Sewage treatment workers refer to engineers who specialize in separating or converting pollutants contained in sewage into harmless substances by various methods, thus purifying sewage. It mainly removes suspended solid pollutants from sewage, and most physical treatment methods can only meet the requirements of primary treatment. After primary treatment, BOD can generally be removed by about 30%, which can not meet the discharge standard. Primary treatment belongs to the pretreatment of secondary treatment.

Anhui Province is an important part of the Yangtze River Delta, at the strategic crossroads of national economic development, and is the junction of several major economic sectors in China. Its economy, culture and other areas of the Yangtze River Delta have historical and natural ties. Anhui culture has a long history and consists of Huizhou culture, Huaihe culture, Wanjiang culture and Luzhou culture.