Re: DIG-L: Thermophillic

["Jim Groman" <jgroman@varec.com>]

For further clarification, we have noticed this phenomenem in the mid-western U.S. and Southeastern U.S.  

Best Regards,

Jim
   ----- Original Message ----- 
   From: doelle 
   To: Jim Groman 
   Cc: digestion@crest.org 
   Sent: Friday, February 18, 2000 2:03 AM
   Subject: Re: DIG-L: Thermophillic


   I guess nobody ever tried to stick a thermometer into the 'soup'.
   I find it very hard to believe that such a heating up can be possible unless in the tropics, because it takes a long time to heat up a water mass, depending of course on the size and depth of the lagoon and exposure to sun.
   Intersting thought.
   Best regards
   Horst Doelle
   At 03:19 17/02/00 -0800, you wrote: 
   >>>>

     Just an anecdote, since I am more interested in the consequences (biogas) of digestion than the process tself.\ I believe there are many "un-intentionally" hermophillic digesters in the form of covered anaerobic lagoons. Lagoon systems re used quite extensively in the meat processing industry and many times he project involves converting aerobic lagoons to anaerobic. This sually involves using a "rubber" cover which is invariably black. herefore it absorbs a lot of heat from the sun and the lagoon quickly heats to the thermophillic phase. Since many of these lagoons were previously in service, they tended to hav a substantial fat and grease layer on top. Imagine the surprise of the first designers of these systems when the tarted pumping out 10 times as much gas as they expected! One side note as long as I brought up the ubject...if you have a covered lagoon system, make sure you draw out the biogas with a lower to keep the cover under a slight vacuum. This will prevent the cover from ballooning and getting ripped in the wind. For what its worth, I think lagoons can be an effective low cost system. Jim Groman Inside Sales Manager Vapor Product Manager Varec Vapor Control Inc. 714-229-3230 hone 714-952-2701 Fax 

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   Horst W.Doelle, D.Sc., D.Sc. [h.c.]
   Chairman, IOBB
   Director, MIRCEN-Biotechnology
   FAX: +617-38783230
   Email: doelle@ozemail.com.au