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<DIV><FONT face=Arial><FONT size=4 face="Times New Roman">Kyle, so many
questions.</FONT></FONT></DIV>
<DIV><FONT face=Arial><FONT size=4
face="Times New Roman"> </FONT></FONT></DIV>
<DIV><FONT face=Arial><FONT size=4 face="Times New Roman">I will attempt to
answer all your enqueries in order as follows;</FONT></FONT></DIV>
<DIV><FONT size=4> </FONT></DIV>
<DIV><FONT face=Arial><FONT size=4 face="Times New Roman">Peter, how much power
did your system require for pumping? </FONT></FONT></DIV>
<DIV><FONT face=Arial><FONT size=4 face="Times New Roman">Minimal,. the 500W
pump ran for one minute in fifteen for the period when heat was available. The
pump was more powerful than required, but it was one I had available and was
valved to deliver at a reduced rate so that stored heat would be introduced onto
the external digester wall and displace thermally depleted
water. Worked very well.</FONT></FONT></DIV>
<DIV><FONT size=4></FONT> </DIV>
<DIV><FONT face=Arial><FONT size=4 face="Times New Roman">Is there a way to do
away with the pump? </FONT></FONT></DIV>
<DIV><FONT face=Arial><FONT size=4 face="Times New Roman">No, because the heat
exchanger was a coil configured irrigation tube.You could avoid the pump,
but the heat exchange system would need a complete redesign.</FONT></FONT></DIV>
<DIV><FONT size=4></FONT> </DIV>
<DIV><FONT face=Arial><FONT size=4 face="Times New Roman">How much did a cloudy
day affect the heating system? </FONT></FONT></DIV>
<DIV><FONT face=Arial><FONT size=4 face="Times New Roman">Somewhat, temperature
would drop by 1 degree overnight or cloudy day, a warm day would add 2 degrees
to the digestion.</FONT></FONT></DIV>
<DIV><FONT size=4></FONT> </DIV>
<DIV><FONT face=Arial><FONT size=4 face="Times New Roman">How much power was
required to run your control system (if any)? </FONT></FONT></DIV>
<DIV><FONT face=Arial><FONT size=4 face="Times New Roman">Minimal. 750W for one
minute per hour was sufficient to disturb stratification, prevent settling and
maintain a homogenious slurry. Controlling was done by an electronic
timer.</FONT></FONT></DIV>
<DIV><FONT face=Arial><FONT size=4
face="Times New Roman"></FONT></FONT> </DIV>
<DIV><FONT face=Arial><FONT size=4 face="Times New Roman">It is good to hear
that your mesophilic digester was able to produce better fertilizer than the
ambient temperature digester.
</FONT></FONT></DIV>
<DIV><FONT face=Arial><FONT size=4 face="Times New Roman">I don't think the
retention time determines fertilizer quality. As long as the process is complete
the values of the spent digestate should remain the same. Higher
temperatures increase reactivity and as a result retention times are reduced.
You still end up with the same finished humic, fulvic and colloidal
substances.</FONT></FONT></DIV>
<DIV><FONT size=4></FONT> </DIV>
<DIV><FONT face=Arial><FONT size=4 face="Times New Roman">I have seen a website
for a company in Australia called biobowser. Is that the same
company? </FONT></FONT></DIV>
<DIV><FONT face=Arial><FONT size=4
face="Times New Roman">Yes</FONT></FONT></DIV>
<DIV><FONT size=4></FONT> </DIV>
<DIV><FONT face=Arial><FONT size=4 face="Times New Roman">It looks like a
beautiful technology all packaged into one easy (?) to install modular
unit. </FONT></FONT></DIV>
<DIV><FONT face=Arial><FONT size=4 face="Times New Roman">Thank you, it was
designed to be simple to install, operate and service as well as being
globally transportable to any location serviced by container-carrying
trucks..</FONT></FONT></DIV>
<DIV><FONT size=4></FONT> </DIV>
<DIV><FONT face=Arial><FONT size=4 face="Times New Roman">Is there a reason why
their smallest unit is for 100kg per day?
</FONT></FONT></DIV>
<DIV><FONT face=Arial><FONT size=4 face="Times New Roman">To cater for very
small volumes of waste, I guess. It does not require exactly 100Kg, it could be
a bit less, it could be a bit more.</FONT></FONT></DIV>
<DIV><FONT face=Arial><FONT size=4
face="Times New Roman"></FONT></FONT> </DIV>
<DIV><FONT face=Arial><FONT size=4 face="Times New Roman">Could their system be
scaled down? </FONT></FONT></DIV>
<DIV><FONT face=Arial><FONT size=4 face="Times New Roman">Sure it could, just as
it has been scaled up but why bother. The 1000L prototype required about 25-40L
of waste per day for continuous feeding. How small would you want to go,
anyway?. If you are chasing gas, you would need at least one cubic meter per day
of methane to make the exercise worthwhile. One cubic meter would be
sufficient to boil water for about an hour. The 1000L bio-reactor produced 2
cubic meters of better than 90% methane per day when
peaking.</FONT></FONT></DIV>
<DIV><FONT size=4></FONT> </DIV>
<DIV><FONT face=Arial><FONT size=4 face="Times New Roman">Best
Regards,</FONT></FONT></DIV>
<DIV><FONT face=Arial><FONT size=4><FONT
face="Times New Roman">Peter.</FONT><BR><BR></FONT></DIV></FONT></BODY></HTML>