Hunan Wastewater Treatment Plant, Changning, Hunan Province, China

The Hunan wastewater treatment plant is located in Changning City, Hunan Province, China, serving a population of approximately 163,500. The plant is situated in the Xiang River basin, a major tributary of the Yangtze River, and plays a key role in managing municipal wastewater for this urban area. As a large agglomeration serving over 150,000 people, 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 plants of this scale. The facility likely employs biological treatment processes such as activated sludge to achieve compliance with national effluent limits. The treated wastewater is discharged into local waterways that flow into the Xiang River, which ultimately drains into Dongting Lake and then the Yangtze River. This downstream chain supports extensive aquatic ecosystems and provides water for agriculture and industry in the region. Proper treatment is essential to protect water quality in this densely populated and economically active watershed.

The plant discharges into the Xiang River basin, a tributary of the Yangtze River. The Xiang River flows through Hunan Province into Dongting Lake, a large freshwater lake that supports diverse aquatic life and migratory birds. Downstream, the waters join the Yangtze River, which is ecologically significant for its role in sustaining fisheries and biodiversity in central China. Effective wastewater treatment is critical to prevent eutrophication and protect these water bodies.