Henan Wastewater Treatment Plant, Shangqiu, Henan Province, China

The Henan wastewater treatment plant is located in Sui County, Shangqiu City, Henan Province, China. It serves a population equivalent of approximately 56,100, placing it in the medium-sized agglomeration category for Chinese wastewater infrastructure. Under China's national standards, plants of this scale are typically required to meet Class 1-A or 1-B discharge limits under the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918-2002). Regulatory expectations for this population tier often involve biological treatment with nutrient removal. The plant discharges treated effluent into local waterways that ultimately drain into the Huai River basin, a major river system in eastern China. The Huai River flows eastward into Hongze Lake and eventually reaches the Yellow Sea. The plant plays a role in protecting downstream water quality and aquatic ecosystems in this densely populated agricultural region.

The plant's treated effluent enters local tributaries of the Huai River basin, which flows through Henan and Anhui provinces before reaching Hongze Lake and the Yellow Sea. The Huai River watershed supports extensive agriculture and fisheries, making nutrient control important for preventing eutrophication in downstream lakes and coastal waters.