US PATENT SUBCLASS 210 / 626
.~.~.~.~.~ To mainstream oxygenation (e.g., activated sludge, etc.)

Current as of: June, 1999
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210 /   HD   LIQUID PURIFICATION OR SEPARATION

600  DF  PROCESSES {14}
601  DF  .~ Treatment by living organism {13}
620  DF  .~.~ Aerobic treatment {3}
621  DF  .~.~.~ Recirculating to prior step {2}
623  DF  .~.~.~.~ Of sludge or separated solid {3}
626.~.~.~.~.~ To mainstream oxygenation (e.g., activated sludge, etc.) {2}
627  DF  .~.~.~.~.~.~> Utilizing specific oxidant, other than air alone (e.g., oxygen-enriched air, ozone, peroxide, etc.)
628  DF  .~.~.~.~.~.~> Utilizing mechanical aeration means

DEFINITION

Classification: 210/626

To mainstream oxygenation (e.g., activated sludge, etc.):

(under subclass 623) Process in which the prior step comprises treatment with oxygen.