A Simulation Analysis of Comprehensive Remediation Effect of the Zhuqiao River Based on Mathematical Modeling of Water Environment

With comprehensive consideration of water pollution sources and hydrological conditions in the Zhuqiao River Basin, where water environment remediation practices are in place, a 2-dimensional (2D) hydrodynamic and water quality model that describes the transport of water pollutants was used to assess if the remediation practices could help the Zhuqiao River Basin achieve the Surface Water Quality Standards (SWQS). The model parameters were calibrated using both field data and monitoring data. The calibrated model was then used for water quality modelling of the Zhuqiao River Basin. The results show that if the sewage interception percentage reaches 60% as contributed by the remediation practices, the mainstream levels of COD and NH₄⁺-N will stably achieve the Class Ⅲ SWQS at the mouth of the river while TP will fail it. In order to ensure that the overall water quality stably achieve the Class Ⅲ SWQS, the number of pigs should be reduced by approximately 3 000 per year to control the animal waste.