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

[Josh Kearns]

Ha!

We're just starting up some batch tests to quantify uptake of N, P, and K
from urine.......

I'll make sure the results of these studies are accessible to the list.

Josh


On Thu, Nov 8, 2012 at 6:03 PM, Paul Olivier <paul.olivier at esrla.com> wrote:

> 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
>>>
>>>
>>> ****
>>>
>>> ** **
>>>
>>> ** **
>>>
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>>
>>
>> --
>> 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
>>
>>
>>
>>
>>
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>
>
> --
> Paul A. Olivier PhD
> 27C Pham Hong Thai Street
> Dalat
> Vietnam
>
> Louisiana telephone: 1-337-447-4124 (rings Vietnam)
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-- 
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
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