Hydrothermal
carbonization
(HTC)
is
a
promising
alternative
to
transform
biomass
waste
into
solid
carbonaceous
material
(hydrochar)
and
process
water
with
potential
for
energy
recovery.
In
this
study,
two
alternatives
treatment
by
conventional
acid-assisted
HTC
of
swine
manure
are
discussed.
Process
from
at
180°C
showed
high
biodegradability
(55%
COD
removal)
methane
production
(~
290
mL
CH4
g-1
CODadded)
the
in
an
upflow
anaerobic
sludge
blanket
reactor
allowed
obtaining
yield
(1.3
L
d-1
L-1)
removal
70%).
The
analysis
microbiota
concentration
Synergistota
Firmicutes
phyla,
degradation
capacity
nitrogenous
organic
compounds.
Acid-assisted
proved
be
viable
option
nutrient
recovery
(migration
83%
P
water),
which
salt
chemical
precipitation
MgOH2
(NPK
4/4/0.4)
MgCl2
8/17/0.5),
negligible
content
heavy
metals.
characteristics
precipitated
complied
requirements
European
Regulation
2019/1009
fertilizers
amendments
agricultural
soils,
being
suitable
recycling
nutrients
wastes.
Energies,
Journal Year:
2024,
Volume and Issue:
17(14), P. 3380 - 3380
Published: July 10, 2024
The
optimal
process
conditions
concerning
the
hydrothermal
carbonization
of
digested
sewage
sludge
are
crucial
to
economically
effective
technology
needed
produce
a
solid
product,
hydrochar,
for
energy
purposes.
Accordingly,
different
residence
times,
0.5
h,
1
h
and
2
were
investigated
in
order
understand
effect
time
on
process.
Furthermore,
physical
chemical
properties
hydrochar
compared
raw
material.
For
these
reasons,
analyses
describing
fuel
performed,
including
ultimate
proximate
analyses,
HHV,
TGA
analysis.
latter
method
was
employed
study
combustion
samples.
In
addition,
oxide
content
elements
within
ash
samples
determined
using
XRF
calculate
indices
related
operational
problems
during
results
confirmed
that
did
not
matter
significantly
very
similar
each
other.
However,
contact
angle
longer
processing
resulted
more
hydrophobic
character
enabled
dewaterability
slurry.
It
also
noted
affected
positive
way.
brief,
brittle,
moderately
hydrophilic,
carbon-containing
product
provided
performance
than
sludge.
Environmental Research,
Journal Year:
2023,
Volume and Issue:
245, P. 118062 - 118062
Published: Dec. 27, 2023
Hydrothermal
carbonization
(HTC)
is
considered
a
promising
technology
for
biomass
waste
management
without
pre-drying.
This
study
explores
the
potential
swine
manure
by
comparing
batch
and
continuous
processes,
emphasizing
benefits
of
mode,
particularly
its
full-scale
application.
The
process
at
low
temperature
(180
°C)
resulted
in
hydrochar
with
lower
degree
compared
to
process,
but
similar
characteristics
were
found
both
hydrochars
higher
operating
temperatures
(230-250
°C),
such
as
C
content
(∼
52
wt%),
fixed
carbon
24
wt%)
calorific
value
(21
MJ
kg
This
work
studies
the
valorization
of
swine
manure
by
hydrothermal
carbonization
in
batch
and
continuous
mode
(T
180
–
250
ºC,
residence
time
45
min,
5
wt.%
total
solids).
The
process
resulted
a
hydrochar
with
enhanced
degree,
higher
C
content
(50
55
wt.%)
fixed
carbon
(FC:
~
25
increased
calorific
value
(20
-
22
MJ
kg-1),
compared
to
obtained
process.
In
particular,
mass
yield
was
significantly
lower
at
low
temperature
43
wt.%),
being
very
similar
both
processes
highest
temperatures
(~
20
wt.%).
Thermogravimetric
combustion
analysis
showed
that
hydrochars
exhibited
suitable
characteristics
as
solid
biofuels
for
industrial
use.
water
cases
high
organic
matter
soluble
chemical
oxygen
demand
(7
g
L-1)
(4
10
L-1),
although
gave
rise
diversity
aromatic
N-
O-containing
species.
longer
required
reach
operating
case
system
(heating
ramp)
reduced
H/C
(1.07
1.35)
O/C
(0.47
0.64)
ratios
(H/C
1.32
1.54
0.54
0.65),
which
implied
more
important
role
feedstock
dehydration
decarboxylation
reactions.
Hydrothermal
carbonization
(HTC)
is
a
promising
alternative
to
transform
biomass
waste
into
solid
carbonaceous
material
(hydrochar)
and
process
water
with
potential
for
energy
recovery.
In
this
study,
two
alternatives
treatment
by
conventional
acid-assisted
HTC
of
swine
manure
are
discussed.
Process
from
at
180°C
showed
high
biodegradability
(55%
COD
removal)
methane
production
(~
290
mL
CH4
g-1
CODadded)
the
in
an
upflow
anaerobic
sludge
blanket
reactor
allowed
obtaining
yield
(1.3
L
d-1
L-1)
removal
70%).
The
analysis
microbiota
concentration
Synergistota
Firmicutes
phyla,
degradation
capacity
nitrogenous
organic
compounds.
Acid-assisted
proved
be
viable
option
nutrient
recovery
(migration
83%
P
water),
which
salt
chemical
precipitation
MgOH2
(NPK
4/4/0.4)
MgCl2
8/17/0.5),
negligible
content
heavy
metals.
characteristics
precipitated
complied
requirements
European
Regulation
2019/1009
fertilizers
amendments
agricultural
soils,
being
suitable
recycling
nutrients
wastes.
