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