Yunnan Wastewater Treatment Plant, Xiangyun County, Yunnan Province

Yunnan wastewater treatment plant is located in Xiangyun County, Dali Bai Autonomous Prefecture, Yunnan Province, China. The facility serves a population equivalent of 49,600, placing it in the medium agglomeration category under Chinese wastewater management frameworks. The plant is situated inland, approximately 50 km from the coast, and discharges into local water bodies. As a municipal treatment facility in China, the plant is subject to the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918-2002), which sets effluent limits for conventional pollutants, nutrients, and heavy metals. For agglomerations of this scale, secondary treatment with nutrient removal is typically required, especially in environmentally sensitive areas. Compliance with national standards is expected. The treated effluent from the plant likely enters a local river system within the Yangtze River basin or a smaller coastal watershed, eventually draining into the South China Sea. The surrounding region features diverse aquatic habitats and agricultural areas that depend on clean water. Proper treatment helps protect downstream ecosystems and supports local water quality objectives.

The plant discharges into a local watercourse within Yunnan's mountainous terrain, which ultimately drains into the South China Sea via the Red River or Pearl River systems. The region supports diverse aquatic life and is important for migratory fish species. Maintaining effluent quality is critical to prevent eutrophication and protect downstream agricultural and ecological water uses.