Sichuan Wastewater Treatment Plant, Jiajiang County, Leshan, Sichuan

The Sichuan wastewater treatment plant is located in Jiajiang County, part of Leshan City in Sichuan Province, China. It serves a population of approximately 54,300, placing it in the medium agglomeration category for Chinese municipal wastewater infrastructure. As a plant in China, it is subject to the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918-2002), which sets effluent limits for COD, BOD, ammonia nitrogen, and total phosphorus. For plants serving populations of this scale, secondary treatment with nutrient removal is typically required, especially in sensitive water basins. The plant's treated effluent likely discharges into a local river within the Yangtze River basin, which ultimately flows into the East China Sea. The region's aquatic ecosystems benefit from proper wastewater treatment, reducing nutrient loading and protecting downstream biodiversity in the Yangtze River system.

The plant is situated in the Yangtze River basin, with treated effluent likely entering a tributary of the Min River, which flows into the Yangtze and eventually the East China Sea. The downstream environment supports diverse aquatic life and provides water for agriculture and fisheries. Effective treatment helps mitigate eutrophication risks in the Yangtze estuary.