US PATENT SUBCLASS 210 / 620
.~.~ Aerobic treatment

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.~.~ Aerobic treatment {3}
621  DF  .~.~.~> Recirculating to prior step {2}
629  DF  .~.~.~> And internally circulating the liquid
630  DF  .~.~.~> And anaerobic treatment

DEFINITION

Classification: 210/620

Aerobic treatment:

(under subclass 601) Process wherein the liquid is acted upon by living organisms which thrive on oxygen.

SEE OR SEARCH THIS CLASS, SUBCLASS:

602, for aerobic treatment processes utilizing plants or animals.

604, for aerobic treatment processes wherein the gaseous oxidant employed or generated is collected and reused in the treatment.

606, for aerobic treatment processes by living organisms in conjuction with enzymes.

615, for aerobic treatment processes which utilize a contact surface.