Sichuan Wastewater Treatment Plant, Xichang, Sichuan Province

The Sichuan wastewater treatment plant is located in Xichang, a city in Liangshan Yi Autonomous Prefecture, Sichuan Province, China. The facility serves a population of approximately 48,800, classifying it as a medium-sized agglomeration under Chinese municipal wastewater standards. As a plant in China, it is subject to the national Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918-2002), which sets effluent limits based on receiving water sensitivity. For plants of this scale, secondary treatment with nutrient removal is typically required to meet Class 1-A or 1-B standards, especially if discharging into sensitive water bodies. The plant's treated effluent likely discharges into the Anning River or a tributary, which flows into the Yalong River, a major tributary of the Jinsha River (upper Yangtze). The downstream environment supports diverse aquatic life and provides water for agriculture and communities. Protecting water quality in this basin is critical for the ecological health of the Yangtze River system.

The plant's receiving water body is likely the Anning River, which flows through Xichang and joins the Yalong River, a major tributary of the Jinsha River (upper Yangtze). This watershed supports diverse aquatic ecosystems and provides water for irrigation and domestic use. The region's mountainous terrain and seasonal rainfall patterns influence runoff and dilution capacity, making effective treatment essential to prevent nutrient enrichment and protect downstream biodiversity.