Abstract
Lime neutralization of acidic wastewater from a lead-acid battery industry produces lead contaminated gypsum sludge. An earlier study of the authors had focused on re-using this gypsum sludge without chemical stabilization to manufacture non-load bearing gypsum blocks. Un-stabilized gypsum blocks however have poor resistance to moisture. This study examines the feasibility of improving moisture resistance, increasing the compressive strength and lowering the rate of contaminant release through chemical stabilization of the gypsum sludge with Portland cement. Experimental results demonstrate that partial replacement of river sand by gypsum sludge in cement stabilized pressed blocks (CSPB) is a feasible route to achieve these objectives.
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