Hunan Wastewater Treatment Plant, Lanshan County, Yongzhou, Hunan Province

Hunan wastewater treatment plant is located in Lanshan County, Yongzhou, Hunan Province, China. The facility serves a population of approximately 72,100, making it a medium-sized agglomeration under Chinese wastewater management standards. It plays a key role in managing municipal wastewater in this inland region of southern China. As a plant serving over 70,000 people, it is expected to meet secondary treatment standards under China's Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918-2002). This regulation sets effluent limits for biochemical oxygen demand, chemical oxygen demand, suspended solids, and nutrients to protect receiving waters. The plant's operation is part of China's broader efforts to expand wastewater treatment coverage under the Water Pollution Prevention and Control Action Plan. The treated effluent likely discharges into a tributary of the Xiang River, which flows into Dongting Lake and ultimately the Yangtze River. The Xiang River basin supports diverse aquatic life and provides water for agriculture and industry. Proper treatment at this plant helps reduce nutrient and pollutant loads, protecting downstream ecosystems and water quality in the Yangtze River system.

The plant discharges into a tributary of the Xiang River, which flows northward into Dongting Lake, a major freshwater lake in Hunan, and then into the Yangtze River. The Xiang River basin is ecologically significant, supporting fish species and migratory birds. Nutrient pollution from untreated wastewater can cause eutrophication in Dongting Lake, so effective treatment at this plant helps maintain water quality and aquatic habitat in the downstream watershed.