[Digestion] AD for cow manure

[Rex Zietsman]

Bill,

This businesses are dairy farms. So they use power mainly for refrigeration
to cool the milk and to pump water for irrigating their lands. There is not
a hell of a lot one can do to reduce this consumption short of changing the
technology completely. This would be ok for a new build but financially
daunting for an existing set up. Instead, what we are looking at is to
utilize a waste stream to reduce the dependence on power produced from coal.
That is already a significant improvement over not doing anything at all.
The power can easily be pumped into the existing infrastructure and is the
least cost route both from a financial and a carbon footprint point of view.

Thanks for your viewpoint though. The CO2 can be used to help grow duck weed
(as per Theo Bijman's company's approach) that can go back into the AD to
improve the quality of the gas (higher methane to CO2 ratio) while
recovering more gas and reducing the CO2 emission even more!

All the best
Rex