Separation Science and Technology,
Journal Year:
2024,
Volume and Issue:
59(10-14), P. 1183 - 1201
Published: June 17, 2024
The
production
of
municipal
sludge
is
increasing
with
the
development
urbanization
in
these
years.
usually
has
a
high
moisture
content
and
contains
large
number
organic
pollutants.
Inappropriate
treatment
methods
will
lead
to
secondary
pollution.
Conventional
mechanical
dehydration
can
hardly
meet
requirements
for
subsequent
disposal.
Flocculation
widely
used
dewaterability
enhancement
its
economic
efficiency
reliability.
This
paper
provides
comprehensive
review
flocculation-based
techniques
dewatering.
Firstly,
advantages
disadvantages
pretreatment
elaborated.
Even
though
flocculation
applied
dewatering,
deep
always
faces
bottleneck
area
such
as
removing
cell
bound
water
changing
structure
EPS,
etc.
when
using
individual
flocculation.
Limited
understanding
mechanisms
behaviors
joint
technology
physical/chemical/biological
methods,
have
been
highlighted
knowledge
gaps
Some
specific
cases,
action,
practical
considerations,
dewatering
effects
analyses
flocculation-coupled
multiple
technologies
are
analyzed
detail,
Finally,
limitations,
challenges
outlook
flocculants
comprehensively
discussed.
In
the
sludge
dewatering
process,
a
formidable
challenge
arises
due
to
robust
interactions
between
extracellular
polymeric
substances
(EPS)
and
bound
water.
This
study
introduces
novel,
synergistic
conditioning
method
that
combines
iron
(Fe2+)/peroxymonosulfate
(PMS)
polyacrylamide
(PAM)
significantly
enhance
efficiency.
The
application
of
Fe2+/PMS-PAM
led
substantial
reduction
in
specific
filtration
resistance
(SFR)
by
82.75%
capillary
suction
time
(CST)
80.44%,
marking
considerable
improvement
performance.
Comprehensive
analyses
revealed
pre-oxidation
with
Fe2+/PMS
process
effectively
degraded
EPS,
facilitating
release
Subsequently,
PAM
enhanced
flocculation
fine
particles
resulting
from
advanced
oxidation
processes
(AOPs).
Furthermore,
analysis
based
on
Extended
Derjaguin-Landau-Verwey-Overbeek
(XDLVO)
theory
demonstrated
shifts
interaction
energies,
highlighting
breakdown
energy
barriers
within
transition
surface
characteristics
hydrophilic
(3.79
mJ·m-2)
hydrophobic
(-61.86
mJ·m-2).
shift
promoted
spontaneous
aggregation
particles.
Additionally,
Flory-Huggins
established
quantitative
relationship
gel
formation
incorporating
concept
chemical
potential.
introduction
disrupted
uniformity
EPS-formed
layer,
reducing
potential
difference
permeate
water
leading
lower
SFR
investigation
provides
valuable
insights
into
thermodynamics
oxidative
treatment,
presenting
sophisticated
strategies
for
management
expanding
understanding
innovative
methods.
This
study
conducted
experiments
to
optimize
the
electro-dewatering
of
sludge
using
a
dynamic
model
calculation
method
and
Wild
Horse
optimizer.
Specifically,
we
explored
two
factors
that
might
influence
dewatering:
composition
electrode
materials
strength
electrical
field.
Compared
other
electrodes
commonly
used
in
electro-dewatering—such
as
RuO2/Ir2O3-Ti,
graphite,
Ir2O3/Ta2O5-Ti,
Ti—the
Electro-kinetic
Geosynthetics
(EKG)
exhibited
superior
performance.
was
determined
by
considering
both
energy
consumption
establishment.
Our
findings
also
identified
electric-field
crucial
factor
determining
final
moisture
content.
As
intensity
increased,
dewatering
effect
improved,
aligning
with
our
calculations.
However,
observed
steep
increase
per
kilogram
filtrate
when
exceeded
certain
threshold.
To
dehydration
process,
constructed
multi-factor
model.
The
simulation
results
from
this
confirmed
is
primary
affecting
dehydration.
It
established
10
V/cm
critical
threshold
for
process.
Water,
Journal Year:
2024,
Volume and Issue:
16(4), P. 545 - 545
Published: Feb. 9, 2024
This
study
systematically
compared
the
performance
of
five
corrosion-resistant
electrode
materials
for
electro-dewatering.
Through
a
comprehensive
analysis
dewatering
efficiency,
energy
consumption,
and
corrosion
resistance,
conductive
plastic
composite
electrodes
(EKG)
were
selected
as
optimal
material
experimentation.
Additionally,
impact
electric
field
strength
spacing
on
efficiency
consumption
electro-dewatering
(EDW)
was
investigated.
The
results
showed
that
increase
in
intensity
could
improve
solid
content
sediments,
but
corresponding
also
increased.
increased
plates
reduced
dehydration
effect
consumption.
By
employing
Wild
Horse
Optimization
algorithm,
empirical
multifactorial
response
models
solidification
process
established,
aimed
at
predicting
concludes
remediation
heavy
metals,
should
not
exceed
10
V/cm
to
avoid
excessive
metal
migration
potential
adverse
chemical
reactions.
