US PATENT SUBCLASS 210 / 622
.~.~.~.~ Of separated liquid

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}
622.~.~.~.~ Of separated liquid

DEFINITION

Classification: 210/622

Of separated liquid:

(under subclass 621) Process and wherein supernatant or filtrate is recirculated.