Process and apparatus for sewage purification by activated sludge technique

Abstract From the Canadian patent

Title of the Invention, PROCESS AND APPARATUS FOR SEWAGE PURIFICATIOIN BY ACTIVATED SLUDGE TECHNIQUE, ABSTRACT OF THE DISCLOSURE, A sewage treatment facility includes a round reaction tank a round aeration tank which encompasses the reaction tank a, final clarification tank and a sludge return station. The crude sewage is passed in part to the reaction tank and in part to the aeration tank, the partially purified contents of the reaction tank are caused to flow into the aeration tank via an overflow wall the contents of the aeration tank flow for the most part, to the, final clarification tank the activated sludge separated from the purified water in the final clarification tank is …