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Enzyme
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Prof. Dr. Annegret StarkSMRI Sugarcane Biorefinery Research
ChairUniversity of KwaZulu-NatalSchool of Engineering, Discipline
of Chemical EngineeringKing George V Avenue, Durban, 4041, South
AfricaTelephone: +21 (0)31 260 3383Email: [email protected]:
www.ukzn.ac.za
Durban, 14thAugust 2015
Seminar talk by Dr. Adnan Cavka
Dear colleagues and students,It is my pleasure to invite you to
the presentation of
Speaker: Dr. Adnan Cavka, from Ume University in SwedenTitle:
Biorefining of lignocellulose detoxification, on-site enzyme
production and techno-economic evaluationTime: Friday,
21.08.2015 14:00 15:30Venue: UNITE Lecture Hall, Howard Campus
I am looking forward to this event!
Best regards,
Abstract
A new approach to achieve efficient detoxification of inhibitory
lignocellulosic slurries andhydrolysates using reducing agents,
such as sodium dithionite, sodium sulfite and sodium
borohydride is presented. Results from laboratory and
demonstration scale experimentsindicate that additions of as low as
10-15 mM of reducing agents may considerably improvethe
fermentability of lignocellulosic hydrolysates, even under mild
reaction conditions (20-25oC, pH 5.5-6.0, and 5-10 min.).
Improvements in fermentability achieved with reducingagents under
these conditions are similar to those achieved with more complex
alkalidetoxification methods (55oC, pH 9.0, and 3h).The possibility
to produce enzyme on-site as co-products with production of
biofuels usingrecombinant Aspergillus niger and low-value residual
streams, such as stillage, is also
presented and discussed. Experimental results show that
fermentations performed with nutrientpoor industrial stillages from
processes based on waste fiber sludge yield similar xylanase
andcellulase activities as fermentations performed with nutrient
rich synthetic media (10%glucose).Results from a techno-economic
evaluation performed on the above described detoxificationmethods
are also presented with emphasis on lower yeast and enzymes loads,
as well as impactson operating costs and capital expenditure.
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Enzyme
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Sypnopsis of CVDr. Adnan Cavka is currently a post-doctoral
researcher in the group of Prof. Leif Jnsson atUme University in
Sweden. He holds a PhD in technical chemistry, as well as MSc
inanalytical chemistry, an MBA in management and an MSc in business
and economics. Adnan
was one of 10 PhD candidates that were selected and trained in
an Industrial Executive Programat Ume University. His project was
funded by SEKAB E-Technology, and performed in closecollaboration
with the forest biorefinery in rnskldsvik, Sweden.
