Applied Sciences,
Journal Year:
2024,
Volume and Issue:
14(21), P. 9804 - 9804
Published: Oct. 27, 2024
Groundwater
resource
is
crucial
for
the
development
of
agriculture
and
urban
communities
in
valley
basins
arid
semiarid
regions.
This
research
investigated
groundwater
chemistry
a
typical
urbanized
basin
on
Tibetan
Plateau
to
understand
hydrochemical
status,
quality,
controlling
mechanisms
basins.
The
results
show
predominantly
fresh
slightly
alkaline
across
basin,
with
approximately
54.17%
HCO3-Ca
type.
About
12.5%
33.33%
sampled
groundwaters
are
facies
Cl-Mg·Ca
type
Cl-Na
type,
respectively.
found
maximum
TDS,
NO3−,
NO2−,
F−
content
3066
mg/L,
69.33
0.04
3.12
quality
suitable
domestic
usage
at
all
sampling
sites
based
EWQI
assessment
but
should
avoid
direct
drinking
some
sporadic
area.
exceeding
nitrogen
fluoride
contaminants
would
pose
potential
health
hazards
local
residents,
high
risks
only
existed
infants.
Both
minors
adults
medium
risk
these
exceedingly
toxic
contaminants.
predominant
long-term
irrigation
according
single
indicator
EC,
SAR,
%Na,
RSC,
KR,
PI,
PS
integrated
USSL,
Wilcox,
Doneen
diagram
assessment.
But
sodium
hazard,
alkalinity
permeability
problem
be
concern
middle-lower
stream
areas.
governed
by
water-rock
interaction
(silicate
dissolution)
natural
sporadically
evaporation.
Human
activities
have
posed
disturbances
inputted
nitrogen,
fluoride,
salinity
into
groundwater.
elevated
from
both
agricultural
municipal
sewage.
While
associated
It
imperative
address
anthropogenic
safeguard
resources
adverse
external
impacts
human
settlements
within
Environmental Science and Pollution Research,
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 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.
Frontiers in Bioengineering and Biotechnology,
Journal Year:
2025,
Volume and Issue:
13
Published: Jan. 22, 2025
Nitrate,
a
major
groundwater
pollutant
from
anthropogenic
activities,
poses
serious
health
risks
when
present
in
drinking
water.
Denitrification
using
bio-electrochemical
reactors
(BER)
offers
an
innovative
technology,
eco-friendly
solution
for
nitrate
removal
groundwater.
BER
use
electroactive
bacteria
to
reduce
inorganic
compounds
like
and
bicarbonate
by
transferring
electrons
directly
the
cathode.
In
our
work,
two
batch
were
implemented
at
1V
2V,
anaerobic
digestate
full-scale
wastewater
treatment
plant
as
inoculum.
nitrite,
sulfate,
total
ammoniacal
nitrogen,
16S
rRNA
analysis
of
bacterial
community,
monitored
during
operation.
The
results
showed
effective
all
BERs,
with
denitrification
rate
2V
higher
than
Control
system,
where
endogenous
respiration
drove
process.
At
1V,
complete
conversion
N
2
occurred
4
days,
while
it
took
14
days.
slower
was
likely
due
O
production
water
electrolysis,
which
competed
final
electron
acceptor.
Bacterial
community
confirmed
selection
genus
Desulfosporosinus
Leptolinea
,
confirming
transfer
without
biofilm.
Besides,
Hydrogenophaga
enhanced
electrolytically
produced
H
.
Sulfate
not
reduced,
nitrogen
remained
constant
indicating
no
dissimilatory
nitrite
reduction
ammonia.
These
provide
significant
contribution
scaling
up
electro-assisted
autotrophic
its
application
remediation,
utilizing
simple
reactor
configuration-a
single-chamber,
membrane-free
design-
conventional
power
source
instead
potentiostat.
Scientific Reports,
Journal Year:
2024,
Volume and Issue:
14(1)
Published: June 20, 2024
Abstract
Pharmaceutical
pollutants,
a
group
of
emerging
contaminants,
have
attracted
outstanding
attention
in
recent
years,
and
their
removal
from
aquatic
environments
has
been
addressed.
In
the
current
study,
new
sponge-based
moving
bed
biofilm
reactor
(MBBR)
was
developed
to
remove
chemical
oxygen
demand
(COD)
pharmaceutical
compound
Ibuprofen
(IBU).
A
30-L
pilot
scale
MBBR
constructed,
which
continuously
fed
effluent
first
clarifier
Southern
Tehran
wastewater
treatment
plant.
The
controlled
operational
parameters
were
pH
natural
range,
Dissolved
Oxygen
1.5–2
mg/L,
average
suspended
mixed
liquor
solids
(MLSS),
volatile
(MLVSS)
1.68
±
0.1
g/L
1.48
g/L,
respectively.
effect
hydraulic
retention
time
(HRT)
(5
h,
10
15
h),
filling
ratio
(10%,
20%,
30%),
initial
IBU
concentration
(2
5
mg/L)
on
efficiencies
assessed.
findings
this
study
revealed
COD
efficiency
ranging
48.9
96.7%,
with
best
observed
at
an
HRT
2
mg/L.
Simultaneously,
rate
ranged
25
92.7%,
highest
under
same
ratio,
albeit
An
extension
h
significantly
improved
both
removal.
However,
further
slightly
enhanced
IBU,
even
some
cases,
decreased.
Based
obtained
results,
20%
chosen
as
optimum
state.
Increasing
mg/L
generally
removal,
whereas
increase
caused
decline
This
also
optimized
reactor’s
for
by
using
response
surface
methodology
(RSM)
independent
variables
HRT,
concentration.
regard,
quadratic
model
found
be
significant.
Utilizing
central
composite
design
(CCD),
optimal
operating
21%,
3
pinpointed,
achieving
efficiencies.
present
demonstrated
that
stands
out
promising
technology
