Cu和Cd复合重金属污染土壤修复后对地下水的安全性研究

以修复前污染土壤为对照,对化学固化修复后的铜(Cu)、镉(Cd)复合重金属污染土壤进行了模拟酸雨淋溶实验和SPLP浸出实验,研究了修复后土壤中Cu、Cd的释放特征,应用模糊综合评级法,评价了修复后土壤对地下水安全的风险级别。在十年酸雨淋溶下,污染土壤Cd释放总量为14.06 mg,Cu为7.27 mg,对地下水安全的风险级别为11;修复后土壤中的Cu和Cd 10年释放总量都为0,对地下水安全的风险级别为1。Cu、Cd复合重金属污染土壤经化学固化修复后对地下水的风险较低。

Study on Groundwater Safety after Remediation of Heavy Metal Contaminated Soil by Cu and Cd

Based on the contaminated soil before remediation,the release characteristics of Cu and Cd in soil after chemical remediation were studied by simulated acid rain leaching test and SPLP leaching experiment on Cu(Cu)and CD(Cd)heavy metal contaminated soil.The fuzzy comprehensive rating method was used to evaluate the risk level of soil to groundwater safety after restoration.In the ten years of acid rain leaching, the total amount of Cd released from polluted soil was 14.06mg, Cu was 7.27mg, and the level of risk for groundwater safety was 11.The total amount of Cu and Cd released in the 10 years after remedi-ation was 0,and the risk level for groundwater safety was 1.Cu,Cd compound heavy metal contaminated soil has a lower risk of groundwater after chemical curing.