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Related Experiment Videos

Nitrogen removal function of recycling irrigation system.

T Hitomi1, I Yoshinaga, Y W Feng

  • 1National Institute for Rural Engineering, 2-1-6, Kan'nondai, Tsukuba city, Ibaraki 305-8609, Japan. thitomi@nkk.affrc.go.jp

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|April 6, 2006
PubMed
Summary

Paddy fields in recycling irrigation systems effectively purify water by removing nitrogen (N). These systems accumulate N, demonstrating significant water purification capacity comparable to wetlands.

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Area of Science:

  • Environmental Science
  • Agricultural Science
  • Water Resource Management

Background:

  • Recycling irrigation systems are increasingly used in agriculture.
  • Understanding the nitrogen (N) removal capacity of these systems is crucial for water quality management.
  • Paddy fields play a significant role in agricultural water cycles.

Purpose of the Study:

  • To quantify the nitrogen (N) purification capacity of a paddy field within a recycling irrigation system.
  • To assess the relationship between the recycling ratio and the N removal efficiency.

Main Methods:

  • Collected irrigation water samples at 12-hour intervals from April to September 2003.
  • Sampled ponded water at the inlet, center, and outlet of the paddy field.
  • Calculated total nitrogen (N) inflow and outflow loads.

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  • Determined the N removal rate constant using first-order kinetics.

    • Main Results:

    • Total nitrogen (N) inflow was 30.7 kg ha(-1), and outflow was 27.8 kg ha(-1), resulting in a net outflow load of -2.9 kg ha(-1).
    • The N removal rate constant ranged from 0.017 to 0.024 m d(-1), consistent with values reported for wetlands and other paddy fields.
    • A strong correlation was observed between the recycling ratio and the N removal effect.

    Conclusions:

    • Paddy fields integrated into recycling irrigation systems exhibit significant nitrogen (N) purification capabilities.
    • The system effectively accumulates N within the irrigation and drainage network, contributing to overall water purification.
    • Optimizing the recycling ratio can enhance the nitrogen removal efficiency in these agricultural systems.