Nei Mongol Wastewater Treatment Plant, Linhe District, Inner Mongolia

Nei Mongol is a municipal wastewater treatment plant located in Linhe District (临河区), Bayannur City, Inner Mongolia Autonomous Region, China. The facility serves a population of approximately 630,000, classifying it as a large-scale agglomeration under Chinese regulatory frameworks. Its address is on Fuyuan South Road in Bayi Township, within the urban area of Linhe. As a large plant serving over 600,000 people, Nei Mongol is expected to meet China's Discharge Standard of Pollutants for Municipal Wastewater Treatment Plants (GB 18918-2002), which mandates secondary treatment as a minimum and often requires advanced treatment for sensitive receiving waters. Facilities of this scale in China typically employ activated sludge processes with nutrient removal to comply with Class 1A or 1B effluent standards. The plant discharges treated effluent into local waterways that ultimately drain into the Yellow River basin, a major river system in northern China. The Yellow River downstream supports agricultural irrigation, industrial use, and ecological flows in arid regions. Protecting water quality in this basin is critical for regional water security and ecosystem health, particularly given the semi-arid climate of Inner Mongolia.

The plant is located in the Yellow River basin, approximately 50 km from the main stem of the Yellow River. Treated effluent from the plant flows into local tributaries that join the Yellow River, which then travels eastward through northern China before discharging into the Bohai Sea. The downstream environment includes agricultural areas reliant on Yellow River water for irrigation, as well as ecologically sensitive wetlands and riverine habitats that support migratory birds and aquatic species. Maintaining low nutrient and pollutant loads is essential to prevent eutrophication and protect downstream water quality.