Hebei Wastewater Treatment Plant, Weixian County, Hebei Province, China

The Hebei wastewater treatment plant is located in Weixian County, Hebei Province, China, along G106. It serves a population equivalent of approximately 75,000, classifying it as a medium-sized municipal facility within China's wastewater infrastructure. The plant is situated inland, away from coastal areas, and its treated effluent is discharged into local rivers that ultimately flow into the Bohai Sea via the Hai River system. As a plant serving a population of 75,000, it falls under China's Discharge Standard of Pollutants for Municipal Wastewater Treatment Plants (GB 18918-2002). This standard mandates secondary biological treatment with nutrient removal for plants of this scale, with effluent limits for COD, BOD, ammonia nitrogen, and total phosphorus. Typical facilities in this region employ activated sludge processes with anaerobic-anoxic-oxic (A2O) configurations to meet Class 1A or 1B discharge standards. The plant's receiving water body is part of the Hai River basin, which drains a densely populated agricultural and industrial region. The Hai River system flows into the Bohai Sea, a semi-enclosed sea with significant eutrophication concerns. The plant's discharge contributes to the nutrient load in the basin, and its compliance with national standards is critical for protecting downstream water quality and the marine environment of the Bohai Sea.

The plant discharges into the Hai River basin, which flows through Hebei Province and ultimately into the Bohai Sea. The Bohai Sea is a semi-enclosed marginal sea with limited water exchange, making it susceptible to nutrient pollution and algal blooms. The Hai River system receives agricultural runoff and industrial discharges from the region, and the plant's effluent must meet stringent nutrient limits to mitigate eutrophication risks in the downstream estuary and coastal waters.