Re: GAS-L: MSW and Biosolids

[Harmon Seaver <hseaver@cybershamanix.com>]

   In my case, I'm not the municipality, I'm just interested in getting the dried biosolids that they are
hauling out to the farmers and paying them to take, and then gasfiying it to make electricity. I'm not
sure that it hasn't already been digested -- I know that they are flaring off methane all the time at the
treatment plant. At any rate, given that you have a totally dry product, at least in the instance that I
was told about, would it be very efficient to digest it (which would require adding water), then drying it
again to gasifiy or burn, or just gasifiying it in the first place. Not to mention a much greater capital
expense to build both digester and gasifier. 
   I definitely wouldn't want to have a lot of stuff left over to landfill -- at my cost, especially. 


On Mon, Apr 01, 2002 at 08:08:17PM -0400, Kevin Chisholm wrote:
> Dear Neal
> 
> OK.... what about "digesting the dirties", to produce biogas for high grade energy production, i.e., electricity, and then use the waste heat from the engine system, and the waste heat from residue incineration to serve the district heating needs?
> 
> Kevin Chisholm
>   ----- Original Message ----- 
>   From: CAVM@aol.com 
>   To: gasification@crest.org 
>   Sent: Monday, April 01, 2002 5:02 PM
>   Subject: GAS-L: MSW and Biosolids
> 
> 
>   As far as I know, MSW is unsorted municipal garbage.  It can be sent through a MRF, material recovery facility, at great expense to sort out recyclables and unsuitable materials.  There is some talk of gasifing the sorted MSW after a MRF but not much of trying it with unsorted MSW.  We have been talking to Phil Moss of Kentucky about an MSW gasifier he has had running for some time in Alaska.  Phil can be reached at    pamoss@kih.net
> 
>   Biosolids (sewer sludge) can be digested as Kevin says.  For my part, I would prefer to combust them and extract all of the energy value.  For a district heating system using steam the biosolids could be a good fuel, depends on the combustion technology and the metal content of the biosolids.  But this is a very doable project for any interested municipality. Same is true for feed lot, dairy and hog manure.
> 
> 

-- 
Harmon Seaver	
CyberShamanix
http://www.cybershamanix.com

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