Nei Mongol Wastewater Treatment Plant, Hongshan District, Chifeng, Inner Mongolia

The Nei Mongol wastewater treatment plant is located in Hongshan District, Chifeng City, Inner Mongolia Autonomous Region, China. It serves a population equivalent of approximately 89,000 people, classifying it as a medium-sized agglomeration under Chinese wastewater management frameworks. As a plant in China, it is subject to the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918-2002), which sets effluent limits for organic matter, nutrients, and pathogens. For plants serving populations of this scale, secondary treatment with nutrient removal is typically required, especially in environmentally sensitive areas. The plant discharges treated effluent into local water bodies that ultimately drain into the Liao River basin. The Liao River flows through northeastern China and empties into the Bohai Sea. Protecting this watershed is critical for downstream aquatic ecosystems and regional water quality.

The plant's treated effluent enters the local drainage network within the Liao River basin, which flows eastward through Inner Mongolia and Liaoning Province before discharging into the Bohai Sea. The Liao River watershed supports diverse aquatic life and is an important water resource for agriculture and industry. Downstream ecosystems depend on adequate treatment to prevent eutrophication and contamination.