Liaoning Wastewater Treatment Plant, Kazuo County, Liaoning Province

The Liaoning wastewater treatment plant is located in Kazuo County (喀喇沁左翼蒙古族自治县), Chaoyang City, Liaoning Province, China. It serves a population of approximately 60,000 residents, placing it in the medium-agglomeration category for Chinese municipal wastewater infrastructure. Under China's national wastewater discharge standards (GB 18918-2002), plants serving populations of this scale are typically required to meet Class 1-A or Class 1-B effluent limits, depending on the receiving water body's sensitivity. Standard practice for similar-sized plants in Liaoning involves biological treatment with nutrient removal. The plant discharges treated effluent into local waterways that ultimately drain into the Bohai Sea via the Daling River system. This region is part of the larger Liao River basin, which supports agricultural irrigation and provides habitat for migratory birds along the East Asian-Australasian Flyway.

The plant's treated effluent flows into tributaries of the Daling River, which empties into the Bohai Sea, a semi-enclosed marginal sea of the Pacific Ocean. The Bohai Sea supports diverse marine life and is an important fishing ground, but faces eutrophication pressures from agricultural runoff and municipal discharges. The local watershed in Liaoning's semi-arid climate relies on these rivers for irrigation and ecological balance.