401 / 2024-03-13 10:39:27

Systematic review and practice on the governing of black-odorous water bodies in county-level cities

black-odorous water,county-level cities,holistic governing,water pollution control,aquatic ecosystem restoration

Subtheme 3: Eco-hydraulics and Environment > Topic 5: Theory and Technology of Water Eco-environment Restoration

With the deepening on the battle for the governing of black-odorous water bodies in China, county-level cities would become the crucial area to achieve the ultimate goal of water pollution prevention and control. The governing of black-odorous water bodies in metropolitan cities has gotten significant achievements. However, due to the complexities of pollution, the the lack of sewage and garbage treatment and collection and insufficient funds, the governing of black-odorous water bodies in county-level cities is relatively difficult and the typical practices are scarce. Therefore, the present work systematically reviewed the literatures and project cases on the governing the black-odorous water bodies in county-level cities and puts forward a holistically technical scheme, including source reduction, process control and end enhancement, to advance the governing the black-odorous water bodies in county-level cities. The measures of sewage interception, non-point pollution control, endogenous pollution control, aquatic plants restoration and long-term monitoring are widely applied and have obvious improvements in the governing the black-odorous water bodies. Then, the holistic technical scheme is practiced in a typical black-odorous river channel located in a county city in Hubei province. In the practice, the 9.7 km of drainage network are renovated, the 25100 m³ of polluted sediments are dredged, the microbial agent and natural purification materials are applied, and totally 10184 m² of aquatic plants are restored. After the holistic governing, the transparency, dissolved oxygen, redox potential and NH₃-N in the county channel averagely reached 23cm, 4.7 mg/L, 122 mV and 3.38mg/L, respectively, which were relatively far away from the judgement standard of the black-odorous water bodies in China, and the aquatic plants growth well in the county channel, indicating the successfully practice on governing the the black-odorous water bodies in county-level cities by the holistic technicals. The present work could provide a reference for the subsequent governing of black-odorous water in county-level cities.