The aim of the study was to evaluate,from an economic standpoint,the feasibility of using sugar beet pulp(SBP)as the feedstock in an existing sugar processing plant to ethanol.Two base cases were studied.Case 1 incorp...The aim of the study was to evaluate,from an economic standpoint,the feasibility of using sugar beet pulp(SBP)as the feedstock in an existing sugar processing plant to ethanol.Two base cases were studied.Case 1 incorporated dilute sulfuric acid pretreatment,enzymatic hydrolysis,and fermentation using S.cervisiae.Case 2 neglected the pretreatment step and used a series of enzymes in Simultaneous Saccharification and Fermentation(SSF)with S.cervisiae yeast followed by E.coli K011 fermentation.The ethanol production cost for each case was estimated to be$1.50 and$1.10 per gallon of ethanol for case 1 and case 2,respectively.Assuming a 10%discount rate,a minimum selling price of$2.35 per gallon was obtained for case 1 and$1.53 per gallon for case 2.These prices can be competitive with the increasing gasoline prices.However,base case 2 has higher potential to be feasible with the discovery of efficient microbial species.展开更多
基金We thank Dr.Scott Pryor and Rachel Rorick at the North Dakota State University for allowing us to use their results in this work.We thank Dr.Mike Mann and Dr.Robert Wills at the University of North Dakota for their help in reviewing this paper.We also thank the American Crystal Sugar Company(East Grand Forks,MN 56721)for providing us with the SBPand Genencor(Palo Alto,CA 94304)for providing us all the enzymes.Lastly,we acknowledge North Dakota EPSCoR for funding the project.
文摘The aim of the study was to evaluate,from an economic standpoint,the feasibility of using sugar beet pulp(SBP)as the feedstock in an existing sugar processing plant to ethanol.Two base cases were studied.Case 1 incorporated dilute sulfuric acid pretreatment,enzymatic hydrolysis,and fermentation using S.cervisiae.Case 2 neglected the pretreatment step and used a series of enzymes in Simultaneous Saccharification and Fermentation(SSF)with S.cervisiae yeast followed by E.coli K011 fermentation.The ethanol production cost for each case was estimated to be$1.50 and$1.10 per gallon of ethanol for case 1 and case 2,respectively.Assuming a 10%discount rate,a minimum selling price of$2.35 per gallon was obtained for case 1 and$1.53 per gallon for case 2.These prices can be competitive with the increasing gasoline prices.However,base case 2 has higher potential to be feasible with the discovery of efficient microbial species.
