SIMULATION OF NITRIFICATION AND DENITRIFICATION PROCESSES IN WELL-MIXED ESTUARY

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  • 強混合河川感潮部における硝化・脱窒過程のシミュレーション
  • キョウコンゴウ カセン カンチョウブ ニ オケル ショウカ ダッチツ カテイ

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Abstract

Modeling of nitrification and denitrification processes in a well-mixed estuary is performed and long term variations in nitrogen concentration are simulated for a fortnightly cycle, in which a Lagrangian reference frame is used to reduce numerical dispersion. In this model, kinetic parameters and the concentrations of nitrifying bacteria are given through experiments, and the denitrification in sediments is considered. On the basis of the simulation results, the process is quantitatively evaluated, and it shows that nitrification is affected by the change of suspended solids concentration during springneap cycles, and that the decrease in concentration of nitrate in water body is caused by nitrate reduction due to denitrification in sediments.

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