Now that's interesting. Then what to do with the wash water . .
Thanks Tom . From: [email protected] [mailto:[email protected]] Sent: Saturday, January 16, 2016 7:59 PM To: 'Discussion of biomass pyrolysis and gasification' <[email protected]>; [email protected] Subject: [biochar] RE: [Gasification] Characterization of waste water from biomass gasification equipment: A case-study from Cambodia The latest "Nature" has a paper from Cornell (describing the efficiency (great!) of removing organic micropollutants with a B-cyclodextrin sorbent, a glucose derivative. It is also effective at regenerating the functionality of activated carbon, employing only a simple wash. This could be a keystone technology that could be synergistic with practical gasification. Hope! Mark (Rapid removal of organic micropollutants from water with a porous B-cyclodextrin polymer. doi:10.1038/nature 16185. Albaiee, Smith, Xiao, Ling et al.) -----Original Message----- From: Gasification [mailto:[email protected]] On Behalf Of Tom Miles Sent: Saturday, January 16, 2016 3:14 PM To: 'Discussion of biomass pyrolysis and gasification' <[email protected] <mailto:[email protected]> >; [email protected] <mailto:[email protected]> Subject: Re: [Gasification] Characterization of waste water from biomass gasification equipment: A case-study from Cambodia James, Thanks for these comments. Researchers in Japan have found that a vegetable oil scrubber using rice husk char as a media has very good tar removal for gasifiers which illustrates some of the points that you make. Tom -----Original Message----- From: Gasification [mailto:[email protected]] On Behalf Of James Joyce Sent: Saturday, January 16, 2016 2:29 PM To: [email protected] <mailto:[email protected]> Subject: Re: [Gasification] Characterization of waste water from biomass gasification equipment: A case-study from Cambodia Hi Tom, I might make a few comments and caution people not to discard the char filtering option based on a couple of negative experiences. It may not so much be the case that char filtering does not work ... just that it does not work the way it has been tried. - Not all biochars are the same and neither are all activated carbons. Most activated carbons are highly microporous, which is not very useful for liquid phase adsorption. If you did not use one known to be highly mesoporous (like a wood char rather than nut char) then it is worth revisiting. - Dry chars tend to be hydrophobic. That makes them useless for liquid phase adsorption until they have had a chance to condition and be able to "wet" through into the pores. If the pores are full of air that needs to be displaced before you can adsorb anything else. In my experience mixing time, elevated temperature and perhaps acidity? can facilitate the wetting process. Packed bed filters don't allow for much in the way of mixing time. - Particle size will play an important role, as it interacts with the surface tension of suspended matter. If a packed bed filter did not work then I would try mixing fine char with the water in a mixing tank (possibly at elevated temperature) before filtering that mixture through a packed bed char filter. - Aged tarry water may well be a different beast to fresh tarry water. One other idea: In coal processing interface change agents such as diesel and MIBC are commonly used to alter the surface interaction between fine coal and air bubbles for the purposes of floating out the diesel and fine coal. See https://en.wikipedia.org/wiki/Froth_flotation . A similar process might work for the hydrophobic fraction of the tarry water. The remaining soluble and hydrophilic fractions are probably more biodegradeable. Froth flotation is also used in sugar refineries and is very effective at removing very finely dispersed colloidal matter from solutions of soluble matter. In either process the key is to introduce fine solids that the colloidal matter and air bubbles can attach to. Regards, James ------------------------------ Date: Sat, 16 Jan 2016 11:41:12 -0500 From: [email protected] <mailto:[email protected]> To: [email protected] <mailto:[email protected]> , [email protected] <mailto:[email protected]> Cc: [email protected] <mailto:[email protected]> , [email protected] <mailto:[email protected]> Subject: Re: [Gasification] Characterization of waste water from biomass gasification equipment: A case-study from Cambodia Message-ID: <[email protected] <mailto:[email protected]> > Content-Type: text/plain; charset="us-ascii" I have tried commercial activated charcoal and it doesn't work. It is far superior to bio char in adsorptivity, and the tarry water passes through it without removal.? Sincerely, Leland T. "Tom" Taylor Thermogenics Inc.? _______________________________________________ Gasification mailing list to Send a Message to the list, use the email address [email protected] <mailto:[email protected]> to UNSUBSCRIBE or Change your List Settings use the web page http://lists.bioenergylists.org/mailman/listinfo/gasification_lists.bioenerg ylists.org for more Gasifiers, News and Information see our web site: http://gasifiers.bioenergylists.org/ _______________________________________________ Gasification mailing list to Send a Message to the list, use the email address [email protected] <mailto:[email protected]> to UNSUBSCRIBE or Change your List Settings use the web page http://lists.bioenergylists.org/mailman/listinfo/gasification_lists.bioenerg ylists.org for more Gasifiers, News and Information see our web site: http://gasifiers.bioenergylists.org/ __._,_.___ _____ Posted by: "Mark Elliott Ludlow" <[email protected] <mailto:[email protected]> > _____ <https://groups.yahoo.com/neo/groups/biochar/conversations/messages/18899;_y lc=X3oDMTJybDByZzR2BF9TAzk3MzU5NzE0BGdycElkAzIyNDM4MDUyBGdycHNwSWQDMTcwNzQxO DYxMgRtc2dJZAMxODg5OQRzZWMDZnRyBHNsawNycGx5BHN0aW1lAzE0NTMwMDMxMjQ-?act=repl y&messageNum=18899> Reply via web post . <mailto:[email protected]?subject=RE%3A%20%5BGasification%5D%20Characterizatio n%20of%20waste%20water%20from%20biomass%20gasification%20equipment%3A%20A%20 case-study%20from%20Cambodia> Reply to sender . <mailto:[email protected]?subject=RE%3A%20%5BGasification%5D%20Charact erization%20of%20waste%20water%20from%20biomass%20gasification%20equipment%3 A%20A%20case-study%20from%20Cambodia> Reply to group . <https://groups.yahoo.com/neo/groups/biochar/conversations/newtopic;_ylc=X3o DMTJmaG5wam5rBF9TAzk3MzU5NzE0BGdycElkAzIyNDM4MDUyBGdycHNwSWQDMTcwNzQxODYxMgR zZWMDZnRyBHNsawNudHBjBHN0aW1lAzE0NTMwMDMxMjQ-> Start a New Topic . <https://groups.yahoo.com/neo/groups/biochar/conversations/topics/18897;_ylc =X3oDMTM3N29hcXVzBF9TAzk3MzU5NzE0BGdycElkAzIyNDM4MDUyBGdycHNwSWQDMTcwNzQxODY xMgRtc2dJZAMxODg5OQRzZWMDZnRyBHNsawN2dHBjBHN0aW1lAzE0NTMwMDMxMjQEdHBjSWQDMTg 4OTc-> Messages in this topic (3) <https://groups.yahoo.com/neo/groups/biochar/info;_ylc=X3oDMTJma3U1bDJ0BF9TA zk3MzU5NzE0BGdycElkAzIyNDM4MDUyBGdycHNwSWQDMTcwNzQxODYxMgRzZWMDdnRsBHNsawN2Z 2hwBHN0aW1lAzE0NTMwMDMxMjQ-> Visit Your Group * <https://groups.yahoo.com/neo/groups/biochar/members/all;_ylc=X3oDMTJnOWswbH ZyBF9TAzk3MzU5NzE0BGdycElkAzIyNDM4MDUyBGdycHNwSWQDMTcwNzQxODYxMgRzZWMDdnRsBH NsawN2bWJycwRzdGltZQMxNDUzMDAzMTI0> New Members 1 <https://groups.yahoo.com/neo;_ylc=X3oDMTJlYTVkMmhxBF9TAzk3MzU5NzE0BGdycElkA zIyNDM4MDUyBGdycHNwSWQDMTcwNzQxODYxMgRzZWMDZnRyBHNsawNnZnAEc3RpbWUDMTQ1MzAwM zEyNA--> . <https://info.yahoo.com/privacy/us/yahoo/groups/details.html> Privacy . <mailto:[email protected]?subject=Unsubscribe> Unsubscribe . <https://info.yahoo.com/legal/us/yahoo/utos/terms/> Terms of Use . <http://geo.yahoo.com/serv?s=97359714/grpId=22438052/grpspId=1707418612/msgI d=18899/stime=1453003124> <http://y.analytics.yahoo.com/fpc.pl?ywarid=515FB27823A7407E&a=1000131032227 9&js=no&resp=img> __,_._,___
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