Multi-chamber septic tank assembly

Claim 1

A septic tank assembly comprising: a first vessel encompassing a space; a second vessel nested with said first vessel and co-operating therewith to divide said space into two sub-spaces; partition means co-operating with the two vessels to divide said sub-spaces into four treatment chambers which are generally vertically coextensive; an inlet duct communicating with a first one of said chambers to deliver waste water thereto for anaerobic treatment; a first transfer duct extending from an upper portion of said first chamber to said second chamber where the discharge from said first chamber is aerobically treated; a second transfer duct extending from an upper portion of said second chamber to said third chamber where the discharge of said second chamber is subjected to a clarification treatment; a third transfer duct extending from an upper portion of said third chamber to a fourth one of said chambers where the discharge of said third chamber is disinfected; an outlet duct from said fourth chamber through which treated water exits from within said assembly; an aeration device including an air pump and conduits to deliver air to a lower portion of said second chamber so that air passes upwardly through liquid contained within said second chamber; a first conveyor means extending from a lower portion of said third chamber to said first chamber to transfer solid matter from said third chamber to said first chamber; second conveyor means extending from an upper portion of said third chamber to said first chamber to transfer floating matter from said third chamber to said first chamber; and a sterilizing agent dispenser to deliver a sterilizing agent into said fourth chamber.