Hunan Wastewater Treatment Plant - Heshan District, Yiyang, China

The Hunan wastewater treatment plant is located in Heshan District, Yiyang, Hunan Province, China. It serves a population of approximately 722,500, classifying it as a large-scale municipal facility within the region. As a major treatment plant in Hunan, it is expected to comply with 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 size. The plant's discharge likely meets Class 1-A or 1-B standards, depending on local environmental requirements. The treated effluent is discharged into local waterways that ultimately flow into the Dongting Lake basin, a critical wetland ecosystem. Dongting Lake is a vital flood storage area and supports diverse aquatic life, including migratory birds. The plant plays a key role in protecting downstream water quality and the ecological health of the Yangtze River system.

The plant discharges into tributaries of the Xiang River, which flows into Dongting Lake, a major lake in the Yangtze River basin. Dongting Lake is an ecologically sensitive area that supports diverse aquatic species and serves as a critical stopover for migratory birds along the East Asian-Australasian Flyway. The plant's operations help reduce nutrient and pollutant loads entering this important wetland ecosystem.