Browsing by Autor "Filip Tack"

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    An investigation on the modelling of kinetics of thermal decomposition of hazardous mercury wastes
    (Elsevier BV, 2013) Y. Busto; Filip Tack; Luis Mario Floría Peralta; X. Cabrera; Luis E. Arteaga‐Pérez
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    Arsenic in drinking water wells on the Bolivian high plain: Field monitoring and effect of salinity on removal efficiency of iron-oxides-containing filters
    (2010) K. Van Den Bergh; Gijs Du Laing; Juan Carlos Montoya; Eric de Deckere; Filip Tack
    In the rural areas around Oruro (Bolivia), untreated groundwater is used directly as drinking water. This research aimed to evaluate the general drinking water quality, with focus on arsenic (As) concentrations, based on analysis of 67 samples from about 16 communities of the Oruro district. Subsequently a filter using Iron Oxide Coated Sand (IOCS) and a filter using a Composite Iron Matrix (CIM) were tested for their arsenic removal capacity using synthetic water mimicking real groundwater. Heavy metal concentrations in the sampled drinking water barely exceeded WHO guidelines. Arsenic concentrations reached values up to 964 μ g L⁻¹ and exceeded the current WHO provisional guideline value of 10 μ g L⁻¹ in more than 50% of the sampled wells. The WHO guideline of 250 mg L⁻¹ for chloride and sulphate was also exceeded in more than a third of the samples, indicating high salinity in the drinking waters. Synthetic drinking water could be treated effectively by the IOCS- and CIM-based filters reducing As to concentrations lower than 10 μ g L⁻¹. High levels of chloride and sulphate did not influence As removal efficiency. However, phosphate concentrations in the range from 4 to 24 mg L⁻¹ drastically decreased removal efficiency of the IOCS-based filter but had no effects on removal efficiency of the CIM-based filter. Results of this study can be used as a base for further testing and practical implementation of drinking water purification in the Oruro region.
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    Caracterización de sustratos de filtros de suelo plantados: Influencia en la depuración de aguas residuales
    (2011) Maira María Pérez Villar; Elena Rosa Domínguez; Filip Tack; Anneris Vandemoortel
    Se determinaron diferentes parametros (pH, Conductividad electrica, Materia organica, Carbono total, Capacidad de intercambio cationico, Nitrogeno total, Nitrogeno amoniacal y Fosforo total), en los dos tipos de suelos antes y despues de ser utilizados como sustratos en el filtro, el analisis de los metales se realizo por espectrometria de emision atomica y se utilizo el software statgraphics centurion XV.II para el tratamiento estadistico. Se obtuvieron diferencias significativas entre los sustratos antes y despuesde ser utilizados en el experimento para el fosforo y el nitrogeno amoniacal, observandose un incremento del fosforo y una disminucion del Nitrogeno amoniacal, mientras que la concentracion de Nitrogeno total se mantuvo practicamente constante antes y despues del experimento. Los valores de pH y conductividad electrica mostraron una disminucion en los suelos despues de ser utilizados como sustrato de los filtros, mientras que la materia organica, el contenido de carbonato y la capacidad de intercambio cationico no sufrieron variacion. Se concluye que el alto contenido de hierro en el suelo ferralitico rojo favorece la absorcion de fosforo y que ocurren reacciones de nitrificacion en el filtro por la disminucion del nitrogeno amoniacal en ambos sustratos.