Minerals,
Год журнала:
2024,
Номер
14(12), С. 1210 - 1210
Опубликована: Ноя. 27, 2024
The
global
generation
of
bauxite
residue
necessitates
environmentally
responsible
disposal
strategies.
This
study
investigated
the
long-term
(5-year)
behavior
whose
pH
was
lowered
to
8.5,
called
modified
(MBR),
using
lysimeters
test
various
configurations:
raw
MBR
or
used
(UMBR)
previously
applied
for
acid
mine
drainage
remediation,
sand
soil
capping,
and
revegetation.
Throughout
experiment
across
all
configurations,
leachates
stabilized
between
7
8
their
salinity
decreased.
Their
low
sodium
absorption
ratio
(SAR)
indicated
minimal
risk
material
clogging
suitability
salt-tolerant
plant
growth.
Leaching
potentially
toxic
elements,
except
vanadium,
decreased
rapidly
after
first
year
levels.
Leachate
concentrations
consistently
remained
below
LD50
Hyalella
azteca
were
at
least
an
order
magnitude
lower
by
experiment’s
end,
first-year
chromium.
Sand
capping
performed
poorly,
while
revegetation
slightly
increased
leaching,
though
these
negligible
given
final
leaching
Revegetated
shows
promise
as
a
suitable
sustainable
solution
managing
residues,
provided
is
maintained
above
6.5.
highlights
importance
assessments
appropriate
management
strategies
disposal.
Frontiers in Plant Science,
Год журнала:
2025,
Номер
16
Опубликована: Апрель 28, 2025
Riparian
zones
maintain
biodiversity,
cyclic
nutrients,
and
regulate
water
quality.
However,
their
stability
is
increasingly
threatened
by
human
activities
such
as
dam
construction
climate
variability.
This
study
focuses
on
the
riparian
of
Three
Gorges
Dam
Reservoir
(TGDR),
a
region
marked
fluctuating
levels
subtropical
southeast
monsoon
climate.
We
investigated
seasonal
vegetation-specific
dynamics
soil
properties
microbial
communities
in
dominated
artificially
remediated
plants
(ARPs)
TGDR.
The
selected
ARP
species
included
herbaceous
Cynodon
dactylon
(CD)
Hemarthria
altissima
(HA),
known
for
capacity
rapid
stabilization,
tree
Salix
matsudana
(SM)
Taxodium
distichum
(TD),
which
enhance
nutrient
cycling
through
litter
inputs
root
exudates.
These
were
evaluated
across
spring
(T1),
summer
(T2),
autumn
(T3).
Our
analysis
360
samples
led
to
generation
high-quality
sequences
that
provided
insights
into
diversity.
Principal
component
identified
organic
matter,
ammonium
nitrogen,
total
nitrogen
main
contributors
property
variance,
explaining
53.68%
T1,
51.52%
T2,
56.37%
T3
variance
(p
<
0.01).
Correlation
highlighted
positive
relationship
between
pH
Nitrospirae
(r
=
0.603)
Proteobacteria
0.558).
Enzyme
activity
varied
season,
with
acid
phosphatase
peaking
invertase
highest
T1.
also
made
functional
predictions
pathways
pertinent
metabolism,
genetic
information
processing,
environmental
signal
transduction.
There
shifts
metabolic
pathways,
an
increase
carbohydrate
metabolism
via
TD.
In
addition,
there
was
rise
amino
CD.
assessment
diversity
uncovered
68
bacterial
phyla,
Acidobacteria
emerging
dominant
taxa.
results
indicate
ARPs
positively
influence
health,
cycling,
overall
ecosystem
integrity.
findings
hold
significant
implications
restoration
regions
experiencing
changes.
ACS ES&T Engineering,
Год журнала:
2023,
Номер
3(11), С. 1758 - 1769
Опубликована: Авг. 1, 2023
Microbially
driven
aggregate
formation
plays
a
sustainable
role
during
the
soil
process
in
bauxite
residue,
which
may
realize
large-scale
treatment
of
typical
alkaline
solid
waste.
However,
potential
mechanisms
microbial
metabolites
on
organic–alkaline
mineral
complexes
and
stable
aggregates
are
usually
neglected.
Here,
we
developed
novel
microbially
strategy
to
improve
enhance
ecological
service
resilience
by
inoculation
Penicillium
oxalicum
(P.
oxalicum,
an
alkali-tolerant
acid-producing
fungi).
The
intensive
application
P.
reduced
contents
electrical
conductivity
(EC)
exchangeable
sodium
percentage
(ESP)
while
increasing
proportions
macroaggregates
microaggregates
residue
compared
chemical
amendments.
Furthermore,
even
inoculated
with
same
dose
multiple
inoculations
achieved
higher
extracellular
metabolic
activity
than
single
inoculation.
Simultaneously,
guided
oligotrophic-dominated
assemblages
(including
Actinobacteria,
Proteobacteria,
Ascomycota
members)
increased
network
complexity.
spectroscopic
analysis
demonstrated
that
polymeric
substances
(EPSs)
promoted
due
high
adsorptive
functional
groups
(e.g.,
−OH,
−COOH,
N–H).
existence
hydrogen
bonds
led
viscosity
exhibition
through
binding
effects
polysaccharides
minerals
sodalite,
cancrinite).
findings
enhanced
understanding
EPSs
stabilization
rehabilitation
residue.
ACS Sustainable Chemistry & Engineering,
Год журнала:
2024,
Номер
unknown
Опубликована: Ноя. 20, 2024
Recycling
of
red
mud
(RM)
has
posed
an
enduring
challenge
for
the
alumina
industry.
This
work
offers
a
comprehensive
investigation
into
fundamental
and
applied
research
RM
blend
iron
ore
sintering
process.
Microsintering
test
was
employed
to
investigate
formation
properties
bonding
phase
affected
by
RM.
It
resulted
in
impairment
infiltration
onto
surface
decrease
interfacial
strength.
The
interaction
mechanism
showed
that
excessive
TiO2
Al2O3
brought
leads
transformation
calcium
ferrite
(the
target
phase)
perovskite
spinel
with
high
melting
points,
resulting
evolution
from
original
dense
strip-crystallized
structure
fine-grained
porous.
Incorporation
CaO
conjunction
facilitates
within
enhances
its
on
surface,
thereby
augmenting
Pilot-scale
successfully
conducted
6%
1.5%
quicklime.
sinter
yield
76.68%
tumbling
index
64.98%
can
be
obtained,
which
were
comparable
those
achieved
without
RM,
offering
feasible
approach
large-scale
recycling
steel
Abstract
Aims
This
study
investigated
a
7
yr
old
rehabilitated
grassland
established
on
bauxite
residue
storage
areas(RSA)
in
order
to
assess
the
availability
and
ecosystem
transfer
of
both
nutrient
trace
elements,
determine
if
defined
rehabilitation
criteria
were
sustained.
Methods
Rehabilitated
residue/soil
was
sampled
over
depth
(0–10
10-20
cm)
season
(Spring/Summer
Autumn/Winter)
plant
growth
stage
(green
vs.
senescent)
essential
non-essential
element
(Ca,
Mg,
Na,
Al
V)
content.
Invertebrates
samples
from
decomposer
predator
specimens
assessed
foodchain
occurred.
Results
Residue-soil
results
showed
sustained
with
pH,
EC
ESP
all
within
recommended
levels.
Further,
bioavailable
fractions
V
remained
low.
Vegetation
analysis
revealed
seasonal
variation
for
elements
highlights
need
wider
monitoring
parameters.
Elemental
content
invertebrate
did
not
indicate
comparable
reference
site.
Conclusion
show
low
bioavailability
transfer.
