Liquid purification or separation – Recirculation – Serially connected distinct treating or storage units
Patent
1975-08-27
1977-09-06
Miles, Tim R.
Liquid purification or separation
Recirculation
Serially connected distinct treating or storage units
210242R, 210256, 210525, 210527, B01D 2112, C02B 136, C02C 116, C02C 130
Patent
active
040466930
ABSTRACT:
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 clarifying 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 ballast 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.
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Clements Gregory N.
Harsco Corporation
Miles Tim R.
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