Sustainability,
Journal Year:
2023,
Volume and Issue:
15(19), P. 14332 - 14332
Published: Sept. 28, 2023
A
large
number
of
microplastics
(MPs)
have
been
found
in
various
stages
wastewater
treatment
plants,
which
may
affect
the
functional
microbial
activity
activated
sludge
and
lead
to
unstable
pollutant
removal
performance.
In
this
study,
effects
different
concentrations
polylactic
acid
(PLA
MPs)
on
system
performance,
nitrification
phosphorus
(P)
activities,
extracellular
polymeric
substances
(EPS)
were
evaluated.
The
results
showed
that
under
same
influent
conditions,
low
(50
particles/(g
TS))
PLA
MPs
had
no
significant
effect
effluent
quality.
average
efficiencies
chemical
oxygen
demand,
phosphate,
ammonia
all
above
80%,
total
nitrogen
remained
70%.
High
(200
inhibited
activities
polyphosphate-accumulating
organisms
(PAOs)
nitrifying
bacteria.
specific
anaerobic
P
release
rate
decreased
from
37.7
23.1
mg
P/(g
VSS·h),
aerobic
uptake
also
significantly
decreased.
oxidation
0.67
0.34
N/(g
while
change
nitrite
was
not
significant.
dosing
EPS
humic
content.
As
concentration
increased,
community
diversity
increased.
relative
abundance
potential
PAOs
(i.e.,
Acinetobacter)
increased
0.08
12.57%,
glycogen-accumulating
Competibacter
Defluviicoccus)
changes,
would
improved
denitrifying
bacteria
Pseudomonas)
95.43
58.98%,
potentially
contributing
decline
denitrification
Water Science & Technology,
Journal Year:
2025,
Volume and Issue:
91(5), P. 626 - 638
Published: March 1, 2025
ABSTRACT
Nanoplastics,
commonly
used
in
cosmetics,
enter
wastewater
systems
and
interact
with
activated
sludge,
yet
their
effects
on
microorganisms,
essential
for
treatment,
remain
poorly
understood.
The
aim
of
this
study
was
to
investigate
the
polyacrylic
acid-based
nanoplastics
(PANPs)
microorganisms
sludge.
PANPs
were
characterized
terms
material
composition,
size,
zeta
potential,
additive
content.
Acute
(30
min)
prolonged
(up
6
h)
toxicity
tests
performed
evaluate
negative
heterotrophic
nitrifying
In
addition,
ready
inherent
biodegradability
assess
degradation
environment
within
treatment
plants,
respectively.
results
showed
a
significant
acute
inhibition
activity
55
72%,
respectively)
at
highest
concentration
tested
(100
mg/L,
30
min),
primarily
attributed
presence
1-dodecanol
detected
PANPs.
This
effect
decreased
exposure,
likely
due
volatilization
1-dodecanol.
Nevertheless,
found
be
non-biodegradable
both
tests.
Although
do
not
appear
pose
long-term
threat
persistence
raises
concerns
about
possible
accumulation.
