Revista Brasileira de Ciências Ambientais,
Journal Year:
2024,
Volume and Issue:
59
Published: Jan. 1, 2024
As
wastewater
treatment
advances,
there
is
a
growing
need
to
remove
pollutants
and
recover
valuable
resources.
This
study
focuses
on
the
optimization
of
aerobic
granular
sludge
process,
exploring
impact
varying
anaerobic
period
production
bioresources,
i.e.,
synthesis
extracellular
polymeric
substances
(EPS),
alginate-like
exopolysaccharides
(ALE
—
like
exopolysaccharides),
tryptophan
(TRP).
To
this
end,
two
sequential
batch
reactors
(SBRs)
were
used,
R1
R2,
fed
with
acetic
propionic
acid,
respectively,
subjected
different
durations
phase
(100,
70,
35,
0
min)
in
total
cycle
time
6
h.
The
results
similar
regarding
COD,
N,
P
removal.
However,
R2
showed
greater
nitrate
accumulation.
Statistical
analyses
highlighted
significant
variations
SPE
concentrations
phases
(p<0.05)
both
systems.
ALE
was
highest
initial
phase,
decreasing
reduction
period.
trend
not
observed
system
(p≈0.13).
Tryptophan
remained
stable
across
all
for
reveal
that
duration
significantly
influences
bioresource
production,
emphasizing
importance
defining
optimal
operational
conditions
efficient
resource
recovery
treatment.
Energies,
Journal Year:
2024,
Volume and Issue:
17(11), P. 2474 - 2474
Published: May 22, 2024
Municipal
sewage
sludge
(MSS)
is
an
inevitable
byproduct
of
wastewater
treatment,
with
increasing
amounts
year
by
worldwide.
The
development
environmentally
and
economically
acceptable
methods
for
the
sustainable
management
MSS
a
major
environmental
challenge.
Nowadays,
practices,
besides
commonly
used
stabilization
methods,
focus
attention
on
alternative
sludge-disposal
pathways,
which
encompass
enhanced
energy
valuable-resource
recovery.
This
review
presents
recent
advances
in
recovery
selected
value-added
products
from
sludge.
Because
high
nitrogen
phosphorus
concentrations,
waste
can
be
nutrient
source
(e.g.,
struvite).
paper
discusses
conditions
technology
struvite
As
extracellular
polymeric
substances
(EPSs)
biological
sludge,
alginate-like
exopolymers
(ALEs)
are
present
systems
that
treat
municipal
wastewater.
yields,
dynamics
content,
characterization
ALEs
their
possible
applications
were
analyzed.
important
humic
substances.
Their
occurrence,
characterization,
yields
various
types
untreated,
composted,
digested
sludge)
main
application
presented.
aspects
trends
pyrolysis,
including
thermochemical
conversion
to
biochar,
discussed
this
review.
biochar
derived
assessment
risks
also
covered.
explores
potential
use
applications,
soil
amendment,
carbon
sequestration,
remediation.
