Solidification/Stabilization Effect of Ferrous Sulfate and Calcium Hydroxide/Calcium Oxide on High Concentration Chromium Contaminated Soil

Solidification/stabilization effect of FeSO
₄
and Ca(OH)
₂
/CaO on chromium contaminated soil were studied by contrast, especially the effect of its reaction interval time and concentration. The change of S/S effect with time was also discussed. Results reveal that the reaction interval time effected on S/S slightly, with the high quality ratio of water to soil. As FeSO
₄
and Ca(OH)
₂
was used as the S/S agent, when the FeSO
₄
concentration went up to more than 3 times, the Cr(VI) concentration could reach the standard stably (less than 5 mg/L); when FeSO
₄
and CaO was used, the Cr(VI) concentration could be less than 5 mg/L with the FeSO
₄
concentration more than 4 times in 20 d. The S/S effect of FeSO
₄
and Ca(OH)
₂
was better than that of FeSO
₄
and CaO under the same condition.