Treatment of low-level As contaminated excavated soils using ZVI amendment followed by magnetic retrieval

摘要

This study investigates the remediation of low-level As contaminated excavated soils from con-struction projects by ZVI amendment followed by magnetic retrieval.A case study was conducted with alkaline excavated soil (total As only 7.5 mg kg~(-1)).The remediation efficiency was assessed using sequential leaching tests.The results showed ZVI amendment (1% ZVI and 0.5 mL kg~(-1) H2SO4 of soil) followed by mag-netic retrieval could significantly decrease water-leachable As (from 33 μgL~(-1) to <3 μgL~(-1)),also the potential leachability of As in this excavated soil.These initial results indicate that this treatment could be developed for the efficient remediation of low-level As contaminated excavated soils.