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Related Experiment Videos

Biofiltration of dichlorobenzenes.

F Roberge1, M J Gravel, L Deschênes

  • 1Department of chemical engineering, Ecole Polytechnique, PO Box 6079, St. CV, Montreal, QC. H3C 3A7, Canada.

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|January 5, 2002
PubMed
Summary

Air biofiltration effectively degraded dichlorobenzenes (DCBs) at a refinery. This study demonstrated the successful application of stripping followed by biofiltration for treating DCB-contaminated groundwater, achieving high removal rates.

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Area of Science:

  • Environmental Engineering
  • Biotechnology
  • Industrial Wastewater Treatment

Background:

  • Refinery wastewater often contains dichlorobenzenes (DCBs), posing environmental risks.
  • Conventional treatment systems may lead to volatilization of DCBs into ambient air.
  • A combined stripping and air biofiltration system offers a viable solution for DCB removal.

Purpose of the Study:

  • To evaluate the efficacy of air biofiltration for dichlorobenzene (DCB) degradation at a refinery.
  • To assess the performance of a two-step treatment process involving stripping and biofiltration.
  • To investigate the impact of naphthalene co-contamination on DCB biodegradation.

Main Methods:

  • A full-scale air stripping unit was employed to volatilize DCBs from contaminated groundwater.

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  • Two large-scale biofilters, filled with peat moss, manure, wood chips, and contaminated soil, were used for gas-phase DCB treatment.
  • Laboratory tests were conducted to assess microbial activity and degradation rates.
  • Full-scale operation was monitored over four months, analyzing influent and effluent concentrations.

    • Main Results:

    • The air stripper achieved over 99% DCB removal efficiency.
    • Full-scale biofilters maintained DCB concentrations below 1 ppmv in the outlet air.
    • Biofilter removal efficiency varied (0-79%) due to lower-than-expected DCB loads, operational fluctuations, and naphthalene presence.
    • Naphthalene co-contamination was observed to slow down DCB degradation.

    Conclusions:

    • Air biofiltration is a suitable technology for degrading dichlorobenzenes in industrial air streams.
    • The combined stripping and biofiltration system effectively reduces DCB emissions from contaminated groundwater.
    • Optimizing biofilter performance requires stable operating conditions and consideration of co-contaminants like naphthalene.