Patent ID: 7413656

Claim:
In an aerating type of sewage treatment system having a tank for receiving and holding a pool of sewage to be aerated, the method comprising circulating the sewage in the tank with an aerator device which includes a tube extending generally vertically within the tank and a power driven impeller in the tube which induces inflow and mixing of air into the flow through the tube and the pool within the tank, filtering a portion of the flow of sewage into the aerator device with a pervious filter element to collect particulate matter from the flow into the aerator device, and directing at least a portion of the flow through the aerator device against the filter screen to dislodge collected particulate matter therefrom so as to return to the pool and to further actuate a rotating device for brushing particulate matter from the filter element, and, directing part of the effluent passing through the filter screen to the discharge from the tank, and directing at least a portion of the remainder of such effluent back to the aerator device whereby the particulate matter is dispersed within the tank.