Nei Mongol Wastewater Treatment Plant, Harqin Banner, Inner Mongolia

The Nei Mongol wastewater treatment plant is located in Harqin Banner (喀喇沁旗), a county-level division within Chifeng City (赤峰市), Inner Mongolia Autonomous Region, China. The facility serves a population of approximately 33,000 residents, placing it in the small-to-medium agglomeration category for Chinese municipal wastewater infrastructure. China's wastewater treatment regulations, governed by the Ministry of Ecology and Environment, require secondary treatment as a baseline for urban plants. For facilities serving populations around 30,000, typical treatment processes include activated sludge or biological nutrient removal, with effluent standards set by the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918-2002). It operates within this national regulatory framework. The plant discharges treated effluent into local waterways that ultimately drain into the Liao River basin, a major river system in Northeast China. The Liao River flows into the Bohai Sea, supporting diverse aquatic ecosystems and agricultural irrigation downstream. Proper treatment at this facility helps protect water quality in the region's semi-arid environment, where water resources are critical for both human use and ecological health.

The plant's treated effluent enters local streams that feed into the Liao River system, which flows eastward through Liaoning Province before discharging into the Bohai Sea. The Liao River basin supports important fisheries and agricultural irrigation, and its water quality is regulated under China's Water Pollution Prevention and Control Law. The semi-arid climate of Inner Mongolia makes water conservation and pollution control particularly important for maintaining downstream ecological balance.