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Biogasproduktion från vall - Analys av metanpotential samt energi-­och miljösystemanalys

Särnholm, Mikael (2011) KBT820 20111
Biotechnology
Abstract
In these times, when global warming is escalating and the finite
resources of the world are consumed in a fast pace, it is very
important to find sustainable solutions for the near future. Transport
is one of the sectors that need to find alternative solutions to the
utilisation of fossil fuels. This master thesis investigates biogas
production from ley crops, which is a mixture of different species of
clover and grass. At first the methane potential was determined
through laboratory experiments to an average of 270 Nm3 CH4/ton TS or
50 Nm3 CH4/ton wet weight. It was concluded that there was no
significant difference in methane potential between ley crops
fertilized with bio fertilizer and mineral fertilizer. The methane
... (More)
In these times, when global warming is escalating and the finite
resources of the world are consumed in a fast pace, it is very
important to find sustainable solutions for the near future. Transport
is one of the sectors that need to find alternative solutions to the
utilisation of fossil fuels. This master thesis investigates biogas
production from ley crops, which is a mixture of different species of
clover and grass. At first the methane potential was determined
through laboratory experiments to an average of 270 Nm3 CH4/ton TS or
50 Nm3 CH4/ton wet weight. It was concluded that there was no
significant difference in methane potential between ley crops
fertilized with bio fertilizer and mineral fertilizer. The methane
potential from the first harvest was however significantly higher than
from the second harvest of the year. The average methane potential was
then used in an energy and environmental systems analysis, where
energy consumption and greenhouse gas emissions were analysed in a
cradle-to-grave perspective, covering all aspects from cultivation of
ley crops to bioconversion to biogas and use as a fuel for transport.
Comparing direct land use changes, the emissions where lower if the
ley crops were grown on land that had previously been used for
cultivation of grain, due to an increased soil carbon content, than if
it had been used for cultivation of ley crops. The study also showed
that if system expansion was used, which means that the digestion
residue produced was used as bio fertilizer replacing mineral
fertilizer, both energy consumption and emissions were lowered. The
energy input ranged from 28 to 38 percent of the produced biogas, and
the emissions ranged from 3 to 32 g CO2e per MJ of biogas. (Less)
Please use this url to cite or link to this publication:
author
Särnholm, Mikael
supervisor
organization
course
KBT820 20111
year
type
H3 - Professional qualifications (4 Years - )
subject
language
Swedish
id
1857523
date added to LUP
2011-03-21 11:25:48
date last changed
2011-03-22 23:16:42
@misc{1857523,
  abstract     = {In these times, when global warming is escalating and the finite
resources of the world are consumed in a fast pace, it is very
important to find sustainable solutions for the near future. Transport
is one of the sectors that need to find alternative solutions to the
utilisation of fossil fuels. This master thesis investigates biogas
production from ley crops, which is a mixture of different species of
clover and grass. At first the methane potential was determined
through laboratory experiments to an average of 270 Nm3 CH4/ton TS or
50 Nm3 CH4/ton wet weight. It was concluded that there was no
significant difference in methane potential between ley crops
fertilized with bio fertilizer and mineral fertilizer. The methane
potential from the first harvest was however significantly higher than
from the second harvest of the year. The average methane potential was
then used in an energy and environmental systems analysis, where
energy consumption and greenhouse gas emissions were analysed in a
cradle-to-grave perspective, covering all aspects from cultivation of
ley crops to bioconversion to biogas and use as a fuel for transport.
Comparing direct land use changes, the emissions where lower if the
ley crops were grown on land that had previously been used for
cultivation of grain, due to an increased soil carbon content, than if
it had been used for cultivation of ley crops. The study also showed
that if system expansion was used, which means that the digestion
residue produced was used as bio fertilizer replacing mineral
fertilizer, both energy consumption and emissions were lowered. The
energy input ranged from 28 to 38 percent of the produced biogas, and
the emissions ranged from 3 to 32 g CO2e per MJ of biogas.},
  author       = {Särnholm, Mikael},
  language     = {swe},
  note         = {Student Paper},
  title        = {Biogasproduktion från vall - Analys av metanpotential samt energi-­och miljösystemanalys},
  year         = {2011},
}