Patent ID: 6132601
Filing Date: 2000-10-17
Classification: C02F,Y02W,Y10S

Abstract:
In an improved rotary digester for raw sewageA. of the kind comprising:(a) a horizontal cylindrical shell;(b) end members for said shell forming liquid-tight seals with said shell;(c) rotating means adapted to rotate said shell about its long axis;(d) a plurality of reaction cylinders mounted within said shell, concentric thereto, whereby there are defined a central axial channel and a plurality of annular channels encircling said axial channel at successively greater radial distances from said axis said reaction cylinders adapted to be rotated with said shell;(e) end members for each of said reaction cylinders; and(f) said central axial channel having on end thereof in fluid communication with said annular channel adjacent thereto, each of said annular channels being in fluid communication with the next adjacent annular channel, at alternating ends, thereby defining a liquid-flow path through the length of said central channel and then back and forth through each of the successive channels;B. the further combination of:(a) axial feed means adapted to introduce feed into one end of said axial channel;(b) gas supply means for delivering air/gas to said feedstock; and(c) wherein a plurality of air/gas distribution means are longitudinally disposed parallel to the axis of said shell and spaced apart effectively to aerate the contents of said digester;wherein the improvement comprises:an air-flow modulating and distribution valve, said modulating and distribution valve having input from a cylindrical plenum coaxial with said main axis, and a manifold for distribution to said air/gas means comprising a plurality of arms removable through ports in one of the end members of said shell.