Buried sewage treatment equipment suitable for residential areas, hospitals nursing homes, office buildings, shopping malls, hotels, restaurants, offices, schools, military units, aquatic plants, livestock processing plants, dairy processing plants with similar domestic sewage and industrial organic waste, such as textiles, beer, paper, leather, food, chemical and other organic wastewater treatment industry, the main purpose is similar with domestic sewage and industrial organic waste water treatment to reuse water quality requirements, the wastewater treatment After the resource utilization. 
 The early 1990s, Shanghai Petrochemical Plant using activated sludge wastewater treatment process polyester production.