Water Research,
Journal Year:
2024,
Volume and Issue:
255, P. 121524 - 121524
Published: March 27, 2024
In
the
context
of
circular
economy
and
global
shortage
phosphorus
(P)
fertilizer
production,
it
is
crucial
to
effectively
recover
P
during
treatment
disposal
sewage
sludge
(SS).
Although
thermal
SS
has
been
widely
applied,
a
targeted
reclamation
route
not
yet
well
established.
This
study
comprehensively
investigated
compared
physicochemical
properties
solid
residues
(hydrochar
(HC),
biochar
(BC),
ash
(SSA),
hydrochar
(HCA),
(BCA))
after
application
three
typical
techniques
(i.e.,
hydrothermal
carbonization
(180‒240
°C),
pyrolysis
(400‒600
°C)
combustion
(850
℃).
speciation
transformation
processes
were
extensively
explored
followed
by
rational
proposal
effective
routes.
Specifically,
processing
decomposed
organic
converted
non-apatite
apatite
P.
Orthophosphate-P
was
found
be
main
species
in
all
samples.
Physicochemical
resulting
thermal-derived
products
significantly
affected
thereby
determining
their
feasibility
for
different
purposes.
particular,
recommended
agricultural
use
due
higher
harmful
metals
content,
while
acid
leaching
can
an
alternative
solution
synthesize
non-Fe-containing
because
lower
co-dissolved
Fe
content
leachate.
HC
BC
offer
option
synthesis
containing
products.
Eventually,
demonstrate
great
potential
agriculture
application,
however,
comprehensive
risk
assessment
should
conducted
before
real-world
applications.
