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 <[email protected]>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 < > [email protected]> 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 >> [email protected] >> >> 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 > [email protected] > > 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/
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