In
this
study,
a
pyrite-based
autotrophic
denitrification
(PAD)
system,
polycaprolactone
(PCL)-supported
heterotrophic
(PHD)
and
pyrite/PCL-based
split-mixotrophic
(PPMD)
system
were
constructed.
The
pyrite
particle
size
was
controlled
in
1-3,
3-5,
or
5-8
mm
both
the
PAD
PPMD
systems
to
investigate
effect
of
on
performance
bioreactors.
results
showed
that
achieved
best
efficiency
with
an
average
removal
rate
98.98%
treatment
1-3
size,
whereas
it
only
19.24%
size.
At
different
phases
whole
experiment,
nitrate
rates
PHD
remained
stable
at
high
level
(>
94%).
Compared
reduced
concentrations
sulfate
chemical
oxygen
demand
final
effluent
efficiently.
Finally,
Spearman
correlation
analysis
used
construct
interconnection
network
diagram
between
water
quality
indicators,
found
explained
intrinsic
metabolic
pathways
nitrogen,
sulfur,
carbon
three
phases.
The Science of The Total Environment,
Journal Year:
2024,
Volume and Issue:
926, P. 172025 - 172025
Published: March 29, 2024
Adsorption,
which
is
a
quick
and
effective
method
for
phosphate
management,
can
effectively
address
the
crisis
of
phosphorus
mineral
resources
control
eutrophication.
Phosphate
management
systems
typically
use
iron-containing
nanominerals
(ICNs)
with
large
surface
areas
high
activity,
as
well
modified
ICNs
(mICNs).
This
paper
comprehensively
reviews
by
mICNs
in
different
water
environments.
have
higher
affinity
phosphates
than
ICNs.
adsorption
on
occurs
through
mechanisms
such
complexation,
precipitation,
electrostatic
ligand
exchange,
attraction.
Ionic
strength
influences
changing
potential
isoelectric
point
mICNs.
Anions
exhibit
inhibitory
effects
adsorption,
while
cations
display
promoting
effect.
More
importantly,
concentrations
molecular
weights
natural
organic
matter
inhibit
Sodium
hydroxide
has
regeneration
capability
Compared
to
crystallinity,
those
low
crystallinity
are
less
likely
desorb.
manage
municipal
wastewater,
eutrophic
seawater,
lakes.
Adsorption
saturated
be
used
fertilizers
agricultural
production.
Notably,
positive
negative
microorganisms
aquatic
organisms
soil.
Finally,
this
study
introduces
following:
trends
prospects
machine
learning-guided
mICN
design,
novel
methods
ICNs,
regeneration,
development
capacity
selectivity
phosphate,
investigation
competing
ions
environments
mICNs,
in-depth
research
mechanism
weakly
crystalline
ferrihydrite.
comprehensive
review
provide
insights
into
high-performance
future.
Environmental Science & Technology,
Journal Year:
2024,
Volume and Issue:
58(22), P. 9804 - 9814
Published: May 21, 2024
Autotrophic
denitrification
utilizing
iron
sulfides
as
electron
donors
has
been
well
studied,
but
the
occurrence
and
mechanism
of
abiotic
nitrate
(NO3–)
chemodenitrification
by
have
not
yet
thoroughly
investigated.
In
this
study,
NO3–
three
types
(FeS,
FeS2,
pyrrhotite)
at
pH
6.37
ambient
temperature
30
°C
was
FeS
chemically
reduced
to
ammonium
(NH4+),
with
a
high
reduction
efficiency
97.5%
NH4+
formation
selectivity
82.6%,
FeS2
pyrrhotite
did
reduce
abiotically.
Electrochemical
Tafel
characterization
confirmed
that
release
rate
from
higher
than
pyrrhotite.
Quenching
experiments
density
functional
theory
calculations
further
elucidated
heterogeneous
FeS.
Fe(II)
on
surface
primary
site
for
reduction.
possessing
sulfur
vacancies
can
selectively
adsorb
oxygen
atoms
water
molecules
promote
dissociation
form
adsorbed
hydrogen,
thereby
forming
NH4+.
Collectively,
these
findings
suggest
cannot
be
ignored,
which
great
implications
nitrogen,
sulfur,
cycles
in
soil
ecosystems.
