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</o:shapelayout></xml><![endif]--></head><body bgcolor=white lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>Now that’s interesting. Then what to do with the wash water . . <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>Thanks<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>Tom<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>. <o:p></o:p></span></p><p class=MsoNormal><a name="_MailEndCompose"></a><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'>From:</span></b><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> biochar@yahoogroups.com [mailto:biochar@yahoogroups.com] <br><b>Sent:</b> Saturday, January 16, 2016 7:59 PM<br><b>To:</b> 'Discussion of biomass pyrolysis and gasification' <gasification@lists.bioenergylists.org>; biochar@yahoogroups.com<br><b>Subject:</b> [biochar] RE: [Gasification] Characterization of waste water from biomass gasification equipment: A case-study from Cambodia<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal> <o:p></o:p></p><div id=ygrp-mlmsg><div id=ygrp-msg><div id=ygrp-text><p style='margin-bottom:12.0pt'>The latest "Nature" has a paper from Cornell (describing the efficiency<br>(great!) of removing organic micropollutants with a B-cyclodextrin sorbent,<br>a glucose derivative. It is also effective at regenerating the functionality<br>of activated carbon, employing only a simple wash.<br><br>This could be a keystone technology that could be synergistic with practical<br>gasification.<br><br>Hope!<br>Mark<br><br>(Rapid removal of organic micropollutants from water with a porous<br>B-cyclodextrin polymer. doi:10.1038/nature 16185. Albaiee, Smith, Xiao, Ling<br>et al.)<br><br>-----Original Message-----<br>From: Gasification [<a href="mailto:gasification-bounces@lists.bioenergylists.org">mailto:gasification-bounces@lists.bioenergylists.org</a>] On<br>Behalf Of Tom Miles<br>Sent: Saturday, January 16, 2016 3:14 PM<br>To: 'Discussion of biomass pyrolysis and gasification'<br><<a href="mailto:gasification@lists.bioenergylists.org">gasification@lists.bioenergylists.org</a>>; <a href="mailto:biochar@yahoogroups.com">biochar@yahoogroups.com</a><br>Subject: Re: [Gasification] Characterization of waste water from biomass<br>gasification equipment: A case-study from Cambodia<br><br>James,<br><br>Thanks for these comments. Researchers in Japan have found that a vegetable<br>oil scrubber using rice husk char as a media has very good tar removal for<br>gasifiers which illustrates some of the points that you make. <br><br>Tom <br><br>-----Original Message-----<br>From: Gasification [<a href="mailto:gasification-bounces@lists.bioenergylists.org">mailto:gasification-bounces@lists.bioenergylists.org</a>] On<br>Behalf Of James Joyce<br>Sent: Saturday, January 16, 2016 2:29 PM<br>To: <a href="mailto:gasification@lists.bioenergylists.org">gasification@lists.bioenergylists.org</a><br>Subject: Re: [Gasification] Characterization of waste water from biomass<br>gasification equipment: A case-study from Cambodia<br><br>Hi Tom, I might make a few comments and caution people not to discard the<br>char filtering option based on a couple of negative experiences. It may not<br>so much be the case that char filtering does not work ... just that it does<br>not work the way it has been tried.<br><br>- Not all biochars are the same and neither are all activated carbons. Most<br>activated carbons are highly microporous, which is not very useful for<br>liquid phase adsorption. If you did not use one known to be highly<br>mesoporous (like a wood char rather than nut char) then it is worth<br>revisiting.<br><br>- Dry chars tend to be hydrophobic. That makes them useless for liquid phase<br>adsorption until they have had a chance to condition and be able to "wet"<br>through into the pores. If the pores are full of air that needs to be<br>displaced before you can adsorb anything else. In my experience mixing time,<br>elevated temperature and perhaps acidity? can facilitate the wetting<br>process. Packed bed filters don't allow for much in the way of mixing time.<br><br>- Particle size will play an important role, as it interacts with the<br>surface tension of suspended matter. If a packed bed filter did not work<br>then I would try mixing fine char with the water in a mixing tank (possibly<br>at elevated temperature) before filtering that mixture through a packed bed<br>char filter.<br><br>- Aged tarry water may well be a different beast to fresh tarry water.<br><br>One other idea: <br>In coal processing interface change agents such as diesel and MIBC are<br>commonly used to alter the surface interaction between fine coal and air<br>bubbles for the purposes of floating out the diesel and fine coal. See<br><a href="https://en.wikipedia.org/wiki/Froth_flotation">https://en.wikipedia.org/wiki/Froth_flotation</a> . A similar process might work<br>for the hydrophobic fraction of the tarry water. The remaining soluble and<br>hydrophilic fractions are probably more biodegradeable.<br><br>Froth flotation is also used in sugar refineries and is very effective at<br>removing very finely dispersed colloidal matter from solutions of soluble<br>matter.<br><br>In either process the key is to introduce fine solids that the colloidal<br>matter and air bubbles can attach to.<br><br>Regards,<br><br>James<br><br>------------------------------<br><br>Date: Sat, 16 Jan 2016 11:41:12 -0500<br>From: <a href="mailto:linvent@aol.com">linvent@aol.com</a><br>To: <a href="mailto:gasification@lists.bioenergylists.org">gasification@lists.bioenergylists.org</a>, <a href="mailto:spaco@baldwin-telecom.net">spaco@baldwin-telecom.net</a><br>Cc: <a href="mailto:gasifiers@bioenergylists.org">gasifiers@bioenergylists.org</a>, <a href="mailto:biochar@yahoogroups.com">biochar@yahoogroups.com</a><br>Subject: Re: [Gasification] Characterization of waste water from<br>biomass gasification equipment: A case-study from Cambodia<br>Message-ID: <<a href="mailto:8D31E93D7DA4606-1F38-3863F9@webmail-vm013.sysops.aol.com">8D31E93D7DA4606-1F38-3863F9@webmail-vm013.sysops.aol.com</a>><br>Content-Type: text/plain; charset="us-ascii"<br><br>I have tried commercial activated charcoal and it doesn't work. It is far<br>superior to bio char in adsorptivity, and the tarry water passes through it<br>without removal.?<br>Sincerely,<br>Leland T. "Tom" Taylor<br>Thermogenics Inc.?<br><br>_______________________________________________<br>Gasification mailing list<br><br>to Send a Message to the list, use the email address<br><a href="mailto:Gasification@bioenergylists.org">Gasification@bioenergylists.org</a><br><br>to UNSUBSCRIBE or Change your List Settings use the web page<br><a href="http://lists.bioenergylists.org/mailman/listinfo/gasification_lists.bioenerg">http://lists.bioenergylists.org/mailman/listinfo/gasification_lists.bioenerg</a><br>ylists.org<br><br>for more Gasifiers, News and Information see our web site:<br><a href="http://gasifiers.bioenergylists.org/">http://gasifiers.bioenergylists.org/</a><br><br>_______________________________________________<br>Gasification mailing list<br><br>to Send a Message to the list, use the email address<br><a href="mailto:Gasification@bioenergylists.org">Gasification@bioenergylists.org</a><br><br>to UNSUBSCRIBE or Change your List Settings use the web page<br><a href="http://lists.bioenergylists.org/mailman/listinfo/gasification_lists.bioenerg">http://lists.bioenergylists.org/mailman/listinfo/gasification_lists.bioenerg</a><br>ylists.org<br><br>for more Gasifiers, News and Information see our web site:<br><a href="http://gasifiers.bioenergylists.org/">http://gasifiers.bioenergylists.org/</a><o:p></o:p></p></div><div><p class=MsoNormal><span style='color:white'>__._,_.___<o:p></o:p></span></p></div><div style='margin-top:7.5pt' id=fromDMARC><div class=MsoNormal align=center style='text-align:center'><hr size=3 width="100%" noshade style='color:#E3E3E3' align=center></div><p class=MsoNormal>Posted by: "Mark Elliott Ludlow" <<a href="mailto:mark@ludlow.com">mark@ludlow.com</a>> <o:p></o:p></p><div class=MsoNormal align=center style='text-align:center'><hr size=3 width="100%" noshade style='color:#E3E3E3' align=center></div></div><table class=MsoNormalTable border=0 cellspacing=3 cellpadding=0><tr><td style='padding:5.25pt 3.75pt 3.75pt 3.75pt'><p 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