Show simple item record

dc.contributor.authorMabentsela, Nombongoen_US
dc.date.accessioned2011-10-03T08:45:18Z
dc.date.available2011-10-03T08:45:18Z
dc.date.issued2010en_US
dc.identifier.urihttp://hdl.handle.net/10394/4852
dc.descriptionThesis (M.Sc. Engineering Sciences (Chemical Engineering))--North-West University, Potchefstroom Campus, 2011.
dc.description.abstractThe severe effects associated with global warming and the rapid increase in oil prices are the driving forces behind the demand for clean carbon–neutral and biofuels such as bioethanol. Research studies are now focusing on using lignocellulosic biomass for bioethanol production due to concerns about food security and inflation. The chosen feedstock for this study was maize stover, given that it is the most abundant agricultural residue in South Africa. Maize stover consists of structural carbohydrates that can be enzymatically converted into fermentable sugars. The major drawback in the production of bioethanol from lignocellulosic biomass has been its high equipment and operational costs due to the use of acids and high enzyme loadings. The aim of this study was to investigate the possibility of optimizing the enzyme hydrolysis of pre–treated maize stover without further increasing the amount of enzymes. The maximum glucose yield attained was 690 ± 35 mg of glucose per gram of substrate which is equivalent to a conversion efficiency of 119%. The preferred pre–treatment method used was 3% sulphuric acid for 60 minutes at 121oC and the enzymatic hydrolysis process was performed at a 5% substrate loading, 50oC and pH 5.0 using 30 FPU per gram of cellulose in the presence of 1.25 g.L–1 of Tween 80 for 48 hours. The addition of Tween 80 increased the glucose yields by 23 % and thus, it has the potential of lowering the overall process costs by increasing the glucose yield without further addition of enzymes. Keywords: Bioethanol, maize stover, lignocellulosic biomass, pre–treatment, enzymatic hydrolysisen_US
dc.publisherNorth-West University
dc.subjectBioethanolen_US
dc.subjectMaize stoveren_US
dc.subjectLignocellulosic biomassen_US
dc.subjectPre-treatmenten_US
dc.subjectEnzymatic hydrolysisen_US
dc.subjectTween 80en_US
dc.subjectBioetanolen_US
dc.subjectMieliestronkeen_US
dc.subjectHoutagtige sellulose-biomassaen_US
dc.subjectVoorbehandelingen_US
dc.subjectEnsiemhidroliseen_US
dc.titleOptimization of the enzymatic conversion of maize stover to bioethanolen
dc.typeThesisen_US
dc.description.thesistypeMastersen_US


Files in this item

Thumbnail

This item appears in the following Collection(s)

  • ETD@PUK [6404]
    This collection contains the original digitized versions of research conducted at the North-West University (Potchefstroom Campus)

Show simple item record