Liquid purification or separation – Gravitational separator – Mechanical constituent mover
Patent
1990-06-13
1991-09-10
Sever, Frank
Liquid purification or separation
Gravitational separator
Mechanical constituent mover
210541, 210542, B01D 2106
Patent
active
050471511
ABSTRACT:
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.
REFERENCES:
patent: 3919090 (1975-11-01), Shaffer
patent: 4005019 (1977-01-01), Parlette
Drawing No. A1 051 M 010 sheet M10 of M14 dated Jun. 1988.
Drawing No. A1 051 M001 sheet M1 of M 15 dated Jun. 1988.
Drawing No. A1 051 P001 sheet P1 of P9 dated Jun. 1988.
Drawing No. A1 051 P007 sheet P7 of P9 dated Jun. 1988.
Contract No. GC-204 Tender Document, Sep. 1988.
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