Hunan Wastewater Treatment Plant, Heshan District, Yiyang | China

Hunan wastewater treatment plant is located in Heshan District, Yiyang, within Hunan Province, China. The facility serves a population of approximately 257,300, classifying it as a medium-to-large agglomeration under Chinese wastewater management standards. The plant is situated in an inland urban area, contributing to the regional sanitation infrastructure. Under China's national wastewater discharge standards (GB 18918-2002), plants serving populations over 100,000 are typically required to achieve at least secondary treatment with nutrient removal, especially in sensitive watersheds. The plant's scale suggests it operates under these regulatory requirements to protect receiving water bodies. The treated effluent from the plant flows into local rivers that are part of the Yangtze River basin, eventually reaching Dongting Lake and the Yangtze River. This discharge pathway underscores the plant's role in safeguarding downstream aquatic ecosystems and water quality in one of China's most important watersheds.

The plant discharges into tributaries of the Yangtze River basin, which ultimately drain into Dongting Lake and the Yangtze River. This watershed supports diverse aquatic life and provides water for agriculture, industry, and drinking water for millions. The plant's nutrient removal performance is critical to preventing eutrophication in Dongting Lake and maintaining ecological balance in the Yangtze estuary.