Jilin Wastewater Treatment Plant, Songyuan | Jilin Province, China

The Jilin wastewater treatment plant is located in Songyuan City, Jilin Province, China, serving a population of approximately 146,000. The plant is situated in the Ningjiang District, within the urban area of Songyuan, and plays a key role in managing municipal wastewater for this medium-sized agglomeration. As a plant serving over 100,000 people, it falls under China's stricter wastewater discharge standards, which require secondary treatment as a minimum. It is expected to comply with national effluent standards for urban wastewater treatment plants, including limits on pollutants such as COD, BOD, and ammonia nitrogen. The plant discharges treated wastewater into the local water system, which ultimately drains into the Songhua River basin. The Songhua River flows northeast into the Amur River (Heilongjiang) and eventually reaches the Sea of Okhotsk. The plant's operations are critical for protecting the water quality of the Songhua River, which supports aquatic life and provides water for downstream communities.

The plant's treated effluent enters the local drainage network, which flows into the Songhua River, a major tributary of the Amur River. The Songhua River basin supports diverse aquatic ecosystems and is an important water source for agriculture and industry in northeastern China. Downstream, the Amur River forms the border between China and Russia before emptying into the Sea of Okhotsk. The plant's discharge must meet standards to prevent eutrophication and protect fish habitats in this ecologically sensitive river system.