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Related Experiment Videos

Utilisation of bottom ash in road construction: a lysimeter study.

V Bruder-Hubscher1, F Lagarde, M J Leroy

  • 1Laboratoire de Chimie, ECPM, Strasbourg, France.

Waste Management & Research : the Journal of the International Solid Wastes and Public Cleansing Association, ISWA
|August 31, 2002
PubMed
Summary

Municipal solid waste (MSW) bottom ash is a potential road construction material but requires environmental assessment. A lysimeter study showed chlorides readily leach, while sulfates are less soluble, informing safe utilization strategies.

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Area of Science:

  • Environmental Science
  • Geotechnical Engineering
  • Waste Management

Background:

  • Municipal solid waste (MSW) incineration produces 2.7 million tons of bottom ash annually in France.
  • Bottom ash utilization in road construction is encouraged but regulated due to metal and salt content.
  • Potential environmental impacts from leaching require careful study.

Purpose of the Study:

  • Develop a laboratory lysimeter to simulate bottom ash utilization conditions.
  • Investigate the environmental impact of bottom ash by analyzing percolate composition.
  • Assess the influence of water flow rate and pressure on leachate quality.

Main Methods:

  • A laboratory lysimeter was developed to mimic real-world bottom ash use.
  • Four lysimeter experiments were conducted to test reproducibility and parameter influences.

Related Experiment Videos

  • Lysimeter results were compared with data from experimental road sections and standard leach tests (AFNOR NF X31-210).

    • Main Results:

    • Lysimeter tests demonstrated high chloride recovery (89%), indicating near-complete dissolution.
    • Sulfate recovery ranged from 30-35%, suggesting lower solubility compared to chlorides.
    • Reproducibility and parameter influences (flow rate, pressure) on leachate were assessed.

    Conclusions:

    • The developed lysimeter effectively simulates bottom ash leaching behavior.
    • Chloride leaching is significant, while sulfate leaching is limited under tested conditions.
    • Findings support informed regulation and safe application of bottom ash in road construction.