Abstract
Water monitoring results of the Danjiangkou Reservoir indicated that total nitrogen and total phosphorus concentrations are high and therefore worse than required for central drinking water supplies. Nutrients including nitrogen and phosphorus accumulated in the bank cultivated land were greater than those contained within the river estuary sediment as well as in the reservoir bay sediment. This implies that high concentrations of loosely exchangeable phosphorus (166.53 mg/kg) in cultivated land could, after the completion of the dam heightening project, easily lead to the development of algal blooms. Serious water and soil loss occurring in the reservoir area will promote the transportation of non-point source pollution mainly caused by untreated agricultural domestic wastewater, chemical fertilizer and livestock farming, which accounted for more than 50% of the total basin’s nutrient input loads. Ecological control techniques were therefore the first choice for nutrient reduction and water quality guarantee in the Danjiangkou Reservoir. In order to guide the ecological restoration process, leading international ecological methodologies were summarized and compared, taking into consideration aspects of engineering, as well as ecological, biological, environmental and economic advantages and disadvantages. Finally, novel ecological filtration and a purification dam were designed for eutrophication control.





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Acknowledgements
This study was supported by the Doctoral Fund of Changjiang River Scientific Research Institute (Nutrient Removal Simulation in Subsurface Flow Constructed Wetlands using Biofilm Carrier as Substrate), the Public Interest Scientific Research Fund of Ministry of Water Resource (Strategy for Danjiangkou Reservoir Drinking Water Safety) and the Central Public-interest Scientific Institution Basal Research Fund (Phosphorus Transfer in the Water Level Fluctuating Zone of the Danjiangkou Reservoir).
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Tang, X., Wu, M., Yang, W. et al. Ecological Strategy for Eutrophication Control. Water Air Soil Pollut 223, 723–737 (2012). https://doi.org/10.1007/s11270-011-0897-3
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DOI: https://doi.org/10.1007/s11270-011-0897-3