Environmental Pollutants and Bioavailability,
Journal Year:
2023,
Volume and Issue:
35(1)
Published: Oct. 20, 2023
This
study
aimed
to
investigate
the
effects
of
fresh
water
and
seawater
flooding
on
phosphorous
(P)
nitrogen
(N)
dynamics
in
two
calcareous
soils
(Biscayne
Krome)
South
Florida
using
a
28-day
greenhouse
experiment.
Porewater
samples
were
collected
at
three
depths
over
four
periods
(1,
7,
14,
28
days)
analyzed
for
selected
quality
parameters.
Results
showed
that
seawater-flooded
Biscayne
soil
had
4.4
fold
higher
porewater
soluble
reactive
phosphorus
(SRP)
concentration
than
freshwater.
Additionally,
SRP
total
(TP)
increased
with
prolonged
duration
column
depth.
Furthermore,
both
freshwater
NH4+
-
N
concentration;
however,
increase
was
more
pronounced
flooded
samples.
also
duration.
Overall,
highlights
risks
nutrient
leaching
from
coastal
could
contribute
deterioration
surface
groundwater
quality.
Research Square (Research Square),
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 10, 2025
Abstract
This
study
investigates
the
performance
of
a
hydrogen-based
membrane
biofilm
reactor
(MBfR)
for
nitrogen
transformation
over
an
extended
operational
period
exceeding
200
days.
During
monitoring,
sustained
highly
alkaline
conditions
with
pH
consistently
11.20,
while
achieving
ammonia
conversion
efficiency
above
60%
and
maintaining
nitrite
accumulation
rate
below
1%.
Integrated
mass
balance
calculations
microbial
community
profiling
revealed
coexistence
denitrification
dissimilatory
nitrate
reduction
to
ammonium
(DNRA)
pathways
within
network.
A
factorial
experimental
design
was
implemented
hydraulic
retention
time
(HRT)
influent
concentration
as
independent
variables,
generating
nine
distinct
regimes
through
cross-variable
permutations.
Subsequent
analysis
extensive
datasets
enabled
development
Response
Surface
Methodology
(RSM)
model
simulate
dynamics.
Model
validation
confirmed
statistical
reliability
predictive
accuracy
RSM
framework.
Critical
demonstrated
that
in
hydrogen
autotrophic
system
exhibited
significant
correlation
individual
variables
themselves
but
showed
negligible
dependence
on
their
interactive
effects.
These
findings
provide
novel
insights
into
process
optimization
strategies
theoretical
understanding
convention.
npj Clean Water,
Journal Year:
2024,
Volume and Issue:
7(1)
Published: July 11, 2024
Abstract
Dissimilatory
nitrate
reduction
to
ammonium
(DNRA)
received
more
attention
for
its
ability
recover
ammonium.
This
study
investigated
the
possibility
of
low-frequency
infrared
electromagnetic
field
(IR-EMF)
improve
DNRA.
The
optimal
IR-EMF
intensity
0.04
μT
could
effectively
DNRA
activity
nonwoven
fabric
membrane
bioreactors.
In
long-term
operation,
average
conversion
efficiency
was
enhanced
by
117.7%
and
62.5%
under
0.06
IR-EMF,
respectively.
highest
nrfA-gene
abundance
potential
rate
were
obtained
exposure.
Bacteroidetes
fragilis
,
Shewanelle
oneidensis
MR-1
Thauera
sp.
RT1901
selected
investigate
dynamic
response
nitrogen
transformation
energy
metabolism
IR-EMF.
transcriptome
sequencing
RT-qPCR
results
suggested
that
enhance
both
denitrification
process,
mainly
improving
ATP
synthesis
boost
metabolic
activity.
provided
an
efficient
method
recovery
via
process
applying
