ACS ES&T Engineering,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Oct. 15, 2024
Phototrophs
with
heterotrophic
bacterial
consortium
as
an
electrode
biocatalyst
are
emerging
concept
for
developing
naturally
sustained
biophotovoltaic
systems.
Herein,
Spirulina
subsalsa-based
mixed
community
anodic
catalyst
in
a
microbial
fuel
cell
(MFC)
setup
ferricyanide
catholyte
78
days
light–dark
(16–8
h)
cycle-based
operation
was
investigated.
The
biofilm
developed
inducted
recalcitrant
comprising
Halomonas,
Alcanivorax,
Pelagibacterium,
and
Rhizobiales
the
major
genera.
In
extended
dark
phase
(9
days)
within
cyclic
operation,
sequential
shift
of
metabolism
from
photosynthesis
to
fermentative
states
increased
population
were
observed.
Under
direct
contact
graphite
anode,
initiated
oscillating
open-circuit
potentials
MFC
response
circadian
trend.
delivered
maxima
587
μW
m–2
418
(at
10
kΩ)
under
corresponding
phases,
respectively.
potential
shifted
more
negative
value,
reaching
−415.5
mV
starvation
period.
Analyses
reaction
rates
(extracted
Tafel
plots),
corrosion
potential,
current,
polarization
resistance,
residual
redox
charges
voltammograms)
performed
understand
processes.
Two
peaks
0.6
V
(irreversible,
extracellular)
0.26
(reversible,
cell-surface
attached)
attributed
mediation
this
process.
Additionally,
catholyte-diffused
interacts
biofilm,
getting
trapped
matrix
polymeric
structures,
thus
preventing
sudden
cytotoxic
elimination
cells
promoting
oxidative
charge
accumulation
over
its
surface,
improving
potential.
Rapid
respiratory
oxygen
consumption,
biofilm's
structural
reorganization,
ferricyanide's
chemical
speciation
inside
primary
factors
that
govern
performance
biofuel
during
prolonged
operations.
critical
findings
unveiled
through
study
advance
our
understanding
resilience
phototroph-based
multispecies
catalysts
devices
long-term
Frontiers of Environmental Science & Engineering,
Journal Year:
2024,
Volume and Issue:
18(7)
Published: March 25, 2024
Abstract
Wastewater
treatment
plants
are
the
major
energy
consumers
and
significant
sources
of
greenhouse
gas
emissions,
among
which
biological
nitrogen
removal
wastewater
is
an
important
contributor
to
carbon
emissions.
However,
traditional
heterotrophic
denitrification
still
has
problems
excessive
residual
sludge
requirement
external
sources.
Consequently,
development
innovative
low-carbon
nitrate
technologies
necessary.
This
review
outlines
key
roles
sulfur
autotrophic
hydrogen
in
treatment.
The
discovered
nitrate/nitrite
dependent
anaerobic
methane
oxidation
enables
sustainable
emission
reduction
by
utilizing
available
situ
.
Photosynthetic
microorganisms
exhibited
a
promising
potential
achieve
carbon-negative
removal.
Specifically,
algal-bacterial
symbiosis
system
photogranules
offer
effective
prospective
options
for
Then,
emerging
technology
photoelectrotrophic
underlying
photoelectron
transfer
mechanisms
discussed.
Finally,
we
summarize
prospect
these
technologies,
highlighting
that
solar-driven
area
future
guiding
significance
design
systems.
Abstract
Interactions
between
algae
and
bacteria
are
pivotal
in
transforming
complex
organics
for
microalgal-bacterial
granular
sludge
process,
but
the
intrinsic
removal
mechanisms
have
not
been
well
understood.
Here,
we
investigate
by
which
removed
from
municipal
wastewater.
Complex
can
be
disposed
during
day-night
cycles,
significantly
impacted
carbon-to-nitrogen
ratio
influent.
Upregulated
gap2
gpmA
genes
enhanced
conversion
of
into
CO
2
,
mediated
interactions
Chlorophyceae
with
Acidobacteriae
/
Sumerlaeia
Fimbriimonadia
upregulated
petH
gene
Cyanobacteria
strengthened
fixation
biomass.
The
breakdown
starch,
glycerol,
fatty
acid
were
depended
on
Actinobacteriota
Chloroflexia
Verrucomicrobiae
Desulfobacterota
I
respectively.
These
findings
provide
new
insights
through
symbiosis
contribute
to
our
understanding
carbon
cycle
natural
aquatic
ecosystems.
Applied Microbiology and Biotechnology,
Journal Year:
2024,
Volume and Issue:
108(1)
Published: July 4, 2024
Abstract
Co-aggregation
of
anaerobic
microorganisms
into
suspended
microbial
biofilms
(aggregates)
serves
ecological
and
biotechnological
functions.
Tightly
packed
aggregates
metabolically
interdependent
bacteria
archaea
play
key
roles
in
cycling
carbon
nitrogen.
Additionally,
applications,
such
as
wastewater
treatment,
provide
a
complete
metabolic
network
to
convert
complex
organic
material.
Currently,
experimental
data
explaining
the
mechanisms
behind
co-aggregation
anoxic
environments
is
scarce
scattered
across
literature.
To
what
extent
does
this
process
resemble
aerobic
environments?
Does
limited
availability
terminal
electron
acceptors
drive
mutualistic
relationships,
contrary
commensal
relationships
observed
oxygen-rich
And
do
co-aggregating
archaea,
which
depend
on
each
other
harvest
bare
minimum
Gibbs
energy
from
energy-poor
substrates,
use
similar
cellular
those
used
by
pathogenic
that
form
biofilms?
Here,
we
an
overview
current
understanding
why
how
mixed
communities
co-aggregate
discuss
potential
future
scientific
advancements
could
improve
study
aggregates.
Key
points
•
Metabolic
dependency
promotes
aggregation
Flagella,
pili,
adhesins
role
formation
Cyclic
di-GMP/AMP
signaling
may
trigger
polysaccharides
production
anaerobes
