Shandong Wastewater Treatment Plant, Changyi City, Shandong Province

The Shandong wastewater treatment plant is located in Changyi City, part of Weifang City in Shandong Province, China. It serves a population of approximately 116,900, classifying it as a medium-to-large agglomeration under Chinese wastewater management standards. The plant's designed capacity is 1.00, indicating its scale within the regional infrastructure. As a facility in China, the plant operates under the national Discharge Standard of Pollutants for Municipal Wastewater Treatment Plants (GB 18918-2002), which sets effluent limits based on the receiving water body's sensitivity. For plants serving populations over 100,000, tertiary treatment is often required to meet stricter standards, especially in environmentally sensitive areas. The plant discharges treated wastewater into local water bodies that ultimately drain into the Bohai Sea via the Wei River or other tributaries in the region. Shandong Province is a major industrial and agricultural area, and proper wastewater treatment is critical to protect downstream ecosystems and coastal waters from nutrient pollution and other contaminants.

The plant's receiving water body is likely a tributary of the Wei River system, which flows into Laizhou Bay in the Bohai Sea. The Bohai Sea is a semi-enclosed marginal sea with limited water exchange, making it vulnerable to eutrophication from nutrient loads. Effective treatment at this plant helps reduce nitrogen and phosphorus inputs, supporting the ecological health of the bay and its fisheries.