Hydraulic conductivity and calcium carbonate content of biocemented heavy-metal contaminated mine waste soil

It is not uncommon for mining activity to generate wastes associated with negative engineering impacts include susceptibility runoff due the absence of vegetation, erosion, and sinkhole. Due their high degree permeability, movement heavy metal contaminants in waste soils aquifers occurs actively along hydrogeological parameters, research on using biocementation methods such as enzyme induced calcite precipitation (EICP) reduce hydraulic conductivity therefore beneficial. Mine soil collected from a copper mine Lohan Dam, Sabah characterized physically, morphologically, chemically then treated EICP under different operational parameters curing duration (1,3,7 days), temperatures (5, 10, 25 o C ), relative density (70 80 %). The was tested constant head permeability test calcium carbonate content (%) determined HCL washing method. Properties Dam are found be predominantly coarse grain low plasticity, specific gravity, acidic nature, organic content. Morphologically, they composed powdered hardened particles dark brown color amount irregular-shaped particles. Mineralogical, contain level metals beyond safety Department Environmental Malaysia. treatment had change ‘high medium’ ‘low’ 94-97% reduction corresponding produced ranging 6.94-9.63%. In conclusion, shows marginal effect, duration, temperature more significant impact effectiveness.