Evaluation of nitrous oxide reduction in solid carbon source-driven counter-diffusional biofilm denitrification system
Water Research X,
Год журнала:
2025,
Номер
27, С. 100306 - 100306
Опубликована: Янв. 22, 2025
Solid
carbon-driven
biofilm
system
can
provide
sufficient
carbon
source
for
denitrification,
while
its
counter-diffusional
structure
could
inevitably
induce
the
delayed
carbon-nitrogen
contact
and
electron
transport,
further
affecting
footprints
mainly
contributed
by
nitrous
oxide
(N2O)
at
wastewater
treatment
plants
(WWTPs).
However,
detailed
understanding
of
N2O
dynamics
during
solid-phase
denitrification
(SPD)
has
not
been
disclosed.
In
this
work,
a
fixed
bed
bioreactor
driven
polycaprolactone
(PCL)
was
constructed
operated
over
180
days,
achieving
97
%-99
%
total
nitrogen
(TN)
removal
efficiency.
Biochemical
results
indicated
that
under
condition
each
(NO
x
)
concentration
maintained
30
mg-N/L,
competition
between
upstream
downstream
pools
still
observed
PCL-driven
even
providing
source.
For
example,
coexistent
nitrate
(NO3
-)+
nitrite
(NO2
-)+N2O
condition,
few
electrons
(i.e.,
12.6
%)
distributed
to
reductase
(Nos),
significantly
decreasing
reduction
rate
1.42
mg/g
VSS/h).
Under
TN
in
scheme
containing
NO3
-+NO2
-+N2O
be
1.75-2.3
times
higher
than
with
sole
NO
mg-N/L.
This
suggested
when
treating
multiple
,
only
relatively
improve
efficiency,
but
also
alleviate
emissions.
The
abundance
Bacteroidota
Comamonadaceae
ensured
stable
release
conversion
states.
Язык: Английский
PHA Microplastic Aging Decreases N2O Sink Capacity: Released γ-Butyrolactone Decouples Denitrifying Electron Transfer and Oxidative Phosphorylation
Environmental Science & Technology,
Год журнала:
2025,
Номер
59(2), С. 1298 - 1307
Опубликована: Янв. 9, 2025
Bacterial
denitrification
is
a
main
pathway
for
soil
N2O
sinks,
which
crucial
assessing
and
controlling
emissions.
Biobased
polyhydroxyalkanoate
(PHA)
microplastic
particles
(MPs)
degrade
slowly
in
conventional
environments,
remaining
inert
extended
periods.
However,
the
impacts
of
PHA
aging
on
bacterial
sink
capacity
before
degradation
remain
poorly
understood.
Here,
model
strain
Paracoccus
denitrificans
was
exposed
to
0.05-0.5%
(w/w)
virgin
aged
MPs.
Although
no
significant
changes
molecular
weights
were
observed,
MPs
hindered
cell
growth
reduction
rates,
leading
surge
1H
NMR
spectroscopy
UPLC-QTOF-MS
analysis
identified
γ-butyrolactone
as
key
component
released
from
Metabolic
verifications
at
cellular
level
confirmed
its
inhibition
ATP
synthesis.
The
that
protonated
hydrolyzed
spontaneously
periplasm
would
compete
protons
with
ATPase
destroy
coupling
between
denitrifying
electron
transfer
oxidative
phosphorylation.
Consequently,
energy-deficient
cells
reduced
supply
reduction,
did
not
contribute
energy
conservation.
This
work
unveils
novel
mechanism
by
impairs
highlights
need
consider
environmental
risks
posed
biobased
aging.
Язык: Английский
Less toxic combined microplastics exposure towards attached Chlorella sorokiniana in the presence of sulfamethoxazole while massive microalgal nitrous oxide emission under multiple stresses
Journal of Hazardous Materials,
Год журнала:
2025,
Номер
487, С. 137223 - 137223
Опубликована: Янв. 14, 2025
Язык: Английский
Biodegradable microplastics aggravate greenhouse gas emissions from urban lake sediments more severely than conventional microplastics
Water Research,
Год журнала:
2024,
Номер
266, С. 122334 - 122334
Опубликована: Авг. 25, 2024
Язык: Английский
Responses of SNEDPR-AGS system under long-term exposure of polyethylene terephthalate microplastics for treating low C/N wastewater: granular effect and microbial structure
Journal of Hazardous Materials,
Год журнала:
2024,
Номер
unknown, С. 136299 - 136299
Опубликована: Окт. 1, 2024
Язык: Английский
Enhancing sulfide and methane control in sewers: Unveiling the impact and mechanisms of free nitrous acid pre-exposure coupled with calcium peroxide dosing
Chemical Engineering Journal,
Год журнала:
2024,
Номер
495, С. 153576 - 153576
Опубликована: Июнь 28, 2024
Язык: Английский
Microplastics and Climate Change: Unveiling Ecological Impacts and Addressing Research Gaps
Опубликована: Авг. 19, 2024
Microplastics,
pervasive
in
both
terrestrial
and
aquatic
ecosystems,
have
emerged
as
significant
contributors
to
greenhouse
gas
(GHG)
emissions,
including
carbon
dioxide
(CO2),
methane
(CH4),
nitrous
oxide
(N2O).
This
review
synthesizes
recent
studies
from
2022
2024,
revealing
the
complex
mechanisms
through
which
microplastics
influence
GHG
production.
These
include
adsorption
of
nutrients
pollutants
onto
microplastic
surfaces
their
role
substrates
for
microbial
colonization.
The
impacts
vary
significantly
across
different
environments,
such
agricultural
soils
marine
sediments.
underscores
urgent
need
standardized
methodologies
long-term
field
accurately
assess
ecological
consequences
microplastics.
Notably,
(N2O),
a
potent
with
global
warming
potential
nearly
300
times
that
CO2,
remains
underexplored
context
interactions,
highlighting
critical
research
gap.
Additionally,
synergistic
effects
other
require
further
investigation
understand
cumulative
impact
on
emissions
fully.
calls
coordinated
effort
among
researchers
policymakers
advance
our
understanding
microplastics'
budgets
develop
effective
strategies
mitigating
environmental
climatic
impacts.
Язык: Английский
Microplastics and Climate Change: Unveiling Ecological Impacts and Addressing Research Gaps
Опубликована: Авг. 28, 2024
Microplastics,
pervasive
in
both
terrestrial
and
aquatic
ecosystems,
have
emerged
as
significant
contributors
to
greenhouse
gas
(GHG)
emissions,
including
carbon
dioxide
(CO2),
methane
(CH4),
nitrous
oxide
(N2O).
This
review
synthesizes
recent
studies
from
2019
2024,
revealing
the
complex
mechanisms
through
which
microplastics
influence
GHG
production.
These
include
adsorption
of
nutrients
pollutants
onto
microplastic
surfaces
their
role
substrates
for
microbial
colonization.
The
impacts
vary
significantly
across
different
environments,
such
agricultural
soils
marine
sediments.
underscores
urgent
need
standardized
methodologies
long-term
field
accurately
assess
ecological
consequences
microplastics.
Notably,
(N2O),
a
potent
with
global
warming
potential
nearly
300
times
that
CO2,
remains
underexplored
context
interactions,
highlighting
critical
research
gap.
Additionally,
synergistic
effects
other
require
further
investigation
fully
understand
cumulative
impact
on
emissions.
calls
coordinated
effort
among
researchers
policymakers
advance
our
understanding
microplastics'
budgets
develop
effective
strategies
mitigating
environmental
climatic
impacts.
Язык: Английский