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Temperature effects in treatment wetlands.

R H Kadlec1, K R Reddy

  • 1Wetland Biogeochemistry Laboratory of the University of Florida, Gainesville 32611-0510, USA.

Water Environment Research : a Research Publication of the Water Environment Federation
|January 5, 2002
PubMed
Summary

Temperature significantly impacts wetland nutrient removal processes, especially nitrogen cycling. Colder temperatures slow down treatment, reducing overall efficiency in constructed wetlands.

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Area of Science:

  • Environmental Science
  • Biogeochemistry
  • Ecology

Background:

  • Wetland treatment efficiency is influenced by biogeochemical processes.
  • Temperature is a key environmental factor affecting these processes.
  • Nutrient removal in wetlands involves complex carbon, nitrogen, and phosphorus cycling.

Purpose of the Study:

  • To discuss the effects of temperature on carbon, nitrogen, and phosphorus cycling in treatment wetlands.
  • To analyze the implications of temperature-mediated processes on water quality.
  • To evaluate the temperature dependence of various removal mechanisms in wetlands.

Main Methods:

  • Review of existing literature on temperature effects on wetland biogeochemical processes.
  • Analysis of temperature coefficients (theta) for different nutrient cycling reactions.
  • Comparison of temperature effects on microbial and physical removal processes.

Main Results:

  • Temperature significantly affects microbially mediated reactions, with greater sensitivity at lower temperatures (< 15°C).
  • Nitrogen cycling processes (mineralization, nitrification, denitrification) show higher temperature dependence (theta: 1.05-1.37) than carbon cycling.
  • Phosphorus sorption and biochemical oxygen demand removal are least affected by temperature, while nitrogen removal is more significantly impacted (theta: 0.988-1.16).

Conclusions:

  • Temperature is a critical factor influencing the efficiency of constructed wetlands for nutrient removal.
  • Seasonal temperature variations, particularly colder climates, can lead to a slowdown in treatment processes.
  • Understanding temperature effects is crucial for accurate design models and optimizing wetland performance for water quality improvement.

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