模拟重金属污染土壤的强化解吸与解吸液降解

文章对EDTA强化解吸模拟重金属污染土壤进行了实验研究。结果表明,EDTA能够迅速地解吸模拟土壤中的Cu、Cd和Pb等重金属。初始EDTA浓度、解吸时间以及离子强度的增加对土壤中重金属的解吸效果有一定的正影响作用。此外,考察了土壤解吸废液在零价铁/曝气体系中的处理。经过零价铁/曝气技术后,解吸废液中的重金属离子能被完全去除,EDTA和TOC的去除率分别达到了94.8%和86.6%。

Desorption of Simulated Heavy-metal Contaminated Soil and Degradation of Desorbed Solution

This paper presents an experiment on lab's simulated heavy-metal contaminated soil with a purpose to investigate enhanced desorption of the soil by EDTA. Result showed that Cu, Cd and Pb could be rapidly desorbed from the soil, and desorption rate increased with the raising of initial EDTA concentration, desorption time and heavy metal ion strength. As to the desorbed solution, a lab scale zero-valent iron/aeration treatment system was used and a complete removal of the abovementioned metals was achieved, with pretty good removals of EDTA and TOC as well.