Nei Mongol Wastewater Treatment Plant, Hailar District, Inner Mongolia

The Nei Mongol wastewater treatment plant is located in Jianshe Subdistrict, Hailar District, Hulunbuir City, Inner Mongolia, China. It serves an estimated population of 260,000, classifying it as a large-scale municipal facility in the region. The plant is situated inland, approximately 50 km from the coast, and its operations are critical for managing urban wastewater in this part of Inner Mongolia. As a large agglomeration serving over 150,000 people, the plant is expected to meet China's Discharge Standard of Pollutants for Municipal Wastewater Treatment Plants (GB 18918-2002), which mandates secondary treatment with nutrient removal for sensitive water bodies. Facilities of this scale typically employ activated sludge processes with biological nutrient removal to comply with national standards. The plant discharges treated effluent into local watercourses that ultimately drain into the Erguna River system, a major tributary of the Amur River (Heilongjiang). The receiving waters support diverse aquatic life and are important for regional agriculture and fisheries. Proper treatment is essential to protect downstream ecosystems and water quality in the Amur River basin.

The plant's treated effluent flows into the Erguna River system, which forms part of the larger Amur River basin. This watershed supports a variety of fish species and provides water for irrigation and livestock. The region experiences a continental climate with cold winters, which can affect treatment efficiency. Downstream, the Amur River discharges into the Sea of Okhotsk, making pollution control important for both freshwater and marine environments.