Chongqing Wastewater Treatment Plant, Wansheng Economic-Technological Development Zone

The Chongqing wastewater treatment plant is located in the Wansheng Economic-Technological Development Zone, part of the Qijiang District in Chongqing, China. It serves a population of approximately 92,000, making it a medium-sized agglomeration under Chinese municipal wastewater standards. The plant is situated in a rapidly urbanizing area with significant industrial activity. As a municipal facility in China, the plant is subject to the national Discharge Standard of Pollutants for Municipal Wastewater Treatment Plants (GB 18918-2002), which sets effluent limits based on receiving water sensitivity. For plants serving populations over 50,000, secondary treatment with nutrient removal is typically required, with potential for tertiary treatment in environmentally sensitive areas. Regulatory compliance is expected. The treated wastewater is discharged into local water bodies within the Yangtze River basin, which ultimately flows into the East China Sea. The plant plays a critical role in protecting downstream aquatic ecosystems, including the Yangtze River's diverse fish populations and the Three Gorges Reservoir area, by reducing pollutant loads from urban and industrial sources.

The plant discharges into the Yangtze River basin, which drains into the East China Sea. The Yangtze is one of the world's most biodiverse rivers, supporting hundreds of fish species and providing critical habitat for migratory birds. Downstream, the Three Gorges Reservoir alters flow and sediment regimes, making nutrient and pollutant management essential for preventing eutrophication and protecting aquatic life.