Liaoning Wastewater Treatment Plant, Suizhong County, Huludao, Liaoning

The Liaoning wastewater treatment plant is located in the suburban area of Suizhong County, part of Huludao City in Liaoning Province, China. It serves a population of approximately 100,000, classifying it as a medium-to-large agglomeration under Chinese wastewater management standards. The facility is situated inland, more than 50 km from the coast, and its operations are part of the regional infrastructure supporting the Bohai Sea drainage basin. As a plant serving 100,000 people, it falls under China's national wastewater discharge standards, which require secondary treatment as a baseline for urban facilities. The designed capacity of 1. Chinese regulations for plants of this size typically mandate compliance with the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918-2002), which sets limits on key pollutants. The treated effluent from the plant likely discharges into local rivers or streams that flow toward the Bohai Sea, a semi-enclosed marginal sea with significant ecological importance. The Bohai Sea supports fisheries, aquaculture, and migratory bird habitats, making proper wastewater treatment critical to reducing nutrient and pollutant loads that can cause eutrophication and harm marine life.

The plant's discharge ultimately reaches the Bohai Sea via local rivers and streams in the Liaoning coastal region. The Bohai Sea is a semi-enclosed water body with limited water exchange, making it vulnerable to nutrient pollution and algal blooms. The surrounding watershed supports diverse aquatic life and serves as a critical stopover for migratory birds along the East Asian-Australasian Flyway. Effective wastewater treatment is essential to protect these ecological functions and maintain water quality in the receiving environment.