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Abstract
In this work, the removal of arsenic from aqueous solution by using FeSO4 with CaCO3 was investigated. Arsenic removal was significantly improved in the presence of CaCO3, compared with Ca(OH)2, giving an arsenic removal rate of 99.64% with the Fe/As molar ratio of 2:1 and Ca/Fe molar ratio of 1.5:1. With both FeSO4+Ca(OH)2 (FSCH) and FeSO4+CaCO3 (FSCC), several analytical methods including SEM-EDS, XRD, FTIR, and TG-DSC etc. were performed to characterize the sediments. The sediment from FSCC has much larger particle size, six time faster filtration speed and only one-third volume compared with that from traditional FSCH, allowing a very easy handling of the precipitate sludge, another clear advantage of using CaCO3. Moreover, much less fine and sticky CaSO4 was generated in the FSCC sludge than that from FSCH.
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