Sustainability,
Journal Year:
2023,
Volume and Issue:
15(22), P. 15765 - 15765
Published: Nov. 9, 2023
The
effects
of
nitrogen
sources
on
the
biosynthesis
jarosite
were
investigated
by
analyzing
changes
in
pH,
Fe2+,
total
Fe
(TFe),
and
production
a
9K
culture
medium
containing
different
sources.
Three
sources,
namely
(NH4)2SO4,
carbamide
(CO(NH2)2),
NH4NO3,
used
this
study.
solution’s
pH
Fe2+
concentrations
set
to
2.5
160
mmol/L,
respectively.
results
demonstrated
that
three
could
be
Acidithiobacillus
ferrooxidans
(A.
ferrooxidans)
LX5,
but
degree
utilization
differed.
addition
(NH4)2SO4
facilitated
growth
A.
LX5
compared
with
other
two
while
bacterial
activity
CO(NH2)2
was
minimum.
solution
had
an
inverse
correlation
activity.
mineralization
rate
using
as
source
42.48%,
which
slightly
higher
than
rates
obtained
NH4NO3
(31.67%
35.35%,
respectively).
resulting
minerals
showed
appearance
chemical
composition.
However,
XRD
spectra
similar
structure.
jarosites
identified
mixture
jarosite,
ammonioiarosite,
carphosiderite.
Water Science & Technology,
Journal Year:
2024,
Volume and Issue:
89(2), P. 470 - 483
Published: Jan. 2, 2024
Abstract
After
the
closure
of
Yudong
coal
mine,
pH
value
was
approximately
3.0,
and
Fe
Mn
concentrations
reached
380
69
mg/L,
respectively,
in
acid
mine
drainage
(AMD),
causing
serious
pollution
to
water
bodies
nearby
watershed.
Combined
with
formation
conditions
AMD,
comprehensive
treatment
technology
source
reduction–end
is
adopted
treat
AMD.
The
area
goaf
0.3
km3,
filling
grouting
volume
about
6.7
m3,
curtain
4,000
m3.
Through
sealing
goaf,
reduced
less
than
85%
initial
(100
m3/h).
end
treatment,
effluent
around
7.0,
content
0.1
removal
rate
above
99%.
project
subsequently
operated
at
RMB
0.85
yuan/t.
This
aimed
AMD
from
small
mines
complex
terrain
conditions.
It
has
characteristics
low
cost
high
efficiency
can
provide
an
effective
for
southwestern
China
areas
same
geological
Sustainability,
Journal Year:
2024,
Volume and Issue:
16(16), P. 7208 - 7208
Published: Aug. 22, 2024
The
acid
pollution
produced
from
coal
gangue
piles
is
a
global
environmental
problem.
Terminal
technologies,
such
as
neutralization,
precipitation,
adsorption,
ion
exchange,
membrane
technology,
biological
treatment,
and
electrochemistry,
have
been
developed
for
mine
drainage
(AMD)
treatment.
These
technologies
treating
pollutants
with
low
concentrations
over
long
period
of
time
in
appear
to
be
costly
unsustainable.
Conversely,
situ
remediation
appears
more
cost-effective
material-efficient,
but
it
challenge
that
producing
countries
need
solve
urgently.
primary
prerequisite
preventing
acidic
clarify
the
oxidation
mechanisms
gangue,
which
can
summarized
four
aspects:
pyrite
oxidation,
microbial
action,
low-temperature
coal,
free
radical
action.
two
key
factors
are
necessary
conditions
water,
oxygen,
microorganisms,
radicals.
current
mainly
focus
on
one
or
conditions,
forming
mixed
co-disposal,
coverage
barriers,
passivation
coatings,
bactericides,
inhibitors,
plants,
so
on.
It
scientifically
systematically
carry
out
coupled
various
based
when
carrying
large-scale
restoration
treatment
piles.
