Engineered
nanomaterials
(ENMs)
have
been
reported
to
facilitate
extracellular
electron
transfer
(EET)
by
increasing
the
electrical
conductivity
of
electroactive
biofilms.
However,
mechanisms
between
different
and
anoxygenic
photoelectrogenic
bacteria
for
degrading
organic
pollutants
remain
unclear.
In
this
study,
we
investigated
mechanism
metronidazole(MNZ)
degradation
concentrations
carbon
nanotubes
(CNTs),
Iron(III)
oxide
(Fe3O4)
NPs,
titanium
dioxide
(TiO2)
NPs
in
R.palustris
based
At
74μg/L,
CNTs
enhance
electrochemical
activity
EET
capacity
biofilm,
possibly
DNA
concentration
cellular
cathodic
biofilm.
at
high
concentrations,
ecological
toxicity
significantly
amplified,
resulting
a
decline
MNZ
rate
(0.29179h-1
185μg/L
0.27801h-1
370μg/L).
TiO2NPs
only
photosynthetic
current
(37.7%)
(48.65%)
compared
control
group.
A
(370μg/L)
boosts
(133%
increase)
via
photocatalytic
activity.
But
it
thinned
biofilm
inhibited
EET.
Fe3O4NPs
strengthened
from
low
(74-370μg/L),
promoting
185μg/L,
increased
138%
142%,
respectively.
excessive
may
limit
utilization
iron
ions
Moderate
(74-185μg/L)
can
microbial
improve
performance
extraction
degradation.
These
findings
were
not
important
optimizing
biofilms
but
also
regulating
impact
natural
environments.
Water,
Год журнала:
2024,
Номер
16(15), С. 2116 - 2116
Опубликована: Июль 26, 2024
To
expedite
enrichment
of
anaerobic
ammonia-oxidizing
bacteria
(AnAOB)
as
a
way
to
reduce
the
start-up
time,
leading
quicker
transition
into
stable
operation,
ammonia
oxidation
(anammox)
process
was
initiated
by
biofilm
reactor
with
polyurethane
porous
material.
The
anammox
studied
progressively
increasing
influent
substrate
concentration
while
simultaneously
decreasing
hydraulic
retention
time.
Following
73
d
and
subsequent
103
phase,
removal
rates
nitrite
reached
97.87%
99.96%,
respectively,
community
characterized
development
brick-red
biofilms
granules.
predominant
bacterial
phyla
within
were
Planctomycetota,
Chloroflexi,
Proteobacteria,
relative
abundances
25.25%,
29.41%,
14.3%,
dominant
genus
Candidatus
brocadia,
comprising
20.44%
microbial
community.
These
findings
indicate
that
material
is
conducive
AnAOB.
After
enrichment,
exhibited
significant
richness
diversity,
primary
group.
Process Safety and Environmental Protection,
Год журнала:
2023,
Номер
182, С. 894 - 902
Опубликована: Дек. 9, 2023
The
anaerobic
ammonium
oxidation
(anammox)
application
on
mainstream
wastewater
treatment
is
limited
by
the
ambient
environment
and
slow
growth
rate
of
anammox
bacteria.
Bulk
liquid
in
established
granular
sludge
bioreactors
naturally
contains
active
factors
that
could
potentially
boost
process
under
suboptimal
conditions.
In
this
study,
effluent
a
sludge-based
up-flow
blanket
treating
ammonium-rich
was
harvested
(the
named
as
UAE)
continuously
added
into
bioreactor
low-strength
at
25
°C
to
study
effects
mechanisms
enhancing
process.
NH4+-N
removal
efficiencies
increased
from
6.5-32.5%
89.7%-93.8%,
genera
accounted
0.1%
12.1%
microbial
community
receiving
reactor
with
UAE
addition.
Coupled
partial
denitrification
dissimilatory
nitrate
reduction
(DNRA)
processes
were
stimulated
Metagenomic
analysis
showed
acyl-homoserine
lactone-dependent
quorum
sensing
molecules
synthesis
pathway
enhanced
an
concentration
C8-HSL
2.59
ng/L
4.62
observed
UAE-receiving
reactor.
Selective
amino
acid
transportation,
acids
biosynthesis
energy
metabolic
pathways
upregulated
We
demonstrate
biocatalyst
facilitate
deeper
understanding
for
synergistic
effect
modified
microhabitat
metabolism
