Yunnan Wastewater Treatment Plant, Wenshan City, Yunnan Province

The Yunnan wastewater treatment plant is located in Wenshan City, Wenshan Zhuang and Miao Autonomous Prefecture, Yunnan Province, China. It serves a population equivalent of 379,100, classifying it as a large-scale municipal facility within the region. As a large agglomeration, the plant is expected to meet China's Discharge Standard of Pollutants for Municipal Wastewater Treatment Plants (GB 18918-2002), which mandates secondary treatment with nutrient removal for facilities of this scale. Regulatory requirements ensure adequate treatment before discharge. The plant discharges treated wastewater into local water bodies that ultimately drain into the Red River system, which flows through Vietnam into the South China Sea. This downstream connection highlights the plant's role in protecting both local aquatic ecosystems and transboundary water quality.

The plant's receiving water body is part of the Red River basin, which flows through Yunnan and northern Vietnam before reaching the Gulf of Tonkin in the South China Sea. This watershed supports diverse aquatic life and provides water for agriculture and communities downstream. Effective treatment is critical to prevent nutrient pollution and maintain ecological balance in this internationally shared river system.