Sichuan Wastewater Treatment Plant, Cuiping District, Yibin | China

The Sichuan wastewater treatment plant is located in Cuiping District, Yibin, Sichuan Province, China, along the Yangtze River landscape avenue. It serves a population of approximately 396,600, classifying it as a large agglomeration under Chinese wastewater management standards. The plant is situated inland, more than 50 km from the coast, and its treated effluent likely discharges into the Yangtze River system. As a large-scale municipal facility in China, the plant operates under the national discharge standards set by the Ministry of Ecology and Environment, which require advanced treatment for plants serving over 100,000 people in sensitive areas. The Yangtze River basin is designated as a key water protection zone, necessitating stringent pollutant removal to meet Class I or Class A discharge limits. Typical processes for plants of this scale include activated sludge with biological nutrient removal. The plant's receiving water body is part of the Yangtze River watershed, which flows eastward through central China before emptying into the East China Sea near Shanghai. The downstream environment supports diverse aquatic life and provides drinking water for millions. Effective treatment at this facility is critical to reducing nutrient loads and protecting the ecological health of the Yangtze River and its estuary.

The plant discharges into the Yangtze River system, which flows through Sichuan and downstream provinces before reaching the East China Sea. The Yangtze is a vital ecological corridor supporting numerous fish species, including the endangered Chinese sturgeon. Nutrient pollution from urban wastewater can contribute to algal blooms and hypoxia in the river and coastal waters, making advanced treatment essential for maintaining water quality and biodiversity.