Hunan Wastewater Treatment Plant, Louxing District, Loudi City, Hunan Province

The Hunan wastewater treatment plant is located in Huangnitang Street, Louxing District, Loudi City, Hunan Province, China. It serves a population of approximately 252,300, classifying it as a medium-to-large agglomeration under Chinese wastewater management standards. Under China's national wastewater discharge standards (GB 18918-2002), plants serving populations over 100,000 are typically required to meet Class 1-A or 1-B effluent limits, which include nutrient removal. Regulatory expectations for this scale include secondary biological treatment with potential advanced nutrient removal. The plant discharges treated wastewater into local water bodies within the Zi River basin, which flows into Dongting Lake and ultimately the Yangtze River. This downstream chain supports extensive aquatic ecosystems and provides water for agriculture and industry in Hunan Province.

The plant's treated effluent enters the Zi River system, a tributary of Dongting Lake, which is a major freshwater lake in the Yangtze River basin. Dongting Lake is ecologically significant as a flood storage basin and supports diverse aquatic life, including migratory fish species. The lake's water quality is sensitive to nutrient inputs, making effective treatment crucial for downstream ecosystem health.