{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/97313"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/97313","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Prairie cordgrass as cellulosic ethanol feedstock and chemical hydrolysis with disk milling for pretreatment","abstract":"Cellulosic ethanol plants have started operating at commercial scale; however, challenges related to feedstock supply and pretreatment efficiency still exist. To provide sufficient feedstock quantity, eleven natural populations of prairie cordgrass (Spartina pectinata L.) harvested in 2011 and 2012 were evaluated as a bioethanol feedstock. After dilute acid pretreatment and simultaneous saccharification and cofermentation (SScF), ethanol yields from prairie cordgrass reached 205 to 276 g/kg biomass and 1,379 to 3,446 kg/ha. These ethanol yields were comparable with those of switchgrass, corn stover and bagasse. To produce feedstocks in a sustainable manner, growing bioethanol feedstocks on marginal lands has been recommended. Ethanol production from prairie cordgrass and switchgrass grown on marginal lands were evaluated by performing dilute acid pretreatment and SScF. Plants grown on marginal lands had ethanol yields comparable to those of plants grown on optimal land. To increase enzyme accessibility to carbohydrates, hot water or dilute acid hydrolysis followed by disk milling was developed as a pretreatment method. Hot water or dilute acid pretreatment and disk milling acted synergistically to improve glucose and xylose yields by 89 and 134%, respectively, compared to hot water pretreatment alone. To take the combined pretreatment process one step closer to commercialization, disk milling was performed with commercially dilute acid pretreated corn stover. Effects of number of disk milling cycles and enzyme dosage on sugar yields were evaluated. Milling was more effective to improve glucose yields (by 70 to 120%), while enzyme dosage was more effective to improve xylose yields (by 37 to 57%). Compared to milling cycles and enzyme dosages, dilute acid pretreatment condition was the most important factor to increase final sugar yields.","abstract_html":"Cellulosic ethanol plants have started operating at commercial scale; however, challenges related to feedstock supply and pretreatment efficiency still exist. To provide sufficient feedstock quantity, eleven natural populations of prairie cordgrass (Spartina pectinata L.) harvested in 2011 and 2012 were evaluated as a bioethanol feedstock. After dilute acid pretreatment and simultaneous saccharification and cofermentation (SScF), ethanol yields from prairie cordgrass reached 205 to 276 g/kg biomass and 1,379 to 3,446 kg/ha. These ethanol yields were comparable with those of switchgrass, corn stover and bagasse. To produce feedstocks in a sustainable manner, growing bioethanol feedstocks on marginal lands has been recommended. Ethanol production from prairie cordgrass and switchgrass grown on marginal lands were evaluated by performing dilute acid pretreatment and SScF. Plants grown on marginal lands had ethanol yields comparable to those of plants grown on optimal land. To increase enzyme accessibility to carbohydrates, hot water or dilute acid hydrolysis followed by disk milling was developed as a pretreatment method. Hot water or dilute acid pretreatment and disk milling acted synergistically to improve glucose and xylose yields by 89 and 134%, respectively, compared to hot water pretreatment alone. To take the combined pretreatment process one step closer to commercialization, disk milling was performed with commercially dilute acid pretreated corn stover. Effects of number of disk milling cycles and enzyme dosage on sugar yields were evaluated. Milling was more effective to improve glucose yields (by 70 to 120%), while enzyme dosage was more effective to improve xylose yields (by 37 to 57%). Compared to milling cycles and enzyme dosages, dilute acid pretreatment condition was the most important factor to increase final sugar yields.","abstract_has_math":false,"creators":["Kim, Sun Min"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Agricultural & Biological Engr","degree_department":null,"school":null,"contributors":["Singh, Vijay","Rausch, Kent D.","Tumbleson, M. E.","Jin, Yong-Su","Lee, DoKyoung","Basu, Rahul","Hensing, Marco","Dien, Bruce S."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2017,"date_issued":"2017-08-10T19:14:47Z","date_published":"2017-08-10T19:14:47Z","updated_at":"2026-07-22T22:24:32Z","subjects":["Disk milling","Commercial scale","Prairie cordgrass","Marginal land","Saline land","Dilute acid pretreatment","Hot water pretreatment","Cellulosic ethanol"],"languages":["en"],"rights":["Copyright 2017 Sun Min Kim"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/97313","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Singh, Vijay","Rausch, Kent D.","Tumbleson, M. 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To provide sufficient feedstock quantity, eleven natural populations of prairie cordgrass (Spartina pectinata L.) harvested in 2011 and 2012 were evaluated as a bioethanol feedstock. After dilute acid pretreatment and simultaneous saccharification and cofermentation (SScF), ethanol yields from prairie cordgrass reached 205 to 276 g/kg biomass and 1,379 to 3,446 kg/ha. These ethanol yields were comparable with those of switchgrass, corn stover and bagasse. To produce feedstocks in a sustainable manner, growing bioethanol feedstocks on marginal lands has been recommended. Ethanol production from prairie cordgrass and switchgrass grown on marginal lands were evaluated by performing dilute acid pretreatment and SScF. Plants grown on marginal lands had ethanol yields comparable to those of plants grown on optimal land. To increase enzyme accessibility to carbohydrates, hot water or dilute acid hydrolysis followed by disk milling was developed as a pretreatment method. Hot water or dilute acid pretreatment and disk milling acted synergistically to improve glucose and xylose yields by 89 and 134%, respectively, compared to hot water pretreatment alone. To take the combined pretreatment process one step closer to commercialization, disk milling was performed with commercially dilute acid pretreated corn stover. Effects of number of disk milling cycles and enzyme dosage on sugar yields were evaluated. Milling was more effective to improve glucose yields (by 70 to 120%), while enzyme dosage was more effective to improve xylose yields (by 37 to 57%). Compared to milling cycles and enzyme dosages, dilute acid pretreatment condition was the most important factor to increase final sugar yields.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2017-08-10 without embargo terms","The student, Sun Min Kim, accepted the attached license on 2017-04-10 at 13:48.","The student, Sun Min Kim, submitted this Dissertation for approval on 2017-04-10 at 13:51.","This Dissertation was approved for publication on 2017-04-18 at 10:21.","DSpace SAF Submission Ingestion Package generated from Vireo submission #10665 on 2017-08-10 at 13:38:53","Made available in DSpace on 2017-08-10T19:14:47Z (GMT). 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To provide sufficient feedstock quantity, eleven natural populations of prairie cordgrass (Spartina pectinata L.) harvested in 2011 and 2012 were evaluated as a bioethanol feedstock. After dilute acid pretreatment and simultaneous saccharification and cofermentation (SScF), ethanol yields from prairie cordgrass reached 205 to 276 g/kg biomass and 1,379 to 3,446 kg/ha. These ethanol yields were comparable with those of switchgrass, corn stover and bagasse. To produce feedstocks in a sustainable manner, growing bioethanol feedstocks on marginal lands has been recommended. Ethanol production from prairie cordgrass and switchgrass grown on marginal lands were evaluated by performing dilute acid pretreatment and SScF. Plants grown on marginal lands had ethanol yields comparable to those of plants grown on optimal land. To increase enzyme accessibility to carbohydrates, hot water or dilute acid hydrolysis followed by disk milling was developed as a pretreatment method. Hot water or dilute acid pretreatment and disk milling acted synergistically to improve glucose and xylose yields by 89 and 134%, respectively, compared to hot water pretreatment alone. To take the combined pretreatment process one step closer to commercialization, disk milling was performed with commercially dilute acid pretreated corn stover. Effects of number of disk milling cycles and enzyme dosage on sugar yields were evaluated. Milling was more effective to improve glucose yields (by 70 to 120%), while enzyme dosage was more effective to improve xylose yields (by 37 to 57%). Compared to milling cycles and enzyme dosages, dilute acid pretreatment condition was the most important factor to increase final sugar yields.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2017-08-10 without embargo terms","The student, Sun Min Kim, accepted the attached license on 2017-04-10 at 13:48.","The student, Sun Min Kim, submitted this Dissertation for approval on 2017-04-10 at 13:51.","This Dissertation was approved for publication on 2017-04-18 at 10:21.","DSpace SAF Submission Ingestion Package generated from Vireo submission #10665 on 2017-08-10 at 13:38:53","Made available in DSpace on 2017-08-10T19:14:47Z (GMT). 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