Um modelo de implementação para educação a distância com base no projeto político-pedagógico

Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnlógico. Programa de Pós-Graduação em Ciência da Computação.Este trabalho tem como objetivo criar um modelo de implementação para Educação a Distância que forneça aos coordenadores e responsáveis uma simulação dos recursos que poderão ser utilizados, baseada na análise de viabilidade oriunda do projeto político-pedagógico. Com isto, podem fazer as devidas análises, para identificar os recursos mais significativos e suas adequações, possibilitando o oferecimento do curso efetivamente. O referencial teórico aborda conceitos, comentários e tecnologias para a educação a distância, bem como de ergonomia de interface homem-máquina e web design, este voltado para o desenvolvimento de páginas para a internet. Um protótipo foi implementado para ilustrar sua viabilidade

DEVELOPMENT AND EVALUATION OF A COLUMNAR ION EXCHANGE SYSTEM USING MICROENCAPSULATED MAGNETIC RESIN

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Treating Laguna de Bay water to Philippine National Standards for drinking water with high-performance membranes

The demand for reliable water supplies has been growing for years and is increasingly urgent in the Philippines. Using membrane technology, difficult-to-treat water sources are now viable water supply options. Hollow-fiber microfiltration (MF) membrane systems are especially effective in treating surface water supplies such as lakes, rivers, and reservoirs and are now used to supplement or to replace conventional water treatment technologies, e.g., rapid-mix, coagulation, sedimentation, and multimedia filtration. These low-pressure polymeric hollow-fiber membrane systems are used globally to treat surface and groundwaters for drinking water. High-quality drinking water (turbidity<0.1 NTU) can be assured by MF membranes, which effectively remove Cryptosporidium and Giardia and exceed United States EPA Surface Water Treatment Rule (SWTR) logremoval requirements. Hollow-fiber MF membrane systems made of the fluorocarbon polyvinylidenefluoride (PVDF) provide comprehensive oxidant compatibility that allows the oxidation and subsequent removal of iron and manganese. Taste and odor compounds are oxidized or removed by coagulants or powdered activated carbon. Automated integrity test procedures assure long-term membrane reliability. Low-pressure microfiltration technology is combined with reverse osmosis that removes dissolved solids caused by saltwater intrusion into the lake. This combined membrane system provides drinking water that surpasses the stringent water purity specifications of the Philippine National Standards for Drinking Water. Membrane systems can consistently produce drinking water with turbidity below 0.1 NTU, independent of feed water quality. This paper discusses design considerations for a custom-designed integrated membrane system combining hollow-fiber membrane technology with reverse osmosis to produce 100 million liters per day of potable and palatable drinking water (Fig.1)

Pilot Study of a Low-Pressure Membrane System Treating Surface Water of the Qiantang River

To meet increasingly stringent drinking water regulations and to accommodate worsening water quality due to pollution, a large water company in southeast China evaluated hollow fiber membrane technology to upgrade one of its water treatment plants. Pilot studies using a Pall microfiltration (MF) unit were performed to provide information for the process design of the plant. Low-pressure membranes (microfiltration and ultrafiltration) were determined to be cost-effective and reliable technology to integrate into the existing treatment plant. The results of the pilot studies indicate that pretreatment had a strong impact on membrane performance. Three different pretreatment trains were tested. The treatment train consisting of coagulation – sedimentation – GAC filter proved to be the most effective based on the rate of increase in trans-membrane pressure (TMP). Water quality monitoring at the various points of the treatment train indicated excellent removal of fecal coliforms and oxidized (iron and manganese) by MF, and NH3 reduction via nitrification in GAC filters. These data demonstrated that low-pressure microfiltration membrane can be effectively integrated with traditional treatment processes to provide high quality water regardless of raw water quality.</jats:p