Minerals,
Journal Year:
2024,
Volume and Issue:
14(12), P. 1210 - 1210
Published: Nov. 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.
Research Square (Research Square),
Journal Year:
2024,
Volume and Issue:
unknown
Published: March 15, 2024
Abstract
Purpose
Long-term
weathering
promotes
the
development
of
microbial
communities
and
increased
diversity
in
bauxite
residue.
However,
effect
different
vegetation
cover
on
stability
community
are
still
poorly
understood.
Methods
In
this
study,
residue
samples
from
three
typical
including
Artemisia
(BA),
Cynodon
(BC),
Hedysarum
(BH)
were
collected
a
deposit
area.
Illumina
high-throughput
sequencing
technology
was
applied
to
determine
Results
Residues
vegetated
sites
exhibited
lower
alkalinity
higher
nutrients
level,
as
well
biomass
activities,
suggesting
that
plant
encroachment
significantly
multifunctionality
addition,
also
induced
enhanced
network
stability.
Furthermore,
our
results
showed
positive
correlated
with
promoted
functional
bacterial
assemblages
(mostly
Rhizobiaceae,
Blastocatellaceae,
Acidobacteriaceae,
Sphingonmonadaceae,
Frankiaceae),
which
core
species
network.
Conclusions
Plant
could
increase
stability,
thus
promote
elevation
Frankiaceae
played
important
roles
promotion
Our
highlight
necessity
conserving
augmenting
abundance
ensure
stable
provision
ecosystem
functions
disposal
areas.
Minerals,
Journal Year:
2024,
Volume and Issue:
14(12), P. 1210 - 1210
Published: Nov. 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.
