[Digestion] Food-waste anaerobic digester at University of Colorado

[Warren Weisman]

Jason,

They have a small-scale food digester at Oregon State
University. They're not too proud of it and I don't
think there's anyone there who knows how to run it,
but it's a good design, with a lid that you would turn
in order to stir the contents. 

Also, a couple of US cities----Oakland for
sure----have large scale food waste digester programs.


Warren Weisman
USA

--- Jason Woods <jdwoods21 at hotmail.com> wrote:

> 
> Hello,
>  
> I'm a mechanical engineering student at the
> University of Colorado in Boulder and I'm currently
> working with a professor and four undergraduate
> students on a feasibility study about using
> anaerobic digestion on campus.  The university
> produces around 1500 tonnes of food waste per year. 
> There will also be some yard waste, but from what
> I've seen, it still seems the waste stream is still
> too small to make the project viable.  Would
> composting make more sense in this instance?
>  
> I was also trying to figure out how much waste water
> will be generated, and it seemed pretty high.  If
> the waste stream is ~70% moisture content and the
> process is run as a "high-solids" digester, and the
> digestate/compost is dried to 50% moisture content,
> my mass balance showed lots and lots of waste water.
>  Am I forgetting something?  Is there very much
> water lost to evaporation?
>  
> Any other advice, suggestions, or comments are
> welcome.
>  
> Thanks much,
> jason woods
>
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