Study on leaching of heavy metal contaminated sediment with temperature-sensitive hyperbranched polymer
Hyperbranched polyglycidyl glycerin was synthesized with trimethylopropane as core and glycidyl as polymeric monomer,and then n-caprylic acid was added for surface modification to obtain a series of thermosensitive hyperbranched polymers.The third generation polymer HPG-33 was selected to study its effect on the remediation of heavy metal contaminated sludge by oscillating method.The results showed that the removal rate of heavy metals was positively correlated with the molecular weight of the polymer.When the concentration was 15mmol/L,the solid-liquid ratio was 1∶10,the leaching time was 4h,and the pH was 4,the removal rates of Cd,Cu and Pb could reach 76.33％,86.72％and 49.86％,respectively.And the prepared polymer eluent will not destroy the pH,agglomerate structure,intemal mineral lattice and so on.
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