Bioremediation Journal,
Journal Year:
2023,
Volume and Issue:
28(4), P. 564 - 578
Published: Dec. 12, 2023
Sewage
sludge
is
a
by-product
of
municipal
wastewater
treatment,
and
its
production
increasing
with
population
growth
urbanization.
Hydrothermal
carbonization
(HTC)
promising
method
for
managing
sewage
due
to
applicability
cost-effectiveness.
The
HTC
process
produces
hydrochar,
stabilized
carbon
material
derived
from
sludge.
In
this
study,
was
subjected
at
optimized
conditions
200
°C
6
h
using
the
response
surface
methodology
(RSM)
statistical
tool.
structural
morphology
hydrochar
analyzed
Scanning
Electron
Microscopy
Transmission
Microscopy,
which
revealed
fluffy
coarse
deeper
fragments,
indicating
presence
microspheres.
Fourier
Transform
Infrared
(FTIR)
spectra
showed
that
retained
similar
functional
groups
as
original
sludge,
such
hydroxyl,
aliphatic
methyl,
amino,
ketonic,
amide,
ether
groups,
minimal
shifts
reductions
in
vibrational
peaks.
Fuel,
Journal Year:
2023,
Volume and Issue:
350, P. 128807 - 128807
Published: June 1, 2023
The
impacts
of
operating
conditions
on
hydrothermal
carbonization
sewage
sludge
(SS)
in
water
media
were
investigated
this
study.
Hydrothermal
co-carbonization
(co-HTC)
SS
and
cheese
whey
was
also
carried
out
under
selected
(T
=
250
°C,
t
5
h),
to
investigate
the
effects
replacing
with
product
properties.
Besides,
potential
application
tested
HTC
products
for
agricultural
use.
treatment
increased
content
nutrients
(P,
Ca,
Mg)
hydrochars
compared
untreated
SS,
but
fuel
properties
not
improved.
Increasing
temperature
time
contents
nitrogen
volatile
fatty
acids
process
liquids.
replacement
resulted
remarkable
improvement
hydrochar,
as
hydrochar
yield
from
57.10
64.14
wt%,
calorific
value
14.75
18.29
MJ/kg,
carbon
36.89
45.24
wt%.
ash
decreased
46.55
40.06
N,
P,
Mg
K
significantly.
SEM-EDS,
FTIR
thermogravimetric
analysis
revealed
strong
influence
behaviour
their
chemical
proved
efficient
fertiliser
a
germination
test
plants.
Process
liquids
can
be
used
an
N
fertiliser,
while
P
fertiliser.
Undiluted
toxic
freshwater
organisms
Daphnia
magna.
Advances in Bamboo Science,
Journal Year:
2024,
Volume and Issue:
6, P. 100060 - 100060
Published: Feb. 1, 2024
This
study
investigated
an
integrated
CO2-hydrothermal
carbonization
(CO2-HTC)
and
steam
gasification
of
bamboo
feedstock,
abundant
biomass
in
Vietnam.
Bamboo
underwent
CO2-HTC
at
240
°C
under
100%
CO2
atmosphere
with
a
biomass-to-water
ratio
1:4
residence
time
60
min.
The
resulting
hydrochar
served
as
feedstock
for
900
40%
H2O
60%
N2.
A
parallel
experiment
using
raw
provided
basis
comparison.
Results
indicate
notable
enhancements
fixed
carbon
content,
bulk
density,
higher
heating
value
subsequent
to
CO2-HTC.
displayed
maximum
decomposition
rate.
Its
char
also
showed
quicker
conversion,
enhancing
efficiency.
syngas
richer
both
H2
CO
by
2%
was
produced
compared
the
bamboo.
observed
improvements
performance
suggest
promising
avenues
more
effective
sustainable
utilization
energy
production.
