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Related Experiment Videos

Simultaneous nitrification and formaldehyde biodegradation in an activated sludge unit.

M Eiroa1, C Kennes, M C Veiga

  • 1Chemical Engineering Laboratory, Faculty of Sciences, University of A Coruña, Rúa Alejandro de la Sota, no. 1, 15008-A Coruña, Spain.

Bioresource Technology
|August 9, 2005
PubMed
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This study shows activated sludge units effectively remove formaldehyde and ammonium simultaneously. High removal rates for both pollutants were achieved even with increasing organic loading, demonstrating no inhibition of nitrification.

Area of Science:

  • Environmental Science
  • Environmental Engineering
  • Microbiology

Background:

  • Formaldehyde and ammonium are common industrial pollutants.
  • Wastewater treatment often requires simultaneous removal of multiple contaminants.
  • Activated sludge processes are widely used for biological wastewater treatment.

Purpose of the Study:

  • To investigate the simultaneous removal of formaldehyde and ammonium using a lab-scale activated sludge unit.
  • To assess the impact of increasing organic loading (from formaldehyde) on ammonium removal efficiency.
  • To determine if formaldehyde inhibits nitrification in activated sludge systems.

Main Methods:

  • Operation of a lab-scale activated sludge unit with a hydraulic retention time of 2.4 days.

Related Experiment Videos

  • Influent ammonium concentration maintained at 350 mg NH4+-N/L.
  • Stepwise increase of formaldehyde concentration (26 to 3168 mg/L) to elevate organic loading rate (0.01-1.40 g COD/Ld).

    • Main Results:

    • High formaldehyde removal efficiencies (around 99.5% +/-0.38) were consistently achieved.
    • Excellent ammonium removal efficiencies (around 99.9% +/-0.01) were observed throughout the experiment.
    • Effluent ammonium concentration remained below 0.1 mg NH4+-N/L across all tested organic loading rates.

    Conclusions:

    • Activated sludge is highly effective for simultaneous formaldehyde and ammonium removal.
    • Nitrification processes are not inhibited by formaldehyde, even at high organic loading rates.
    • This study supports the use of activated sludge for treating wastewater containing both formaldehyde and ammonium.