Leachability of heavy metals from scrap dirt sampled at two scrap iron and metal recycling facilities

Dorthe Lærke Jensen, Peter Engelund Holm, Thomas Højlund Christensen

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    Column and batch leaching experiments were performed to quantify leaching of heavy metals (Pb, Cu, Cd and Zn) from scrap dirt representing different activities at two iron scrap and metal recycling facilities. The scrap dirt is often found directly upon the bare unprotected soil at recycling facilities. In most cases the leaching of heavy metals was modest, within ®ve times the leaching from reference soils, and the concentrations were usually within a factor of 2 of drinking water criteria. The high pH of the scrap dirt samples seemed to control the leaching. However, scrap dirt from car battery salvage locations was different, showing lower pH and signi®cant leaching of lead (up to 8000 mg Pb l±1), cadmium (up to 40 mg Cd l±1), and zinc (up to 2000 mg Zn l±1). The column and batch leaching experiments gave comparable results at the order of magnitude level, and both approaches are, at that level, useful for evaluation of leaching potentials from scrap dirt. The experiments showed that scrap dirt at recycling facilities constitutes only a modest leaching problem, but a long-term soil pollution problem from a land-use perspective. Leaching experiments with compost solution indicated that covering of the scrap dirt with an organic rich dressing for vegetation support would dramatically increase the leaching of heavy metals.
    Original languageEnglish
    JournalWaste Management and Research
    Volume18
    Issue number4
    Pages (from-to)367-379
    ISSN0734-242X
    DOIs
    Publication statusPublished - 2000

    Keywords

    • metal recycling industry
    • Batch leaching
    • zinc
    • scrap iron industry
    • column leaching
    • soil contamination
    • copper
    • cadmium
    • lead
    • leachability
    • heavy metals

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