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.
Environmental Research,
Год журнала:
2024,
Номер
246, С. 118098 - 118098
Опубликована: Янв. 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.
Renewable Energy,
Год журнала:
2023,
Номер
211, С. 269 - 278
Опубликована: Апрель 30, 2023
The
article
contextualizes
and
expands
upon
research
related
to
oxidative
liquefaction
of
wind
turbine
blades
for
resin
degradation
glass
fiber
recovery,
presented
at
the
17th
SDEWES
conference
series
on
Sustainable
Development
Energy,
Water
Environmental
Systems
2022.
effect
five
different
parameters,
including
reaction
temperature,
residence
time,
pressure,
waste-to-liquid
ratio,
oxidant
concentration,
degradation,
has
been
studied
in
detail.
Experiments
were
performed
temperature
range
250
°C–350
°C
with
a
time
30–90
min,
pressure
20–40
bar,
ratio
5–25%,
concentrations
15–45%
by
weight.
maximum
yield
achieved
was
95–100%
against
combinations
tested
its
minimum
value
43%,
but
detailed
analysis
revealed
that
is
key
parameter
affecting
yield.
In
addition,
energy
consumption
one
important
parameters
determining
economic
feasibility
process,
so
optimization
experimental
plan
based
also
identify
most
suitable
conditions
support
implication
process
larger
scale.
ACS Sustainable Chemistry & Engineering,
Год журнала:
2024,
Номер
12(13), С. 5229 - 5240
Опубликована: Март 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.
There
is
a
need
to
find
methods
intensify
the
anaerobic
digestion
process.
One
possibility
use
of
pre-treatment
techniques.
Many
laboratory
tests
confirm
their
effectiveness,
but
in
most
cases,
there
no
verification
work
carried
out
on
industrial
plants.
The
aim
research
under
conditions
and
large
scale
was
determine
technological
energy
efficiency
hydrodynamic
cavitation
waste
mixture
from
dairy
farms.
It
has
been
shown
that
significantly
increases
concentration
organic
compounds
dissolved
phase.
In
effective
variants,
increase
content
these
indicators
over
90%
for
both
COD
TOC.
degree
solubilisation
achieved
49±2.6%
almost
52±4.4%
Under
conditions,
highest
effects
were
after
10
minutes
pre-treatment.
amount
biogas
average
367±18
mL/gCOD
methane
233±13
mL/gCOD.
Further
large-scale
optimisation
trials
showed
8
cavitation,
yield
327±8
L/kgCOD
with
CH4
62.9±1.9%.
With
this
variant,
net
66.4±2.6
kWh/day,
value
13.9%
higher
than
original
variant
disintegration
3.1%
without
Energies,
Год журнала:
2024,
Номер
17(6), С. 1409 - 1409
Опубликована: Март 14, 2024
There
is
a
need
to
find
methods
intensify
the
anaerobic
digestion
process.
One
possibility
use
of
pretreatment
techniques.
Many
laboratory
tests
confirm
their
effectiveness,
but
in
most
cases,
there
no
verification
work
carried
out
on
industrial
plants.
A
reliable
and
complete
evaluation
new
solutions
can
only
be
plants
that
reflect
operating
conditions
at
higher
readiness
technological
level.
This
has
direct
impact
scientific
value
and,
above
all,
high
application
innovative
technologies.
The
aim
our
research
under
large
scale
was
determine
energy
efficiency
hydrodynamic
cavitation
waste
mixture
from
dairy
farms.
It
been
shown
significantly
increases
concentration
organic
compounds
dissolved
phase.
In
effective
variants,
increase
content
these
indicators
over
90%
for
both
COD
TOC.
degree
solubilisation
achieved
49
±
2.6%
almost
52
4.4%
Under
conditions,
highest
effects
were
after
10
min
pretreatment.
amount
biogas
was,
average,
367
18
mL/gCOD,
methane
233
13
mL/gCOD.
Further
large-scale
optimisation
trials
showed
8
cavitation,
yield
327
L/kgCOD
with
CH4
62.9
1.9%.
With
this
variant,
net
66.4
2.6
kWh/day,
13.9%
than
original
variant
disintegration
3.1%
without
ACS Sustainable Chemistry & Engineering,
Год журнала:
2023,
Номер
11(17), С. 6498 - 6509
Опубликована: Апрель 14, 2023
This
work
studies
the
fate
of
nutrients
(N,
P,
and
K)
during
hydrothermal
treatment
anaerobically
digested
sewage
sludge
to
raise
their
concentrations
in
liquid
phase
facilitate
recovery
as
solid
minerals
by
chemical
precipitation.
The
process
has
been
optimized
evaluating
temperature
(170–230
°C)
reaction
time
(5–60
min)
an
acid-free
medium
or
with
addition
HCl
(0.1–0.5
M).
In
reactions,
were
mainly
concentrated
hydrochar,
which
extracted
0.5
M
(10%
w/v).
Following
this
route,
6.9
g
N/kg,
13.8
P/kg,
8.8
K/kg
contained
feedstock
from
hydrochar
produced
at
230
°C,
which,
considering
direct
nutrient
solubilization
water
treatments,
accounts
for
82,
83,
78%
N,
K
release,
respectively.
HCl-assisted
treatment,
release
directly
into
was
improved
depended
on
acid
concentration
used
a
lesser
extent
temperature.
Operating
°C
HCl,
98%
N
(more
than
45%
NH4–N),
87%
P
(as
PO4–P),
70%
achieved
water.
Chemical
precipitation
phosphorus
nitrogen
allowed
identified
crystalline
struvite,
high
contents
Mg,
NH4–N
negligible
heavy-metal
content.
estimated
cost
could
reach
13.7
euros
per
tonne,
energy
inputs
required
treatment.
