Hainan Wastewater Treatment Plant, Chengmai County, Hainan, China

The Hainan wastewater treatment plant is located in Chengmai County, Hainan Province, China. It serves a population of approximately 100,000, 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 standards set by the Ministry of Ecology and Environment, which mandate secondary treatment for urban wastewater. For agglomerations of this size, compliance with the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918-2002) is typical, requiring effective removal of organic matter and nutrients to protect receiving waters. The treated effluent from the plant is discharged into local water bodies that ultimately drain into the South China Sea. The surrounding watershed supports diverse aquatic life and is important for regional water quality. The plant plays a key role in mitigating pollution from urban runoff and domestic wastewater in this coastal province.

The plant discharges into local rivers and streams that flow into the South China Sea, a semi-enclosed sea with significant ecological importance. The watershed supports mangrove forests, coral reefs, and fisheries, making nutrient and pollutant control critical. The plant's operations help reduce eutrophication risks and protect downstream marine habitats.