Zhejiang Wastewater Treatment Plant, Haining, Zhejiang Province, China

The Zhejiang wastewater treatment plant is located in Haining City, Zhejiang Province, China, along Zhongdi Road in Chang'an Town. It serves a population equivalent of 160,000, classifying it as a medium-to-large agglomeration under Chinese municipal wastewater management. The plant's designed capacity is 1. As a facility in China, the plant is subject to the 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 phosphorus. For plants serving over 100,000 people, advanced treatment with nutrient removal is typically required to meet Class 1A standards, especially in sensitive watersheds. Regulatory compliance is expected. The treated effluent is discharged into local waterways that ultimately drain into the East China Sea via the Qiantang River system. The region is part of the Yangtze River Delta, a densely populated and economically vital area. The plant plays a key role in protecting downstream aquatic ecosystems and supporting water quality in the Hangzhou Bay area.

The plant discharges into the Qiantang River basin, which flows into Hangzhou Bay and then the East China Sea. This watershed supports diverse aquatic life and is important for fisheries and coastal ecology. The region faces challenges from industrial and agricultural runoff, making effective wastewater treatment critical for maintaining water quality and preventing eutrophication in downstream coastal waters.