DIG-L: digester accidents

[Marty Climenhaga <mclimenhaga@macviro.com>]

Hello all,

I am trying to get some info on AD accidents - most references I see talk 
about the possibility of explosion, but I haven't heard of specific 
instances and I'm trying to get a handle on whether they are rare, 
extremely rare, never happen or happen more often than you'd think but 
aren't widely publicized.

I am wondering who has heard of an explosion, fire or other accident 
involving an anaerobic digester in any application, whether industrial, 
wastewater, farm, or low-tech biodigesters in developing countries.  Can 
anyone point me to somewhere to look?

-----Original Message-----
From:	renertech [SMTP:renertech@xtra.co.nz]
Sent:	Monday, April 08, 2002 7:13 AM
To:	digestion@crest.org
Subject:	Fw: DIG-L: energy conversion

Oops!   Forgot to add the attachment.  So Sorry.  I also added in a few 
more comments to the message below.  Ken C.
----- Original Message -----
From: renertech
To: digestion@crest.org
Sent: Monday, April 08, 2002 10:48 PM
Subject: Re: DIG-L: energy conversion


Dear Michael, I had replied to a couple of other requests off line, but it 
looks as if the New Zealand Farmer biogas system is interesting to many 
more, so I am replying to you on the network.  Because the first guy as 
from the US of A, I did the figures in Imperial rather than metric.  If you 
can't decipher them then I guess I could do a rerun??    Because of the low 
prices for petroleum fuels over the last 15 years, there are not too many 
plants still working, but those that are will be watching the present OPEC 
price hikes with great interest.  Most of these farmers take the 
intermediate pressure methane of stripped biogas and  use a long stroke 
hydraulic cylinder to compress it up to 3000psi in one compression stroke. 
 Then they have the usual  CNG conversion kit on their motor vehicles and 
run around on their own homemade CNG.  I might also say that  using the 
UASB technique, you don't need to use up half of your gas to heat the 
system to mesophyllic temperatures.  Biogas can be made at temperatures as 
low as 10-15oC   If you look at the publications page on my website,  you 
will see a report there on making biogas from coffee wastes which gives 
most of the details.
Sincerely,
Ken Calvert.
Renertech.
159 St.Andrew St.
Invercargill.
New Zealand. 9501
Phone. +64 3217 7015
Fax.      +64 3217 7032
E-Mail   renertech@xtra.co.nz
Webs   www.coffee.20m.com
----- Original Message -----
  From: Michael Kottner
  To: renertech
  Sent: Monday, April 08, 2002 8:17 PM
  Subject: Re: DIG-L: energy conversion


  Dear Ken,

  I would be more interested in your system of gas stripping, especially to 
take out the CO2 under low pressure. How is it done and is it still done in 
New Zealand as in Germany we are looking always at very complicated devices 
when it comes to CO2 stripping ? Could you send some more information, 
bacause farmers here are interested in low tech approaches.

 << File: ATT00009.html >>  << Message: Re: biogas stripping etc. >>  << 
File: ATT00011.txt >> 

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