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.
Environmental Research,
Journal Year:
2024,
Volume and Issue:
246, P. 118098 - 118098
Published: Jan. 5, 2024
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
STP
CH4
g−1
CODadded)
the
in
an
upflow
anaerobic
sludge
blanket
reactor
allowed
obtaining
yield
(1.3
L
L−1·d−1)
removal
(∼70%).
The
analysis
microbiota
concentration
Synergistota
Firmicutes
phyla,
degradation
capacity
organic
nitrogenous
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.
ACS Sustainable Chemistry & Engineering,
Journal Year:
2024,
Volume and Issue:
12(13), P. 5229 - 5240
Published: March 21, 2024
This
study
aims
to
obtain
a
carbonaceous
material
with
suitable
properties
be
used
as
solid
biofuel
by
recycling
process
water
from
hydrothermal
carbonization
(HTC)
of
garden
and
park
waste
(GPW).
The
research
is
focused
on
maximizing
mass
yield
energy
recovery
well
facilitating
the
treatment
liquid
fraction
throughout
reusing
cycles
fraction.
Process
moderately
improved
performance
hydrochar,
resulting
in
higher
almost
20
percentage
points
compared
that
achieved
(less
than
79%)
conventional
HTC
(GPW
+
freshwater
feed).
An
improvement
char
fuel
quality
was
observed,
showing
more
morphological,
physical,
chemical
characteristics,
reactivity
combustion
temperature,
lower
probability
ash
sintering.
Successive
reuse
allowed
some
increase
but,
at
same
time,
degraded
hydrochar
biofuel.
composition
showed
an
oxygen
demand
total
organic
carbon,
which
doubled
after
three
successive
cycles.
concentration
volatile
fatty
acids
increased
around
5-fold
(up
g
L–1),
acetic
acid
accounting
for
85%
total.
Subsequent
anaerobic
digestion
removed
up
75%
COD
yielded
biogas
high
methane
content
(225–302
N
mL
CH4
g–1
CODadded).
Recycling
significantly
(hydrochar
methane)
90%
single
recycling,
84%
subsequent
water.
Journal of Power Sources,
Journal Year:
2024,
Volume and Issue:
614, P. 235043 - 235043
Published: July 14, 2024
Sodium-ion
batteries
(SIBs)
are
considered
promising
candidates
for
future
grid
energy
storage,
with
hard
carbons
emerging
as
key
commercial
anode
materials.
This
study
presents
a
novel
approach
to
synthesize
N-doped
via
co-hydrothermal
treatment
of
vine
shoots
and
pig
manure
subsequent
thermal
annealing
the
resulting
hydrochar.
method
enhances
development
micro-
ultra-microporosity
in
synthesized
carbons,
nitrogen,
lesser
extent
phosphorus
sulfur,
introduced
doping
elements.
Furthermore,
incorporation
hydrochloric
acid
during
hydrothermal
step
promotes
biomass
hydrolysis,
leading
increased
mesoporosity
formation
microsphere
clusters.
In
realm
electrochemical
performance,
an
investigation
into
various
ester-
ether-based
electrolytes
has
revealed
NaPF6
diglyme
best
formulation,
thanks
its
thinner
more
stable
solid
electrolyte
interface
(SEI).
Using
this
electrolyte,
best-performing
electrode
showed
initial
Coulombic
efficiency
(ICE)
73
%,
reversible
capacities
239,
180,
86,
57
mAh
g−1
at
0.1,
1,
5,
10
A
g−1,
respectively.
addition,
exhibited
remarkable
capacity
retention
88
%
after
250
cycles
well
compatible
behavior
when
paired
NVPF-based
cathode.
Research Square (Research Square),
Journal Year:
2025,
Volume and Issue:
unknown
Published: April 28, 2025
Abstract
This
study
evaluates
the
fuel
properties
and
energy
performance
of
hydrochar
produced
through
co-hydrothermal
carbonization
(Co-HTC)
swine
manure
(SM)
coffee
waste
(CW).
The
effects
reaction
temperature
(160°C,
200°C,
240°C)
mixing
ratio
(SM:CW
=
1:1,
3:1,
5:1)
on
combustion
characteristics,
densification
(EDR),
yield
(EY)
were
analyzed.
results
indicate
that
Co-HTC
effectively
enhances
quality
by
leveraging
synergistic
interactions
between
SM
CW.
At
240°C
a
1:1
ratio,
exhibited
characteristic
index
(S)
9.1
×
10⁻⁹
%²/min²·°C³,
an
EDR
1.39,
EY
57%,
demonstrating
superior
performance.
high
lignin
content
in
CW
promoted
fixed
carbon
retention,
while
elevated
nitrogen
contributed
to
potential
agricultural
applications.
Additionally,
reduced
O/C
H/C
atomic
ratios,
resulting
enhanced
density.
Despite
increase
ash
with
higher
values
remained
across
all
conditions,
maximum
61.8%
at
5:1
suggesting
retention
was
not
significantly
hindered.
These
findings
confirm
is
viable
approach
converting
organic
into
high-energy-density
solid
fuel,
offering
sustainable
solution
for
bioenergy
production
valorization.
