Environmental Engineering Science,
Journal Year:
2024,
Volume and Issue:
41(10), P. 401 - 412
Published: Aug. 8, 2024
Phosphorus
in
wastewater
from
pressed
vegetables
is
a
significant
contributor
to
water
pollution,
emphasizing
the
importance
of
its
removal
and
recycling
for
ecological
management.
In
this
study,
an
improved
method
coprecipitation
pyrolysis
Mg(OH)2
FeCl3•6H2O
was
used
successfully
synthesize
iron-magnesium
biochar
composite
(FeMg@BC2)
corn
cob.
Compared
with
iron-modified
(Fe@BC),
magnesium-modified
(Mg@BC),
iron–magnesium-modified
(FeMg@BC1)
prepared
by
traditional
methods,
iron–magnesium
had
higher
yield,
specific
surface
area,
crystallinity.
The
study
investigated
impact
modified
dosage,
initial
solution
pH,
coexisting
ions
on
adsorption
capabilities
phosphate
removal.
results
demonstrated
that
addition
1.0
g/L
FeMg@BC2
highly
effective
removing
simulated
when
concentration
80
mg/L,
achieving
rate
exceeding
95%.
Using
isotherm
model,
maximum
capacities
Fe@BC,
Mg@BC,
FeMg@BC1,
were
estimated
be
40.76,
46.97,
96.78,
107.97
mg/g,
respectively.
Particularly,
exhibited
superior
capacity,
mechanism
mainly
included
electrostatic
attraction,
precipitation,
ligand
exchange.
desorption
test
phosphorus-loaded
revealed
rates
vegetable
using
0.5M
NaOH
92.2%
84.8%,
After
three
cycles
wastewater,
phosphorus
efficiency
at
remained
about
50%.
Therefore,
utilization
recovery
showed
promising
potential.
Environmental Technology & Innovation,
Journal Year:
2024,
Volume and Issue:
34, P. 103631 - 103631
Published: April 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.
Currently,
the
mainstream
ammonia
nitrogen
(NH4+-N)
removal
underwent
transformation
of
intermediate
nitrogen,
which
necessitated
an
intricate
assembly
multiple
biochemical
units
with
varying
dissolved
oxygen
(DO)
settings,
even
causing
greenhouse
effect.
Ammonia
assimilation
could
directly
convert
nutrient
into
cell
components
via
microbial
capture.
However,
induction
mechanism
remained
unclear.
Herein,
we
constructed
biological
system
induced
by
synergy
limited
aeration
and
external
carbon
source.
Total
(TN)
NH4+-N
in
both
batch
continuous
flow
reactors
improved
stepwise
influent
to
(C/N)
ratio.
Under
C/N
ratio
7.8-8.1
reactor,
efficiencies
TN,
total
phosphorus
achieved
88.63%,
92.28%
100%,
respectively.
Combined
kinetics,
simultaneous
trends
source
consumption
confirmed
occurrence
assimilation.
DO
gradient
formed
significantly
suppressed
nitrobacteria,
while
further
facilitated
The
production
α-ketoglutaric
acid,
extra-
intra-cellular
proteins
verified
conversion
towards
organic
nitrogen.
Nitrogen
balance
showcased
that
TN
efficiency
79.60%
under
7.8-8.1,
accompanied
80.82%
External
was
conducive
enriching
dominant
bacteria
related
during
aeration.
functional
genes
(gdhA,
glnA
gltB)
encoding
also
increased
abundance.
had
a
potential
for
non-redox
sludge
resource
utilization
through
harvest.
As
a
critical
replenishment
source
for
depleted
phosphate
in
the
rhizosphere
soil,
colloidal
phosphorus
(Pcoll)
of
varied
sizes
has
attracted
more
research
interest;
however,
how
to
convert
Pcoll
among
subfractions
enhance
soil
P
bioavailability
remains
unclear.
In
this
study,
we
combined
variation
microbial
community,
distribution
diffusive
gradient
thin
films
(DGT)-labile
and
acid
phosphatase,
changes
four
reveal
mechanism
synergist
derived
from
plants,
improving
bioavailability.
Results
showed
that
could
be
enhanced
via
(1)
transformation
coarse-sized
(CC,
450–1000
nm)
medium-sized
(MC,
220–450
fine-sized
(FC,
20–220
nanosized
(NC,
1–20
interstitial
water
through
reductive
dissolution
by
microorganisms
release
highly
bioavailable
themselves
(2)
hydrolyzation
organic
inorganic
microorganisms.
The
rice
cultivation
experiment
treated
with
positively
affected
crop
growth.
All
above-suggested
plant-derived
provide
reliable
promising
solution
enhancing
