Remediating Lead, Zinc, Cadmium and Arsenic Contaminated Steel Smelting Site with Hydrochloric Acid and Sodium Hydroxide
A-two step soil washing experiment was conducted to search an effective washing technique for the remediation of the contaminated soil from a steel smelting site. Our results indicated that 0.5M of hydrochloric acid alone could reduce soil cadmium concentration to lower than 1 mg kg-1, 1M of hydrochloric acid alone could reduce soil lead concentration to lower than 140 mg kg-1, 2M of hydrochloric acid combined with 0.2M of sodium hydroxide could reduce soil zinc concentration to lower than 200 mg kg-1 and reduce soil arsenic concentration to lower than 20 mg kg-1, the washed soil could be safely reused according to the national exhibition land quality standards of grade A.
Y. M. Li et al., "Remediating Lead, Zinc, Cadmium and Arsenic Contaminated Steel Smelting Site with Hydrochloric Acid and Sodium Hydroxide", Applied Mechanics and Materials, Vol. 137, pp. 322-327, 2012