Abstract
The effect of calcium into coal fly ash on trace elements leaching concentration has been investigated through the addition of suppressing material. This study aims to provide the useful reference in controlling As leaching concentration into the environment. Suppressing material, as the by-product of other industries which contain high calcium, has been proven in decreasing of arsenic (As) leaching concentration from coal fly ash. There are three suppression materials that have been tested, that is: calcium hydroxide (Ca(OH)2), paper sludge ash (PS3) and filter cake (FC). Ca(OH)2 and PS3 show almost 85-90% decreasing in As leaching concentration based on ICP analysis. Moreover, the XPS analysis results show that calcium oxide (CaO) is consisting in PS3 and calcium carbonate is consisting in fly ash sample H.
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