US PATENT SUBCLASS 210 / 630
.~.~.~ And anaerobic 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  DF  .~.~ Aerobic treatment {3}
630.~.~.~ And anaerobic treatment

DEFINITION

Classification: 210/630

And anaerobic treatment:

(under subclass 620) Process wherein additionally the liquid is acted upon by living organisms which thrive in the absence of oxygen.

SEE OR SEARCH THIS CLASS, SUBCLASS:

605, for a liquid being acted upon by living organisms in any of the following sequences:

aerobic - anaerobic - aerobic

(2) anaerobic - aerobic - anaerobic

(3) anaerobic - aerobic