Device for the removal of floating debris in of sediment basin

摘要

373,931. Gravity-separa,tion apparatus. DORR CO., Inc., 247, Park Avenue, New York, U.S.A. Nov. 16, 1931, No. 31669. Convention date, Nov. 25, 1930. [Class 46.] The scum in a settling tank is collected by a rotating baffle against a scoop which moves horizontally to eject it over a weir into a scumdischarge chamber. The material under treatment is supplied to the settling tank 10, Figs. 1 and 2, from a channel 32 through an opening 36 behind a baffle 37, the outer wall 33 of the channel 32 constituting a weir. The effluent liquid leaves through a slot 38 and passes over a weir 39 to a channel 40. Settled sludge is collected to a gutter 12 by rakes 19 supported by arms 17 attached to a drum 16 rotating on a central column 13. The drum 16 is rotated by means of a truss 21, the outer end of which is supported on a wheel 22 which is driven on a rail 23 surrounding the tank by an electric motor 24. An auxiliary blade 28 supported from the truss 21 collects settled matter from the corners of the base. The truss 21 carries a baffle 42 which collects the scum as it rotates and directs it towards a sweep 54. The sweep 54 is pivoted at its outer end and drawn by a weighted chain 56 so that its inner end engages the baffle 42, which extends around the truss and is curved at the inner end. The arrangement is such that as the baffle 42 approaches the sweep 54 and collects scum in the space between them, the sweep 54 is closed against the side of the tank and forces scum through an adjustable slot in the wall into a chamber 45. The sweep 54 closes the slot while the baffle 42 is passing and during this time valves in base of the chamber 45 are automatically opened so that the scum is discharged without loss of liquid. Fig. 4 shows modified apparatus in which curved sweeps 54a operated by a rotary baffle 42a in the manner described above force out scum into discharge chambers 85 at the corners of the tank.