A study of soil column experiments for copper contaminated silt flushed by chelating agents

Great attention has been paid to soil contamination in China. Therefore, a series of soil column experiments were conducted to examine the removal behavior of copper from silty soil flushed with different chelating agents. The results indicate that the removal efficiency of copper was different when using different chelating agents the efficiency is in the order of EDTA > CIT > NTA. The increasing EDTA concentration was not effective in promoting copper removal. 0.005 mol/L of EDTA is an effective and economic concentration and the removal ratio can reach 84%. When the concentration of EDTA is 0.015 mol/L, the removal ratio of copper decreases with the increasing concentration of copper in silt, and the largest removal ratio is 84%, while the removal amount of cooper increases. The results can provide theoretical reference for the heavy metal contaminated soil remediation process.