US PATENT SUBCLASS 210 / 624
.~.~.~.~.~ And returning to or withdrawing from diverse treating zones

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}
624.~.~.~.~.~ And returning to or withdrawing from diverse treating zones

DEFINITION

Classification: 210/624

And returning to or withdrawing from diverse treating zones:

(under subclass 623) Process including plural steps of sediment recirculation from or to different treating areas.