Optimization of Solidification and Stabilization Efficiency of Heavy Metal Contaminated Sediment Based on Response Surface Methodology

Solidification and stabilization (S/S) by agents stabilizers is an effective way to treat heavy metal-contaminated sediments. Optimization of curing condition crucial minimize the consumption reagents on base S/S. In this work, synergistic effects cement stabilizer mechanical strength leaching toxicity contaminated sediments were investigated, S/S conditions optimized using response surface methodology. On basis a single-factor test, multi-factor experiments conducted fit relationship between effect amount stabilizer. The mechanism was investigated results from revised BCR method. indicate that optimal 44.29% content with 2.05% trimercapto-s-triazine trisodium salt (TMT). After 28 days curing, compressive reached 2.07 MPa concentrations Cd, Cu, Pb 0.094 mg/L, 0.031 0.173 respectively, which met requirement in-situ resource recycling standard. stability metals significantly improved as result removal acid extractable fraction (15.58~69.92%) increase in residual (18.27~49.07%).