos enriquecidos do Estuário de Santos-São Vicente, Estado de São Paulo / Influence of nitrogen and phosphorus nutrients on the anaerobic degradation of pentachlorophenol and on the natural microbial diversity of sediments from the Santos-São Vicente estuary, state of São Paulo, Brazil
The research presented here aimed to determine the optimal nutritional conditions for the use of sediment from the Santos-São Vicente estuary in the state of São Paulo, Brazil, as an inoculum for a horizontal-flow anaerobic immobilized biomass reactor (HAIB) applied to the anaerobic degradation of pentachlorophenol (PCP), seeking to apply the technology on
Publicado em: 2007
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11. Influência do oxigênio no crescimento de arquéias metanogênicas e bactérias redutoras de sulfato em reatores anaeróbios em batelada / Oxygen influence on methanogenic archaea and sulfate reducing bacterias growth in anaerobic batch reactors
This work aimed to evaluate the behavior of methanogenic archaea and sulfate reducing bacteria in the presence of oxygen, using anaerobic batch reactors under sulfidogenic and mesophilic conditions. The reactors were inoculated with anaerobic sludge from UASB reactor treating poultry wastes. Third copies of the reactors were fed with ZINDER medium, increased
Publicado em: 2007
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12. Avaliação da metanogênese e sulfetogênese na presença de oxigênio, sob diferentes relações etanol/sulfato, utilizando técnicas de biologia molecular / Evaluation of methanogenesis and sulfidogenesis in presence of oxygen under different ethanol/sulfate ratios using molecular biology techniques
Neste trabalho foi realizada a caracterização microbiana, por meio de técnicas de biologia molecular, do lodo granulado de reator anaeróbio de fluxo ascendente e manta de lodo (UASB - Upflow Anaerobic Sludge Blanket Reactor) operado sob condições mesofílicas (30 + OU -2ºC) e sulfetogênicas, com (TDH) de 12 h, na presença de 3,0 + OU -0,7 mg/L de ox
Publicado em: 2007