Nitrification Denitrification
Mostrando 37-48 de 76 artigos, teses e dissertações.
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37. Desenvolvimento e avaliação de sistema de leito fixo reator misto radial seguido de reator anóxico horizontal, para remoção de matéria orgânica e de nitrogênio de esgoto sanitário / Immobilized bed system development and evaluation radial mixed reactor followed by horizontal-flow anoxic reactor for organic matter and nitrogen reduction in domestic wastewater
Os sistemas combinados anaeróbio/aeróbio, para tratamento de água residuária, têm sido considerados alternativas viáveis do ponto de vista técnico-econômico em relação aos sistemas tradicionais. Este trabalho consiste no desenvolvimento de nova configuração para um sistema, com dois reatores operados seqüencialmente, composto por Reator Misto Ra
Publicado em: 2003
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38. Remoção de nitrogenio do esgoto sanitario pelo processo de lodo ativado por batelada
The excess of nutrients found in domestic or industrial wastewaters, like nitrogen and phosphorus, may lead to a process of eutrofication and originate adverse effects to the environment and to the human health. For this reason it is very important to consider an advanced treatment of those wastewaters when dealing with water resources, including their reuse
Publicado em: 1995
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39. Simultaneous Nitrification and Denitrification in Aerobic Chemostat Cultures of Thiosphaera pantotropha
Thiosphaera pantotropha is capable of simultaneous heterotrophic nitrification and aerobic denitrification. Consequently, its nitrification potential could not be judged from nitrite accumulation, but was estimated from complete nitrogen balances. The maximum rate of nitrification obtained during these experiments was 93.9 nmol min−1 mg of protein−1. The
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40. Distinguishing between Nitrification and Denitrification as Sources of Gaseous Nitrogen Production in Soil †
The source of N2O produced in soil is often uncertain because denitrification and nitrification can occur simultaneously in the same soil aggregate. A technique which exploits the differential sensitivity of these processes to C2H2 inhibition is proposed for distinguishing among gaseous N losses from soils. Denitrification N2O was estimated from 24-h laborat
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41. Simulation Model of the Coupling between Nitrification and Denitrification in a Freshwater Sediment
A model was constructed to simulate the results of experiments which investigated nitrification and denitrification in the freshwater sediment of Lake Vilhelmsborg, Denmark (K. Jensen, N. P. Sloth, N. Risgaard-Petersen, S. Rysgaard, and N. P. Revsbech, Appl. Environ. Microbiol. 60:2094-2100, 1994). The model output faithfully represented the profiles of O2 a
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42. Quantification of Ammonia-Oxidizing Bacteria and Factors Controlling Nitrification in Salt Marsh Sediments
To elucidate the geomicrobiological factors controlling nitrification in salt marsh sediments, a comprehensive approach involving sediment geochemistry, process rate measurements, and quantification of the genetic potential for nitrification was applied to three contrasting salt marsh habitats: areas colonized by the tall (TS) or short (SS) form of Spartina
American Society for Microbiology.
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43. Nitrification and Denitrification in Lake and Estuarine Sediments Measured by the 15N Dilution Technique and Isotope Pairing
The transformation of nitrogen compounds in lake and estuarine sediments incubated in the dark was analyzed in a continuous-flowthrough system. The inflowing water contained 15NO3-, and by determination of the isotopic composition of the N2, NO3-, and NH4+ pools in the outflowing water, it was possible to quantify the following reactions: total NO3- uptake,
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44. Estimates of Denitrification and Nitrification in Coastal and Estuarine Sediments
Denitrification and nitrification in sediments of Tama Estuary and Odawa Bay, Japan, were investigated by the combined use of a continuous-flow sediment-water system and a 15N tracer technique. At Odawa Bay, the nitrification rate was comparable to the nitrate reduction rate, and 70% of the N2 evolved originated from nitrogenous oxides (nitrate and nitrite)
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45. Sediment Nitrification, Denitrification, and Nitrous Oxide Production in a Deep Arctic Lake †
We used a combination of 15N tracer methods and a C2H2 blockage technique to determine the role of sediment nitrification and denitrification in a deep oligotrophic arctic lake. Inorganic nitrogen concentrations ranged between 40 and 600 nmol · cm−3, increasing with depth below the sediment-water interface. Nitrate concentrations were at least 10 times lo
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46. Estimation of Nitrification and Denitrification from Microprofiles of Oxygen and Nitrate in Model Sediment Systems
The coupling between nitrification and denitrification and the regulation of these processes by oxygen were studied in freshwater sediment microcosms with O2 and NO3- microsensors. Depth profiles of nitrification (indicated as NO3- production), denitrification (indicated as NO3- consumption), and O2 consumption activities within the sediment were calculated
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47. Biosensor Determination of the Microscale Distribution of Nitrate, Nitrate Assimilation, Nitrification, and Denitrification in a Diatom-Inhabited Freshwater Sediment
High-resolution NO3− profiles in freshwater sediment covered with benthic diatoms were obtained with a new microscale NO3− biosensor characterized by absence of interference from chemical species other than NO2− and N2O. Analysis of the microprofiles obtained indicated no nitrification during darkness, high rates of nitrification and a tight coupling b
American Society for Microbiology.
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48. 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