Study on the hydraulic ash-slag HASitious material(HAS) Solidification of dredged sludge

摘要

In this paper, the chemical composition ,the content and the teachability of heavy metals in dredged sludge are tested and analyzed. It is shown that the teachability of Pb and Cr exceeds the leaching toxicity standard, and so the dredged sludge is considered as hazardous waste and must be solidified. The effect of solidifying the dredged sludge by HAS is studied, and it indicates that the heavy metals can be well immobilized if the mass fraction of the dredged sludge is appropriate. The heavy metals are immobilized within HAS hydration products through either physical fixation, substitution,deposition or adsorption mechanisms.