B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
B01D 21/06 (2006.01) B01D 21/24 (2006.01)
Patent
CA 2044375
A scum skimming device is disclosed for use in a waste treatment system having a circular sedimentation tank. Such tanks typically have a central waste liquid inlet pipe having inlet ports and an outlet weir around the periphery to maintain the waste liquid level in the tank at a predetermined desired level. The scum skimming device consists of at least one scum skimming blade which is biased into a position partly above and partly below the liquid surface and which sweeps the surface of the tank, the blade being supported from a bottom sludge rake by articulated support posts. The device also consists of a generally helical blade extending to the tank periphery and. being positioned with a portion of the helical blade below the waste liquid level when the tank is in use, and a drive means for rotating the generally helical blade. A trough is provided partially enclosing the helical blade, the trough having an open side at about the liquid level to allow floating scum to enter the trough and encounter the helical blade. In use, the scum skimming blade directs the scum through the trough opening and into contact with the helical blade, and the helical blade is rotated by the drive unit in a manner tending to keep the scum in the trough while moving the scum lengthwise along the trough to a discharge point outside the tank. In a further embodiment, the trough contains a sloped portion rising above the liquid level to allow the liquids to drain from the scum being transported.
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
Brandkvist Jan O.
LandOfFree
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