Fermentation,
Journal Year:
2024,
Volume and Issue:
10(12), P. 623 - 623
Published: Dec. 6, 2024
The
increasing
demand
for
efficient
and
sustainable
industrial
processes
has
accelerated
research
into
green
alternatives.
Gas
fermentation
in
a
trickle
bed
reactor
is
promising
technology;
however,
optimal
scaling
up
still
challenging.
A
mass
transfer
model
crucial
identifying
bottlenecks
suggesting
design
improvements
to
optimize
the
scale-up
of
TBR
gas
fermentation.
This
study
explores
effects
temperature,
dimensions,
packing
material
size
on
volumetric
coefficient
(kLa)
commercial-scale
(TBR).
Using
dynamic
modeling,
results
highlight
that
thermophilic
conditions
(60
°C)
significantly
enhance
kLa
rates
H2,
CO,
CO2,
despite
reduced
solubility
at
higher
temperatures.
Additionally,
smaller
particles
improves
by
surface
gas–liquid
interaction,
while
particularly
volume
diameter,
are
shown
critically
influence
kLa.
provides
valuable
insights
optimizing
scale-up,
emphasizing
importance
conditions,
proper
selection,
geometry
syngas
(a
mixture
CO2)
biological
conversion.
Overall,
findings
offer
practical
guidelines
enhancing
performance
industrial-scale
systems.
Energy Conversion and Management,
Journal Year:
2024,
Volume and Issue:
307, P. 118339 - 118339
Published: March 27, 2024
The
REPowerEU
plan
establishes
the
production
objective
of
35
billion
m3
biomethane
in
European
Union
(EU)
by
2030.
Biomethane
is
an
excellent
energy
vector
to
promote
defossilization
different
sectors
within
a
Power-to-Gas
approach.
present
study
evaluates
economic
and
environmental
implications
producing
from
biogas
generated
municipal
wastewater
treatment
plant
(WWTP)
with
capacity
100,000
m3/d
500,000
population
equivalents.
techno-economic
analysis
(TEA)
life
cycle
assessment
(LCA)
were
conducted
for
based
on
biological
methanation
process
using
hydrogen
produced
water
electrolyser.
TEA
illustrated
that
electricity
price
(0–0.20
€/kWh)
features
important
impact
cost
(0.05–0.23
€/kWhHHV)
due
high
electrolyser
consumption.
Flexible
operation
economically
feasible
at
load
factors
above
%,
which
can
be
attributed
lower
capital
as
factor
increases.
LCA
has
global
warming
(<0.28
kg
CO2-eq/kWhHHV)
than
fossil
natural
gas
when
renewable
mix
62
%.
results
highlighted
carbon
prices
under
EU
Emission
Trading
System
driver
countries
since
could
exempted
acquire
emission
allowances.
This
would
provide
competitive
advantage
over
considering
whole
supply
chain
carrier.
Overall,
this
demonstrates
potential
become
technology
future
scenarios.
Fermentation,
Journal Year:
2025,
Volume and Issue:
11(1), P. 43 - 43
Published: Jan. 18, 2025
The
biological
methanation
process
has
emerged
as
a
promising
alternative
to
thermo-catalytic
methods
due
its
ability
operate
under
milder
conditions.
However,
challenges
such
low
hydrogen
solubility
and
the
need
for
precise
trace
element
supplementation
(Fe(II),
Ni(II),
Co(II))
constrain
methane
production
yield.
This
study
investigates
combined
effects
of
concentrations
applied
pressure
on
methanation,
addressing
their
synergistic
interactions.
Using
face-centered
composite
design,
batch
mode
experiments
were
conducted
optimize
production.
Response
Surface
Methodology
(RSM)
Artificial
Neural
Network
(ANN)—Genetic
Algorithm
(GA)
approaches
employed
model
process.
RSM
identified
optimal
ranges
elements
pressure,
while
ANN-GA
demonstrated
superior
predictive
accuracy,
capturing
nonlinear
relationships
with
high
R²
(>0.99)
minimal
prediction
errors.
optimization
indicated
97.9%
efficiency
reduced
conversion
time
15.9
h
conditions
1.5
bar
metal
25.0
mg/L
Fe(II),
0.20
0.02
Co(II).
Validation
confirmed
these
predictions
deviations
below
5%,
underscoring
robustness
models.
results
highlight
metals
in
enhancing
gas–liquid
mass
transfer
enzymatic
pathways,
demonstrating
potential
computational
modeling
experimental
validation
systems,
contributing
sustainable
Biotechnology for Biofuels and Bioproducts,
Journal Year:
2024,
Volume and Issue:
17(1)
Published: May 15, 2024
Abstract
Background
Power-to-gas
is
the
pivotal
link
between
electricity
and
gas
infrastructure,
enabling
broader
integration
of
renewable
energy.
Yet,
enhancements
are
necessary
for
its
full
potential.
In
biomethanation
process,
transferring
H
2
into
liquid
phase
a
rate-limiting
step.
To
address
this,
we
developed
novel
tubular
foam-bed
reactor
(TFBR)
investigated
performance
at
laboratory
scale.
Results
A
non-ionic
polymeric
surfactant
(Pluronic
®
F-68)
1.5%
w/v
was
added
to
TFBR’s
culture
medium
generate
stabilized
foam
structure.
This
increased
both
gas–liquid
surface
area
bubble
retention
time.
Within
tubing,
cells
predominantly
traveled
evenly
suspended
in
or
were
entrapped
thin
film
bubbles
flowing
inside
tube.
Phase
(I)
experiment
focused
primarily
on
mesophilic
(40
°C)
operation
reactor,
followed
by
(II),
when
Pluronic
F-68
added.
TFBR
exhibited
6.5-fold
increase
biomethane
production
rate
(
MPR
)
15.1
$$({\text{L}}_{{\text{CH}}_{4}}\text{/}{\text{L}}_{\text{R}}\text{/d)}$$
(LCH4/LR/d)
,
with
CH
4
concentration
exceeding
90%
(grid
quality),
suggesting
improved
transfer.
Transitioning
(III)
continuous
55
°C,
reached
29.7
$${\text{L}}_{{\text{CH}}_{4}}\text{/}{\text{L}}_{\text{R}}\text{/d}$$
/d
while
maintaining
grid
quality
.
Despite,
reduced
solubility
mass
transfer
higher
temperatures,
twofold
compared
(II)
might
be
attributed
other
factors,
i.e.,
metabolic
activity
methanogenic
archaea.
assess
process
robustness
conditions,
partial
feeding
regime
(12
h
100%
12
10%
nominal
rate)
implemented.
demonstrated
resilient
approximately
14.8
even
intermittent,
low
concentration.
Conclusions
Overall,
plant
sets
course
an
accelerated
introduction
technology
storage
volatile
Robust
performance,
under
starvation,
underscores
reliability.
Further
steps
towards
optimum
scale-up
should
initiated.
Additionally,
use
systems
considered
biotechnological
processes
which
limiting
factor
achieving
reaction
rates.
Chemical Engineering Journal,
Journal Year:
2024,
Volume and Issue:
495, P. 153677 - 153677
Published: July 2, 2024
Achieving
carbon
neutrality
in
Europe
hinges
on
the
exploitation
of
renewable
energy
resources.
Although
these
resources
seem
plentiful,
critical
challenges
emerge
from
excess
that
cannot
be
effectively
stored
or
insufficient
electricity
production.
A
promising
approach
to
sustaining
a
balanced
network
aligns
production
with
demand
involves
integrating
transformation
surplus
into
biomethane
through
two-stage
process.
The
is
utilized
produce
hydrogen
water
electrolysis,
followed
by
biological
methanogenesis
and
dioxide
synthesize
biomethane.
Investigating
undersupply
scenarios
crucial
understanding
resilience
processes,
requiring
evaluation
intermittent
supply
modes
their
microbial
impacts.
present
study
focused
simulating
actual
demand-driven
operational
conditions
intermittently
halting
input
gas,
thereby
inducing
disruptions
within
processes.
Various
sequences
consecutive
starvation
regular
operation
phases,
spanning
one
five
weeks,
were
assessed.
experimental
framework
was
executed
two
thermophilic
Trickle
Bed
Reactors
under
anaerobic
conditions,
each
utilizing
distinct
packing
materials;
specifically,
activated
pellets
polyethylene
K1
Media
Raschig
rings.
objective
scrutinize
influence
materials
composition
output
process
stability
community.
Remarkably,
both
reactors,
biomethanation
demonstrated
high
adaptability,
capabilities
cease
recommence
almost
instantaneously,
even
following
five-week
period,
returning
performance
its
optimal
pre-starvation
state.
Microbial
fuel
cells
(MFCs)
continue
to
garner
significant
research
attention
as
promising
carbon-free
and
clean
alternative
energy
sources.
Nevertheless,
optimizing
their
power
output
organic
content
reduction
in
the
laboratory
remains
a
challenge.
Scaling
up
pilot-scale
experiments
is
time-consuming,
labour-intensive,
costly,
with
scaling
losses
being
uncertain.
This
chapter
discusses
application
of
computational
fluid
dynamics
(CFD)
bio-electrochemical
processes
optimization
MFCs.
