Water,
Год журнала:
2024,
Номер
16(9), С. 1277 - 1277
Опубликована: Апрель 29, 2024
When
treating
municipal
wastewater,
nitrogen
removal
is
often
limited
due
to
low
C/N,
which
needs
be
compensated
for
by
additional
carbon
source
injections.
This
study
investigated
the
feasibility
of
using
industrial-waste
polyglycolic
acid
(PGA)
as
a
denitrification
in
an
SBR
obtain
economical
source.
The
results
revealed
that
optimal
performance
methanol-fed
activated
sludge
system
was
achieved
with
PGA
dosage
1.2
mL/L,
pH
7–8,
and
dissolved-oxygen
(DO)
concentration
3
±
0.5
mg/L.
Under
these
conditions,
all
quality
parameters
effluent
water
met
required
criteria
[COD
<
50
mg/L;
TN
15
NH4+-N
5(8)
mg/L].
enhanced
variety
richness
microbial
communities,
thereby
markedly
increasing
relative
abundance
major
phyla
such
Proteobacteria
Bacteroidota
genera
Paracoccus
Dechloromonas.
Furthermore,
upregulated
expression
nitrogen-metabolism-related
genera,
including
amo,
hao,
nar,
nor,
improved
system.
provides
reference
applying
low-C/N-wastewater
treatment
solid-waste
utilization.
Environmental Science & Technology,
Год журнала:
2024,
Номер
58(23), С. 10149 - 10161
Опубликована: Май 29, 2024
Further
reducing
total
nitrogen
(TN)
and
phosphorus
(TP)
in
the
secondary
effluent
needs
to
be
realized
effectively
an
eco-friendly
manner.
Herein,
four
pyrite/sawdust
composite-based
biofilters
were
established
treat
simulated
for
304
days.
The
results
demonstrated
that
TN
TP
concentrations
from
under
optimal
hydraulic
retention
time
(HRT)
of
3.5
h
stable
at
<2.0
0.1
mg/L,
respectively,
no
significant
differences
observed
between
inoculated
sludge
sources.
had
low
N2O,
CH4,
CO2
emissions,
effluent's
DOM
was
mainly
composed
five
fluorescence
components.
Moreover,
mixotrophic
denitrifiers
(Thiothrix)
sulfate-reducing
bacteria
(Desulfosporosinus)
contributing
microbial
sulfur
cycles
enriched
biofilm.
Co-occurrence
network
analysis
deciphered
Chlorobaculum
Desulfobacterales
key
genera,
which
formed
obvious
cycle
process
strengthened
denitrification
capacity.
higher
abundances
genes
encoding
extracellular
electron
transport
(EET)
chains/mediators
revealed
pyrite
not
only
functioned
as
conduit
stimulate
direct
interspecies
transfer
by
flagella
but
also
facilitated
EET-associated
enzymes
denitrification.
This
study
comprehensively
evaluates
water–gas–biofilm
phases
during
a
long-term
study,
providing
in-depth
understanding
boosted
pyrite-based
systems.
Microorganisms,
Год журнала:
2025,
Номер
13(2), С. 297 - 297
Опубликована: Янв. 29, 2025
In
this
study,
a
novel
strain
exhibiting
heterotrophic
nitrification
was
screened;
subsequently,
the
identified
as
Klebsiella
pneumoniae
LCU1
using
16S
rRNA
gene
sequencing.
The
aim
of
study
to
investigate
effects
external
factors
on
NH4+-N
removal
efficiency
in
order
elucidate
optimal
conditions
for
by
and
improve
efficiency.
findings
indicated
that
exceeded
80%
under
(sodium
succinate
carbon
source,
C/N
ratio
10,
initial
pH
8.0,
temperature
30
°C,
speed
180
rpm).
genome
analysis
showed
key
genes
involved
nitrogen
metabolism,
including
narGHI,
nirB,
nxrAB,
nasAB,
were
successfully
annotated;
hao
amo
absent,
but
properties
determined
had
ability.
After
120
h,
34.5%
at
high
concentration
2000
mg/L.
More
importantly,
above
34.13%
higher
Cu2+,
Mn2+,
Zn2+
ion
concentrations.
Furthermore,
highest
34.51%
unsterilised
(LCU1-OC)
aquaculture
wastewater.
This
suggests
with
intensive
colonisation
treatment,
has
promising
application
potential
real
wastewater
treatment.
