Sichuan Wastewater Treatment Plant, Maerkang (Barkam), Sichuan, China

The Sichuan wastewater treatment plant is located in Maerkang (Barkam), a city in the Ngawa Tibetan and Qiang Autonomous Prefecture of Sichuan Province, China. It serves a population of approximately 22,700, classifying it as a medium-sized agglomeration under Chinese wastewater management frameworks. As a municipal facility in China, the plant is subject to the 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 plants of this scale, secondary treatment with nutrient removal is typically required to meet Class 1A or 1B standards, especially if discharging into sensitive water bodies. The plant's treated effluent likely discharges into a local river within the Dadu River basin, which flows into the Yangtze River system. The region's mountainous terrain and proximity to the Dadu River underscore the importance of effective wastewater treatment to protect downstream aquatic ecosystems and water quality in the Yangtze River basin.

The plant is situated in the Dadu River watershed, a tributary of the Yangtze River. The Dadu River flows through mountainous terrain in western Sichuan before joining the Min River and eventually the Yangtze. This region supports diverse aquatic life and provides water for agriculture and communities downstream. Proper treatment is essential to prevent nutrient pollution and maintain ecological health in the Yangtze River system.