[Stoves] Using TLUD and other chars for water treatment in developing communities:

[Paul Olivier]

Josh,

I really like what you say here.
The big challenge here is in examining the role of biochar in sorbing N
from human urine.
Many thanks.
Paul

On Fri, Nov 9, 2012 at 7:26 AM, Josh Kearns <yeah.yeah.right.on at gmail.com>wrote:

> Hi Crispin (et al.) -
>
> We're just beginning to look at biochars in taste and odor control
> applications. For instance my colleague found that forced draft 1-gal
> "Toucan" TLUD chars are fairly effective for removing chlorine taste. (He
> observed in villages in Peru that people would drink water known to be
> contaminated rather than chlorinated water because of the taste, to which
> they are not desensitized like we are in the US.)
>
> We have an upcoming column study to look at removal of other common T&O
> compounds, mainly MIB I think will turn out to be our focus compound as
> it's difficult to sorb and is detectable by smell/taste as low as 10 ng/L
> (!).
>
> Just hypothesizing at this point, but the trend seems to be that high
> temperature, high-draft TLUD chars perform by far the best in most of our
> applications of interest. Ballpark....about half as good as commercial
> bituminous activated carbon. They also do not leach native organic matter
> into water, which is nice (in contrast to low temperature chars that will
> undergo some initial leaching).
>
> So I woud encourage you to try a good high-draft TLUD char in your boiling
> water - it might make a noticeable difference. Sorption kinetics are sped
> up by elevated temperature, so that may help as well (?). But I have not
> directly experimented with this myself.
>
> Josh
>
>
>
> On Thu, Nov 8, 2012 at 4:56 PM, Crispin Pemberton-Pigott <
> crispinpigott at gmail.com> wrote:
>
>> Dear Josh (is he subscribed?)****
>>
>> ** **
>>
>> Great article. Having gone to Africa in 1977 to build rural water supply
>> systems I appreciate the usefulness of the system you have created. I have
>> on question you might be able to answer.****
>>
>> ** **
>>
>> If I boil water in a container that has some char in it, will it help in
>> any manner? Is it worth putting some into the container?****
>>
>> ** **
>>
>> I was wondering if the processing temperature might have to be above a
>> certain value to get a taste-free result. Ideas? Experiences?****
>>
>> ** **
>>
>> Thanks
>> Crispin****
>>
>> ** **
>>
>> ** **
>>
>> ** **
>>
>> FYI we had an article published last month on using TLUD and other chars
>> for water treatment in developing communities:****
>>
>> ** **
>>
>> http://www.wcponline.com/pdf/October2012Kearns.pdf****
>>
>> ** **
>>
>> feel free to share!****
>>
>> ** **
>>
>> Josh****
>>
>>
>> ****
>>
>> ** **
>>
>> --
>> Josh Kearns
>> PhD Candidate
>> Environmental Engineering
>> Engineering for Developing Communities
>> University of Colorado-Boulder****
>>
>> Director of Science****
>>
>> Aqueous Solutions ****
>>
>> www.aqsolutions.org****
>>
>> ** **
>>
>> Mobile: 720 989 3959
>> Skype: joshkearns
>>
>>
>> ****
>>
>> ** **
>>
>> ** **
>>
>> _______________________________________________
>> Stoves mailing list
>>
>> to Send a Message to the list, use the email address
>> stoves at lists.bioenergylists.org
>>
>> to UNSUBSCRIBE or Change your List Settings use the web page
>>
>> http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org
>>
>> for more Biomass Cooking Stoves,  News and Information see our web site:
>> http://www.bioenergylists.org/
>>
>>
>>
>
>
> --
> Josh Kearns
> PhD Candidate
> Environmental Engineering
> Engineering for Developing Communities
> University of Colorado-Boulder
>
> Director of Science
> Aqueous Solutions
> www.aqsolutions.org
>
> Mobile: 720 989 3959
> Skype: joshkearns
>
>
>
>
>
> _______________________________________________
> Stoves mailing list
>
> to Send a Message to the list, use the email address
> stoves at lists.bioenergylists.org
>
> to UNSUBSCRIBE or Change your List Settings use the web page
>
> http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org
>
> for more Biomass Cooking Stoves,  News and Information see our web site:
> http://www.bioenergylists.org/
>
>
>


-- 
Paul A. Olivier PhD
27C Pham Hong Thai Street
Dalat
Vietnam

Louisiana telephone: 1-337-447-4124 (rings Vietnam)
Mobile: 090-694-1573 (in Vietnam)
Skype address: Xpolivier
http://www.esrla.com/
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.bioenergylists.org/pipermail/stoves_lists.bioenergylists.org/attachments/20121109/a0203d55/attachment.html>