Environmental Technology Reviews,
Journal Year:
2024,
Volume and Issue:
14(1), P. 1 - 16
Published: Dec. 31, 2024
Managing
sewage
sludge
effectively
is
a
major
challenge
in
today's
environmental
practices.
This
due
to
the
rising
production
and
of
finding
sustainable
treatment
disposal
methods.
review
addresses
growing
need
for
strategies
that
minimise
while
adhering
stringent
standards.
In
response
this
pressing
issue,
it
essential
implement
meeting
requisite
goals
standards
treated
wastewater.
study
examines
scientific
intricacies
Oxic-Settling-Anaerobic
(OSA)
system,
strategic
innovation
aimed
at
addressing
cost
considerations,
mitigating
pollution,
optimising
efficiency
reduction.
comprehensive
evaluates
effectiveness
process,
analyzing
its
potential
achieve
significant
reduction
across
various
segments
wastewater
plants.
Furthermore,
evaluated
compared
other
techniques,
offering
analysis
performance
relative
alternative
Moreover,
we
examine
alterations
OSA
process
carry
out
thorough
economic
analysis,
valuable
insights
future
research
industrial
applications.
not
only
synthesises
current
knowledge
management
but
also
underscores
practical
advancing
The Science of The Total Environment,
Journal Year:
2024,
Volume and Issue:
924, P. 171420 - 171420
Published: March 3, 2024
The
paper
reports
the
results
of
an
experimental
study
aimed
at
comparing
two
configurations
a
full-scale
wastewater
treatment
plant
(WWTP):
conventional
activated
sludge
(CAS)
and
oxic-settling-anaerobic
process
(OSA)
with
intermittent
aeration
(IA).
A
comprehensive
monitoring
campaign
was
carried
out
to
assess
multiple
parameters
for
configurations:
carbon
nutrient
removal,
greenhouse
gas
emissions,
respirometric
analysis,
production.
holistic
approach
has
been
adopted
in
novelty
including
footprint
(CF)
contribution
(as
direct,
indirect
derivative
emissions)
configurations.
Results
showed
that
OSA-IA
configuration
performed
better
total
chemical
oxygen
demand
(TCOD)
ortho-phosphate
(PO4-P)
removal.
CAS
Total
Suspended
Solids
(TSS)
removal
showing
worsening
settling
properties
OSA-IA.
heterotrophic
yield
coefficient
maximum
growth
rate
decreased,
suggesting
shift
reduction
metabolism
configuration.
Autotrophic
biomass
reduced
due
negative
effects
holding
tank
on
nitrification.
had
higher
emissions
(30.5
%
vs
21.3
CAS)
from
additional
energy
consumption
mixers
recirculation
pumps.
CF
value
lower
than
(0.36
kgCO2/m3
0.39
CAS).
Journal of Cleaner Production,
Journal Year:
2024,
Volume and Issue:
468, P. 143052 - 143052
Published: June 29, 2024
Biopolimer
materials,
such
as
polyhydroxyalkanoates
(PHA),
are
essential
to
restrain
the
use
of
petroleum-based
plastic
material
fostered
by
European
Union
regulation.
Despite
recent
development
regarding
production
PHA,
scale-up
sewage
sludge-based
technology
is
still
in
its
infancy
since
literature
lacks
studies
on
environmental
impact
process.
This
work
aims
stand
a
pioneer
study
reporting
direct
greenhouse
gas
(GHG)
emissions
and
carbon
footprint
(CF)
two
PHA
strategies.
The
strategies,
aerobic
dynamic
feeding
(ADF)
aerobic/anoxic
enrichment
(AE/AN),
were
monitored
compared
based
system's
efficiency
removing
nutrients,
PHA's
productivity,
nitrous
oxide
CF.
produced
accounted
for
38.21
g
g−1
volatile
suspended
solids
(VSS)
%
14.54
VSS
%,
ADF
AE/AN,
respectively.
N2O
lower
than
AE/AN
enrichment,
0.39
N2O–N
L−1
0.98
L−1,
respectively,
was
CF,
which
3.56
kg
CO2
day−1
6.91
innovative
provides
valuable
insights
into
comparing
above-mentioned
strategies
pilot
structuring
designing
future
comprehensively
considering
consequences
process
life
cycle
assessments.
Journal of Water Process Engineering,
Journal Year:
2024,
Volume and Issue:
58, P. 104847 - 104847
Published: Jan. 25, 2024
This
study
compares
two
Oxic
Settling
Anaerobic
(OSA)
–
Membrane
Bioreactor
(MBR)
configurations
fed
with
real
wastewater.
The
novelty
of
the
is
to
consider
an
MBR
configuration
(namely,
MBR-OSA
II)
never
investigated
OSA
process.
influence
hydraulic
retention
time
(HRT)
inside
anaerobic
reactor
for
each
I
and
was
investigated.
Four
experimental
periods
were
carried
out:
Period
II
I,
under
HRT
4
6
h,
respectively,
III
IV
II,
respectively.
Results
showed
decay
rate
bH
increased
HRT,
especially
during
Periods
(from
0.62
d−1
0.77
d−1).
influenced
total
sewage
sludge
production.
With
increase
same
configuration,
production
decreased.
In
terms
biological
production,
a
substantial
reduction
occurred
operation
compared
I.
However,
despite
providing
highest
(78
%)
(during
IV),
this
Period,
N2O
(N2O
emission
factor
till
3.1
membrane
fouling
occurred.
Indeed,
resistance
25
·
10−13
m−1).
Thus,
equal
h
provided
best
results.
Journal of Environmental Management,
Journal Year:
2025,
Volume and Issue:
373, P. 123839 - 123839
Published: Jan. 1, 2025
The
wastewater
treatment
plants
(WWTPs)
must
be
transformed
into
Water
Resource
Recovery
Facilities
(WRRFs)
in
view
of
a
more
sustainable
approach
focusing
on
the
circular
economy
concept.
Different
to
WWTPs,
WRRFs
have
as
major
goal
not
only
meet
legislation
limits
but
also
recovery
resources
such
as:
treated
water
for
reuse,
carbon,
nutrients,
biopolymers
etc.
In
boosting
application
real
WWTs,
WRRF
at
Palermo
University
(UNIPA)
has
been
built
within
EU
project:
Achieving
Wider-Uptake
Smart
Solutions.
This
study
is
aimed
demonstrate
feasibility
resource
from
UNIPA
WRRF.
Specifically,
effects
(TWW)
and
recovered
nutrients
faba
bean
were
assessed.
Results
showed
that
aligned
with
legislation.
Further,
TWW
increased
soil
electrical
conductivity
adversely
impacted
plant
growth.
However,
biochar
zeolite
effectively
mitigated
these
adverse
effects.
Microbiological
investigation
revealed
both
broad
pods
seeds
analysed
did
host
pathogenic
bacteria.
Journal of Environmental Management,
Journal Year:
2025,
Volume and Issue:
375, P. 124240 - 124240
Published: Jan. 29, 2025
The
products
of
an
advanced
sewage
sludge
fermentation
process
can
be
used
to
generate
polyhydroxyalkanoates
(PHAs),
precursors
bioplastics
considered
excellent
candidates
for
replacing
petroleum-derived
plastics.
aerobic
feast-anoxic
famine
cycling
strategy
has
proven
efficient
method
enriching
microbiota
with
PHA-producing
microorganisms.
This
work
evaluated
the
effect
different
carbon
nitrogen
ratios
(C/N)
3.5,
2,
and
1
g
COD/g
N
modulating
structure
improve
PHA
production.
study
was
executed
on
a
pilot
plant
scale
using
wasted
activated
as
organic
source
derived
from
oxic-settling
anaerobic
that
collects
wastewater
various
facilities
at
University
Palermo
campus.
production
performance
monitored
over
three
experimental
periods
characterized
by
C/N
ratio.
results
showed
lower
reduced
20,
24,
26
%
w/w
PHAs
COD/N
values
1,
3.5
N,
respectively.
In
parallel,
metataxonomic
analysis
revealed
higher
abundance
microorganisms
ratio
such
Proteobacteria,
specifically
Betaproteobacteria.
addition,
increase
in
fungal
diversity
decrease
decreased.
Thus,
these
findings
demonstrate
utility
metataxonomics
elucidating
relationships
between
operating
conditions,
bacterial
achievement
specific
outputs.
insights
gained
this
demonstrated
positive
correlation
ratios,
microorganisms,
yields.
Water Research,
Journal Year:
2024,
Volume and Issue:
266, P. 122352 - 122352
Published: Aug. 29, 2024
In
a
membrane
bioreactor
(MBR)
system,
in
situ
sludge
reduction
techniques
induce
fouling.
To
address
this
challenge,
we
incorporated
rotating
mesh
carrier,
which
can
adsorb
organic
matter
and
provide
habitat
for
metazoans,
into
the
anoxic
tank
of
conventional
anoxic/oxic-MBR
(A/O-MBR)
termed
biological
contactor-MBR
(RBC-MBR),
evaluated
treatment
performance.
Over
151
days,
lab-scale
RBC-MBR
A/O-MBR
were
used
to
treat
municipal
sewage.
Both
reactors
showed
similar
COD
NH
Journal of Environmental Management,
Journal Year:
2024,
Volume and Issue:
354, P. 120345 - 120345
Published: Feb. 23, 2024
This
study
presents
the
effects
on
carbon
and
nutrient
removal,
membrane
fouling
greenhouse
gas
(GHG)
emissions
of
an
Oxic-Settling-Anaerobic
(OSA)
–
Membrane
Bioreactor
(MBR)
pilot
plant
fed
with
real
wastewater.
The
influence
three
sludge
return
internal
ratios
(IR)
was
investigated
by
testing
45,
75
100%.
results
showed
that
increase
IR,
biological
production
substantially
decreased
85.8%
due
to
combination
cell
lysis
endogenous
metabolism.
However,
a
worsening
ammonia
removal
efficiencies
occurred
(from
94.5
%
84.7
IR
value
45
100%,
respectively)
mostly
release
caused
under
anaerobic
conditions.
N2O
emission
factor
increased
rise
(namely,
from
2.17%
2.54%
total
influent
nitrogen).
In
addition,
variation
footprint
(CF)
(0.78,
0.62
0.75
kgCO2eq
m−3
100%
mainly
different
energy
consumption
oxidation
during
periods.
study's
relevance
is
address
optimal
operating
conditions
in
view
reducing
production.
this
light,
need
identify
trade-off
between
advantages
disadvantages
increasing
GHG
must
be
identified
future.
