Water Purification Effect of Ecological Floating Bed Combination Based on the Numerical Simulation

The Wuqing urban section of the North Canal Basin, Tianjin, is a significant gathering place for multisource pollution, showing characteristics stagnant water body supplied by unconventional sources. With development economy and society, quality has been seriously polluted due to discharge sewage outlets influx nonpoint source pollution from farmland. In this study, based on results special experiments, two-dimensional hydrodynamic model was constructed. concentrations ammonia nitrogen (NH3-N), total phosphorus (TP), chemical oxygen demand (COD) in study area were simulated, parameters calibrated verified with measured values. Based verification, improvement scheme ecological floating bed different plant ratios set up simulate quality. research showed that average NH3-N, TP, COD decreased 10.4%, 15.7%, d 26.3%, respectively, after arranged. During parameter calibration validation, RMSE ranges 0.09~0.22 mg/L, 0.00~0.02 0.37~2.42 respectively. Other statistical indicators are also within reasonable range, accuracy reliability high. simulation scenarios optimal ratio plants 700 m2 Scirpus validus Vahl Canna zone 1 combination, 430 Vahl, 170 Iris 2 200 Lythrum salicaria 3 combination. This can provide theoretical basis sustainable purification Canal. It approach implementation river schemes, exemplified