Re: DIG-L: Controling pathogens?

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

In the U.S. there is some requirement for this type of pastuerisation, but I
don't think anyone has done it with a pipe...more with a heated tank.  It
seems like a good idea but I don't know the retention times required.
----- Original Message -----
From: Lowell Prag <aj574@detroit.freenet.org>
To: <digestion@crest.org>
Sent: Tuesday, February 22, 2000 1:29 PM
Subject: DIG-L: Controling pathogens?


>
>
> ae198@dial.pipex.com ("Les. Gornall") said:
>
> ---snip---
>
> This may be a simplistic question but...
>
> in the control of harmful pathogens remaining in either in a mesophilic or
> thermophilic digester, why not then run the effluent through an insulated
> and heated double jacketed pipeline with heat supplied by the methane
> recovery, to insure a high enough temperature to kill anything harmful?
>
> i.e:
>
> --------------------------------------
> insulation
> -------------------------
> pipe walls with circulating hot water
> -------------------------
>
> effluent                  --> holding tank
>
> -------------------------
> pipe walls with circulating hot water
> -------------------------
> insulation
> ---------------------------------------
>
> The flow rate via the effluent pipe sizing and pumping rate would be
> such as to insure the desired rate of temperature rise in the effluent.
>
> Does this make sense to insure safety in either type of digester?
>
>
> --
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