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Related Experiment Videos

Performance modeling of subsurface-flow constructed wetlands systems.

M F Dahab1, R Y Surampalli, W Liu

  • 1Department of Civil Engineering, University of Nebraska-Lincoln, 68588-0531, USA.

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

Constructed wetlands (CW) effectively treat wastewater from small communities, with BOD5 and NH3-N removal approximated by first-order kinetics. However, TP removal kinetics were unclear, and observed removal rates were lower than expected.

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Area of Science:

  • Environmental Engineering
  • Water Treatment Technologies
  • Ecological Engineering

Background:

  • Constructed wetlands (CW) are increasingly utilized for wastewater treatment.
  • Small community systems require efficient and reliable treatment solutions.
  • Subsurface flow CW systems offer a potential solution for decentralized wastewater management.

Purpose of the Study:

  • To evaluate the effectiveness of a subsurface flow constructed wetland (CW) system for a small community wastewater treatment.
  • To compare field data with prediction models for key pollutant removal.
  • To analyze the removal kinetics of biochemical oxygen demand (BOD5), ammonia nitrogen (NH3-N), and total phosphorus (TP).

Main Methods:

  • Extensive biweekly monitoring of a CW system from June 1996 to December 2000.

Related Experiment Videos

  • Application of prediction models for soluble CBOD5, NH3-N, and TP removal.
  • Comparison of model predictions with field-collected data.
  • Kinetic analysis of pollutant removal rates.

    • Main Results:

    • BOD5 and NH3-N removal approximated first-order kinetics.
    • TP removal kinetics were not clearly defined by the models or data.
    • Regressed reduction rate constants from field data were lower than reported literature values.
    • The CW system demonstrated effectiveness in treating wastewater for a small community.

    Conclusions:

    • Subsurface flow CW systems can be effective for small community wastewater treatment.
    • First-order kinetics adequately describe BOD5 and NH3-N removal.
    • Further research is needed to clarify TP removal kinetics in CW systems.
    • Observed pollutant reduction rates in this study suggest site-specific factors influence CW performance.