Stabilization of Incinerator Ash with High Chromium(VI) Content

Abstract

A laboratory procedure was developed and verified for neutralizing highly toxic ash from incinerators that contain extreme quantities of soluble hexavalent chromium by means of stabilization/solidification with an asphalt binder. Relevant parameters of stabilizate leachability approach zero values, so that prepared stabilizate forms an inert, environmentally stable material. The volume of processed waste is noticeably reduced during stabilization. The mechanism of stabilization consists in creating a perfect impermeable barrier against leaching with water. Using simulated waste with added trivalent chromium salt, the versatility of the developed procedure was proven, producing perfect stabilization of both anionic and cationic forms of chromium.