| Summary: | Petroleum sludge is formed during refinery process in petroleum industry. This sludge is characterized as one of hazardous waste, which cannot be disposed directly to landfill and needs to be treated before disposal. In this study, solidification and stabilization method (S/S) was used to treat heavy metals in the sludge. Palm oil fuel ash (POFA) and quarry dust (QD) was used as binders. Both binders were compared based on compressive strength and leaching behavior. Three different ratios of binder were selected in this study, namely, 10%, 20% and 30% and all ratios were tested for 7 days and 28 days by air curing. The strength was measured by using Automatic Compression Testing Machine 3000kN ASTM. The leaching behavior was tested by using toxicity characteristic leaching procedure (TCLP). The leaching of heavy metals concentrations were analysed by using Inductively Coupled Plasma Mass Spectrometry (ICP-MS). The selected heavy metals in this study are chromium (Cr), nickel (Ni), Copper (Cu), zinc (Zn), Arsenic (As), barium (Ba) and lead (Pb). From the result, the highest strength, 5.3 MPa was detected for ratio of 15% POFA. Based on leaching test, different heavy metals show different concentration. Cu, Cr, Ni and As show the lowest concentration for 20% POFA, i.e. 0.0072 ppm, 0.0211 ppm, 0.0766 ppm and 0.0008 ppm, respectively. Other metals, Zn, Pb and Ba shows lowest concentration for 10% POFA, 10% QD and 15% QD, 0.012 ppm, 0.0007 ppm and 0.2443 ppm, respectively. As conclusion, by comparison of both binder POFA shows better result in strength and leaching test. © 2023 American Institute of Physics Inc.. All rights reserved.
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