Journal of Cleaner Production,
Journal Year:
2023,
Volume and Issue:
401, P. 136762 - 136762
Published: March 11, 2023
Nowadays,
biogas
produced
from
the
anaerobic
digestion
of
biowaste
is
considered
a
valuable
renewable
energy
source
to
implement
transition
climate-neutral
society.
Recently,
upgrading
biomethane,
instead
usual
co-generation
heat
and
electricity
(CHP),
has
been
an
attractive
option,
as
biomethane
can
be
used
for
different
purposes.
This
study
performed
life
cycle
assessment
(LCA)
costing
(LCC)
scenarios
valorization
co-digestion
(AcoD)
secondary
sewage
sludge
(SS)
organic
fraction
municipal
solid
waste
(OFMSW),
pre-treated
by
dark
co-fermentation
(DF)
process.
Four
configurations
were
compared,
exploring
recovery
one
or
more
following:
heat,
biomethane.
Furthermore,
two
sensitivity
analyses
on
LCA
analysis,
considering
use
fuel
transport
European
mix
expected
2050,
respectively.
The
CHP
was
most
environmentally
friendly
solutions
in
8
out
11
impact
categories
provided
CML-IA
baseline
method;
however,
upgrading-based
showed
less
impacts
relevant
categories,
such
global
warming
potential
(up
−1.14E+05
kg
CO2
eq.
y−1)
ozone
layer
depletion
−4.73E-01
CFC-11
y−1).
Sensitivity
confirmed
that
processes
should
have
generally
lower
climate
change
than
systems.
replace
petrol
resulted
best
option
terms
−5.67E+05
All
proposed
represented
economically
sustainable
projects,
they
reported
positive
net
present
values
(NPV)
20
years
10,518,291
€).
Biogas
highest
NPVs;
nevertheless,
combined
production
cost-effective
thanks
revenues
sales,
despite
latter
being
modest.
In
conclusion,
contrary
previous
studies
literature,
we
found
not
neglected,
optimal
configuration
may
lie
heat.
