Microbial
electrosynthesis
(MES)
cell
use
is
an
innovative
approach
for
single-cell
proteins
(SCP)
production.
Coupling
MES
with
the
valorization
of
CO2
from
anaerobic
digestion
and
nitrogen
livestock
effluents
has
beneficial
environmental
effects,
reducing
greenhouse
gas
emissions
overloading.
In
addition,
power
needed
can
come
surplus
renewable
energy.
this
study,
a
biochar-functionalized
cathode
was
tested
at
varying
polarizations,
i.e.
non
polarized,
-0.6
V
-1.0
vs
Ag/AgCl,
biogas-derived
recovered
ammonia
pig
slurry
supplied.
Negative
polarization
switched
microbial
community
heterotrophic,
typical
unpolarized
MES,
to
mix
both
heterotrophic
autotrophic/electrotrophic
communities
mainly
V.
The
more
negative
allowed
highest
N
capture,
39
±
2
%
supplied
CO2,
6.7
0.8
N.
biomass
characterization
indicated
protein
content
on
dry
matter
basis
33.1
1.3
(unpolarized),
43.2
0.6
(-0.6
V)
69.1
1.0
(-1.0
V).
amino
acids
profiles
investigated
showed
high
nutritional
value
produced
biomass,
not
far
those
conventional
sources
used
producing
feed/food.
npj Materials Sustainability,
Journal Year:
2024,
Volume and Issue:
2(1)
Published: March 26, 2024
Abstract
The
conversion
of
carbon
dioxide
to
medium-chain
fatty
acids
(CO
2
-to-MCFAs)
through
microbial
processes
represents
a
valuable
technology
for
sequestering
and
exploiting
CO
,
generating
superior
bio-chemicals
from
the
primary
contributor
greenhouse
effect.
However,
comprehensive
overview
generalization
-to-MCFAs
are
presently
deficient.
Based
on
this,
present
review
systematically
summarizes
research
progress,
explicates
process
mechanisms,
analyses
key
challenges
possible
solutions,
anticipates
forthcoming
perspectives
priorities
first
time.
We
proposed
two
original
strategies,
namely
synchronous
strategy
integrated
strategy,
current
into
-to-MCFAs.
concurrently
achieves
hydrogen
(H
)
assimilation,
as
well
MCFAs
production,
by
employing
reactor
that
co-cultivates
predominant
H
/CO
-utilizing
microorganisms
chain
elongation
microorganisms.
approaches
involve
-to-precursors
(i.e.,
acetate
ethanol)
subsequent
precursors-to-MCFAs,
achieved
use
bioreactors
separately
cultivating
Mechanistic
insights
reveal
predominantly
encompasses
processes:
assimilation
precursor
precursors
MCFAs,
Wood-Ljungdahl
pathway
two-round
elongation,
respectively.
solutions
underscore
imperative
enhance
efficiency
economy
shed
light
metabolic
mechanisms.
Furthermore,
in
order
improve
application
potential
-to-MCFAs,
future
priorities,
e.g.
exploitation
functional
pure
bacteria,
screening
multi-omics
analysis,
genetic
modification
enhancement,
enhancement
bioreactor
stability,
specific
MCFA
development
coupled
purification
economic
benefits
ecological
environmental
risks,
prospected.
This
work
is
expected
offer
thorough
understanding
guide
inspire
researchers
address
critical
in-depth
propel
Fermentation,
Journal Year:
2025,
Volume and Issue:
11(4), P. 172 - 172
Published: March 26, 2025
Volatile
fatty
acids
(VFAs)
are
inevitable
intermediates
of
biogas
production
during
the
anaerobic
digestion
organic
matter.
The
excessive
accumulation
VFAs
leads
to
a
pH
drop
and
strong
inhibition
methanogenesis.
On
other
hand,
useful
commodities
with
different
applications,
their
fermentative
may
compete
traditional
methods
based
on
oil
derivatives.
fermentation
have
commonalities
biorefinery
concept.
present
review
considers
VFA
together
competitive
simultaneous
hydrogen
production.
Methods
enhanced
volatile
presented,
showing
option
integrated
processes
product
removal
energy
from
obtained
biogas.
basis
review,
following
conclusion
can
be
drawn.
(formic,
acetic,
propionic,
butyric
ones)
various
applications.
That
is
why
targeted
desired
rate
shift
aims
toward
instead
release.
combined
release
make
overall
process
self-consistent,
sufficient
maintain
target
using
for
heating
digestor.
maintenance
optimum
concentrations
accomplished
by
broth,
thus
integrating
recovery
operation
conditions
in
digester.
substrate
preparation
operating
(organic
loading
hydraulic
retention
time)
crucial
importance
successful
process.
Renewable Energy,
Journal Year:
2024,
Volume and Issue:
229, P. 120761 - 120761
Published: June 4, 2024
Microbial
electrosynthesis
(MES)
cell
use
is
an
innovative
approach
for
single-cell
proteins
(SCP)
production.
Coupling
MES
with
the
valorization
of
CO2
from
anaerobic
digestion
and
nitrogen
livestock
effluents
has
beneficial
environmental
effects,
reducing
greenhouse
gas
emissions
overloading.
In
addition,
power
needed
can
come
surplus
renewable
energy.
this
study,
a
biochar-functionalized
cathode
was
tested
at
varying
polarizations,
i.e.
non
polarized,
-0.6
V
-1.0
vs
Ag/AgCl,
biogas-derived
recovered
ammonia
pig
slurry
supplied.
Negative
polarization
switched
microbial
community
heterotrophic,
typical
unpolarized
MES,
to
mix
both
heterotrophic
autotrophic/electrotrophic
communities
mainly
V.
The
more
negative
allowed
highest
N
capture,
39
±
2
%
supplied
CO2,
6.7
0.8
N.
biomass
characterization
indicated
protein
content
on
dry
matter
basis
33.1
1.3
(unpolarized),
43.2
0.6
(-0.6
V)
69.1
1.0
(-1.0
V).
amino
acids
profiles
investigated
showed
high
nutritional
value
produced
biomass,
not
far
those
conventional
sources
used
producing
feed/food.
