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Nitrite removal in a submerged biofilter.

A Mano1, F Santana

  • 1Department of Environmental Sciences and Engineering, Faculty of Sciences and Technology-New University of Lisbon, Quinta da Torre, 2829-516 Caparica, Portugal.

Environmental Technology
|December 6, 2002
PubMed
Summary
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Submerged biofilters effectively remove nitrogen using carbon sources like acetate and ethanol. Nitrogen loading, not water flow, limits denitrification efficiency in these systems.

Area of Science:

  • Environmental Microbiology
  • Water Treatment Technologies
  • Biochemical Engineering

Background:

  • Submerged filters are favored for denitrification.
  • The nitrate shunt strategy optimizes biological nitrogen removal by reducing process steps.
  • Nitrite accumulation is achievable through controlled nitrification in various culture types.

Purpose of the Study:

  • To evaluate carbon source impact (acetate, ethanol, urban wastewater) on submerged downflow biofilter performance.
  • To investigate the influence of hydraulic loading on biofilter efficiency.
  • To identify key factors limiting nitrogen removal in submerged biofilters.

Main Methods:

  • Experimental study using a submerged downflow biofilter.
  • Comparison of three carbon sources: acetate, ethanol, and urban wastewater.

Related Experiment Videos

  • Analysis of nitrogen removal rates and efficiency under varying hydraulic loads.

    • Main Results:

    • Maximum nitrogen removal rates were comparable for acetate and ethanol.
    • Acetate and ethanol yielded significantly higher removal rates than urban wastewater.
    • Nitrogen massic loading was identified as the primary limiting factor for efficiency, surpassing hydraulic loading.

    Conclusions:

    • Acetate and ethanol are effective carbon sources for submerged biofilter denitrification.
    • Optimizing nitrogen massic loading is crucial for enhancing denitrification efficiency in submerged biofilters.
    • Submerged biofilters show promise for efficient biological nitrogen removal, with carbon source selection and loading rates being key parameters.