Patent ID: 7178677

Claim:
An aeration vessel for use in an aerobic wastewater treatment system comprising: a bottom section component comprising an inverted frustoconical side wall, having an upper edge, a first annular, radially outwardly extending flange extending from said upper edge, said first flange forming an annular, axially upwardly facing, first mating surface, and a bottom wall; a top section component comprising a frustoconical side wall having a lower edge, and a top edge, a second annular, radially outwardly extending flange extending from said lower edge, said second flange forming an annular, axially downwardly facing second mating surface, said top section component further including an annular, radially inwardly extending top flange extending from said top edge, said top flange forming an annular, axially downwardly facing, first connection surface; and a partition component disposed in said aeration vessel, said partition component comprising an inverted frustoconical partition wall having a bottom mouth and an upper, partition edge, an annular, radially outwardly extending partition flange extending from said upper partition edge, said partition flange forming an annular, axially upwardly facing, second connection surface; said first and second mating surfaces being in sealing engagement, said first and second connection surfaces being mated together; and said bottom section component being nestable with a second bottom section component substantially identical to said bottom section component, said top section component being nestable with a second top section component substantially identical to said top section component, and said partition section component being nestable with a second partition section component substantially identical to said partition section component.