Appeal No. 95-5000 Page 6
Application No. 08/021,883
a basin containing the sewage. Bailey prefers (col. 3, lines
34-40) that the gas is injected into both chambers at a
position between 0.1 and 0.4 times their total length below
the level of sewage in the basin.2
Bearden discloses a system and method for efficiently
providing aeration of water in a ponding area such as a sewage
ponding tank to maintain the oxygen content of the water at a
level sufficient to satisfy the biological and chemical oxygen
demand (BOD and COD). As shown in Figure 1, the ponding area
is
provided with an open-ended elongated tube 10 vertically
positioned with its lower end above a gas bubble generator 15-
18 so that gas bubbles are entrained in the liquid and carry
the liquid and bubbles up through the tube. A plurality of
orifices 19 are provided in the tube walls to draw in liquid
from the side portions of the tube at a point above the lower
end of the tube to increase the efficiency of the aeration.
2Accordingly, gas is injected into the riser at least 4
meters below the basin when the riser and downcomer extend 40
meters below the basin.
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Last modified: November 3, 2007