Liaoning Wastewater Treatment Plant, Shahekou District, Dalian | Serving 500,000 People

Liaoning wastewater treatment plant is a major municipal facility serving approximately 500,000 residents in the Shahekou District of Dalian, Liaoning Province, China. The plant is situated in a densely populated urban area along the southern coast of the Liaodong Peninsula, part of the broader Dalian metropolitan region. As a large-scale agglomeration serving half a million people, the plant operates under China's national wastewater discharge standards, which are aligned with the country's Water Pollution Prevention and Control Law. For plants of this size, secondary treatment with nutrient removal is typically required to meet Class 1A or 1B discharge limits, depending on the receiving water's sensitivity. The designed capacity is reported as 1.00 (likely in 10,000 m³/d or similar units), indicating a substantial treatment volume. The treated effluent ultimately reaches the Yellow Sea, a semi-enclosed marginal sea of the Pacific Ocean. The coastal waters near Dalian support diverse marine life, including fisheries and aquaculture, and are ecologically sensitive to nutrient loading. The plant's discharge contributes to the overall water quality management in the region, which faces pressures from urbanization and industrial activity.

The plant discharges into local waterways that drain into the Yellow Sea, a semi-enclosed sea with limited water exchange. This coastal environment supports important fisheries and migratory bird habitats. Nutrient and pollutant loads from urban runoff and treated effluent require careful management to prevent eutrophication and maintain marine ecosystem health.