铬污染场地铁碳微电解法原位修复实例研究

Case study on situ recovery using ferric-carbon micro-electrolysis for chromium contaminated site

以某电镀厂为研究对象,在收集研究区水文地质、污染现状等资料的基础上,开展以铁碳微电解填料为还原剂去除Cr6+的室内实验研究,在确定修复参数后,开展了土壤原位淋洗的中试试验研究。室内实验结果表明铁碳微电解法可在60 min内将水中Cr6+质量浓度由22.52 mg/L降至0.012mg/L;野外中试试验结果表明,污染羽得到有效控制,试验运行5个月后,受污染区域的各监测井Cr6+质量浓度均小于0.05 mg/L。修复治理效果评估表明,修复治理工程的运行明显地抑制了Cr6+向下游的扩散,保证了居民用水安全和地下水环境。

Taking a certain electroplating factory as the study object, based on the site investigation and contaminative data collection,laboratory experiment of using ferric-carbon micro-electrolysis as reductant for Cr（ VI）treatment was done. After determining the repair parameters,pilot test of soil washing in situ was carried out. The results of indoor laboratory experiment show that the concentration of Cr6＋was decreased form 22. 52 mg / L to 0. 012 mg / L after applying ferric-carbon micro-electrolysis for 60 min. The results of pilot test show that this project can control the contamination plume effectively. After five months,the concentrations of Cr6＋in monitoring wells were all less than 0. 05 mg / L. The results of effect evaluation of groundwater restoration project show that these groundwater restoration projects can control the range and concentration of contamination plume efficiently,ensuring the safety of drinking water for residents and groundwater environment.