Arsenic, chromium and mercury removal using mussel shell ash or a sludge/ashes waste mixture |
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Authors: | Natalia Seco-Reigosa Susana Peña-Rodríguez Juan Carlos Nóvoa-Muñoz Manuel Arias-Estévez María J Fernández-Sanjurjo Esperanza Álvarez-Rodríguez Avelino Núñez-Delgado |
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Institution: | 1. Departamento de Edafoloxía e Química Agrícola, Escola Politécnica Superior, University of Santiago de Compostela, Campus univ. s/n, 27002, Lugo, Spain 2. área de Edafoloxía e Química Agrícola, Departamento de Bioloxía Vexetal e Ciencia do Solo, Facultade de Ciencias, University of Vigo, 32004, Ourense, Spain
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Abstract: | Different batches of valued mussel shell and waste mussel shell ash are characterised. Shell ash has pH?>?12 and high electrical conductivities (between 16.01 and 27.27 dS?m?1), while calcined shell shows pH values up to 10.7 and electrical conductivities between 1.19 and 3.55 dS?m?1. X-ray fluorescence, nitric acid digestion and water extractions show higher concentrations in shell ash for most parameters. Calcite is the dominant crystalline compound in this ash (95.6 %), followed by aragonite. Adsorption/desorption trials were performed for mussel shell ash and for a waste mixture including shell ash, sewage sludge and wood ash, showing the following percentage adsorptions: Hg(II) >94 %, As(V) >96 % and Cr(VI) between 11 and 30 % for shell ash; Hg(II) >98 %, As(V) >88 % and Cr(VI) between 30 and 88 % for the waste mixture. Hg and As desorption was <5 % for both shell ash and the waste mixture, while Cr desorption was between 92 and 45 % for shell ash, and between 19 and 0 % for the mixture. In view of that, mussel shell ash and the mixture including shell ash, sewage sludge and wood ash could be useful for Hg(II) and As(V) removal. |
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