There are two types of sewage buffer tanks: single-chamber sewage buffer tanks and integrated septic tank buffer tanks. The single-chamber sewage buffer tank is placed after the septic tank in residential areas, while the integrated septic tank buffer tank is connected to the septic tank as a whole. They are connected to the septic tank through an intelligent diversion well. On sunny days, residential sewage enters the downstream combined pipe directly after passing through the septic tank and entering the diversion well. During moderate to heavy rain, the pollution interception pipeline in the diversion well is closed. The domestic sewage from the residential area passes through the septic tank and enters the sewage buffer tank for storage, avoiding overflow pollution during rainy days and ensuring that only sewage enters the combined pipe.