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</o:shapelayout></xml><![endif]--></head><body bgcolor=white lang=EN-US link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal><span style='color:windowtext'>Biosolds are typically gasified in combination with wood or another bulky biomass. I think the City of Lebanon has incorporated biosolids in their fuel mix of dry urban wood waste. Aries Energy purchased a fluidized bed gasifier developed for biosolids but it is not intended for engine generation. In about 1985 City of Los Angeles ran three bubbling fluidized bed gasifiers on dried digester gas. Heat was recovered in a steam boiler. The project lasted about five years. There have been many small scale experiments using dried biosolids in gasifiers for engines. I am not aware any upgrading the gas. <o:p></o:p></span></p><p class=MsoNormal><span style='color:windowtext'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:windowtext'>A few years go Anaergia Inc ran a Biogreen Energy pyrolyzer in which the dried biosolids from an anaerobic digester were carbonized. The pyrolysis gas was put back into the digester using a process patented by Washington State University. The enriched digester gas was burned in an engine. A project to build a larger system was announced for the City of Los Angeles was not built. <o:p></o:p></span></p><p class=MsoNormal><span style='color:windowtext'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:windowtext'>Tom<o:p></o:p></span></p><p class=MsoNormal><span style='color:windowtext'><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='color:windowtext'>From:</span></b><span style='color:windowtext'> Gasification <gasification-bounces@lists.bioenergylists.org> <b>On Behalf Of </b>Pedros, Philip<br><b>Sent:</b> Saturday, September 22, 2018 1:56 PM<br><b>To:</b> Discussion of biomass pyrolysis and gasification <gasification@lists.bioenergylists.org><br><b>Subject:</b> Re: [Gasification] Question from Philip Pedros<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='color:#1F497D'>Mr. Williams<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>The question was from me and reflects my limited knowledge of gasification, not the company’s. <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>I did not ask about digester gas being used to generate power, nor am I aware of digester gas being referred to as syngas, as your statement implies. Apparently I should have stated that the feed stock to the gasifier was thermally dried biosolids.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>What I asked and what was answered is in point 3 below. I am not aware of syngas from a gasifier, with municipal biosolids as the feedstock, directly fueling a CHP and was asking if it has been done. <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Thank you,<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Philip Pedros<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><div><p class=MsoNormal><span style='color:#1F497D'>Philip B. Pedros, Ph.D., P.E., BCEE<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Technical Lead II<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>AECOM<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>250 Apollo Drive<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Chelmsford, MA 01824<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>C: 781 258-8829<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><a href="mailto:Philip.Pedros@aecom.com"><span style='color:blue'>Philip.Pedros@aecom.com</span></a> <o:p></o:p></span></p></div><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma",sans-serif;color:windowtext'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma",sans-serif;color:windowtext'> Gasification [<a href="mailto:gasification-bounces@lists.bioenergylists.org">mailto:gasification-bounces@lists.bioenergylists.org</a>] <b>On Behalf Of </b>Doug<br><b>Sent:</b> Saturday, September 22, 2018 4:25 PM<br><b>To:</b> <a href="mailto:gasification@lists.bioenergylists.org">gasification@lists.bioenergylists.org</a><br><b>Subject:</b> Re: [Gasification] Question from Philip Pedros<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p>Hi Philip,<o:p></o:p></p><p>Your question is really in several parts:<o:p></o:p></p><p>1. If you are referring to waste water containing sewage sludge, then yes you will have the gas present.<o:p></o:p></p><p>2. Untreated Sewage gas (to clarify which syngas you are talking about) cannot be fed directly into engines without at least a scrubber between the gasometer storage and engine.<o:p></o:p></p><p>3. The gas calorific value of 120-150 Btu/scf is perfectly adequate to run an engine and does not need boosting.<o:p></o:p></p><p>4. The technology you seek is already employed at many City Sewage plants, generating power to run the plant.<o:p></o:p></p><p>5. I suggest you find working installations, there must be quite a few in the USA.<o:p></o:p></p><p>Can I ask you why you or your organization think this is by your question, unknown technology?<o:p></o:p></p><p>Regards,<o:p></o:p></p><p>Doug Williams.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>On 23/09/18 07:49, <a href="mailto:tmiles@trmiles.com">tmiles@trmiles.com</a> wrote:<o:p></o:p></p></div><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><p class=MsoNormal>Can untreated syngas generated from municipal wastewater sludge be used directly to generate power? It is my understanding that the heating value of untreated syngas (120 – 150 But/scf), is too low to feed directly to engines and that some type of post treatment to boost the heating value to 190 -200 is typically economically prohibitive. Any information on such post treatment and an case studies were this has been done would be appreciated.<o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal>Thank you,<o:p></o:p></p><p class=MsoNormal>Philip Pedros<o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal>Philip B. Pedros, Ph.D., P.E., BCEE<o:p></o:p></p><p class=MsoNormal>Technical Lead II<o:p></o:p></p><p class=MsoNormal>AECOM<o:p></o:p></p><p class=MsoNormal>250 Apollo Drive<o:p></o:p></p><p class=MsoNormal>Chelmsford, MA 01824<o:p></o:p></p><p class=MsoNormal>C: 781 258-8829<o:p></o:p></p><p class=MsoNormal><a href="mailto:Philip.Pedros@aecom.com">Philip.Pedros@aecom.com</a><o:p></o:p></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman",serif'><o:p> </o:p></span></p></blockquote><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman",serif'><o:p> </o:p></span></p></div></body></html>