Effect of Fe-based substance on Cr leaching behavior in hazardous waste incineration fly ash after thermal treatment.

This study investigated the influence of the interaction between Fe-based substances and thermal treatment parameters on the leaching behavior of Cr in hazardous waste incineration fly ash (HWIFA) after thermal treatment. The results revealed that the interaction between the addition of Fe-based substance and the thermal treatment parameters and their effects on static and dynamic leaching behaviors of Cr had significant differences when FeO, FeO, and Fe were added, respectively. Specifically, when FeO or Fe was added, the thermal treatment temperature was the most significant factor affecting the static leaching of Cr in thermal treated HWIFA, and the interaction effect of other factors was not significant.

Transformation and leaching behavior of Pb in hazardous waste incineration fly ash after thermal treatment with addition of FeO.

This study investigated the leaching behavior of Pb in hazardous waste incineration fly ash (HWIFA) after adding FeO thermal treatment and revealed the leaching mechanism of Pb from the perspective of phase transformation. The static leaching results showed that at 600 °C-1300 °C, with the addition of FeO increased, the Pb leaching toxicity continued to decrease. The dynamic results indicated that as the thermal treatment temperature was higher than 1100 °C, the addition of FeO can effectively inhibit the dynamic leaching of Pb in HWIFA.

Effect of calcium oxide on chromium solidification during the melting of hazardous waste incineration fly ash.

Thermal treatment technology considerably affects the harmlessness of fly ash (FA), but highly toxic heavy metals, such as Cr, attract considerable attention. In this study, we investigated the influence of CaO dosage at 600°C-1200 °C on the curing effect of Cr during FA thermal treatment based on the combination effect of CaO. Static, dynamic, and continuous sequential leachings were performed for the sintered products.