Partial Nitrification
Mostrando 1-9 de 9 artigos, teses e dissertações.
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1. 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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2. Estudo da remoção de nitrogênio via nitrito e via nitrato em sistemas de lodo ativado alimentados por despejo com elevada concentração de fenol. / Study of nitrogen removal via nitrite and via nitrate in activated sludge systems fed by wastewater with high phenol concentration.
Wastewaters containing high phenol and ammonium concentrations present a great pollutant potential to the environment. An example of this kind of effluent is the discharge of coke-plants, which presents, quantitatively, the phenols as the main organic compound. Inorganic compounds are also present in these wastewaters and are mainly cyanide, thiocyanate, sul
Publicado em: 2007
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3. Nitrogen removal through nitrite in sequential batch reactor with immobilized biomass and intermittent aeration / Remoção de nitrogênio via nitrito em reator operado em bateladas seqüenciais contendo biomassa imobilizada e aeração intermitente
Um reator de leito fixo, preenchido com biomassa imobilizada em espuma de poliuretano, foi operado em bateladas seqüenciais, alimentado com substrato sintético com concentração de nitrogênio amoniacal de 125, 250, 500 e 40 mg/L. O principal objetivo da pesquisa foi verificar a possibilidade de se promover a nitrificação curta no reator submetido à ae
Publicado em: 2005
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4. A comparison of NO and N2O production by the autotrophic nitrifier Nitrosomonas europaea and the heterotrophic nitrifier Alcaligenes faecalis.
Soil microorganisms are important sources of the nitrogen trace gases NO and N2O for the atmosphere. Present evidence suggests that autotrophic nitrifiers such as Nitrosomonas europaea are the primary producers of NO and N2O in aerobic soils, whereas denitrifiers such as Pseudomonas spp. or Alcaligenes spp. are responsible for most of the NO and N2O emission
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5. Selective Inhibition of Ammonium Oxidation and Nitrification-Linked N2O Formation by Methyl Fluoride and Dimethyl Ether
Methyl fluoride (CH3F) and dimethyl ether (DME) inhibited nitrification in washed-cell suspensions of Nitrosomonas europaea and in a variety of oxygenated soils and sediments. Headspace additions of CH3F (10% [vol/vol]) and DME (25% [vol/vol]) fully inhibited NO2- and N2O production from NH4+ in incubations of N. europaea, while lower concentrations of these
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6. Production of NO2- and N2O by Nitrifying Bacteria at Reduced Concentrations of Oxygen
Pure cultures of the marine ammonium-oxidizing bacterium Nitrosomonas sp. were grown in the laboratory at oxygen partial pressures between 0.005 and 0.2 atm (0.18 to 7 mg/liter). Low oxygen conditions induced a marked decrease in the rate for production of NO2-, from 3.6 × 10−10 to 0.5 × 10−10 mmol of NO2- per cell per day. In contrast, evolution of N2
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7. Effects of Carbon Substrates on Nitrite Accumulation in Freshwater Sediments
The contribution of the biochemical pathways nitrification, denitrification, and dissimilatory NO3− reduction to NH4+ (DNRA) to the accumulation of NO2− in freshwaters is governed by the species compositions of the bacterial populations resident in the sediments, available carbon (C) and nitrogen (N) substrates, and environmental conditions. Recent studi
American Society for Microbiology.
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8. Relative Rates of Nitric Oxide and Nitrous Oxide Production by Nitrifiers, Denitrifiers, and Nitrate Respirers
Biogenic emissions of nitric and nitrous oxides have important impacts on the photochemistry and chemistry of the atmosphere. Although biogenic production appears to be the overwhelming source of N2O, the magnitude of the biogenic emission of NO is very uncertain. In soils, possible sources of NO and N2O include nitrification by autotrophic and heterotrophic
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9. Community Analysis of Ammonia and Nitrite Oxidizers during Start-Up of Nitritation Reactors
Partial nitrification of ammonium to nitrite under oxic conditions (nitritation) is a critical process for the effective use of alternative nitrogen removal technologies from wastewater. Here we investigated the conditions which promote establishment of a suitable microbial community for performing nitritation when starting from regular sewage sludge. Reacto
American Society for Microbiology.