State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing, Jiangsu, 210023, China.
School of Management Science, Guizhou University of Finance and Economics, Guiyang, 550025, China.
Environ Sci Pollut Res Int. 2018 Apr;25(10):10014-10028. doi: 10.1007/s11356-018-1250-9. Epub 2018 Jan 29.
Reducing external nutrient loads is the first step for controlling eutrophication. Here, we identified external nutrient reduction requirements and potential of strategies for achieving reductions to remediate a eutrophic water body, Lake Taihu, China. A mass balance approach based on the entire lake was used to identify nutrient reduction requirements; an empirical export coefficient approach was introduced to estimate the nutrient reduction potential of the overall program on integrated regulation of Taihu Lake Basin (hereafter referred to as the "Guideline"). Reduction requirements included external total nitrogen (TN) and total phosphorus (TP) loads, which should be reduced by 41-55 and 25-50%, respectively, to prevent nutrient accumulation in Lake Taihu and to meet the planned water quality targets. In 2010, which is the most seriously polluted calendar year during the 2008-2014 period, the nutrient reduction requirements were estimated to be 36,819 tons of N and 2442 tons of P, and the potential nutrient reduction strategies would reduce approximately 25,821 tons of N and 3024 tons of P. Since there is a net N remaining in the reduction requirements, it should be the focus and deserves more attention in identifying external nutrient reduction strategies. Moreover, abatement measures outlined in the Guideline with high P reduction potential required large monetary investments. Achieving TP reduction requirement using the cost-effective strategy costs about 80.24 million USD. The design of nutrient reduction strategies should be enacted according to regional and sectoral differences and the cost-effectiveness of abatement measures.
减少外部营养负荷是控制富营养化的第一步。在这里，我们确定了外部营养减少的需求和实现减少的策略的潜力，以修复中国太湖富营养化水体。基于整个湖泊的质量平衡方法用于确定营养减少需求；引入经验出口系数方法来估算太湖流域综合调控总体计划（以下简称“指南”）的营养减少潜力。减少的需求包括外部总氮（TN）和总磷（TP）负荷，分别减少 41-55%和 25-50%，以防止太湖营养物质积累，并达到计划的水质目标。在 2010 年，这是 2008-2014 年期间污染最严重的历年，估计营养减少需求为 36819 吨 N 和 2442 吨 P，潜在的营养减少策略将减少约 25821 吨 N 和 3024 吨 P。由于减少需求中仍有净氮剩余，因此在确定外部营养减少策略时应将其作为重点，并给予更多关注。此外，《指南》中概述的具有高磷减少潜力的减排措施需要大量的资金投入。采用具有成本效益的策略实现 TP 减少需求的成本约为 8024 万美元。营养减少策略的设计应根据区域和部门差异以及减排措施的成本效益来制定。
