Water,
Journal Year:
2022,
Volume and Issue:
14(15), P. 2438 - 2438
Published: Aug. 6, 2022
Due
to
its
high
content
of
organics
and
nutrients,
swine
wastewater
has
become
one
the
main
environment
pollution
sources.
Exploring
high-efficient
technologies
for
treatment
is
urgent
becoming
a
hot
topic
in
recent
years.
The
present
study
introduces
anaerobic
membrane
bioreactor
(AnMBR)
efficient
wastewater,
compared
with
up-flow
sludge
blanket
(UASB)
as
traditional
system.
Pollutant
removal
performance,
methanogenic
properties,
microbial
community
structures
were
investigated
both
reactors.
Results
showed
that
by
intercepting
particulate
organics,
AnMBR
achieved
stable
much
higher
chemical
oxygen
demand
(COD)
rate
(approximately
90%)
than
UASB
(around
60%).
activity
sludge,
methane
yield
(0.23
L/g-COD)
was
UASB.
Microbial
structure
analysis
enrichment
functional
bacteria
can
remove
refractory
organic
matter
AnMBR,
which
promoted
conversion
processes.
In
addition,
obvious
accumulation
acetotrophic
hydrotrophic
methanogens
system
recorded,
could
broaden
degradation
pathways
methanogenesis
processes,
ensuring
yield.
Through
energy
balance
analysis,
results
concluded
net
recovery
efficiency
system,
indicating
applying
livestock
not
only
efficiently
pollutants,
but
also
significantly
enhance
recovery.
Environmental Technology & Innovation,
Journal Year:
2023,
Volume and Issue:
30, P. 103030 - 103030
Published: Jan. 30, 2023
The
struvite
method
has
been
widely
used
to
recover
N
and
P
from
wastewater.
However,
the
drawbacks
of
alkali
consumption
small
crystallization
are
not
negligible.
Therefore,
alkaline
porous
carrier
materials
greatly
desired
enhance
crystalline
precipitation
maintain
suitable
pH
values.
In
this
study,
using
red
mud
(RM)
as
a
carrier,
MgO
was
loaded
onto
RM
by
co-precipitation
prepare
an
recovery
material
(MgO–RM).
A
response
surface
methodology
based
on
Box–Behnken
design
explore
effects
factors
recovery.
multi-objective
optimization
process
carried
out
desirability
function
approach
achieve
economically
feasible
Characterizations,
including
SEM-EDS,
BET,
FTIR,
XRD,
XPS,
were
mechanism.
results
demonstrated
that
nano-sized
well
deposited
surface,
resulting
in
larger
specific
area
greater
reactivity
MgO–RM.
Using
significantly
increased
crystal
size,
MgO–RM
could
value
solution
range
for
growth.
Under
optimal
conditions
(dosage
=
3.5
g/L,
N/P
1.8,
3.4),
maximum
capacity
57.23
mg/g
128.05
mg/g.
may
involve
coupled
reactions
between
physical
adsorption,
ion
exchange,
coordination
chemical
precipitation.
Struvite
produced
is
main
Water Science & Technology,
Journal Year:
2022,
Volume and Issue:
86(10), P. 2627 - 2641
Published: Oct. 28, 2022
Digestive
slurry
normally
contains
various
nutrient
ions
with
high
concentrations,
including
NH4+,
PO43-,
K+,
Mg2+,
Ca2+
and
SO42-,
which
is
a
resource
pool
for
recovery.
In
this
study,
synchronously
cationic
anionic
selective
electrodialysis
(SCAE)
was
developed
to
recover
ions.
Results
showed
that
SCAE
could
more
than
85.0%,
90.2%
97.8%
of
SO42-
other
cations
(including
Ca2+,
Mg2+)
from
the
simulated
digestive
slurry,
respectively.
The
ionic
permeation
sequence,
NH4+
>
K+
Mg2+
cations,
PO43-
anions,
affected
by
hydrated
radius
hydration
numbers,
did
not
alter
despite
variation
in
electric
field.
High
electrolyte
concentration
product
streams
would
promote
recovery
efficiency
both
divalent
anions
due
replacement
effect
demand
charge
neutrality.
Under
continuous
operation,
maximum
concentrations
reached
231.9,
496.6,
180.7,
604.3,
9,648.4
4,571.4
mg·L-1,
By
directly
mixing
different
streams,
feasibility
producing
mineral
fertilizers
without
dosing
externally
precipitating
chemicals
proved.
Struvite,
NH4HSO4
potassium
chloride
minerals
were
produced
successfully.
outcome
provided
an
optional
method
wastewater.
