Heilongjiang Wastewater Treatment Plant, Dayushu Town, Fujin City, Heilongjiang

The Heilongjiang wastewater treatment plant is located in Dayushu Town, Fujin City, within the Heilongjiang province of China. It serves a population of approximately 110,000 people, classifying it as a medium-to-large agglomeration under Chinese wastewater management frameworks. The plant is situated in an inland area, more than 50 kilometers from the coast, and its operations are subject to China's national discharge standards, which mandate secondary treatment for urban wastewater. As a facility serving a significant population, the plant is expected to meet the requirements of China's Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918-2002), which sets limits for key pollutants such as COD, BOD, ammonia nitrogen, and total phosphorus. Plants of this scale typically employ biological treatment methods such as activated sludge or sequencing batch reactors to achieve compliance. The treated effluent from the plant is discharged into local water bodies within the Songhua River basin, which ultimately flows into the Amur River (Heilongjiang) and then to the Sea of Okhotsk. The plant plays a crucial role in protecting the water quality of the Songhua River and its downstream ecosystems, supporting aquatic life and agricultural water use in the region.

The plant discharges into the Songhua River basin, a major tributary of the Amur River (Heilongjiang), which flows through northeastern China and Russia before reaching the Sea of Okhotsk. The watershed supports diverse aquatic species and provides water for irrigation and industry. Proper treatment is essential to prevent eutrophication and protect downstream ecosystems, including important fish habitats.