GB605046A - Improvements in or relating to diffusers for diffusing gases into liquids - Google Patents

Abstract

605,046. Aerating liquids. ACTIVATED SLUDGE, Ltd., and COOMBS, E. P. July 25, 1944, Nos. 14159 and 14160. [Class 14(i)] [Also in Group I] Apparatus for diffusing gases into liquids, as for example air into sewage, comprises a diffuser pipe having an inlet for gas and a plurality of outlets spaced along the length of the pipe and closed by detachable domes or hollow bodies having lateral porous walls, sealing means to prevent leakage of gas being provided between each dome and the pipe. Preferably the. height of each dome does not exceed 4¢ inches. In the construction shown in Fig. 1, an aerating tank 1 foruse in sewage purification is provided with a diffuser pipe 10 formed with holes over which are mounted porous domes 12. Air is delivered to the domes by way of pipe 14 connected to the pipe 10 by an elbow joint 15 and an expansion joint 16. Both joints may be provided each with a dome. In a modification two rows of domes, one row staggered with respect to the other row, are mounted on a pipe which is supported in the lower part and towards one end of the tank. The domes may be of the form shown in Fig. 10, in which the dome 23 and a box plate 22 are clamped to each other and to a diffuser pipe 10 by means of a screw-threaded tube 24 and two nuts 26, 27. Air enters the dome through an opening 31 covered by a rubber tube 32 which prevents any back flow of liquid to the pipe 10. In a modification shown in Fig. 11, the dome 37 is secured to the pipe 10 by a rod 34 and the air enters the dome through openings 35 normally closed by a collar 36 which can be raised by the air pressure. In a further modification the dome is of conical form and the flow of air is past a ball valve.