Water Environment Research,
Год журнала:
2024,
Номер
96(6)
Опубликована: Июнь 1, 2024
Abstract
Nitrate
poses
a
potential
threat
to
aquatic
ecosystems.
This
study
focuses
on
the
sulfur
autotrophic
denitrification
mechanism
in
process
of
water
culture
wastewater
treatment,
which
has
been
successfully
applied
degradation
nitrogen
farm
effluents.
However,
coexistence
organic
acids
treatment
is
common
environmental
challenge,
significantly
affecting
activity
denitrifying
bacteria.
paper
aims
explore
effects
adding
benzoic
acid
and
lactic
performance,
removal
rate,
microbial
population
abundance
systems
under
optimal
operating
conditions,
deficiency,
high
hydraulic
load.
In
experiments
with
50
mg·L
−1
or
alone,
results
show
that
have
stimulating
effect
activity,
greater
than
inhibitory
effect.
Under
average
rate
system
remained
above
99%;
S/N
=
1.5
increased
from
88.34%
91.93%
85.91%;
HRT
6
h
75.25%
97.79%
96.58%.
addition,
addition
led
decrease
abundance.
At
phylum
level,
Proteobacteria
always
dominant
bacterial
genus,
its
relative
after
acid,
40.2%
61.5%
62.4%.
genus
Thiobacillus
,
Sulfurimonas
Chryseobacterium
Thermomonas
maintained
abundances
different
conditions.
Practitioner
Points
Employing
for
treating
high‐nitrate
wastewater.
Utilizing
as
external
carbon
sources.
Denitrifying
bacteria
demonstrate
utilization
efficiency
towards
acids.
Organic
promote
more
they
inhibit
it.
The
promotion
manifested
enhancement
Desalination and Water Treatment,
Год журнала:
2024,
Номер
317, С. 100199 - 100199
Опубликована: Янв. 1, 2024
Nitrate
pollution
in
water
and
wastewater
has
become
a
significant
environmental
concern.
Presently,
thorough
research
was
needed
on
the
sulfur
autotrophic
denitrification
(SADN)
process
for
removal
of
nitrate
(NO3--N)
from
characterized
by
deficiency
carbon-to-nitrogen
(C/N)
ratio.
Therefore,
this
study
utilized
thiosulfate
as
an
electron
donor,
to
investigate
sulfur-based
reactor
performance,
community,
kinetics
behavior.
The
findings
demonstrated
that
molar
ratio
sulfur-to-nitrogen
(S/N)
2.19
provided
enough
donors
complete
denitrification.
However,
selectively
reduced,
accumulating
nitrite
S/N
1.88.
Furthermore,
maximum
specific
reduction
rate
(SNaRR)
14.50
mg
NO3--N/g
VSS.hr
at
pH
7
optimal
Denitrification
efficiency
limited
<
6
or
>
8,
with
SNaRR
values
1.66
2.8
5
9,
respectively.
Moreover,
highest
achieved
under
anoxic
conditions
dissolved
oxygen
(DO)
0
mg/L.
effect
severely
inhibited
microaerobic
(DO
=
1
mg/L)
aerobic
3
conditions.
Also,
accumulation
served
appropriate
indicator
(SADN).
Water,
Год журнала:
2024,
Номер
16(5), С. 690 - 690
Опубликована: Фев. 27, 2024
To
solve
the
problems
of
deep
nitrogen
removal
in
wastewater
treatment
plants
and
high
value
utilization
steel
slag
metallurgical
industry,
this
work
aims
to
prepare
a
sulfur/steel
slag-based
filter
using
melting
method.
The
melt
granulation
method
waste
were
main
innovations
work.
On
basis,
performance
media
simulated
actual
systematically
investigated.
Furthermore,
factors
affecting
studied,
pilot
experiments
carried
out.
microbial
community
reactor
was
also
analyzed.
results
showed
that
when
mass
ratio
sulfur
9:1,
could
remove
up
90%
TN
at
room
temperature,
with
hydraulic
retention
time
(HRT)
5–20
h
an
influent
21
mg/L.
In
wastewater,
effluent
NO3−-N
less
than
2
mg/L,
SO42−
200
pH
between
6
8.
from
greater
temperature
under
8–20
8
Influence
factor
conducted
C/N
2:1,
DO
0.9–1
HRT
4
h.
experiment
confirmed
stable
below
10
compounded
for
practical
engineering
applications.
Microbial
analysis
autotrophic
denitrifying
bacterial
species
Thiobacillus
accounted
3.69%
5.55%
systems,
respectively.
This
provides
novel
strategy
application
solid
field
nitrate-containing
treatment.
