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• W2337661258 abstract "Permeable reactive barriers (PRBs) are efficient and cost-effective systems for groundwater remediation. Different types of material have been tested as reactive media for constructing PRBs. To this purpose, the use of waste materials is of particular interest, provided they meet some permeability and reactivity requirements. In the present study, the use of granite powder, a waste generated during the process of cutting granite, was evaluated as a component of PRB filler, mixed in different proportions with compost. The Cr(VI) adsorption capacity and desorption behaviour of granite powder, pine bark compost, composted municipal solid waste and mixtures containing different proportions of granite powder and compost was compared. Individually, the granite powder was not suitable for use as PRB filler because of its moderate permeability and Cr(VI) adsorption capacity. The addition of pine bark compost increased the hydraulic conductivity and improved the Cr(VI) adsorption capacity of the material, while decreasing Cr desorption. In turn, the addition of compost derived from municipal solid waste did not have the same beneficial effect, as it decreased the hydraulic conductivity of the mixtures and only slightly improved the adsorption capacity. In summary, mixtures containing 50 or 25% granite powder and 50 or 75% pine bark compost (v/v), respectively, were the best materials for use as a PRB in relation to cost/effectiveness. RESUMEN Las barreras permeables reactivas (BPRs) son sistemas eficaces y de bajo coste para la descontaminacion de aguas subterraneas. Diversos materiales han sido ensayados como sustratos reactivos en la construccion de BPR’s, siendo de interes la utilizacion de materiales residuales cuando cumplen unos requisitos de permeabilidad y reactividad. En este trabajo se ha evaluado la utilizacion para este fin de serrines procedentes del proceso de corte del granito, mezclados con compost, como componentes de relleno de BPRs. Para ello, se estudio la capacidad de adsorcion de Cr(VI) de serrines graniticos, comparandola con la de compost de corteza de pino, compost de residuos solidos urbanos y mezclas en diferentes proporciones de los serrines y compost. Los serrines graniticos, empleados sin mezcla con otros componentes reactivos, presentan como inconveniente para su uso como relleno de BPRs su moderada permeabilidad y capacidad de adsorcion de Cr(VI). La adicion de compost de corteza de pino compostada mejoro el comportamiento de los serrines, incrementando su conductividad hidraulica, al tiempo que aumento la capacidad de adsorcion de Cr(VI) y disminuyo su desorcion. Por el contrario, el compost derivado de residuos solidos urbanos no tuvo estos efectos beneficiosos, ya que redujo la permeabilidad y solo afecto ligeramente a la capacidad de adsorcion y desorcion de Cr. En resumen, las mezclas de serrines graniticos y compost de corteza de pino al 50 o 75% (v/v) de compost fueron las mas adecuadas para su utilizacion como BPRs desde el punto de vista de su efectividad y coste." @default.
• W2337661258 created "2016-06-24" @default.
• W2337661258 creator A5028114217 @default.
• W2337661258 date "2014-01-01" @default.
• W2337661258 modified "2023-09-27" @default.
• W2337661258 title "Reutilization of granite powder as a component of permeable reactive barriers for the treatment of Cr(VI)-contaminated waters Reutilización de serrines graníticos como componente de barreras permeables reactivas para el tratamiento de aguas contaminadas con Cr(VI) Reutilização de pó de serragem de granito como componente de barreiras permeáveis reactivas para o tratamento de água contaminada com Cr(VI)" @default.
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