Guangdong Wastewater Treatment Plant, Sihui, Zhaoqing | Pearl River Basin

The Guangdong wastewater treatment plant is located in Sihui, a county-level city under Zhaoqing, Guangdong Province, China. It serves a population of 260,000, classifying it as a large agglomeration under Chinese wastewater management standards. The plant is situated in the Pearl River Delta region, a densely populated and economically vital area. As a large-scale facility, the plant is expected to meet the discharge standards set by China's Water Pollution Prevention and Control Law and the national discharge standard GB 18918-2002. For agglomerations of this size, secondary treatment with nutrient removal is typically required, especially in sensitive water bodies. Regulatory compliance is assumed. The treated effluent is discharged into local waterways that ultimately flow into the Pearl River system, which drains into the South China Sea. The Pearl River Delta is a critical ecological and economic zone, supporting diverse aquatic life and providing water for millions. The plant plays a key role in protecting downstream water quality and public health.

The plant discharges into the Pearl River basin, which flows through Guangdong and into the South China Sea. The Pearl River Delta is a densely populated and industrialized region, making wastewater treatment essential for controlling nutrient and pollutant loads. The downstream environment supports important fisheries and migratory bird habitats, and the plant helps mitigate eutrophication risks in coastal waters.