Nei Mongol Wastewater Treatment Plant, Yuanbaoshan, Chifeng, Inner Mongolia

The Nei Mongol wastewater treatment plant is located in Yuanbaoshan district, Chifeng City, Inner Mongolia Autonomous Region, China. It serves a population equivalent of approximately 60,000, classifying it as a medium-sized municipal facility within the region's wastewater infrastructure. Under China's national wastewater discharge standards (GB 18918-2002), plants serving populations of this scale are typically required to achieve at least secondary treatment to protect receiving water bodies. The facility operates within the regulatory framework of China's Water Pollution Prevention and Control Law, which mandates compliance with discharge limits for key pollutants. The plant's treated effluent is discharged into local waterways that ultimately drain into the Liao River basin, a major river system in northeastern China. The Liao River flows into the Bohai Sea, supporting diverse aquatic ecosystems and providing water for agricultural and industrial use downstream.

The plant's discharge contributes to the Liao River basin, which flows through Inner Mongolia and Liaoning Province before reaching the Bohai Sea. The Liao River watershed supports important fisheries and agricultural irrigation, and its water quality is critical for downstream communities. The Bohai Sea is a semi-enclosed marginal sea with significant ecological and economic importance, hosting diverse marine life and major ports.