Environmental Science and Pollution Research,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 1, 2025
Abstract
Monitoring
changes
in
groundwater
quality
over
time
helps
identify
time-dependent
factors
influencing
water
safety
and
supports
the
development
of
effective
management
strategies.
This
study
investigates
spatiotemporal
evolution
chemistry
Debrecen
area,
Hungary,
from
2019
to
2024,
using
indexing,
machine
learning,
multivariate
statistical
techniques.
These
techniques
include
self-organizing
maps
(SOM),
hierarchical
cluster
analysis
(HCA),
principal
component
(PCA),
indexing
(GWQI).
The
hydrochemical
revealed
that
Ca-Mg-HCO₃
is
dominant
type,
with
a
temporal
shift
toward
Na-HCO₃,
reflecting
increased
salinity
driven
by
ongoing
rock-water
interactions.
SOM
showed
transition
heterogeneous
more
uniform
time,
suggesting
greater
stability
aquifer
system.
Elevated
zones
shifted
spatially
due
recharge
flow
patterns,
while
hardness
intensified
expanded,
indicating
continued
carbonate
dissolution.
HCA
highlighted
shifts
composition,
six
clusters
identified
five
gradual
homogenization
quality.
PCA
further
confirmed
this
trend,
linking
it
underlying
processes,
such
as
water–rock
interactions,
limited
contributions
anthropogenic
influences.
GWQI
indicated
general
improvement
most
regions
meeting
drinking
standards.
However,
specific
areas
exhibited
signs
localized
contamination,
requiring
targeted
management.
findings
underscore
importance
continuous
monitoring
detect
emerging
trends
guide
resource
highlights
need
for
sustainable
practices
safeguard
resources
ensure
long-term
security
area.
Heliyon,
Год журнала:
2025,
Номер
11(4), С. e42527 - e42527
Опубликована: Фев. 1, 2025
Taking
the
typical
phosphate
mining
area
in
Western
Hubei
as
research
object,
groundwater,
surface
water,
soil
and
sediment
were
investigated
evaluated
comprehensively
to
clarify
temporal
spatial
distribution
characteristics
of
different
forms
phosphorus
reveal
migration
transformation
phosphorus.
Results
showed
that
whether
dry
season
or
wet
season,
total
levels
groundwater
(dry
from
November
December
2021,
0.42
mg/L;
August
September
2022,
0.24
mg/L)
exceeded
standard
index.
The
was
related
seasonal
changes
rock.
Particulate
main
component
one
sources
water.
water
strongly
correlated
with
particulate
phosphorus,
correlation
coefficient
0.984.
exogenous
input.
had
a
certain
contribution
but
it
not
factor.
coefficients
between
0.349
0.346,
respectively.
content
closely
activities.
mainly
through
leaching,
scouring
mine
drainage
into
there
may
be
monitoring
wells.
poor.
high
source
groundwater.
Rainwater
scours
ore
yard
entrance,
resulting
loss
river,
indirectly
enter
Water Research,
Год журнала:
2024,
Номер
256, С. 121625 - 121625
Опубликована: Апрель 15, 2024
Hexavalent
chromium
(Cr(VI))
contamination
in
groundwater
poses
a
substantial
global
challenge
due
to
its
high
toxicity
and
extensive
industrial
applications.
While
the
bioelectroremediation
of
Cr(VI)
has
attracted
huge
attention
for
eco-friendly
attributes,
practical
application
remains
constrained
by
hydrogeochemical
conditions
(mainly
pH),
low
electron
transfer
efficiency,
limitations
electrocatalyst
synthesis
electrode
fabrication.
In
this
study,
we
developed
investigated
use
N,
S
co-doped
carbon
nanofibers
(CNFs)
integrated
on
graphite
felt
(GF)
as
self-standing
cathode
(NS/CNF-GF)
comprehensive
reduction
from
real
contaminated
groundwater.
The
binder
free
cathode,
prepared
through
electro-polymerization,
was
employed
dual-chamber
microbial
fuel
cell
(MFC)
treatment
Cr
(VI)-laden
(40
mg/L)
with
pH
7.4.
electrochemical
characterization
revealed
distinct
electroactive
surface
area,
more
wettability,
facilitating
enhanced
adsorption
rapid
transfer,
resulting
commendable
rate
0.83
mg/L/h.
MFC
equipped
NS/CNF-GF
demonstrated
lowest
charge
resistance
(Rct)
generated
highest
power
density
(155
±
0.3
mW/m2)
compared
control
systems.
favorable
electrokinetics
modified
led
swift
substrate
consumption
anode,
releasing
electrons
protons,
thereby
accelerating
achieve
cathodic
coulombic
efficiency
(C.Eca)
80
1.3%.
A
similar
temporal
trend
observed
between
removal
COD
C.Eca,
underscores
effective
performance
electrode.
reusability
exemption
catholyte
preparation
absence
regulation
requirements
highlighted
potential
scalability
applicability
our
findings
larger
scale.
