Abstract
Abstract This study focuses on the investigation regarding impact of Ba2+ and Cd2+ on defluoridation by calcite because Spent Pot Lining (SPL, a byproduct generated during the aluminum production) leachate is a complex chemical cocktail. To better understand defluoridation processes and replicate the situation in the field, column tests were conducted. Results indicate that presence of neither Ba2+ nor Cd2+ has significant impact on fluoride retention when compared with the blank (no metals) because the relative concentration values (F/Fo) as well as the transport parameters like retardation factor (Rc) and distribution coefficient (Kd) are almost the same. PHREEQC, a geochemical software, was then applied to simulate the column test processes (i.e., 1D reactive/transport processes) based on the mechanism of CaF2 precipitation followed after calcium dissolution. As indicated in the batch reactor test, addition of Cd2+ may inhibit calcite dissolution; therefore, a new phase “CalciteSupp” (a phase represent...
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