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Titill

Biofuel Production Methods Based on Icelandic Feedstocks: An Environmental and Economic Comparison

Útdráttur

Due to rising concerns of energy security and the environmental implications of
using fossil fuels, there is a need to explore other fuel options. The objective of
this thesis is to compare different biofuel production methods from an
environmental and economic perspective and to evaluate potential implications
for Iceland. The environmental implications are assessed using a “well-to-tank”
(WTT) perspective, meaning in general terms the boundaries extend from the
cultivation and harvest, feedstock transport, biofuel production, and finally biofuel
transport. Economic implications are assessed using conventional break-even
point analysis.
Results indicate that when bioethanol is produced from timber employing a biochemical
conversion method, this yields the least impact (7.26 CO2 eq. g/MJ) to
environmental categories such as global warming potential (GWP), however if
using the thermal-chemical platform, the utilization of timber to produce Fisher-
Tropsch biodiesel (FTD) has the least impact to acidification potential (AP) (01 to
.14 SO2 eq. g/MJ). At the same time, FTD had the highest and lowest impact to
POCP, depending on the feedstock (.01 to .09 C2H4 eq. g/MJ). Both types of
technology reported the same in regard to eutrophication potential (EP) and that
the application of fertilizer from cultivation had the largest impact. In contrast,
when the organic fraction of municipal solid waste is used to make bioethanol
and biodiesel from rapeseed this yielded the largest impact to GWP (86 to 80
CO2 eq. g/MJ) explained by the high moisture content, transportation and low
lignin content. However, more research is needed to estimate the environmental
impact in the production of biofuels in Iceland, based on Icelandic circumstances.
In conclusion based on quantity estimates of the selected Icelandic feedstocks
and assuming that equal hectares of land as already cultivated land, is
transformed to producing energy crops and increasing forest cover by 300%,
beyond what is already planned, the potential quantity of displaced petroleum
products in Iceland ranges from <0.1 % (FTD-recycled newspaper) to 68%
(second generation bioethanol from wheat).

Birting
29.5.2009


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