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Bioremediating herbicide-contaminated soils

E K Dzantor1, A S Felsot, M J Beck

  • 1Tennessee Valley Authority, Muscle Shoals, AL 35660.

Applied Biochemistry and Biotechnology
|January 1, 1993
PubMed
Summary

Landfarming combined with biostimulation effectively remediated pesticide wastes. Organic amendments significantly enhanced soil bioactivity and herbicide dissipation, particularly for alachlor.

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Area of Science:

  • Environmental Science
  • Soil Science
  • Agrochemistry

Background:

  • Pesticide contamination poses environmental risks.
  • Remediation of pesticide-contaminated soil is crucial for ecosystem health.
  • Landfarming and biostimulation are potential remediation strategies.

Purpose of the Study:

  • To evaluate the efficacy of combining landfarming and biostimulation for pesticide waste remediation.
  • To assess the impact of organic amendments (sewage sludge, corn meal) on herbicide dissipation.
  • To monitor soil bioactivity and herbicide degradation rates.

Main Methods:

  • Field plots were treated with pesticide-contaminated soil or fresh spray mixtures.
  • Organic amendments (sewage sludge, corn meal) were incorporated into designated plots.
  • Soil dehydrogenase activity and herbicide concentrations (alachlor, trifluralin, metolachlor, atrazine) were monitored over 100 days.

Main Results:

  • Soil dehydrogenase activity was highest in organic-material-amended plots.
  • Alachlor dissipation ranged from 85-95% in amended contaminated soil and 75-85% in unamended.
  • In freshly sprayed plots, alachlor dissipation was 95-100% in amended and 85-95% in unamended plots.
  • Trifluralin dissipation was 70-80% in amended and 60-75% in unamended plots.

Conclusions:

  • Combining landfarming and biostimulation, especially with organic amendments, enhances pesticide remediation.
  • Organic amendments significantly improve soil bioactivity and accelerate herbicide dissipation.
  • The applied remediation strategy shows high efficacy for alachlor and trifluralin removal from contaminated soils.

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