Overview
Agricultural non-point source pollution threatens water quality and ecological systems. To control it, the first and most important task is to control the migration and transformation of nitrogen and phosphorus in agricultural ditches.
Model Setup
An ecological ditch was designed and a pilot device was built according to the design. The mechanism of nitrogen and phosphorus removal in ditches under the collaboration of aquatic organisms and hydraulic power was studied through dynamic and static experiments, examining the specific influences of environmental factors such as influent concentration, influent flow, and water level. The transport and diffusion of N and P in the ditch was simulated using the three-dimensional EFDC water quality model, and the simulation results were compared with the experimental data.
Key Findings
The average relative errors of the EFDC model simulated results were all less than 15%, which verified the reliability of the model for simulating nitrogen and phosphorus transport in ecological ditches.