Yunnan Wastewater Treatment Plant, Datong Subdistrict, Shizong County, Yunnan

The Yunnan wastewater treatment plant is located in Datong Subdistrict, Shizong County, Qujing City, Yunnan Province, China. It serves a population of approximately 46,000 people, making it a medium-sized municipal facility in the region. The plant is situated in a mountainous area of southwestern China, where wastewater management is critical for protecting local water resources. As a Chinese wastewater treatment facility, the plant operates under national standards set by the Ministry of Ecology and Environment, which mandate secondary treatment for urban plants serving populations above 20,000. The plant's treatment processes are expected to meet the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918-2002), which includes limits on biochemical oxygen demand, chemical oxygen demand, suspended solids, and nutrients. The plant's treated effluent is discharged into local rivers that eventually flow into the Pearl River system, a major waterway in southern China. The Pearl River basin supports diverse aquatic ecosystems and provides water for agriculture, industry, and drinking water for millions of people. Proper treatment at this plant helps reduce nutrient and pollutant loads, protecting downstream water quality and ecological health.

The plant discharges into tributaries of the Pearl River, which flows through Yunnan, Guizhou, Guangxi, and Guangdong before emptying into the South China Sea. The Pearl River basin is ecologically significant, supporting a wide range of fish species and providing critical habitat for migratory birds. The region's karst topography makes groundwater particularly vulnerable to contamination, emphasizing the need for effective wastewater treatment to protect both surface and groundwater resources.