Gansu Wastewater Treatment Plant, Wujia Ba, Gansu Province

The Gansu wastewater treatment plant is located in Wujia Ba, Cheng County, within the Longnan City area of Gansu Province, China. It serves a population equivalent of approximately 35,600, placing it in the medium-scale category for municipal wastewater treatment in the region. As a facility in China, the plant is subject to the national Discharge Standard of Pollutants for Municipal Wastewater Treatment Plants (GB 18918-2002), which sets effluent limits based on the receiving water's environmental sensitivity. For inland plants like this one, Grade 1-A or 1-B standards typically apply, requiring biological treatment with nutrient removal. The plant discharges treated effluent into local waterways that ultimately drain into the Yangtze River basin via the Jialing River system. This inland location means the effluent contributes to freshwater resources used for agriculture and downstream communities, making effective treatment essential for protecting water quality and aquatic ecosystems.

The plant's treated effluent flows into the Jialing River system, a major tributary of the upper Yangtze River. This watershed supports diverse aquatic life and provides water for irrigation and domestic use in the region. The facility's inland location and proximity to the Yangtze basin underscore the importance of maintaining nutrient removal to prevent eutrophication in downstream reservoirs and lakes.