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A study of low-cost adsorbent materials for removing Cr(VI) from aqueous waste effluent
Estudio de materiales adsorbentes de bajo costo para remover Cr(VI) de efluentes acuosos
DOI:
https://doi.org/10.15446/ing.investig.v31n1.20537Keywords:
Chromium removal, chromium adsorption, waste water treatment, adsorption on compost, adsorption on alumina. (en)remoción de cromo, adsorción de cromo, tratamiento de aguas residuales, adsorción sobre compost, adsorción sobre alúmina. (es)
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The present paper shows very high potential for two types of solid (a commercial alumina and material obtained by composting, i.e. matured compost) on Cr(VI) adsorption/ elimination in aqueous solution using a concentration range close to those previously detected in waste-water from Colombian industries. Both had important properties for eliminating Cr(VI), the compost being more important as it represents low-cost material. Optimal conditions for chromium adsorption on alumina and compost were established. Initial Cr(VI) alumina concentration was 10 mgL-1, with 100 mL/g volume of solution per adsorbent mass, pH=2.0, 1-hour equilibrium time and 150 rpm stirring. For compost, initial Cr(VI) concentration was = 3 mg L-1, 50 mL/g volume of solution per adsorbent mass, pH=2.5, 3-hour equilibrium time and 150 rpm stirring. The experiments showed that compost adsorption properties could be enhanced by adding small quantities of alumina. Compost could thus be chosen as a promising material for use in bioremediation chromium-containing waste water in a management programme for using solid waste in for minimising environmental impact.
El presente estudio muestra el enorme potencial de dos tipos de sólidos diferentes, una alúmina comercial y un material producto del compostaje, en la adsorción/eliminación de Cr(VI) en medio acuoso, en concentraciones de metal equivalentes a las halladas en aguas residuales provenientes de industrias en Colombia. Ambos materiales mostraron propiedades importantes para la eliminación de Cr(VI), considerándose de mayor relevancia el compost por ser un material de bajo costo. Se establecieron las condiciones óptimas para la adsorción de cromo sobre alúmina y sobre compost. Para la alúmina: concentración inicial de Cr(VI) = 10 mgL-1, volumen de solución por masa de adsorbente = 100 mL/g, pH = 2,0, tiempo de equilibrio = 1 hora, y agitación = 150 rpm. Para el compost: concentración inicial de Cr(VI) = 3 mg L-1, volumen de solución por masa de adsorbente = 50 mL/g, pH = 2.5, tiempo de equilibrio = 3 horas, y agitación = 150 rpm. Además, los resultados mostraron que las propiedades de adsorción del compost se pueden mejorar mediante la adición de pequeñas cantidades de alúmina. El estudio permitió seleccionar al compost como un material promisorio para procedimientos de remediación de aguas residuales que contienen cromo (VI) dentro de una política de manejo y uso de residuos sólidos con el objeto de minimizar el impacto ambiental de éstos.
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Copyright (c) 2011 Claudia Vargas-Niño, José Gregorio Carriazo, Elianna Castillo Serna
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