US PATENT SUBCLASS 210 / 623
.~.~.~.~ Of sludge or separated solid

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.~.~.~.~ Of sludge or separated solid {3}
624  DF  .~.~.~.~.~> And returning to or withdrawing from diverse treating zones
625  DF  .~.~.~.~.~> Treating outside mainstream
626  DF  .~.~.~.~.~> To mainstream oxygenation (e.g., activated sludge, etc.) {2}

DEFINITION

Classification: 210/623

Of sludge or separated solid:

(under subclass 621) Process wherein sediment is recirculated.

(1) Note. Sludge includes solids separated by various methods and which retain considereable liquid, having a muddy or gelatinous texture.

SEE OR SEARCH THIS CLASS, SUBCLASS:

713, for a precipitation process including recirculation of separated solids.