Journal of Environmental Quality,
Год журнала:
2022,
Номер
52(3), С. 584 - 595
Опубликована: Дек. 17, 2022
Phosphorus
(P)
is
an
essential
element
to
produce
feed
and
fertilizers
but
also
a
nonrenewable
resource.
Both
the
predicted
exhaustion
of
phosphatic
rocks
risk
eutrophication
lead
increasing
necessity
for
P
recovery
methodologies
be
applied
in
municipal
wastewater
treatment
plants
(WWTPs).
One
most
promising
solutions
involves
precipitation
P-based
minerals
reusable
as
slow-release
fertilizers.
In
this
study,
struvite
hydroxyapatite
from
WWTP
digestate
liquid
fraction
(centrate)
was
investigated
at
varying
pH
(8-10),
reagent
typologies
(MgCl2
,
NaOH,
Ca(OH)2
CaCl2
),
concentrations
under
limiting
magnesium
doses
through
liquid-
solid-phase
analyses
thermodynamical
modeling.
A
maximum
87.3%
achieved
9
by
adding
NaOH
MgCl2
dose
656
mg/L
(the
higher
tested).
According
these
data,
it
estimated
that
92.0
tons/year
33.2
could
recovered
centrate
with
cost
consumption
being
almost
50%
mean
market
value.
An
increase
observed
while
comparing
experiments
same
values
Mg2+
dose.
Ca2+
addition
led
extensive
mainly
amorphous
phases
interfere
formation.
Environmental Technology & Innovation,
Год журнала:
2024,
Номер
34, С. 103631 - 103631
Опубликована: Апрель 9, 2024
Phosphorus
(P)
removal
still
faces
challenges
in
eutrophic
water
treatment.
Combining
adsorption
and
biological
reaction
can
efficiently
reduce
the
P
concentrations,
achieving
long-term
function.
In
this
study,
five
kinds
of
pellets
were
produced
using
cement,
bentonite,
organic
carbon
(rice
husk
powder)
with
mass
ratios
100%:0%:0%
(M1),
95%:5%:0%
(M2),
92.5%:5%:2.5%
(M3),
90%:5%:5%
(M4),
85%:5%:10%
(M5)
for
phosphorus
water.
The
static
experiment
revealed
that
both
Langmuir
Freundlich
models
suitable
describing
characteristics.
P-bonding
energy
(KL)
capacity
(K)
followed
order
M1
<
M2
M3
M4
M5.
processes
conformed
to
Pseudo-second-order
kinetic
model.
capability
decreased
increasing
pH
levels.
Cl−,
NO3−,
SO42−
showed
negligible
effects
on
adsorption,
while
CO32−
reduced
amount.
dynamic
experiment,
all
have
sustained
efficiency
average
rates
58.54%
60.78%
63.97%
66.81%
72.05%
(M5).
presence
CaHPO4·2H2O
after
indicated
phosphate
precipitation
ion
exchange.
attached
microbes
exhibited
an
increase
Proteobacteria
abundance
contributed
effectiveness.
Hence,
study
introduces
innovative
cement-based
water,
establishing
a
possibility
practical
applications.
Journal of Environmental Quality,
Год журнала:
2022,
Номер
52(3), С. 584 - 595
Опубликована: Дек. 17, 2022
Phosphorus
(P)
is
an
essential
element
to
produce
feed
and
fertilizers
but
also
a
nonrenewable
resource.
Both
the
predicted
exhaustion
of
phosphatic
rocks
risk
eutrophication
lead
increasing
necessity
for
P
recovery
methodologies
be
applied
in
municipal
wastewater
treatment
plants
(WWTPs).
One
most
promising
solutions
involves
precipitation
P-based
minerals
reusable
as
slow-release
fertilizers.
In
this
study,
struvite
hydroxyapatite
from
WWTP
digestate
liquid
fraction
(centrate)
was
investigated
at
varying
pH
(8-10),
reagent
typologies
(MgCl2
,
NaOH,
Ca(OH)2
CaCl2
),
concentrations
under
limiting
magnesium
doses
through
liquid-
solid-phase
analyses
thermodynamical
modeling.
A
maximum
87.3%
achieved
9
by
adding
NaOH
MgCl2
dose
656
mg/L
(the
higher
tested).
According
these
data,
it
estimated
that
92.0
tons/year
33.2
could
recovered
centrate
with
cost
consumption
being
almost
50%
mean
market
value.
An
increase
observed
while
comparing
experiments
same
values
Mg2+
dose.
Ca2+
addition
led
extensive
mainly
amorphous
phases
interfere
formation.
