Sichuan Wastewater Treatment Plant, Xinjin District, Chengdu | China

The Sichuan wastewater treatment plant is located in Xingyi Town, Xinjin District, Chengdu, Sichuan Province, China. It serves a population equivalent of 38,900, classifying it as a medium-sized agglomeration under Chinese wastewater regulations. The plant is situated inland, approximately 50 km from the coast, and its operations are part of the broader municipal infrastructure for the Chengdu metropolitan area. Under China's national wastewater standards, plants of this scale are typically required to meet Class 1-A or Class 1-B discharge limits, which mandate secondary treatment with nutrient removal for sensitive water bodies. Regulatory expectations for this population tier emphasize effective biological treatment and phosphorus removal to protect downstream water quality. The plant discharges into local rivers that ultimately flow into the Yangtze River basin, one of China's most ecologically and economically significant watersheds. The Yangtze River supports diverse aquatic life, including endangered species such as the Chinese sturgeon and finless porpoise, and provides water for millions of people. Proper treatment at this plant helps reduce nutrient and pollutant loads entering the river system, contributing to the health of the downstream environment.

The plant discharges into local tributaries of the Yangtze River basin, which flows eastward through central China before emptying into the East China Sea near Shanghai. The Yangtze River supports a rich diversity of fish and aquatic species, including several endemic and migratory species. Downstream ecosystems include floodplain lakes and wetlands that provide critical habitat for waterfowl and fish spawning. Effective wastewater treatment is essential to prevent eutrophication and protect these ecologically sensitive areas from excessive nutrient inputs.