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Seasonal temperature declines do not decrease periphytic surfactant biodegradation or increase algal species

D M Lee1, J B Guckert, S E Belanger

  • 1Procter & Gamble Company, Environmental Science Department, Ivorydale Technical Center, Cincinnati, Ohio 45127-1087, USA.

Chemosphere
|September 23, 1997
PubMed
Summary
This summary is machine-generated.

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Seasonal temperature declines do not impact surfactant biodegradation or algal sensitivity in streams. Naturally acclimated periphyton effectively mineralize surfactants even as water temperatures decrease.

Area of Science:

  • Environmental Science
  • Microbiology
  • Ecotoxicology

Background:

  • River water temperature naturally decreases seasonally, potentially affecting microbial processes.
  • Surfactants are common pollutants, and their biodegradation by periphyton is crucial for water quality.
  • Algal sensitivity to pollutants can vary with environmental conditions.

Purpose of the Study:

  • To investigate the effects of seasonally decreasing river water temperature on surfactant biodegradation by periphyton.
  • To assess the impact of temperature decline on the sensitivity of periphytic algae to surfactants.
  • To determine if naturally acclimated periphyton exhibit altered biodegradation rates or increased algal sensitivity during seasonal temperature changes.

Main Methods:

  • Four stream mesocosm studies were conducted over five years, simulating seasonal temperature declines (9-14°C).

Related Experiment Videos

  • Periphyton were naturally colonized on tiles and exposed to specific surfactants (C12-AS, AES, AE) or final effluent at microgram/L concentrations.
  • Surfactant mineralization rates and periphytic algal taxonomy/biovolume were monitored over 8-11 week dosing periods.

    • Main Results:

    • Surfactant mineralization generally increased over the dosing period in dosed streams, with a positive correlation between surfactant concentration and mineralization during temperature decline.
    • Mineralization rates remained constant in control streams; AES mineralization increased at higher doses, while AE mineralization slightly increased with final effluent exposure.
    • No significant increases in periphytic algal species sensitivity were observed during the testing period, despite temperature fluctuations.

    Conclusions:

    • Naturally decreasing seasonal temperatures do not correlate with lower rates of surfactant mineralization by periphyton.
    • Acclimated periphyton maintain or increase surfactant biodegradation capacity even under declining temperature conditions.
    • Seasonal temperature changes do not lead to increased species sensitivity in naturally acclimated stream periphyton.