Effects and optimization of initial pH and sewage sludge compost content on leaching of lead and zinc in contaminated soil

초록

We investigated the effects of initial pH (2ae<currency>pH(0)ae<currency>6) and sewage sludge compost content (5ae<currency>[SSC]ae<currency>25 g/kg) on leaching characteristics of lead (Pb) and zinc (Zn) in contaminated field soil. pH(0) 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 pH(0)=2 and increased with reaction time. As [SSC] increased, the leached amount of Pb decreased (50.4 mg/kg at control condition ([SSC]=0 g/kg); 22.9 mg/kg at [SSC]=25 g/kg at pH(0)=2) and the leached amount of Zn increased (20.1 mg/kg at [SSC]=0 g/kg; 31.7 mg/kg at [SSC]=25 g/kg at pH(0)=2). The change increased as pH(0) decreased. Within the design boundaries, minimum leaching of Pb (14.7 mg/kg) occurred at pH(0)=5.1 and [SSC]=25 g/kg, and minimum leaching of Zn (5.0 mg/kg) occurred at pH(0)=5.1 and [SSC]=5 g/kg.

키워드