上海市竹园第一污水处理厂升级改造工程对长江口水体环境的影响

上海市竹园第一污水处理厂升级改造工程处理规模为170×104 m3/d，远期采用A/O生物脱氮工艺，近期按普通曝气工艺运行.选择枯季和丰季，考虑进水COD_Cr在未经处理、经现有化学生物絮凝工艺处理和经升级改造后工艺处理下，应用数学模型对污水处理厂尾水排放对长江口COD_Cr混合区的范围影响以及敏感区的入侵进行模拟预测.结果表明:在枯季最不利水文条件下，升级改造工艺处理后COD_Cr稀释度为100～150倍的水域面积接近误差范围，远小于未经处理和现有工艺处理后的混合区范围；上游8 km 处ρ(COD_Cr)的最大增量为0.28 mg/L，已接近背景值，远小于未经处理和现有工艺处理后的最大增量，对敏感区凌桥取水口不会造成影响. 

Influence of Zhuyuan No.1 Wastewater Treatment Plant Upgrading and Rebuilding Engineering to the Water Environment in the Changjiang Estuary

With design capacity of 170×104　m3/d,the new structure of A/O biological nitrogen removal technology will be applied for the upgrading and rebuilding engineering in Shanghai Zhuyuan No.1 Wastewater Treatment Plant in the long term, while the ordinary aeration technology will be applied inthe near future. Under dry/wet seasons, considering three conditions including influent COD_Cr untreated, influent COD_Cr treated with current chemical-biological flocculation, and treated with upgraded and rebuilt process, mathematical models were applied to simulate and project the intrusion of sewage plant effluent into COD_Cr mixed zone and sensitive area at Changjiang Estuary. The resultsindicate that, under the worst hydrological conditions of dry season, the COD_Cr 100～150 times dilution area is far smaller after upgrading and rebuilding engineering, and the mass concentration of COD_Cr increment (0.28 mg/L) at upstream 8 km approaches to the background value and is also far lower than the other two conditions, and thus will not exert majorimpacts on the water intake at Lingqiao.