Abstract
Magnesium phosphate cement (MPC) is widely used to effectively stabilise/solidify heavy-metal-contaminated soils, and leachability is the most important parameter for MPC-treated metal-contaminated soil. However, various factors in the stabilisation/solidification (S/S) process, such as the metal concentration in the soil and the water-to-solid (W/S) ratio of the S/S paste treated using MPC, can greatly affect the leaching behaviour of heavy metal in S/S monolith. The toxicity characteristic leaching procedure (TCLP) and semi-dynamic leaching tests were conducted to investigate the effects of metal concentrations and W/S ratios on the leaching behaviours of MPC treated Pb contaminated soil. Results showed that the Pb concentration and W/S ratios change the leaching behaviours and leaching mechanisms of MPC-treated Pb-contaminated soil and the optimum W/S ratio 0.50 was obtained when MPC was used to stabilise Pb contaminated soils.
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