Piao Haishan, Bishop Paul L
Department of Civil and Environmental Engineering, University of Cincinnati, ML 0071, Cincinnati, OH 45221-0071, USA.
Environ Pollut. 2006 Feb;139(3):498-506. doi: 10.1016/j.envpol.2005.06.005. Epub 2005 Aug 11.
This paper summarizes the findings of our studies on mercury stabilization using sulfide. Primary stabilization variables such as stabilization pH and sulfide/mercury molar ratio were tested. Mercury stabilization effectiveness was evaluated using the Toxicity Characteristic Leaching Procedure (TCLP) and the constant pH leaching tests. The influence of interfering ions on mercury immobilization was also tested. The experimental results indicate that the sulfide-induced treatment technology is an effective way to minimize mercury leaching. It was found that the most effective mercury stabilization occurs at pH 6 combined with a sulfide/mercury molar ratio of 1. The combined use of increased dosage of sulfide and ferrous ions ([S]/[Hg]=2 and [Fe]/[Hg]=3 at pH=6) can significantly reduce interferences by chloride and/or phosphate during sulfide-induced mercury immobilization. The sulfide-treated waste stabilization efficiency reached 98%, even with exposure of the wastes to high pH leachants.
本文总结了我们关于使用硫化物稳定汞的研究结果。测试了诸如稳定化pH值和硫化物/汞摩尔比等主要稳定化变量。使用毒性特征浸出程序（TCLP）和恒定pH浸出试验评估汞的稳定化效果。还测试了干扰离子对汞固定化的影响。实验结果表明，硫化物诱导处理技术是最大限度减少汞浸出的有效方法。发现最有效的汞稳定化发生在pH值为6且硫化物/汞摩尔比为1的情况下。在硫化物诱导汞固定化过程中，增加硫化物和亚铁离子的用量（在pH = 6时，[S]/[Hg]=2且[Fe]/[Hg]=3）联合使用可显著减少氯离子和/或磷酸盐的干扰。即使将废物暴露于高pH值浸出剂中，经硫化物处理的废物稳定化效率仍达到98%。
