Sichuan Wastewater Treatment Plant, Pidu District, Chengdu | China

The Sichuan wastewater treatment plant is located in Tuanjie Subdistrict, Pidu District, Chengdu, Sichuan Province, China. It serves a population of approximately 52,200, classifying it as a medium-sized municipal facility within the urban agglomeration of Chengdu. As a Chinese wastewater treatment plant, it operates under the national Discharge Standard of Pollutants for Municipal Wastewater Treatment Plants (GB 18918-2002), which sets effluent limits for conventional pollutants, nutrients, and heavy metals. For a plant of this scale, secondary treatment with nutrient removal is typically required to meet Class 1-A or 1-B standards, depending on the receiving water's sensitivity. The plant discharges treated effluent into the local water system, which ultimately drains into the Yangtze River basin via the Min River or its tributaries. This region is part of the upper Yangtze watershed, which supports diverse aquatic ecosystems and provides water for agriculture and drinking downstream. Proper treatment is critical to protect water quality in this densely populated and agriculturally active area.

The plant's treated effluent enters the local drainage network within the Min River system, a major tributary of the Yangtze River. The Min River flows through the Sichuan Basin, an ecologically sensitive region that supports endemic fish species and provides irrigation for extensive rice paddies. Downstream, the Yangtze River sustains critical habitats for migratory fish and aquatic biodiversity before reaching the East China Sea. Nutrient and pollutant control at this plant helps prevent eutrophication and maintains water quality for downstream communities and ecosystems.