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Korean Journal of Chemical Engineering,
Vol.34, No.12, 3150-3155, 2017
Vol.34, No.12, 3150-3155, 2017
Effects and optimization of initial pH and sewage sludge compost content on leaching of lead and zinc in contaminated soil
We investigated the effects of initial pH (2≤pH0≤6) and sewage sludge compost content (5≤[SSC]≤25 g/ kg) on leaching characteristics of lead (Pb) and zinc (Zn) in contaminated field soil. pH0 and [SSC] significantly affected the leaching of Pb and Zn in soils contaminated with them. The pH in the solution increased as reaction time and [SSC] increased. The leached amounts of Pb and Zn were highest at pH0=2 and increased with reaction time. As [SSC] increased, the leached amount of Pb decreased (50.4mg/kg at control condition ([SSC]=0 g/kg); 22.9mg/kg at [SSC]=25 g/kg at pH0=2) and the leached amount of Zn increased (20.1mg/kg at [SSC]=0 g/kg; 31.7mg/kg at [SSC]=25 g/kg at pH0=2). The change increased as pH0 decreased. Within the design boundaries, minimum leaching of Pb (14.7mg/kg) occurred at pH0=5.1 and [SSC]=25 g/kg, and minimum leaching of Zn (5.0mg/kg) occurred at pH0=5.1 and [SSC]=5 g/kg.
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