Hunan Wastewater Treatment Plant, Huayuan Town, Hunan Province, China

The Hunan wastewater treatment plant is located in Huayuan Town, within the Xiangxi Tujia and Miao Autonomous Prefecture of Hunan Province, China. It serves a population of approximately 88,500 residents, placing it in the medium agglomeration category under Chinese wastewater management standards. As a municipal facility in China, the plant operates under the national Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918-2002), which sets effluent limits based on the receiving water's environmental sensitivity. For inland plants like this one, secondary treatment with nutrient removal is typically required to protect freshwater resources. The plant discharges treated wastewater into local waterways that eventually flow into the Yuan River system, a major tributary of the Yangtze River. The Yuan River basin supports diverse aquatic life and provides water for agriculture and communities downstream. Proper treatment is essential to prevent eutrophication and maintain water quality in this ecologically significant region.

The plant's treated effluent enters local streams that drain into the Yuan River, a major tributary of the Yangtze River. The Yuan River basin is ecologically important, supporting diverse freshwater species and providing water for irrigation and drinking. Downstream, the Yangtze River estuary and East China Sea receive the cumulative discharge, making nutrient and pollutant control critical for coastal ecosystem health.