Chemosphere,
Год журнала:
2024,
Номер
363, С. 142815 - 142815
Опубликована: Июль 8, 2024
Continuous
nitrate
treatment
is
an
innovative,
nature-based
and
cost-effective
restoration
method
that
has
been
implemented
in
a
small,
hypereutrophic
lake
by
redirecting
the
nitrate-rich
waters
of
lake's
natural
tributaries
into
its
hypolimnion.
The
aim
this
to
increase
redox
potential
at
sediment-water
interface
order
provide
conditions
for
efficient
phosphorus
binding.
To
assess
effects
treatment,
studies
physico-chemical
biological
parameters
were
carried
out
before
application
(PreNT
-
years
2005-2007),
during
(FullNT
2008-July
2019),
period
when
installation
was
partly
clogged
(LimNT-
August
2019-2021).
results
show
effective
improvement
oxygenation
hypolimnion
followed
decrease
concentration
proxy
reduced
internal
loading.
Water
quality
gradually
improved
treatment.
periods
cyanobacterial
blooms
shortened
some
years,
ceased
other
it
also
manifested
range
Secchi
depth
chlorophyll-a
concentration.
share
eukaryotic
algae
phytoplankton
increased.
showed
high
resistance
disturbances
functioning,
because
two
operation
one
pipeline,
only
slight
deterioration
water
observed.
This
enables
repair
hypolimnion's
supply
nitrates,
without
sudden
return
pre-restoration
state.
Finally,
benefits
limitations
hypolimnetic
(with
from
sources)
discussed
facilitate
lakes.
Abstract
Using
data
on
23
Danish
lakes,
we
conducted
mass
balances
to
develop
total
nitrogen
(TN)
models
for
predicting
annual
mean
TN
in
lakes
based
external
loading
and
found
high
predictability
when
including
lake
hydraulic
retention
time
depth
the
model.
We
further
used
a
unique
30-year
balance
series
from
10
with
contrasting
depths
times
elucidate
effect
of
reduction
N
legacy
TN.
that
percentage
during
30
years
was
generally
not
sensitive
an
often
major
loading;
it
overall
followed
pattern
above
model
predictions,
suggesting
low
effect.
Moreover,
affected
by
changes
TP.
Our
results,
therefore,
show
fast
response
reduction,
indicating
can
expect
immediate
water
quality
shallow
suffering
internal
phosphorus
re-oligotrophication
provided
inorganic
is
enough
become
growth-limiting
nutrient.
ACS ES&T Water,
Год журнала:
2024,
Номер
4(5), С. 2247 - 2258
Опубликована: Апрель 10, 2024
The
escalating
environmental
impact
of
rare
earth
elements
(REEs)
in
freshwater
ecosystems,
exemplified
by
Hongze
Lake's
increasing
pollution
levels
from
sediment-bound
nutrients
and
REEs
due
to
human
activities,
necessitates
a
comprehensive
study.
Our
objectives
are
unravel
the
spatial
distribution
patterns
surface
sediments
assess
their
combined
toxicity
effects
on
aquatic
biota,
aiming
fill
critical
gap
understanding
ecological
toxicological
risks
associated
with
these
contaminants.
This
study
employed
diffusive
gradients
thin
films
(DGT)
technique
analyze
China's
Lake
for
REEs.
Significant
fluctuations
were
observed
concentrations
phosphate
(PO4–P),
nitrate
(NO3–N),
ammonium
(NH4–N),
some
exceeding
predicted
no
effect
(PNEC)
organisms.
Correlation
analysis
suggested
complex
interrelationships
among
elements,
indicating
potential
common
sources.
Factor
condensed
16
variables
into
4
factors,
unveiling
distinct
lake.
Additionally,
probabilistic
ecotoxicological
risk
assessment,
integrating
DGT-labile
data,
revealed
1.26%
probability
inducing
toxic
biota.
These
findings
provide
specific
numerical
insights
sources
within
ecosystem.
results
offer
valuable
information
current
future
lake
management
conservation
efforts.
Water Research,
Год журнала:
2024,
Номер
263, С. 122193 - 122193
Опубликована: Июль 30, 2024
Controlling
lake
eutrophication
is
a
challenge.
A
case-specific
diagnostics
driven
approach
recommended
that
will
guide
to
suite
of
measures
most
promising
in
restoration
eutrophic
lakes
as
exemplified
by
the
case
shallow
Groote
Melanen,
The
Netherlands.
system
analysis
identified
external
and
internal
nutrient
load
main
reasons
for
poor
water
quality
reoccurring
cyanobacterial
blooms
lake.
Based
on
this
analysis,
package
was
implemented
between
January
2015
May
2016.
These
included
fish
removal,
dredging,
capping
peat
rich
sediment
with
sand
an
active
barrier
(lanthanum-modified
bentonite),
diversion
two
inlet
streams,
reconstruction
banks,
planting
macrophytes.
Dredging
caused
temporarily
elevated
turbidity
suspended
solids
concentrations,
while
addition
lanthanum-modified
clay
temporary
exceedance
Dutch
La
standard
freshwaters.
Diversion
inflow
streams
35
%
less
larger
level
fluctuations,
but
remained
transporting
strongly
improved
revealed
comparing
five
years
pre-intervention
data
years'
post-intervention
data.
Total
phosphorus
concentration
column
reduced
93
from
0.47
mg
P
l-1
before
intervention
0.03
after
intervention,
total
nitrogen
66
1.27
0.21
N
l-1,
chlorophyll-a
75
68
16
µg
cyanobacteria
88
32
4
l-1.
Turbidity
had
declined
58
23.5
FTU
average
9.9
FTU.
No
were
recorded
over
entire
monitoring
period
(2016–2021).
Submerged
macrophytes
increased
complete
absence
around
10
%–15
coverage
intervention.
Repeated
removal
lowered
stock
below
100
kg
ha-1
12
bream
carp
remaining.
Hence,
cohesive
based
thorough
diagnosis
resulted
rapidly,
enduringly
quality.
This
provides
evidence
power
combining
restoring
lakes.
Current
management
of
eutrophic
lakes
primarily
targets
nutrient
reduction
and
algal
bloom
control,
often
overlooking
the
organismal
mechanisms
that
drive
changes
in
community
stability
across
multitrophic
levels.
This
study
employed
environmental
DNA
(eDNA)
to
examine
seasonal
dynamics
communities
typical
shallow
Dianchi
(plateau)
Taihu
(plain),
exploring
how
eutrophication
stress
influences
composition,
networks,
stability.
We
found
plateau
plain
had
their
respective
dominant
taxa
diversity
seasons.
The
structure
networks
composed
varied
significantly
seasons,
among
which
Lake
exhibited
17.9%
higher
connectivity
8.2%
greater
robustness
compared
Lake.
Dominant
played
a
critical
role
determining
through
different
pathways;
30%
variation
was
attributed
bottom-up
effects,
with
algae
as
core
pathway,
while
40%
mainly
explained
by
top-down
fish
pathway.
These
findings
underscore
lake-specific
changes,
providing
insights
into
tailored
strategies
for
based
on
unique
ecological
processes.
Energies,
Год журнала:
2025,
Номер
18(4), С. 816 - 816
Опубликована: Фев. 10, 2025
The
protection
and
reclamation
of
surface
waters,
particularly
lakes,
necessitates
the
implementation
novel
approaches
that
effectively
integrate
natural
biological
processes
with
sophisticated
technological
solutions.
This
paper
examines
potential
bioremediation
techniques
utilising
artificial
aeration
systems,
renewable
energy
sources
serving
as
a
viable
power
source.
objective
analysis
is
to
enhance
sustainability
remediation
aquatic
ecosystems.
A
multi-criteria
(MCA)
was
employed
evaluate
performance
environmental
impact
selected
methods.
Based
on
results
MCA,
SHPP
(small
hydro
plant)
technology
achieved
highest
score
for
both
0.85
0.78,
respectively,
making
it
optimal
technology.
In
comparison,
wind
scored
around
0.5
photovoltaic
(PV)
0.6,
showing
poorer
fit
local
conditions.
By
integrating
applications,
this
research
presents
strategy
developing
more
resilient
environmentally
sound
water
management
strategies.
