Yunnan Wastewater Treatment Plant, Xuanwei, Yunnan Province, China

The Yunnan wastewater treatment plant is located in Xuanwei City, part of Qujing City in Yunnan Province, China. It serves a population equivalent of 165,000, classifying it as a medium-to-large agglomeration under Chinese wastewater management frameworks. The plant is situated in the Wanshui Street area of Xuanwei, an inland urban center in the mountainous region of eastern Yunnan. As a facility serving over 100,000 people, it 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 plants of this scale. Typical configurations for Chinese plants of this size include activated sludge processes with biological nitrogen and phosphorus removal. The treated effluent likely discharges into a local watercourse that flows into the larger Pearl River system, which ultimately reaches the South China Sea. The plant plays a critical role in protecting downstream water quality, particularly given the region's agricultural and industrial activities. Its operation supports the ecological health of the Pearl River basin, which provides water for millions of people and supports diverse aquatic habitats.

The plant discharges into a tributary of the Pearl River system, which flows through southern China into the South China Sea. The Pearl River basin is one of China's most important water systems, supporting dense populations, agriculture, and industry. Downstream ecosystems include wetlands and estuarine habitats that rely on adequate water quality. The plant's treatment helps mitigate nutrient and pollutant loads that could otherwise contribute to eutrophication and ecological degradation in the river and coastal zone.