| Abstract | The worldwide mining industry produces millions of tons of rock wastes, raising a considerable burden for managing both economic and environmental issues. The possible reuse of Fe/Mn-rich materials for arsenic removal in water filtration units, along with rock properties, was evaluated. By characterizing and testing 47 samples collected from the Joda West Iron and Manganese Mine in India, we found As removal up to 50.1% at 1 mg/L initial As concentration, with a corresponding adsorption capacity of 0.01-0.46 mgAs/g mining waste. The As removal potential was strictly related to spectral, mineralogical, and elemental composition of rock wastes. Unlike rock crystallinity due to quartz and muscovite, the presence of hematite, goethite, and kaolinite, in association with the amorphous fractions of Fe and Al, enhanced the As adsorption. The natural content of arsenic indicated itself the presence of active sorptive sites. The co-occurrence of sitespecific competitors (i.e., phosphate) represented a consequent limitation, whereas the content of Ce, Cu, La, and Pb contributed positively to the As adsorption. Finally, we proposed a simplified multiple linear model as predictive tool to select promising rock wastes suitable for As removal by water filtration in similar mining environments: As predicted = 0.241 + 0.00929[As] + 0.000424[La] + 0.000139[Pb] - 0.00022[P]. |
| Text | 412579 2019 10.3390/w11091897 Scopus 2 s2.0 85072198918 ISI Web of Science WOS WOS 000488834400160 mining wastes iron and manganese minerals water filtration arsenic adsorption Mining rock wastes for water treatment Potential reuse of Fe and Mn rich materials for arsenic removal Casentini B.; Lazzazzara M.; Amalfitano S.; Salvatori R.; Guglietta D.; Passeri D.; Belardi G.; Trapasso F. Water Research Institute, National Research Council of Italy IRSA CNR , Via Salaria km 29.300, 00015 Monterotondo, Rome, Italy Institute of Atmospheric Pollution, Italian National Research Council IIA CNR , Via Salaria km 29.300, 00015 Monterotondo, Rome, Italy Institute of Environmental Geology and Geoengineering, Italian National Research Council IGAG CNR , Via Salaria km 29.300, 00015 Monterotondo, Rome, Italy The worldwide mining industry produces millions of tons of rock wastes, raising a considerable burden for managing both economic and environmental issues. The possible reuse of Fe/Mn rich materials for arsenic removal in water filtration units, along with rock properties, was evaluated. By characterizing and testing 47 samples collected from the Joda West Iron and Manganese Mine in India, we found As removal up to 50.1% at 1 mg/L initial As concentration, with a corresponding adsorption capacity of 0.01 0.46 mgAs/g mining waste. The As removal potential was strictly related to spectral, mineralogical, and elemental composition of rock wastes. Unlike rock crystallinity due to quartz and muscovite, the presence of hematite, goethite, and kaolinite, in association with the amorphous fractions of Fe and Al, enhanced the As adsorption. The natural content of arsenic indicated itself the presence of active sorptive sites. The co occurrence of sitespecific competitors i.e., phosphate represented a consequent limitation, whereas the content of Ce, Cu, La, and Pb contributed positively to the As adsorption. Finally, we proposed a simplified multiple linear model as predictive tool to select promising rock wastes suitable for As removal by water filtration in similar mining environments As predicted = 0.241 0.00929 As 0.000424 La 0.000139 Pb 0.00022 P . 11 Published version https //www.mdpi.com/2073 4441/11/9/1897 Full text water 11 01897 v2.pdf Articolo in rivista Molecular Diversity Preservation International 2073 4441 Water Basel Water Basel Water Basel Water. Basel rosamaria.salvatori SALVATORI ROSAMARIA girolamo.belardi BELARDI GIROLAMO stefano.amalfitano AMALFITANO STEFANO barbara.casentini CASENTINI BARBARA daniela.guglietta GUGLIETTA DANIELA francesca.trapasso TRAPASSO FRANCESCA daniele.passeri PASSERI DANIELE |
