Henan Wastewater Treatment Plant, Linying County, Henan Province, China

The Henan wastewater treatment plant is located in Mazhuang, Linying County, within the city of Luohe in Henan Province, China. It serves a population of approximately 132,400, classifying it as a medium-to-large agglomeration under Chinese wastewater management standards. As a plant in China, it is subject to the national Discharge Standard of Pollutants for Municipal Wastewater Treatment Plants (GB 18918-2002), which sets effluent limits based on receiving water sensitivity. For plants serving over 100,000 people, advanced treatment with nutrient removal is typically required to meet Class 1-A standards, especially if discharging into sensitive water bodies. The plant's treated effluent likely discharges into a local river within the Huai River basin, which ultimately flows into the East China Sea. The Huai River basin is ecologically significant, supporting agriculture and fisheries, and has faced challenges from industrial and urban pollution. Proper treatment at this plant helps protect downstream water quality and aquatic ecosystems.

The plant is located in the Huai River basin, a major watershed in eastern China that drains into the East China Sea. The Huai River and its tributaries support extensive agricultural irrigation and freshwater fisheries. Downstream ecosystems include wetlands and lakes that provide habitat for migratory birds and aquatic species. Effective wastewater treatment is critical to prevent eutrophication and maintain water quality in this densely populated and agriculturally intensive region.