Hebei Wastewater Treatment Plant, Zanhuang County, Shijiazhuang

The Hebei wastewater treatment plant is located in Zanhuang County, Shijiazhuang City, Hebei Province, China. It serves a population of approximately 40,000, classifying it as a medium-sized municipal facility within the region's wastewater infrastructure. As a Chinese treatment plant, it operates under the national 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 serving populations around 40,000, secondary treatment with nutrient removal is typically required to meet Class 1-A or 1-B standards, depending on local watershed protection needs. The plant discharges treated effluent into local water bodies that ultimately flow into the Hai River system, which drains into the Bohai Sea. This downstream connection underscores the plant's role in protecting both inland freshwater ecosystems and the coastal marine environment of the Bohai Gulf.

The plant's treated effluent enters local streams that are part of the Hai River basin, which flows eastward into the Bohai Sea. The Hai River system supports diverse aquatic life and provides water for agricultural and industrial use in Hebei Province. The Bohai Sea is a semi-enclosed marginal sea with significant ecological importance, hosting fisheries and migratory bird habitats. Effective wastewater treatment is critical to prevent eutrophication and protect downstream water quality.