Study of arsenic removal in drinking water at household level using solar oxidation and coagulation-flocculation techniques
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| Autores: | , , , , |
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| Formato: | artículo original |
| Estado: | Versión publicada |
| Data de Publicação: | 2015 |
| Descrição: | In Costa Rica, even though there have been efforts to provide safe water to communities affected by the presence of arsenic, there is a part of the population still exposed because might not be connected to a network of aqueducts. Two solutions household level use for As reduction are presented: one is the solar radiation oxidation (SORAS) and second one is the flocculation - coagulation process. Both solutions showed reduced As concentration due to adsorption or co-precipitation on the iron (III) oxide hydroxides. The SORAS system needed 2h and 4h of exposure in a sunny or cloudy day respectively to reduce the arsenic concentration from 200μg / L to less than the standard (10 ug / L). For coagulation - flocculation system, best conditions were achieved at pH 6 with synthetic flocculant FK-930-S (polymer polydiallyl-dimethylammonium chloride) at 1 mg/L dose and FeCl3 12 mg/L dose; for natural flocculant it was achieved at pH 6 with mozote (Triumfetta semitriloba) at 250 mg/L dose, and FeCl3 14 mg/L dose. A prototype consisting in a coagulation-flocculation container and a sand filtration step was able to treat 15 liters of synthetic water with 200μg / L As and natural water with 10 and 50 ug / L. Despite these results, it is necessary to evaluate both techniques in communities, including aspects of training and acceptance. |
| País: | Portal de Revistas TEC |
| Recursos: | Instituto Tecnológico de Costa Rica |
| Repositorio: | Portal de Revistas TEC |
| Idioma: | Español |
| OAI Identifier: | oai:ojs.pkp.sfu.ca:article/2443 |
| Acesso em linha: | https://revistas.tec.ac.cr/index.php/tec_marcha/article/view/2443 |
| Palavra-chave: | Agua de consumo humano remoción de arsénico oxidación solar floculación coagulación. Drinking water arsenic removal solar oxidation flocculation coagulation. |