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Limestone as a sustainable remediation option for water contaminated with fluoride.

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Title: Limestone as a sustainable remediation option for water contaminated with fluoride.
Authors: Labastida, I.1 iln@correo.azc.uam.mx, Armienta, M.A.2 victoria@geofisica.unam.mx, Beltrán, M.1, Caballero, G.1, Romero, P.1, Rosales, M.A.3
Source: Journal of Geochemical Exploration. Dec2017 Part B, Vol. 183, p206-213. 8p.
Subjects: Limestone -- Environmental aspects, Environmental remediation, Water pollution, Fluorides -- Environmental aspects, Adsorption isotherms
Abstract: This manuscript reports on batch and column water-treatment experiments to remove fluoride using limestones from various geological rock formations (KIT1, KIT2, and KSS). The experiments evaluated removal efficiency and its relation with CaCO 3 content and particle size (63–125 μm, 300–600 μm, and 840–1410 μm). The results showed an efficient removal ability between 60% and 65%, which indicates that these materials may be used to treat fluoride-contaminated water or as part of a treatment system. The physico-chemical conditions for fluorite formation and precipitation were also evaluated, due to the natural presence of the F − /CaCO 3 geochemical system. Possible removal mechanisms were evaluated through adsorption isotherms, saturation index (SI) calculations, and precipitation experiments within F − /Ca 2 + systems. The concentration profiles along the columns with time indicated the occurrence of various sorption/desorption processes that may involve the formation of external sphere complexes. Batch experiments carried out to evaluate adsorption and feasibility of fluorite precipitation showed that the F − /CaCO 3 ratio may be used to explain the removal mechanisms and the precipitation of CaF 2 formation that occur in bulk solutions. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:This manuscript reports on batch and column water-treatment experiments to remove fluoride using limestones from various geological rock formations (KIT1, KIT2, and KSS). The experiments evaluated removal efficiency and its relation with CaCO 3 content and particle size (63–125 μm, 300–600 μm, and 840–1410 μm). The results showed an efficient removal ability between 60% and 65%, which indicates that these materials may be used to treat fluoride-contaminated water or as part of a treatment system. The physico-chemical conditions for fluorite formation and precipitation were also evaluated, due to the natural presence of the F − /CaCO 3 geochemical system. Possible removal mechanisms were evaluated through adsorption isotherms, saturation index (SI) calculations, and precipitation experiments within F − /Ca 2 + systems. The concentration profiles along the columns with time indicated the occurrence of various sorption/desorption processes that may involve the formation of external sphere complexes. Batch experiments carried out to evaluate adsorption and feasibility of fluorite precipitation showed that the F − /CaCO 3 ratio may be used to explain the removal mechanisms and the precipitation of CaF 2 formation that occur in bulk solutions. [ABSTRACT FROM AUTHOR]
ISSN:03756742
DOI:10.1016/j.gexplo.2016.12.001