上海淀山湖水环境容量评估

淀山湖是上海市重要的饮用水源保护区和生态涵养区.近10年来水质富营养化程度急剧增加,藻类水华频发,对上海饮用水源地水质安全构成了巨大威胁.为水污染控制和水质改善提供科学依据,利用已有评估模型评估了不同水质目标情景下淀山湖对COD、TN 和TP的最大容量,结果表明,在保持现状水质条件下,COD、TN和TP的环境容量分别为47213,8337.7,476.3t/a;水质控制目标为II类时,其环境容量分别为46325,1191.1,59.5t/a;水质目标为III类时,环境容量分别为68547,2382.2,119.1t/a.为IV类水质目标时,TN、TP的环境容量分别为3573.3,238.2t/a.

Water environmental capacity assessment of Dianshan Lake in Shanghai

The Dianshan Lake is an important area for drinking water supply protection and ecological conservation in Shanghai. Over the last ten years, its increasing eutrophication and the resulting algae bloom, had severely threatened the safety of Shanghai’s drinking water supply. To provide a scientific basis for its pollution control and water quality improvement, based on different scenarios of water quality control targets (WQCTs), the Dianshan Lake’s water environmental capacities for COD, TN and TP were calculated. Study results show that: (1) To maintain current water quality conditions, the lake’s environmental capacities for COD, TN and TP were 47213t/a, 8337.7t/a, and 476.3t/a, respectively; (2) If the WQCTs were set as level II, the lake’s environmental capacities for COD, TN and TP are 46325t/a, 1191.1t/a, and 59.5t/a, respectively. (3) If the WQCTs were set as level III, the lake’s environmental capacities for COD, TN and TP are 68547t/a, 2382.2t/a, and 119.1t/a, respectively. (4) If WQCTs were set as level IV, the lake’s environmental capacities are 3573.3t/a were 238.2t/a for TN and TP, respectively.