Chemical Engineering Journal,
Год журнала:
2024,
Номер
491, С. 151972 - 151972
Опубликована: Май 6, 2024
This
study
presents
a
mechanistic
approach
to
explore
the
key
operational
parameters
governing
flux
performance
of
an
SAnMBR
system
coupled
with
ceramic
flat-sheet
ultrafiltration
membrane.
Experiments
were
conducted
at
mixed
liquor
suspended
solid
(MLSS)
concentrations
12,
18,
and
24
g/L
using
biogas
sparging,
backwashing,
combination
both
investigate
most
effective
fouling
mitigation
strategy
by
exploring
mechanism
critical
regime.
To
validate
experimental
findings,
mathematical
model
was
used
simulate
time-based
variation
membrane
pore
radius
(m),
decrease
in
porosity
(%),
thickness
cake
layer
resistance
(1/m).
The
found
that
low
biomass
concentration,
there
sharp
decline
leading
increase
absence
any
strategies.
However,
implementing
these
strategies
individually
combination,
they
maintained
higher
controlled
even
high
concentrations.
It
observed
sparging
outperformed
conventional
backwashing
exhibited
superior
attaining
rates
for
prolonged
duration.
advanced
spectroscopic
analysis
confirmed
presence
concentration
polysaccharides
responsible
biofouling,
significant
blocking
due
inorganic
foulants
suggests
must
be
operated
optimised
levels
below
sustained
operation.
Additionally,
identified
provide
precise
assessment
performance,
improve
its
design
efficiency
field
applications.
Chemical Engineering Journal,
Год журнала:
2024,
Номер
486, С. 150260 - 150260
Опубликована: Март 8, 2024
Anaerobic
membrane
bioreactors
hold
immense
promise
for
wastewater
treatment
owing
to
their
elevated
organic
load
tolerance,
cost-effectiveness,
and
potential
energy
recovery.
Nevertheless,
fouling
is
a
significant
impediment
its
widespread
implementation.
This
review
focuses
on
utilizing
eco-friendly
bioflocculants
control
in
anaerobic
bioreactors.
Initially,
it
provides
comprehensive
overview
of
the
mechanisms
mitigating
fouling.
Subsequently,
examines
performance,
mechanisms,
influencing
factors
reducing
by
AnMBRs.
Charge
density,
molecular
weight,
bioflocculant
dosage,
feed
water
properties,
operational
parameters
can
affect
efficacy.
The
primary
mechanism
helpful
reduce
concentrations
Extracellular
Polymeric
Substances
(EPS)
Soluble
Microbial
Products
(SMP)
Additionally,
conventional
methods
are
introduced
compared
with
bioflocculants,
emphasizing
notable
advantages,
such
as
biodegradability,
low
toxicity,
availability,
cost-effectiveness.
In
conclusion,
outlines
challenges
associated
elucidates
directions
future
development.
Water Research,
Год журнала:
2024,
Номер
260, С. 121867 - 121867
Опубликована: Июнь 6, 2024
Biofouling
is
the
main
challenge
in
operation
of
anaerobic
membrane
bioreactors
(AnMBRs).
strongly
depends
on
temperature;
therefore,
we
hypothesize
that
interactions
and
viscoelastic
properties
soluble
microbial
products
(SMP)
extracellular
polymeric
substances
(EPS)
vary
with
temperature,
consequently
influencing
permeability.
This
study
compares
performance
an
AnMBR
operated
at
a
similar
permeate
flux
two
temperatures.
The
transmembrane
pressure
rose
rapidly
after
5
±
2
days
25°C
but
only
18
35°C,
although
reactor's
biological
was
both
temperatures,
terms
efficiency
dissolved
organic
carbon
removal
biogas
composition,
which
were
obtained
by
changing
hydraulic
retention
time.
Using
confocal
laser
scanning
microscopy,
higher
biofilm
amount
detected
than
while
QCM-D
showed
more
adhesive,
less
viscous
elastic,
EPS
layer.
In
situ
optical
coherence
tomography
(OCT)
ultra-filtration
cell,
fed
MLSS
revealed
rate
(TMP)
increase
25°C,
attachment
biomass
from
mixed
liquor
suspended
solids
markedly
less.
Increased
adhesion
to
can
accelerate
TMP
during
OCT
filtration
cell.
EPS's
reduced
viscoelasticity
suggests
floc
integrity
possible
increased
penetration
into
pores.
Analysis
structures
communities
constituting
flocs
biofilms
reveals
temperature's
effects
richness,
diversity,
abundance,
likely
influence
observed
consequent
fouling.
Results in Engineering,
Год журнала:
2024,
Номер
21, С. 101839 - 101839
Опубликована: Фев. 2, 2024
Volatile
fatty
acid
(VFA)
production
from
sewage
sludge
has
become
one
of
the
main
biotechnologies
implemented
in
view
circular
economy
application
wastewater
treatment
plant
(WWTP)
management.
In
this
study,
domestic
collected
three
WWTPs
over
two-year
experiments
was
subjected
to
acidogenic
fermentation.
The
fermented
liquid
recovered
through
an
ultrafiltration
membrane.
membrane
fouling
analysed
detail
by
applying
resistance
series
model,
revealing
major
role
extra
polymeric
substances
reversible
fouling,
accounting
for
91.2
%
total
resistance.
Finally,
contribution
carbon
footprint
assessment
due
indirect
emissions
(1.30
kg
CO2eq/m3).
study
novelty
providing
in-depth
understanding
MBR
used
solid/liquid
separation
a
aimed
at
VFA
recovery
Also,
provides
insights
regarding
environmental
impact
Critical Reviews in Environmental Science and Technology,
Год журнала:
2023,
Номер
54(10), С. 817 - 839
Опубликована: Ноя. 15, 2023
Anaerobic
membrane
bioreactors
(AnMBRs)
are
seen
as
a
promising
technology
for
application
in
water
reuse
schemes.
However,
the
evidence
base
their
potential
and
efficacy
this
regard
is
fragmented.
We
draw
together
disparate
knowledge
to
offer
state
of
art
review
municipal
wastewater
treatment
with
AnMBRs
evaluate
technology's
reuse.
Water
quality
regulations
standards
from
different
regions
world
used
performance
metrics
compare
contrast
pilot
laboratory
scale
AnMBR
systems
reported
literature
(n
=
50).
Findings
indicate
that
under
stable
operation,
have
produce
agricultural
without
post-treatment,
incapable
delivering
meets
other
non-potable
across
range
important
parameters
such
COD,
BOD5,
NH3-N
TP.
Analysis
key
operational
determine
operation
purpose
cover
influent
matrix,
pH,
temperature,
hydraulic
retention
time,
system
configuration.
An
assessment
candidate
post-treatment
technologies
suggests
tradeoff
between
cost
effluent
based
on
requirement.
conclude
by
discussing
number
challenges
limitations
use
applications
order
outline
pathway
maturity
effective
trains.
