B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
182/132, 362/16
B01D 21/00 (2006.01) C02F 3/12 (2006.01)
Patent
CA 1057673
ABSTRACT OF THE DISCLOSURE Scum skimmer apparatus having a skimmer blade slideably disposed on support rods extending downwardly from an oscillating bridge which is moveable over the clarifying tank in a biological waste treatment plant. An air tight ballast chamber is secured to the skimmer blade having a source of air communicating with the ballast chamber, the source having a valve for controlling the air flow. As the bridge moves toward the scum trough at one end of the clar- ifying tank the air is evacuated from the ballast chamber, allowing the blade to engage the surface of the liquid. Upon moving away from the scum trough air is pumped into the ballast chamber providing a buoyancy force which raises the skimmer blade away from the surface. When the opposite end of the clarifying tank is reached the skimmer blade is lowered back to the water by venting the air out of the bal- last chamber. A circular treatment tank is provided having spaced concentric walls with partitions therebetween forming alternate aeration and clarifier zones on the periphery thereof with a central digester zone such that separate aeration zones may be used for organic carbon removal and nitrogen removal.
252214
Harsco Corporation
Na
LandOfFree
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