Encontrados 12 documentos, a visualizar página 1 de 2
Anaerobic biodegradability of category 2 animal by-products : methane potential...
Pozdniakova, T. A.; Costa, J. C.; Santos, R. J.; Alves, M. M.; Boaventura, Rui A. RochaCategory 2 animal by-products that need to be sterilized with steam pressure according Regulation (EC) 1774/2002 are studied. In this work, 2 sets of experiments were performed in mesophilic conditions: (i) biomethane potential determination testing 0.5%, 2.0% and 5.0% total solids (TS), using sludge from the anaerobic digester of a wastewater treatment plant as inoculum; (ii) biodegradability tests at a consta...
Pollutant dispersion modelling for Portuguese river water uses protection linke...
Duarte, António A. L. Sampaio; Boaventura, Rui A. RochaMathematical models are well known as useful tools for water management practices, directly or indirectly related to the implementation of the Water Framework Directive (WFD) in European countries. They can be applied to solve or understand either simple water quality problems or complex water management problems of trans-boundary rivers or multiple-purpose and stratified reservoirs. Accidental spills of pollut...
Dispersion modelling in rivers for water sources protection, based on tracer ex...
Duarte, António A. L. Sampaio; Boaventura, Rui A. RochaJudicious selection of mathematical models for application in a specific river basin management can mitigate prediction uncertainty. Therefore, intervention times will be established with better reliability and alarm systems could efficiently protect the aquatic ecosystems and the public health. The main purpose of this paper is to evaluate the performance of river water systems dispersion modelling, based on t...
Modelação da dispersão longitudinal em sistemas fluviais : casos de estudo
Duarte, António A. L. Sampaio; Pinho, José L. S.; Vieira, J. M. Pereira; Boaventura, Rui A. RochaO estudo da hidrodinâmica e dispersão de descargas poluentes em sistemas fluviais assume particular relevância no estabelecimento de esquemas de gestão integrada da água em bacias hidrográficas, visando a protecção dos ecossistemas aquáticos e tendo em consideração os usos aí existentes. O presente trabalho teve como objectivo a determinação de parâmetros capazes de traduzir as características dispersivas em tr...
Modelação da hidrodinâmica e da dispersão longitudinal no rio Mondego
Duarte, António A. L. Sampaio; Pinho, José L. S.; Boaventura, Rui A. Rocha; Vieira, J. M. PereiraA selecção criteriosa de modelos atemáticos, a aplicar numa bacia específica, pode mitigar a incerteza na previsão de tempos de intervenção, aumentando a eficiência dos sistemas de protecção desses ecossistemas aquáticos. O presente trabalho teve como objectivos a determinação de parâmetros capazes de traduzir as características de dispersão num trecho do rio Mondego e a avaliação do desempenho de diferentes té...
Tracer experiments for dispersion modelling in river Douro water quality manage...
Duarte, António A. L. Sampaio; Pinho, José L. S.; Vieira, J. M. Pereira; Boaventura, Rui A. RochaParameters estimation for in situ dispersion river water behaviour characterisation, and performance evaluation of numerical models, applied to reproduce data field obtained from dye tracer experiments, were the main purposes of this research work. A monitoring program was carried out using tracer injection to assess the environmental impact of accidental pollutant discharges in an international reach of river ...
Aluminum recovery from water treatment sludges
Boaventura, Rui A. Rocha; Duarte, António A. L. Sampaio; Almeida, Manuel F.Aluminum sulfate and polyaluminum chloride are widely used as coagulants in water treatment plants. A chemical sludge containing aluminium hydroxide, adsorbed organic matter and other water insoluble impurities is obtained after the flocculation-clarification process. In Portugal, an estimated amount of 66 000 ton/yr. (wet wt.) water treatment sludge is being disposed of on land or at municipal solid waste (MSW...
Estudo das características dispersivas duma albufeira do rio Douro internacional
Duarte, António A. L. Sampaio; Pinho, José L. S.; Vieira, J. M. Pereira; Boaventura, Rui A. RochaO estudo da hidrodinâmica e dispersão de descargas poluentes em sistemas fluviais assume particular relevo na definição de esquemas de gestão integrada das bacias hidrográficas, nomeadamente quanto à protecção da qualidade da água nas origens. O presente trabalho teve como objectivo a determinação de parâmetros característicos de dispersão na albufeira de Miranda do Douro. Para esse efeito foram realizadas cam...
Comparision of numerical techniques solving longitudinal dispersion problems in...
Duarte, António A. L. Sampaio; Pinho, José L. S.; Vieira, J. M. Pereira; Boaventura, Rui A. RochaJudicious selection of mathematical models for application in a specific river basin management can mitigate prediction uncertainty. Therefore, intervention times will be established with better reliability and alarm systems could efficiently protect the aquatic ecosystems and the public health. The main purpose of this paper is to evaluate the performance of different numerical techniques when applied to river...
A contribution to drinking water sources protection strategies in a portuguese ...
Vieira, J. M. Pereira; Duarte, António A. L. Sampaio; Pinho, José L. S.; Boaventura, Rui A. RochaThe need and growing interest on raw water sources protection is a great concern in river basin planning and management. Problems related to drinking water sources can range from shortage of water to water quality degradation mainly due to intensive urbanisation and industrial policies as well as uncontrolled agricultural practices. The river Cavado basin, located in the north-western region of Portugal, has a...
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