Shanghai Wastewater Treatment Plant, Changxing Town, Chongming District, China

The Shanghai wastewater treatment plant is situated in Changxing Town, Chongming District, China, serving a population of approximately 690,000. This large agglomeration is part of the greater Shanghai metropolitan area, one of the world's most populous urban regions. The plant's designed capacity is 1. As a major facility in China, the plant operates under national wastewater discharge standards, which for large agglomerations typically require secondary treatment with nutrient removal to protect sensitive water bodies. China's Water Pollution Prevention and Control Action Plan mandates stringent effluent limits for plants discharging into coastal and riverine environments. The plant's scale places it in a category requiring advanced treatment to meet Class 1A or 1B standards under the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plants (GB 18918-2002). The plant's treated effluent is discharged into the Yangtze River estuary, a major ecological transition zone between freshwater and marine environments. The Yangtze River flows into the East China Sea, supporting diverse aquatic life including the critically endangered Yangtze finless porpoise and serving as a critical migratory corridor for fish and birds. The estuary is also a key economic zone for fisheries and shipping.

The plant discharges into the Yangtze River estuary, which flows into the East China Sea. This estuarine environment supports a rich biodiversity, including migratory fish species and waterbirds. The area is ecologically sensitive due to its role as a nursery ground for commercial fisheries and its proximity to the Chongming Dongtan wetlands, which provide critical habitat for migratory shorebirds along the East Asian-Australasian Flyway.