Author(s): Jing Huang; Shiqiang Lu
Linked Author(s):
Keywords: Water environment; Total Nitrogen; Load model; Pollution treatment
Abstract: The water quality in estuaries has been aggravated by the excessive nutrients from lands. Nitrogen compounds are one of the main factors for the water eutrophication, especially the inorganic nitrogen in Changjiang River Estuary and Hangzhou Bay. It’s necessary to take the targeted measurements of the treatment and control as soon as possible. Nanzhu River located in Shanghai with more Total Nitrogen (TN) is taken as an example. It’s one of the main drainage channels along the Hangzhou Bay in the Taihu Lake Basin. Based on the evaluated pollution loads of the TN sources, the local rural sewage pollution is the maximum and after them the agricultural non-point pollution. To effectively improve the nearshore water quality, the TN load model has been established and calibrated to simulate the water quality coupling with the hydrodynamic sub-model, rainfall runoff sub-model and water quality sub-model by MIKE 11 software. The numerical results are shown that the max net inflows of TN come from the west tributaries in Town C with about 56.06 t/a by 35% of the total net TN and 4.1x107 m3/a by 47% of the total net inflows. When a series of measures including reducing the non-point sources of the planting industry, upgrading and renovating the rural domestic sewage facilities, controlling the aquaculture and urban pollution are carried out simultaneously, the TN in Nanzhu River would be reduced to 1.94 mg/L, about 6% fall.
Year: 2024