Bioenergetic Modeling of the Relationship Between Voltage and Electroactive Microbial Biomass Yield for Bioelectrochemical Carbon Dioxide Reduction to Methane
Fermentation,
Journal Year:
2025,
Volume and Issue:
11(1), P. 40 - 40
Published: Jan. 17, 2025
Optimal
product
synthesis
in
bioelectrochemical
systems
(BESs)
requires
a
comprehensive
understanding
of
the
relationship
between
external
voltage
and
microbial
yield.
While
most
studies
assume
constant
growth
yields
or
rely
on
empirical
estimates,
this
study
presents
novel
thermodynamic
model,
linking
anodic
oxidation
cathodic
carbon
dioxide
(CO2)
reduction
to
methane
(CH4)
by
growing
biofilm.
Through
integrating
theoretical
Gibbs
free
energy
calculations,
model
predicts
electron
proton
transfers
for
autotrophic
methanogen
anode-respiring
bacteria
(ARB)
growth,
accounting
varying
applied
voltages
substrate
concentrations.
The
findings
identify
an
optimal
potential
−0.3
V
vs.
standard
hydrogen
electrode
(SHE)
maximizing
CH4
production
under
conditions
(pH
7,
25
°C,
1
atm)
regardless
ohmic
losses.
bridges
stoichiometry
biofilms,
addressing
research
gaps
simulating
biofilm
simultaneously.
Additionally,
sensitivity
analyses
reveal
that
lower
concentrations
require
more
negative
than
condition
stimulate
growth.
was
validated
using
experimental
data,
demonstrating
reasonable
predictions
biomass
yield
different
operating
multi
system.
results
show
higher
inputs
increase
while
reducing
output
due
non-optimal
voltage.
This
provides
tool
optimizing
BES
performance
enhance
recovery
stability.
These
insights
contribute
finding
optimum
highest
efficient
CO2
scaling
up
technology.
Language: Английский
Optimization of simultaneous wastewater treatment and methane recovery via tubular upflow bioelectrochemical reactor outfitted with heat-treated steel electrodes.
Results in Engineering,
Journal Year:
2025,
Volume and Issue:
unknown, P. 104673 - 104673
Published: March 1, 2025
Language: Английский