ACS ES&T Engineering,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Nov. 20, 2024
Feammox,
an
innovative
and
energy-efficient
biological
ammonium
removal
technology,
has
attracted
significant
attention
in
recent
years.
Defined
as
the
anaerobic
oxidation
coupled
with
Fe(III)
reduction,
Feammox
involves
Fe(III)-reducing
microbes
that
oxidize
to
nitrite
using
ferric
ions.
Identified
diverse
ecosystems,
such
freshwater,
marine,
natural
wetlands,
wastewater
plays
a
vital
role
global
nitrogen
cycle.
Numerous
studies
have
investigated
its
performance,
influencing
factors,
reaction
mechanisms,
engineering
applications.
However,
our
understanding
of
functional
microorganisms
key
genes
involved
remains
limited
controversial.
Clearly
identifying
characterizing
responsible
for
process
are
essential
practical
application
treatment.
Therefore,
this
review
critically
analyzes
summarizes
advances
research,
focus
on
microorganisms,
genes,
regulation
strategies.
Initially,
discusses
from
perspective
microbial
cooperation.
It
then
delves
into
enzymatic
genetic
mechanisms
well
critical
factors
affecting
activity.
Finally,
strategies
enhance
efficiency
systematically
outlined.
This
comprehensive
analysis
current
research
provides
clearer
more
complete
deepens
knowledge
establishes
solid
foundation
application.
ACS ES&T Engineering,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 14, 2025
Iron
materials
are
known
to
enhance
the
nitrogen
removal
efficiency
in
constructed
wetlands
(CWs)
by
coupling
iron
transformation
with
removal.
However,
current
research
lacks
detailed
explanations
of
microbial
processes
involved
utilizing
substrates,
such
as
transformation,
cellular
uptake,
and
metabolism,
leaving
a
gap
understanding
these
connections.
This
study
addresses
this
constructing
four
microcosm
CW
systems
using
Fe–C,
various
ratios
pyrite,
zerovalent
(ZVI)
substrates.
Experimental
results
indicated
that
was
most
thermodynamically
favorable
pyrite.
Microbial
communities
on
pyrite:
gravel
2:1
volume
ratio
(2P1G)
exhibited
greater
propensity
for
Feammox,
0.76%
increase
functional
network
Feammox
31.20%
abundance
nirA
gene
associated
process
compared
Fe–C
group.
Conversely,
group
less
favorable.
To
maintain
intracellular
homeostasis,
microorganisms
increased
siderophore
activity.
The
abundances
related
release
absorption
were
22.12%
17.26%
increased,
respectively,
2P1G.
employs
indicators
elucidate
link
between
transport
providing
insights
improving
CWs.
