Zhejiang Wastewater Treatment Plant, Pingyang County, Wenzhou | China

The Zhejiang wastewater treatment plant is located in Pingyang County, Wenzhou, Zhejiang Province, China. It serves a population of 262,000, classifying it as a large agglomeration under Chinese wastewater management standards. The plant's designed capacity is 1. As a large-scale facility in China, the plant is subject to national wastewater discharge standards under the Environmental Protection Law and the Water Pollution Prevention and Control Law. These regulations require secondary treatment as a minimum, with tertiary treatment often mandated for sensitive water bodies or densely populated areas. Facilities of this size typically employ biological treatment processes such as activated sludge. The plant's location within 50 km of the coast means its treated effluent likely discharges into rivers or streams that flow into the East China Sea. The receiving water body is not named, but the region's watershed includes the Ou River system, which drains into the East China Sea near Wenzhou. This coastal discharge point underscores the importance of effective nutrient removal to prevent eutrophication in marine environments.

The plant's treated wastewater ultimately reaches the East China Sea via local rivers such as the Ou River. The coastal waters of Zhejiang support diverse marine life and are important for fisheries. Discharge of nutrients like nitrogen and phosphorus can contribute to algal blooms and hypoxia in coastal zones, making advanced treatment crucial for protecting downstream ecosystems.