STP760

    Comparison of Three Solid Waste Batch Leach Testing Methods and a Column Leach Test Method

    Published: Jan 1981


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    Abstract

    As a participant in the American Society for Testing and Materials (ASTM) program evaluating U.S. Environmental Protection Agency (EPA) and ASTM solid waste extraction procedures, the Laramie Energy Technology Center of the U.S. Department of Energy has been conducting a study comparing various aspects of batch versus column extraction techniques. This study evaluates three batch extraction methods and compares these results with results obtained from column leach tests.

    A standard fly ash material was leached using three types of mixers, five liquid-to-solid ratios, and leach times ranging from 1 h to 96 h. The leachates were analyzed using an atomic absorption spectrophotometer equipped with a graphite furnace for the following metals: selenium, chromium, arsenic, lead, and cadmium. The pH was also determined on all the leachate samples.

    The data show that the batch test can be improved by increasing the liquid-to-solid ratio. The data also indicate that the leaching time can be decreased. Comparison of the data from the batch and column leach tests indicates that a correlation may exist.

    Keywords:

    leaching, trace metals, extraction, leachate, batch, column, EPA, ASTM, NBS, mixer, hazardous solid waste


    Author Information:

    Jackson, K
    Physical science technician, Laramie Energy Technology Center, Laramie, Wyo.

    Benedik, J
    Physical science technician, Laramie Energy Technology Center, Laramie, Wyo.

    Jackson, L
    Physical science technician, Laramie Energy Technology Center, Laramie, Wyo.


    Paper ID: STP28830S

    Committee/Subcommittee: D34.01

    DOI: 10.1520/STP28830S


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