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Related Experiment Videos

Bacterial dynamics in the sub-surface constructed wetland.

J Vymazal1, J Balcarová, H Dousová

  • 1Ecology and Use Wetlands, Praha, Czech Republic. vymazal@yahoo.com

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|January 24, 2002
PubMed
Summary

Constructed wetlands effectively reduce bacteria. Bacterial numbers decrease rapidly along the wetland bed, with more bacteria found on Phragmites australis roots than Phalaris arundinacea roots.

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Area of Science:

  • Environmental Engineering
  • Microbiology
  • Ecology

Background:

  • Constructed wetlands are recognized for contaminant removal, including bacterial pollution.
  • Limited data exists on the distribution of bacteria on macrophyte roots within these systems.

Purpose of the Study:

  • To investigate the distribution of total aerobic and anaerobic bacteria, coliform bacteria, and fecal streptococci on macrophyte roots in a sub-surface horizontal flow constructed wetland.
  • To compare bacterial colonization on Phalaris arundinacea and Phragmites australis roots.

Main Methods:

  • Monitoring bacterial populations (total aerobic/anaerobic, coliforms, fecal streptococci) in wastewater and on macrophyte roots.
  • Sampling conducted over two years (1998-1999) in a constructed wetland treating municipal sewage.

Related Experiment Videos

  • Analysis of bacterial counts on roots of Phalaris arundinacea and Phragmites australis.

    • Main Results:

    • Bacterial numbers on root surfaces showed a steep decline within the initial meters of the constructed wetland bed.
    • Significantly higher bacterial counts were observed on Phragmites australis roots compared to Phalaris arundinacea roots.
    • Seasonal variations did not have a statistically significant impact on bacterial counts on macrophyte roots.

    Conclusions:

    • The root surfaces of macrophytes in constructed wetlands play a role in bacterial reduction.
    • Root type influences bacterial colonization, with Phragmites australis supporting higher bacterial loads.
    • Constructed wetland design and macrophyte selection can impact bacterial removal efficiency.