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

Solidification/stabilization effect of FeSO₄ 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 FeSO₄ and Ca(OH)₂ was used as the S/S agent, when the FeSO₄ concentration went up to more than 3 times, the Cr(VI) concentration could reach the standard stably (less than 5 mg/L); when FeSO₄ and CaO was used, the Cr(VI) concentration could be less than 5 mg/L with the FeSO₄ concentration more than 4 times in 20 d. The S/S effect of FeSO₄ and Ca(OH)₂ was better than that of FeSO₄ and CaO under the same condition.