Hunan Wastewater Treatment Plant, Dong'an County, Hunan Province

The Hunan wastewater treatment plant is located in Dong'an County, Yongzhou, Hunan Province, China. It serves a population of approximately 132,000, classifying it as a medium-to-large agglomeration under Chinese wastewater regulations. The plant is situated in the inland region of Hunan, away from coastal areas. Under China's national wastewater discharge standards, plants of this scale are typically required to meet Class 1A or 1B effluent limits, which involve biological treatment with nutrient removal. The plant likely employs conventional activated sludge or similar secondary treatment technology to comply with these standards. The treated wastewater is discharged into local rivers that eventually flow into the Yangtze River basin. The plant plays a crucial role in protecting downstream water quality and supporting the ecological health of the region's freshwater systems, which are vital for agriculture and biodiversity.

The plant discharges into local tributaries of the Xiang River, a major branch of the Yangtze River system. The downstream environment supports diverse aquatic life and provides water for irrigation and domestic use. Protecting this watershed is essential for maintaining water quality in the Yangtze basin, which faces pressures from industrial and agricultural runoff.