The
enhanced
biological
phosphorus
removal
(EBPR)
process
requires
alternate
anaerobic
and
aerobic
conditions,
which
are
regulated
respectively
by
aeration
off
on.
Recently,
in
an
ordinary
EBPR
reactor,
abnormal
orthophosphate
concentration
(PO43--P)
decline
the
stage
(namely
non-aerated
uptake)
aroused
attention.
It
was
not
occasionally
but
occurred
each
cycle
lasted
for
101
days,
shared
about
16.63%
total
P
uptake
amount.
After
excluding
bio-mineralization
surface
re-aeration,
indoor
light
conditions
(180-260
lux)
inducing
confirmed.
High-throughput
sequencing
analysis
revealed
that
cyanobacteria
could
produce
oxygen
via
photosynthesis,
inhabited
on
inside
wall
biofilm.
were
incubated
a
feeding
transparent
silicone
hose,
entered
reactor
along
with
influent,
outcompeted
Chlorophyta,
existed
inoculum.
Besides,
cooperation
of
microalgal-bacterial
biofilm-sludge
proposed
to
reduce
CO2
emissions
energy
consumption.
Water,
Journal Year:
2023,
Volume and Issue:
15(16), P. 2977 - 2977
Published: Aug. 18, 2023
This
study
aimed
at
investigating
the
potential
impacts
of
perfluorooctanoic
acid
(PFOA)
exposure
on
partial
denitrification
(PD)
system.
Our
results
indicated
that
nitrite
accumulation
rates
were
significantly
decreased
to
67.94
±
1.25%–69.52
3.13%
after
long-term
PFOA
(0.5–20
mg/L),
while
nitrate
transformation
ratio
was
slightly
impacted.
The
removal
efficiency
gradually
from
67.42
3.39%
6.56
5.25%
with
an
increasing
dosage,
indicating
main
pathway
biosorption.
average
EPS
contents
increased
by
two
folds,
which
suggested
stimulated
secretion.
Excitation
emission
matrix
analysis
revealed
promoted
secretion
tryptophan
protein-like,
humic
acid-like,
and
aromatic
protein
II-like
substances,
may
act
as
a
protective
barrier
against
toxicity.
Moreover,
significant
changes
in
characteristic
peaks
shown
Fourier
transform
infrared
spectroscopy.
High-throughput
sequencing
bacterial
richness
evenness,
toxicity
effects
more
pronounced
for
abundant
species
(e.g.,
Thauera)
than
rare
species.
Thauera
most
dominant
genus
responsible
accumulation,
whose
abundance
35.99
2.67%
18.60
2.18%
exposure.
In
comparison,
abundances
common
denitrifiers,
such
Denitratisoma,
Bdellovibrio,
OLB8,
increased,
suggesting
these
genera
PFOA-resistant
bacteria.
presents
new
insights
into
effect
PD
The
practical
application
of
anammox
is
complicated
by
strict
influent
NO2--N
to
NH4+-N
ratio
demands
and
an
11%
nitrate
production
from
the
process.
Zeolite
adsorption
biological
desorption
ammonium
contributed
robust
nitrogen
removal
under
fluctuating
ratios,
with
ultra-high
efficiency
(NRE,
93.0
±
2.0%).
Applying
16S
rRNA
gene
sequencing
found
that
Candidatus
Brocadia
Thauera
were
key
bacteria
responsible
for
partial
denitrification
(PD),
respectively.
significantly
enriched
a
higher
relative
abundance
Brocadia,
reaching
49.2%.
Metagenomic
analysis
demonstrated
multiple
functional
genes
related
(nrfA/H,
narG/H/I)
metabolic
pathways
ensured
resilience
Z-PDA
system
despite
fluctuations.
Overall,
this
study
provided
novel
insights
into
impacts
zeolite
in
PDA
system.
Water,
Journal Year:
2024,
Volume and Issue:
16(21), P. 3040 - 3040
Published: Oct. 23, 2024
In
order
to
investigate
the
enhancement
mechanism
of
modified
three-dimensional
elastic
filler
(MTEF)
on
nitrogen
removal
performance
integrated
fixed-film
activated
sludge
(IFAS)
process,
and
clarify
interactions
between
competition
synergy
biofilm
in
IFAS
system,
an
reactor
(T2)
filled
with
MTEF
was
employed
for
study,
while
a
sequencing
batch
process
(SBR)
(T1)
utilized
comparison.
SBR
reactors
were
operated
over
extended
period
at
ambient
temperature
assess
pollutant
addition
competitive
dynamics
under
varying
influent
water
qualities
(C/N,
N/P,
organic
loading),
analyze
synergistic
relationship
microbial
level
using
high-throughput
technology.
The
results
demonstrate
that
throughout
entire
operational
phase,
T2
exhibited
superior
efficiency.
Compared
T1,
achieved
average
increase
rates
COD,
ammonia
nitrogen,
total
by
13.07%,
12.26%,
28.96%,
respectively.
findings
indicate
nitrification
volumetric
load
system
is
significantly
higher
than
pure
suggesting
possesses
enhanced
capabilities.
Furthermore,
when
dealing
wastewater
characterized
low
C/N
ratios
high
phosphorus
pollution,
or
substantial
loads,
holds
edge
exhibits
improved
stability.
High-throughput
data
reveal
community
structures
can
influence
each
other,
thereby
enabling
effectively
enrich
denitrification-related
functional
populations.
Additionally,
has
certain
enhancing
effect
expression
levels
metabolism-related
genes
phase
microorganisms,
indicating
that,
interactions,
there
also
sludge.
