Heilongjiang Wastewater Treatment Plant, Shuangyashan, Heilongjiang Province

Heilongjiang wastewater treatment plant is located in Shuangyashan City, Heilongjiang Province, China. The facility serves a population of approximately 272,500, classifying it as a medium-to-large agglomeration under Chinese wastewater management standards. The plant is situated in an inland area, more than 50 km from the coast, and discharges into local water bodies. Under China's national wastewater discharge standards, plants serving populations over 100,000 are typically required to achieve secondary treatment with nutrient removal, in line with the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918-2002). The plant's operational context is shaped by these regulations, which mandate effluent quality standards for biochemical oxygen demand, chemical oxygen demand, suspended solids, and nutrients. The treated effluent from the plant ultimately flows into the local river system within the Heilong River basin. The Heilong River (Amur River) is a major transboundary waterway that drains into the Sea of Okhotsk. The plant plays a key role in protecting downstream water quality and aquatic ecosystems in this important basin.

The plant discharges into the local river network within the Heilong River basin, which flows northeast through China and Russia before emptying into the Sea of Okhotsk. The basin supports diverse aquatic life and is an important migratory corridor for fish species. Protecting water quality in this basin is critical for maintaining ecological balance and supporting downstream communities.