[Stoves] rice husk ash, rice husk biochar, cristobalite

[revjcsd at juno.com]

Rebecca,

At the end of this email, I have cut-and-pasted portions of a conversation sometime last June, between and among Paul Olivier, Tom Miles, et al.
 
I appreciate your word of caution. I too have concern re: cristobalite formation risk.

I don't know if only I seem to see the distinction Paul Olivier makes between combustion and gasification of rice husk. I don't know either if it is a fact that combustion does but gasification does not cause cristobalite to form.

I'm looking for answers.

+++++++++++


1.
 
Fr. Juanito  --  I found it!!  Read Paul Olivier’s email below to Tom.  The 2009 report I mentioned in an earlier emil  is from IPS --
 
http://www.ipsnews.net/2009/10/thailand-renewable-energy-not-so-clean-and-green-after-all/
 
Rebecca
 
2.
On Sat, Jun 15, 2013 at 5:20 PM, Paul Olivier <paul.olivier at esrla.com> wrote:
Tom,

I found this news report:
     http://www.ipsnews.net/2009/10/thailand-renewable-energy-not-so-clean-and-green-after-all/

Not such a nice story.

I do not think it's a good idea to burn rice hulls or rice straw in either power plants, brick kilns or household stoves.

3.
On Sat, Jun 15, 2013 at 11:18 AM, Tom Miles <tmiles at trmiles.com> wrote:
Paul,
 
After discussing rice hull combustion and gasification at some length you are now saying this is dangerous. Why, specifically? You have discussed the potential to emit cristobalite but there is no evidence of the hazard it presents. What evidence do you have that burning rice husks or rice straw is a health hazard?


4.
From: Paul Olivier
Sent: Wednesday, June 12, 2013 12:01 AM

Also many of the positive characteristics of biochar are lost when biochar is combusted and is reduced to ash. The combustion of biomass and biochar takes place when channeling occurs, and the combustion of biochar takes place if the fan is not turned off at the end of the process. Rice hull ash and rice hill biochar are not at all the same thing when it comes to growing plants. Also rice hull ash can easily contain cristobalite, which is a nasty carcinogen. Under ordinary conditions, no farmer should be handling this stuff.
 




Please note: message attached

From: "Rebecca A. Vermeer" <ravermeer at telus.net>
To: <revjcsd at juno.com>
Cc: "Rebecca A. Vermeer" <ravermeer at telus.net>
Subject: Fw: [Stoves] Chimneys, rice husks [Ovens]
Date: Tue, 25 Feb 2014 22:17:00 -0800


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