Design and Testing of a Pilot-Scale Aqueous Ammonia Soaking Biomass Pretreatment System

dc.contributor.author Himmelsbach, Jennifer
dc.contributor.author Isci, Asli
dc.contributor.author Raman, D. Raj
dc.contributor.author Raman, D. Raj
dc.contributor.author Anex, Robert
dc.contributor.department Agricultural and Biosystems Engineering
dc.date 2018-02-13T03:43:56.000
dc.date.accessioned 2020-06-29T22:41:01Z
dc.date.available 2020-06-29T22:41:01Z
dc.date.copyright Thu Jan 01 00:00:00 UTC 2009
dc.date.embargo 2012-12-07
dc.date.issued 2009-01-01
dc.description.abstract <p>Scale-up of the aqueous ammonia soaking (AAS) biomass pretreatment method to 75-L soaking vessel size was accomplished in this work. A novel, pilot-scale AAS system capable of pretreating 4 kg of switchgrass per cycle was designed, fabricated, and tested. The pretreatment process involved soaking biomass in 29.5% aqueous ammonium hydroxide at a liquid: solid ratio of 5 L/kg. Major vessel design criteria included (1) allowing thorough washing of the soaked biomass in the pretreatment reactor; (2) simple, low-cost fabrication; and (3) limiting safety hazards by minimizing ammonia fumes from the system. Based on these constraints, commercially available 75-L HDPE tanks were selected as the primary vessels for pretreatment. The pretreatments were conducted outside, without agitation during the summer months in Iowa, with ambient temperatures ranging from 15°C to 33°C. During the first experimental cycle, clogging of the outlet resulted in leakage from the vessel during rinsing, and led to redesign of the washout prevention system. The redesigned system used a "teabag" approach in which dry biomass was preloaded into a cylindrical mesh bag, and the filled bag was placed into the soaking vessel. This modification eliminated outlet clogging, simplified biomass loading and unloading, but slightly reduced washing efficiency. Through five soaking cycles, an average of 22% to 25% delignification was achieved (Klason lignin basis) compared to the 35% removal seen at the bench-scale as reported by our group. Approximately 50% to 60% of the pretreated switchgrass was recovered, dry basis, compared to 75% previously achieved at the bench-scale. Overall, the system successfully generated moderate quantities (10 kg/wk) of pretreated biomass for pilot-scale fermentation experiments while illustrating some of the materials handling challenges that must be addressed as pretreatment methods are scaled-up.</p>
dc.description.comments <p>This article is from <a href="http://elibrary.asabe.org/abstract.asp?aid=29224&t=3&dabs=Y&redir=&redirType=" target="_blank"><em>Applied Engineering in Agriculture</em></a>, 25, no. 6 (2009): 953–959.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/abe_eng_pubs/58/
dc.identifier.articleid 1054
dc.identifier.contextkey 3522279
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath abe_eng_pubs/58
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/1361
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/abe_eng_pubs/58/Raman_2009_DesignTestingPilotScale.pdf|||Sat Jan 15 01:00:38 UTC 2022
dc.source.uri 10.13031/2013.29224
dc.subject.disciplines Agriculture
dc.subject.disciplines Bioresource and Agricultural Engineering
dc.subject.keywords Bioenergy
dc.subject.keywords Pilot-scale
dc.subject.keywords Pretreatment
dc.subject.keywords Aqueous ammonia soaking
dc.subject.keywords Switchgrass
dc.title Design and Testing of a Pilot-Scale Aqueous Ammonia Soaking Biomass Pretreatment System
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isAuthorOfPublication 0d20027b-c384-4033-aafe-d7cf62e10240
relation.isOrgUnitOfPublication 8eb24241-0d92-4baf-ae75-08f716d30801
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