Abstract
In this study, Polycyclic Aromatic hydrocarbons (PAHs) contaminated soil were collected from Ray Petrochemical industry and treated by Solidification/Stabilization (S/S) which is an effective technique for reducing the leachability of contaminants in soils. Since organic compounds interfere with cement hydration process, S/S technology will have difficulties while trying to immobilize organic contaminants. The treatment process was conducted using Portland Cement (PC) as the main binder and Microsilica (MS) as an additive to improve the effect of PC in immobilization of organic contaminants. Specimens were divided in two groups with constant cement percentage of 25% and 35%. Each group were again divided to three subgroups with 0%, 4% and 8% of MS. The efficiency of using MS in leaching behaviour of S/S samples was assessed by toxicity characteristic leaching procedure (TCLP). Lowest leach percentage of 14.66% for total PAHs in the paste contained 25% of cement and 8% of MS were obtained. The results indicated that the presence of MS in cement pastes had positive effect on reduction in concentration of contaminant in leachate.
Highlights
In this study, Polycyclic Aromatic hydrocarbons (PAHs) contaminated soil were collected from Ray Petrochemical industry and treated by Solidification/Stabilization (S/S) which is an effective technique for reducing the leachability of contaminants in soils
United States Environmental Protection Agency (USEPA) named 16 different compounds of PAHs as priority pollutants according to their carcinogenicity and mutagenicity at very low concentrations[3, 4]
Since organic compounds interfere with cement hydration process, S/S technology could be run into difficulties when trying to immobilize organic contaminants[12, 13]
Summary
Polycyclic Aromatic hydrocarbons (PAHs) contaminated soil were collected from Ray Petrochemical industry and treated by Solidification/Stabilization (S/S) which is an effective technique for reducing the leachability of contaminants in soils. Since organic compounds interfere with cement hydration process, S/S technology will have difficulties while trying to immobilize organic contaminants. USEPA documented S/S method as the Best Demonstrated Available Technology (BDAT) for the land disposal of the majority toxic and hazardous substance 6-8 It is one of the most regular remediation processes used at Superfund sites in the U.S (about 24% of the sites applied this method between 1982 and 2002)[8, 9], and it has been known as one of the most cost effective techniques[10, 11].The stabilization stands for a process that is convert contaminants into forms that are much less mobile, soluble, and toxic[8, 11]. It’s amorphous structure, high SiO2 content, and large surface area makes it reactive with calcium hydroxide produced by cement hydration[15,16,17]
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