Polymers,
Год журнала:
2024,
Номер
16(19), С. 2703 - 2703
Опубликована: Сен. 25, 2024
The
aim
of
this
study
was
to
investigate
the
potential
upcycling
Expanded
Polystyrene
(EPS)
waste
collected
from
food
packaging
into
a
membrane
for
microalgae
harvesting,
in
which
filtration
often
challenges
fouling
and
pore
blocking.
target
species
is
Spirulina
platensis,
with
Chlorella
vulgaris
as
comparison
agent.
fabricated
used
Styrofoam,
typically
ends
up
single-use
waste.
In
study,
PVP
an
additive
at
varying
concentrations,
2
wt.%
8
wt.%.
experimental
results
indicated
that
despite
all
EPS
membranes
exhibited
near-complete
recovery
platensis
biomass
extraction.
Despite
similar
harvesting
efficiency,
EPS/PVP-8
largest
flux
970.5
LMH/Bar,
twice
value
pristine
membrane.
All
were
hydrophilic;
however,
hydrophobicity
increased
concentration.
SEM
micrographs
revealed
enlarged
surface
pores
improved
connectivity
within
membrane’s
structure,
ensuring
efficient
flow.
offers
promising
insights
sustainable
materials
wastewater
treatment.
flat
sheet
not
only
addresses
problem
Styrofoam
accumulation
but
also
paves
way
transform
valuable
products.
Chemical Engineering Journal Advances,
Год журнала:
2024,
Номер
18, С. 100594 - 100594
Опубликована: Фев. 15, 2024
The
study
investigated
the
use
of
zwitterion-grafted
polyethersulfone
(PES)
membranes
integrated
with
polyelectrolyte
coagulation
process
for
remediation
sewage
wastewater
after
physical
screening
stage
from
a
treatment
plant
(WWTP).
zwitterion
(sulfobetaine
methacrylate,
SBMA)
brushes
were
grafted
onto
PES
polymer
backbone
using
free
radical
polymerisation
in
aqueous
medium
to
improve
its
hydrophilic
properties
and
therefore
reverse
fouling
tendencies.
successful
synthesis
poly(sulfobetaine
methacrylate-grafted
(pSBMA-g-PES)
composite
was
confirmed
FTIR
TGA,
as
well
gravimetric
method.
resulting
composites
used
fabricate
zwitterion-containing
non-solvent
induced
phase
separation
(NIPS)
performance
parameters
fabricated
all
enhanced,
i.e.,
pure
water
flux,
resistance,
improved
quality
produce
water,
increased
mechanical
strength.
observed
resistance
increasing
content
demonstrating
role
delaying
or
inhibiting
foulant
adhesion.
treat
WWTP,
results
indicating
content.
In
order
further
reduce
increase
useful
lifespan
membranes,
pretreatment
sewerage
alum
filtration
process.
This
repeated
six
filtration-wash
cycles
demonstrate
reusability
profile.
qualities
evaluated
pH,
turbidity,
TDS,
TOC,
EC,
which
below
standards
required
reuse.
incorporation
zwitterions
resulted
membrane
hydrophilicity
surface
charge
modulation
that
explain
their
comparatively
higher
antifouling
rejection
comparison
pristine
membrane.
zwitterionic
also
showed
exceptional
flux
stability
recyclability,
longer
potential.
The Science of The Total Environment,
Год журнала:
2024,
Номер
917, С. 170423 - 170423
Опубликована: Янв. 26, 2024
This
study
reports
a
facile
technique
to
synthesize
and
tune
the
cationic
polymer,
poly(3-acrylamidopropyl)trimethylammonium
chloride
(PAPTAC),
in
terms
of
molecular
weight
surface
change
for
harvesting
three
microalgae
species
(Scenedesmus
sp.,
P.purpureum,
C.
vulgaris).
The
PAPTAC
polymer
was
synthesised
by
UV-induced
free-radical
polymerisation.
Polymer
tuning
demonstrated
regulating
monomer
concentration
(60
360
mg/mL)
UV
power
(36
60
W)
obtained
evaluated
different
compared
commercially
available
polymer.
highest
flocculation
efficiency
Scenedesmus
sp.
P.
purpureum
observed
at
dosage
25
mg-polymer/g
dry
biomass
using
PAPTAC-90,
resulting
higher
than
commercial
Results
this
show
evidence
effective
neutralisation
negative
charge
cells
produced
bridging
flocculation.
less
vulgaris,
possibly
due
other
factors
such
as
cell
morphology
composition
extracellular
polymeric
substances
membrane
that
may
also
influence
performance.
Environmental Technology & Innovation,
Год журнала:
2023,
Номер
33, С. 103494 - 103494
Опубликована: Дек. 20, 2023
In
this
study,
activated
algae
granule
was
formed
by
cultivating
a
mixed
culture
of
the
microalga
Chlorella
vulgaris
and
sludge
in
batch
photobioreactors
(PBRs).
Without
aeration,
granulation
process
investigated
through
four
different
agitation
speeds
80,
120,
160,
200
rpm
(shear
stress
0.04,
0.15,
0.35,
0.69
Pa).
Hydrodynamic
shear
created
affected
microeddies.
The
largest
achieved
PBR
with
speed
(R200)
Pa
(size
339
µm).
other
hand,
lower
R160
0.35
Pa)
gave
optimal
results
terms
wastewater
treatment
efficiency
formation
time
(165
days
operation).
Shear
below
0.15
(120
rpm)
showed
no
during
220
operation.
While
from
0.04–0.15
could
guarantee
mass
transfer
for
entire
co-culture
without
0.15–0.69
suitable
range
algae.
This
study
reveals
that
mechanism
is
promissing
solution
microalgae
biomass
recovery
to
substantially
increase
share
renewable
energy
global
mix.
