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

Thu Nov 8 23:51:20 CST 2012

Paul - we will look at N-speciation in our sorption experiments and let you
know. We will most likely also be doing some work with gas phase uptake by
biochars. This work is an offshoot of our grant from the Gates Foundation
("Reinvent The Toilet Challenge"). We should have some interesting and
hopefully insightful results to share and discuss in the coming
weeks/months.

I have some rice husk gasifier char that was sent to me by a Stanford grad
student who was working in Vietnam some months ago - perhaps you met Ivy
Nguyen? I haven't gotten around to testing it yet, but we can most likely
incorporate it into our experimental matrix. I'd love to have a 150
gasifier if you are willing to send me one.

Josh

On Thu, Nov 8, 2012 at 6:28 PM, Paul Olivier <paul.olivier at esrla.com> wrote:

> Josh,
>
> Also I am curious to know which form of N is best sorbed by biochar: urea,
> ammonia, ammonium, nitrate ...
> Does N have to be in a liquid or gaseous state for the best result?
>
> Since rice hulls are so available and cheap here in Asia,
>  I would be delighted if you could run tests on rice hull biochar.
> Would this be possible?
> Can you access rice hulls?
> If so, I will send you a 150 gasifier.
>
> Imagine rice hull biochar loaded with N from human urine fed to cattle to
> improve feed conversion and reduce methane.
> http://www.lrrd.org/lrrd24/11/leng24199.htm
>
> Thanks.
> Paul
>
>
> On Fri, Nov 9, 2012 at 8:11 AM, Josh Kearns <yeah.yeah.right.on at gmail.com>wrote:
>
>> 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)
>>> Mobile: 090-694-1573 (in Vietnam)
>>> Skype address: Xpolivier
>>> http://www.esrla.com/
>>>
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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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>> Stoves mailing list
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>>
>>
>
>
> --
> 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/
>
> _______________________________________________
> Stoves mailing list
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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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