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<DIV><FONT size=2 face=Arial>AD on the whole volume of sewerage is usually not
economically appealing because of the construction costs to build a large AD
plant and the lower yield of biogas per volume of plant capacity. Where I
have seen municipal waste water plants using anaerobic digestion for many years
is on the settled sludge fraction. This has the majority of the nutrients
and occupys a much smaller volume than the sewerage as it comes out of the pipe.
</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>Jim</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
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