Water,
Journal Year:
2024,
Volume and Issue:
16(24), P. 3666 - 3666
Published: Dec. 19, 2024
The
efficacy
of
zero-valent
iron
(ZVI)
for
the
simultaneous
nitrification
denitrification
and
phosphorus
removal
(SNDPR)
process
is
unclear,
although
it
has
been
shown
in
numerous
studies
to
help
improve
nitrate
biological
wastewater
treatment
systems.
This
study
investigated
response
SNDPR
ZVI
addition
an
anaerobic/aerobic/anoxic
(An/O/A)-sequencing
batch
reactor
(SBR).
results
indicated
that
could
promote
total
inorganic
nitrogen
(TIN).
by
was
mainly
attributed
precipitation
due
situ
oxidation
oxygen
or
nitrate.
TIN
chemical
reaction,
which
reduces
nitrite
gas.
nanoscale
(nZVI)
more
favorable
than
microscale
(mZVI)
process.
average
efficiency
PO43−-P
increased
from
50.37
±
7.55%
99.29
1.24%
73.15
5.92%
76.75
5.05%
with
nZVI
addition.
relative
abundance
Dechloromonas
sp.
decreased
0.65%
Nitrospira
3.78%
ZVI,
indicating
weaken
activity
polyphosphate-accumulating
organisms
(PAOs)
nitrite-oxidizing
bacteria.
These
provide
a
new
environmentally
friendly
approach
applying
systems,
reducing
dependence
on
organic
carbon
sources.
Water Science & Technology,
Journal Year:
2024,
Volume and Issue:
90(5), P. 1629 - 1646
Published: Aug. 14, 2024
ABSTRACT
As
China's
economy
grows
rapidly,
there
is
a
growing
problem
of
rural
water
pollution,
particularly
regarding
black
and
odorous
bodies.
However,
the
current
treatment
technologies
have
proven
inadequate
in
both
nitrogen
phosphorus
removal,
primarily
due
to
insufficient
carbon-to-nitrogen
ratio
these
bodies,
resulting
low
removal
efficiency.
To
address
this
challenge,
study
proposes
novel
process,
namely
‘aeration
+
sulfur-iron
autotrophic
denitrification
MBBR’.
This
innovative
approach
was
compared
with
traditional
MBBR’
process
blank
control
group
over
an
18-day
experimental
period.
Ten
quality
indicators
were
monitored
compared,
including
odor,
turbidity,
DO,
pH,
COD,
BOD5,
NH3-N,
NO3-N,
TN,
TP.
The
results
revealed
satisfactory
performance
processes
terms
NH3-N
indicators.
significant
disparities
observed
new
achieving
rates
85.65
78.02%,
respectively,
−2.30
−4.05%
for
existing
process.
Furthermore,
met
surface
class
IV
standard
all
10
indicators,
indicating
its
potential
effectively
addressing
issue
China.
