基于累积风险评价与多目标优化分配的 区域水污染物总量控制.

Environmental water pollution has become one of the key factors that constrain the development of urban and rural areas in China. However, the identification of high-risk priority control regions and the development of control schemes for the total amount of water pollutants still lack systematic studies. In this study, the risk prevention potential index of residents, the government, and enterprises was incorporated to construct a comprehensive water environmental risk evaluation system based on the“pressure-state-response”and to identify the risk control levels of each control unit. On this basis, a multi-objective waste load allocation model was constructed, and a water pollutant load（NH3-N）distribution scheme was constructed in Hongya County, Sichuan Province, China. The results showed that Hongchuan Town and Yuping Town, located in the lower reaches of the Qingyi River, were high-risk control units. Hongchuan Town was significantly affected by industrial wastewater discharge, while Yuping Town was jointly affected by large-scale livestock and poultry breeding, as well as industrial wastewater discharge. According to the comprehensive optimal distribution scheme, the reduction rates of ammonia nitrogen in Hongchuan Town and Yuping Town were 19.7% and 18.9%, respectively, while the total reduction rate in Hongya County was 16.3%. This study not only achieves fair and efficient reduction of water pollutants in each control unit, but also obtains a higher regional total reduction rate, which can provide a scientific reference for regional water environment management strategy formulation. [ABSTRACT FROM AUTHOR]