Ecotoxicology and Environmental Safety,
Год журнала:
2024,
Номер
287, С. 117298 - 117298
Опубликована: Ноя. 1, 2024
As
the
key
interface,
nitrate
removal
capacity
of
riparian
zones
is
receiving
close
attention.
Although
naturally
occurring
organic
compounds
in
this
environment
play
a
pivotal
role
shaping
microbial
communities
and
influencing
capacity,
relevant
research
inadequate.
Given
complexity
environments,
study,
we
added
representative
natural
matter
(fulvic
acid,
butyric
naphthalene,
starch,
sodium
bicarbonate)
as
carbon
conditions
incorporated
magnetite
to
simulate
zone
components.
The
study
investigated
degradation
efficiency
responses
under
different
real
iron-containing
environments.
Butyric
acid
exhibited
most
efficient
reduction,
followed
descending
order
by
bicarbonate,
humic
acid.
However,
did
not
imply
that
efficiently
removed
nitrogen;
instead,
nitrogen
would
circulate
form
ammonium.
Denitrification
DNRA
were
primary
drivers
reduction
each
system,
while
naphthalene
systems
also
nitrification
mineralization.
Nitrogen-fixing
bacteria
represent
unique
community
butyrate
system.
Further,
synergistic
demonstrated
significant
potential
applications.
High-throughput
sequencing
revealed
exerted
selective
pressure
on
microorganisms,
driving
Fe
(Ⅱ)/Fe
(Ⅲ)
transformation
structure
cycling
process.
Ecotoxicology and Environmental Safety,
Год журнала:
2024,
Номер
274, С. 116237 - 116237
Опубликована: Март 18, 2024
Dissolved
organic
matter
(DOM)
is
a
crucial
component
of
natural
sediments
that
alters
Cd
sequestration.
Nevertheless,
how
different
types
DOM
fuel
mobilization
in
Mn-rich
has
not
been
elucidated.
In
the
present
study,
four
typical
DOM,
fluvic
acid
(FA),
bovine
serum
albumin
(BSA),
sodium
alginate
(SA),
and
dodecyl
benzene
sulfonate
(SDBS),
were
used
to
amend
Cd-contaminated
sediment
study
their
effects
on
Cd/Mn
biotransformation
microbial
community
response.
The
results
demonstrated
drive
shifts
enhance
microbially
mediated
Mn
oxide
(MnO)
reduction
release.
amendment
terrestrial-
anthropogenic-derived
(FA
SDBS)
mainly
contributed
enriching
Mn-reducing
bacteria
phylum
Proteobacteria,
its
abundance
increased
by
38.16-74.47
%
56.41-73.98
%,
respectively.
Meanwhile,
microbial-derived
(BSA
SA)
stimulated
abundances
metal(loid)-resistant
Firmicutes.
Accompanied
structure,
diversity,
co-occurrence
network
shifts,
concentration
oxidation-reduction
potential
changed,
resulting
enhanced
mobilization.
Importantly,
FA
release
most
remarkably,
probably
because
decreased
cooperative
interactions
between
bacterial
populations,
stronger
MnOs,
higher
aromaticity
hydrophobicity
after
amendment.
This
linked
functional
communities,
explored
roles
lake
sediments.
