Gansu Wastewater Treatment Plant, Dachuan, Yongjing County, Gansu Province, China

The Gansu wastewater treatment plant is located in Dachuan, Yongjing County, within the Linxia Hui Autonomous Prefecture of Gansu Province, China. It serves a population of approximately 100,000, classifying it as a medium-sized agglomeration under Chinese wastewater management standards. The facility is situated inland, away from coastal areas, and its operations are governed by China's national wastewater discharge standards. As a plant serving around 100,000 people, it is expected to meet secondary treatment requirements under China's Discharge Standard of Pollutants for Municipal Wastewater Treatment Plants (GB 18918-2002). This standard sets limits on biochemical oxygen demand, chemical oxygen demand, suspended solids, and nutrients to protect receiving water bodies. Facilities of this scale typically employ biological treatment methods such as activated sludge or sequencing batch reactors. The plant discharges treated wastewater into local water bodies within the Yellow River basin, as the region is part of the larger Yellow River watershed. The Yellow River is a major waterway in northern China, supporting agriculture, industry, and ecosystems. Downstream, the river flows through arid and semi-arid regions before reaching the Bohai Sea. Proper treatment at this plant helps reduce nutrient and pollutant loads, protecting downstream water quality and aquatic habitats.

The plant is located in the Yellow River basin, one of China's most important river systems. The Yellow River flows through Gansu Province and ultimately discharges into the Bohai Sea. The region experiences a semi-arid climate, making water quality management critical for local agriculture and drinking water supplies. The plant's discharge contributes to the river's flow, and effective treatment helps prevent eutrophication and protects downstream ecosystems, including fish spawning grounds and migratory bird habitats.