[Digestion] Biogas from sewage plants

[Harmon Seaver]

Katahdin Energy Works wrote:
> What do they do with the methane now? Flare it? Or doesn't the system only
> do primary treatment; and landfills the sludge? 
> 
> I'd bet they have some old tanks that are empty that could become sludge
> digesters.
> 
> Another possibility is to invest in pyrolysis refinery to handle sludge,
> toxics, tires, plastics, etc. see www. Pyromex.org.
> 

   Locally they flare the gas, and the sludge is spread on farmfields.
Supposedly the the state of WI is going to outlaw the spreading of
sludge on farms because of the heavy metal problem, but that has yet to
happen. Previously they incinerated the sludge, but that was too costly.

-- 
Harmon Seaver