Stabilization/solidification of lead-contaminated soil using cement and rice husk ash.
This paper presents the findings of a study on solidification/stabilization (S/S) of lead-contaminated soil using ordinary Portland cement (OPC) and rice husk ash (RHA). The effects of varying lead concentrations (in the form of nitrates) in soil samples on the physical properties of their stabilized forms, namely unconfined compressive strength (UCS), setting times of early mixtures and changes in crystalline phases as well as chemical properties such as leachability of lead, pH and alkalinity of leachates are studied. Results have indicated that usage of OPC with RHA as an overall binder system for S/S of lead-contaminated soils is more favorable in reducing the leachability of lead from the treated samples than a binder system with standalone OPC. On the other hand, partial replacement of OPC with RHA in the binder system has reduced the UCS of solidified samples.
Yin
Chun-Yang
CY
Faculty of Chemical Engineering, Universiti Teknologi MARA, 40450 Shah Alam, Selangor Darul Ehsan, Malaysia. yinyang@streamyx.com
Mahmud
Hilmi Bin
HB
Shaaban
Md Ghazaly
MG
D000468:Alkalies / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007854:Lead / Q000032:analysis* / Q000737:chemistry; D009566:Nitrates / Q000737:chemistry; D012275:Oryza / Q000737:chemistry; D044367:Phase Transition; D012989:Soil Pollutants / Q000737:chemistry*; D013997:Time Factors; D018505:Waste Management; D014961:X-Ray Diffraction
D000468:Alkalies; D009566:Nitrates; D012989:Soil Pollutants; D007854:Lead; C017461:lead nitrate