Hunan Wastewater Treatment Plant, Hongjiang, Hunan Province

The Hunan wastewater treatment plant is located in Qianyang Town, Hongjiang City, within the Hunan Province of China. It serves a population of approximately 55,300, classifying it as a medium-sized agglomeration 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 body's sensitivity. Plants of this scale typically employ secondary biological treatment with nutrient removal to meet Class 1A or 1B standards. The plant discharges treated effluent into local waterways that ultimately drain into the Yuan River, a tributary of the Yangtze River system. The Yuan River flows through western Hunan and supports diverse aquatic life, including several endemic fish species. Proper treatment is essential to protect water quality in this ecologically significant watershed.

The plant's treated effluent enters local streams that feed into the Yuan River, which flows eastward through Hunan Province before joining the Yangtze River. The Yuan River basin supports a variety of freshwater habitats and is important for regional biodiversity, including migratory fish species. Downstream, the Yangtze River estuary is a critical ecological zone for fisheries and wetland ecosystems.