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Related Experiment Videos

Phthalate hydrolysis under landfill conditions.

S Jonsson1, V A Vavilin, B H Svensson

  • 1Department of Water and Environmental Studies, Linköping University, SE-581 83 Linköping, Sweden. susjo@tema.liu.se

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|June 21, 2006
PubMed
Summary

This study models landfill co-digestion of municipal solid waste and phthalic acid diesters. Methanogenesis improved recalcitrant waste and diester breakdown, reducing leachate concentrations.

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Area of Science:

  • Environmental Engineering
  • Biotechnology
  • Chemical Engineering

Background:

  • Phthalic acid diesters (PADs) are common contaminants in landfills.
  • Municipal solid waste (MSW) co-digestion presents complex degradation pathways.
  • Understanding PAD fate during MSW co-digestion is crucial for environmental management.

Purpose of the Study:

  • To develop and calibrate a one-dimensional distributed model for MSW and PAD co-digestion.
  • To investigate the impact of different MSW fractions and PADs on degradation processes.
  • To analyze the factors influencing PAD concentrations in landfill leachate.

Main Methods:

  • Utilized experimental data from a landfill simulation reactor.
  • Developed a one-dimensional distributed model incorporating hydrolysis, sorption, and methanogenesis.

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  • Simulated co-digestion of easily degradable and recalcitrant MSW with three PADs (diethyl phthalate, dibutyl phthalate, di-2-ethylhexyl phthalate).
  • Accounted for pH inhibition on hydrolysis and methanogenesis.

    • Main Results:

    • Modeled PAD leachate concentrations were explained by desorption-sorption equilibrium.
    • Inhibition of recalcitrant MSW hydrolysis and PAD hydrolysis ceased upon inducing methanogenic conditions.
    • The model successfully calibrated using experimental data.

    Conclusions:

    • Physicochemical processes significantly influence PAD persistence in landfills.
    • Methanogenesis is key to overcoming inhibition and enhancing PAD degradation in co-digestion systems.
    • The developed model provides a valuable tool for predicting PAD behavior in landfills.