济源石河底泥重金属生态风险评价及无害化研究

Ecological Risk Assessment and Harmlessness Research of Heavy Metals in Sediment from Stone River in Jiyuan City

对济源石河底泥进行了重金属潜在生态风险评估,发现石河底泥存在严重的重金属污染。通过对不同重金属元素的单一金属潜在生态风险因子指数进行分析,可以看出石河底泥中产生生态危害的主要重金属为Cd和Hg,其次为As和Pb。为了实现危害物资源化,采用截流分段和化学固化的方法对河流底泥进行无害化处理,处理后的底泥醋酸浸出液中重金属含量明显降低,无害化处理工艺效果显著。

The potential ecological risk of heavy metals in sediment from Stone River in Jiyuan Cit- y was assessed by single potential ecological risk index. The results showed that the potential ecological risks mainly originated from Cd and Hg, and followed by As and Pb, indicating severe contamination of heavy metals in Stone River. The methods of closure segment and chemical curing were used to realize the harmless treatment of the sediment. The concentrations of heavy metals in acetic acid leaching solution of the treated sediment were significantly reduced.