Sichuan Wastewater Treatment Plant, Shuangliu District, Chengdu

The Sichuan wastewater treatment plant is located in Shuangliu District, part of Chengdu, the capital of Sichuan Province, China. It serves a population of 38,800, placing it in the small-to-medium agglomeration category. The plant is situated in the inland urban area of Chengdu, a rapidly developing region in southwestern China. Under China's national wastewater discharge standards (GB 18918-2002), treatment plants serving populations of this scale are typically required to meet Class 1-A or 1-B standards, which mandate secondary treatment with nutrient removal. The plant's design and operation align with these regulatory requirements to protect local water quality. The treated effluent from this plant is discharged into the local water system, which ultimately drains into the Yangtze River basin via the Min River or its tributaries. The Yangtze River is a critical ecological and economic resource, supporting diverse aquatic life and providing water for millions of people downstream. The plant plays a key role in reducing pollution loads to this major river system.

The plant discharges into the Min River system, a major tributary of the Yangtze River. The Yangtze basin supports a rich diversity of fish species, including the endangered Chinese sturgeon, and provides water for agriculture, industry, and domestic use across central and eastern China. Effective treatment at this plant helps mitigate eutrophication and protect downstream ecosystems.