Abstract

VARGAS-NIETO, C; CARRIAZO, J. G  and  CASTILLO, E. A study of low low-cost adsorbent ma- materials for removing Cr(VI) from terials aqueous waste effluent. Ing. Investig. [online]. 2011, vol.31, n.1, pp.154-162. ISSN 0120-5609.

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.

Keywords : Chromium removal; chromium adsorption; waste water treatment; adsorption on compost; adsorption on alumina.

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