Nitrite Accumulation
Mostrando 1-12 de 86 artigos, teses e dissertações.
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1. STABILITY OF PARTIAL NITRITATION OF POULTRY SLAUGHTERHOUSE WASTEWATER IN A SEQUENTIAL BATCH REACTOR
ABSTRACT The aim of this study was to monitor the stabilization of a sequential batch reactor (SBR) regarding the partial nitritation of poultry slaughterhouse wastewater, aiming at preparing it for a reactor with bacteria that promote anaerobic ammonia oxidation (anammox). A cylindrical reactor with a useful volume of 3.5 L, mechanical agitation (50 rpm), a
Eng. Agríc.. Publicado em: 2017-04
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2. Nitrogen removal from landfill leachate via the nitrite route
The feasibility of removing nitrogen from mature landfill leachate using the nitrite route was investigated in a two-stage SBR system - (1º first stage, short-cut nitrification; second stage, denitrification via nitrite. With a volumetric exchange rate (n) of 0.3 d-1 and an oxygen concentration of between 1.2 and 1.3 mg/L, the nitrite accumulation ratio - (
Brazilian Journal of Chemical Engineering. Publicado em: 2012-06
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3. Nitrificação e desnitrificação simultânea em reator com biomassa em suspensão e fluxo contínuo de esgoto / Simultaneous nitrification and denitrification in reactor with biomass in suspension and continuous flow of sewage
It was developed in Europe the process known as Simultaneous Nitrification and Denitrification (SND) in activated sludge that operates with a SRT, high enough for nitrification to occur, even with low concentration of dissolved oxygen in the aeration tanks. Such situation in the tanks is possible to maintain anoxic conditions inside the flocs and to have the
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/07/2011
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4. Biological nitrogen removal over nitritation/denitritation using phenol as carbon source
A laboratory scale activated sludge sequencing batch reactor was operated in order to obtain total removal of influent ammonia (200; 300 and 500 mg NH3-N.L-1) with sustained nitrite accumulation at the end of the aerobic stages with phenol (1,000 mg C6H5OH.L-1) as the carbon source for denitrifying microorganisms during the anoxic stages. Ammonia removal abo
Brazilian Journal of Chemical Engineering. Publicado em: 2011-06
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5. Remoção de nitrogênio de lixiviado de resíduos sólidos urbanos por meio do processo nitrificação/desnitrificação via nitrito em reator em bateladas sequenciais / Nitrogen removal from solid waste leachate by nitrification/denitrification via nitrite in a sequencing batch reactor.
The leachate is an effluent with high potential to cause environmental problems in receiving body due to the high concentrations of ammoniacal nitrogen. Currently, several treatment processes have been studied to promote nitrogen removal by the hand of conventional process variations. Therefore, the present study was developed to evaluate the performance of
Publicado em: 2009
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6. Aplicação de misturas granuladas NK e NS em cultivar de arroz (Oryza sativa) / Application of NK and NS granular mixtures in a rice (Oryza sativa) cultivar
This study aimed to evaluate NK (urea and potassium chloride) and NS (urea and ammonium sulfate) fertilizers as granular mixtures and pastilles, in the rice cultivar IAC 202 in soil samples of different textures, from Fragiudult and Udult soils. Experiments were held in a greenhouse with controlled temperature and humidity, located in the experimental area o
Publicado em: 2009
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7. Water quality in cultivation of shrimp in the Great Aracaju - Sergipe, Brazil. / Qualidade da água na carcinicultura na Grande Aracaju - Sergipe, Brasil.
Known to be essential for human survival, water is one of the most important natural resources of the planet; its quality is of fundamental importance for the sustainability of any agroecosystem. There is a worldwide trend in its preservation, to ensure its availability for various purposes. The aquaculture activity in the cultivation of shrimp has as one of
Publicado em: 2009
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8. Operação de reator em bateladas sequenciais visando a nitritação de lixiviado de aterro novo: avaliação em escala de bancada
O lixiviado gerado a partir da degradação de resíduos sólidos comumente apresenta elevadas concentrações de nitrogênio amoniacal. Tal composto é identificado como um dos mais tóxicos aos organismos vivos. Nos últimos anos o processo de nitrificação/desnitrificação via nitrito vem sendo investigado como nova alternativa ao processo convencional
Publicado em: 2008
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9. Comparação dos índices de qualidade da água e usos do fator contaminação e índice de geoacumulação para os sedimentos da microbacia do arroio João Corrêa, São Leopoldo, RS, Brasil
The João Corrêa creek, with 7 km length and a 9.7 km2 micro basin (MbaJC), has its main source into the forested hilly landscape of Sapucaia county and flows trough out the São Leopoldo city, receiving along his course several urban wastes and industrial effluents. Looking for a quantified evaluation of environmental impacts related to human activities, m
Publicado em: 2008
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10. 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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11. Effects of Certain Herbicides and Their Combinations on Nitrate and Nitrite Reduction 1
A study was made concerning the effect of various herbicides, when used alone or in combination, on nitrite accumulation in excised leaves of wheat (Triticum aestivum L., var. `Centurk'). Treatment of leaves with photosynthetic inhibitor herbicides, known to interfere with the transfer of light energy, caused accumulation of nitrite under illuminated, aerobi
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12. Kinetic Explanation for Accumulation of Nitrite, Nitric Oxide, and Nitrous Oxide During Bacterial Denitrification †
The kinetics of denitrification and the causes of nitrite and nitrous oxide accumulation were examined in resting cell suspensions of three denitrifiers. An Alcaligenes species and a Pseudomonas fluorescens isolate characteristically accumulated nitrite when reducing nitrate; a Flavobacterium isolate did not. Nitrate did not inhibit nitrite reduction in cult