Solidification/Stabilization of waste containing lead using flyash and bentonite

Abstract

In this study, the Stabilization/Solidification was used to treat Pb as heavy metal waste using flyash and bentonite, as binder and mixing agent. Flyash and bentonite was mixed with the waste containing Pb and formed to cube called “mortar” with a size of 5x5x5 cm. The variations of flyash and bentonite were 100:0, 90:10, 80:20, 70:30, 60:40, 50:50, 40:60, 30:70, 20:80, 10:90, and 0:100. Then the mortars had a curing time process for 7 days, 14 days, and 28 days. After curing time process, the products tested using a compressive strength test and TCLP test. Result of compressive strength test indicated that the optimum compressive strength value occurred in 100% fly ash composition with 28 days curing time. The estimation of compressive strength test was 3220 tons/m2. The result of the TCLP test showed the optimum TCLP test results occurred at 100% fly ash composition and the rate was 0,0338 mg/L Pb. The composition of fly ash and bentonite showed a significant effect on the compressive strength and TCLP test.