Nitrification Activity
Mostrando 1-12 de 45 artigos, teses e dissertações.
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1. Humic fractions of forest, pasture and maize crop soils resulting from microbial activity
Humic substances result from the degradation of biopolymers of organic residues in the soil due to microbial activity. The objective of this study was to evaluate the influence of three different ecosystems: forest, pasture and maize crop on the formation of soil humic substances relating to their biological and chemical attributes. Microbial biomass carbon
Braz. J. Microbiol.. Publicado em: 2014-09
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2. Remoção de matéria orgânica carbonácea e nitrogênio em Reator Aeróbio-Anóxico de Leito Fixo (RAALF) aplicado ao pós-tratamento de efluente de reator anaeróbio / Removal of carbonaceous organic matter and nitrogen in an Aerobic-Anoxic Fix Bed Reactor (AAFBR) applied to the tertiary treatment of domestic wastewater
This work presents the Aerobic-Anoxic Fix Bed Reactor (AAFBR), with superimposed chambers, as an alternative concerning the post-treatment of anaerobic reactors efiluents aiming the removal of carbonaceous organic matter and nitrogen. Polyurethane foam cubic matrices (5 mm) were used packing material. Hydrodynamic essays were carried out in order to obtain t
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 22/07/2011
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3. Fertilización nitrogenada después de la poda del cafeto robusta en Cambisoles
The objective of this work was to evaluate the influence of nitrogen mineral fertilization, after robusta coffee pruning, on crop yield and some chemical (pH, organic matter) and microbiological (biological gas exchange and nitrification) soil indicators in two Cambisols in Tercer Frente, Santiago de Cuba, and La Alcarraza, Holguín, during the years 2003-20
Pesquisa Agropecuária Brasileira. Publicado em: 2011-08
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4. Impact of different grazing systems for bovine cattle on the soil microbiological and chemical characteristics
The objective of this work was to study the effect of grazing systems: rotational, continuous and the absence of cattle, in pastures of Brachiaria brizantha on microbial activity (respiratory, potential nitrification, solubilizing, and enzymatic) and on the chemical attributes (contents of organic carbon, total nitrogen, organic phosphorus, and moisture) of
Revista Brasileira de Zootecnia. Publicado em: 2011-07
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5. OtimizaÃÃo da remoÃÃo biolÃgica de nitrogÃnio de efluente de abate e industrializaÃÃo de aves usando reator em bateladas sequenciais
As agroindÃstrias destacam-se como grandes poluidoras, devido, especialmente, Ãs elevadas vazÃes com que geram seus efluentes ricos em carga orgÃnica, nutrientes (principalmente nitrogÃnio e fÃsforo), sÃlidos, Ãleos e graxas. Neste setor enquadram-se os abatedouros e frigorÃficos de aves. A remoÃÃo de nitrogÃnio das Ãguas residuÃrias à geralme
Publicado em: 2010
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6. Conversão de compostos nitrogenados em reatores biológicos: operação, caracterização microbiológica e filogenética / Nitrogen compounds conversion in biological reactors: operation, microbiological and phylogenetic characterization
Esta pesquisa objetivou enriquecer biomassa capaz de realizar a oxidação anaeróbia do amônio (anammox) utilizando inóculo proveniente de reator nitrificante-desnitrificante, com a finalidade de estabelecer biofilme nitrificante-anammox em reator de leito fixo. O enriquecimento foi realizado em reator operado em bateladas sequenciais (RBS), com volume ú
Publicado em: 2010
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7. Bioindicadores de qualidade de solo em diferentes ecossistemas
Changes due to soil management and cultivated plant species may influence carbon, nitrogen and phosphorus cycling. Cycling depends on the integration of physical, chemical and mainly microbiological processes. This work assessed some microbial activity and processes related to carbon, nitrogen and phosphorus cycles in soil from six ecosystems in Guarapuava,
Publicado em: 2009
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8. Reator de leito expandido em escala plena com zonas anaeróbia e aeróbia sobrepostas: remoção conjunta de matéria orgânica e nutrientes e estudo do comportamento microbiológico do biofilme, por respirometria e microsensor de OD / Full scale expanded bed reactor with overlaid anaerobic and aerobic zones: joint removal of organic matter and nutrients and the study of microbiological biofilm behavior and DO microsensor
The current research aimed the development of a 159 M POT.3total volume biological reactor, with a expanded and partially aerated granular coal bed (activated and anthracite), to promote organic matter and nutrients (N and P) removal from wastewater due to the maintenance of anaerobic and aerobic environments, stratified throughout the height of the reactor
Publicado em: 2007
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9. Atributos químicos e microbiológicos do solo após aplicações de resíduos de suínos em sistema de plantio direto
Intensive rearing of swine livestock results in a huge amount of liquid residues (pig slurry), which can be a source of contamination to the environment. This residue contains phosphorus nitrogen and other nutrients; therefore it seems appropriate to use it on cropped soils as fertilizer. This work aimed to evaluate chemical and microbiological changes in th
Publicado em: 2006
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10. Otimização tecnológica de estações de tratamento biológico (ETB) de águas residuárias de coqueria
The treatment of effluents in a coke industry occurs generally by activated sludge process. The operation and efficiency of the process depends on a large number of factors including chemical composition, quantity of the effluents, mass and composition of the activated sludge, environmental temperature, precipitation, solar radiation, dissolved oxygen, and h
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/05/2005
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11. Apparent and Measured Rates of Nitrification in the Hypolimnion of a Mesotrophic Lake
Three distinct phases were observed in the change of dissolved inorganic nitrogen concentrations in the hypolimnion of Grasmere. The second phase of decreasing ammonia and increasing nitrate concentrations was typical of the nitrification process. Observations on nitrate concentration gradients between surface sediments and the water column and experiments u
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12. Microscale Distribution of Nitrification Activity in Sediment Determined with a Shielded Microsensor for Nitrate
Microprofiles of O2 and NO3- were measured simultaneously in freshwater sediment with microsensors which were completely free from electrical interference because of coaxial designs. Depth profiles of nitrification (NO3- production) and denitrification (NO3- consumption) were subsequently determined by computer simulation of the measured microprofiles. The n