SSRN Electronic Journal,
Год журнала:
2022,
Номер
unknown
Опубликована: Янв. 1, 2022
Three
aerobic
denitrifying
fungi
named
Trichoderma
viridans
D4,
Penicillium
brasiliensis
D6
and
Fusarium
solani
D7
were
isolated.
Meanwhile,
the
nitrate
removal
characteristics
(89.93%,
89.92%,
87.76%)
optimal
denitrification
conditions
of
three
strains
evaluated.
Besides,
activity
electron
transport
system
intracellular
ATP
concentration
results
showed
that
performance
combined
with
biodegradable
material
under
low
C/N
was
enhanced
significantly.
Finally,
highest
efficiency
nitrate-nitrogen
in
landscape
water
by
all
greater
than
80%
Excitation-Emission-Matrix
Spectra
demonstrated
excellent
organic
matters
water,
especially
aromatic
protein
humic
acid.
This
study
provides
new
insights
into
possibility
treating
micro-polluted
future.
Environmental Science & Technology,
Год журнала:
2023,
Номер
58(1), С. 683 - 694
Опубликована: Дек. 15, 2023
The
coculture
theory
that
promotes
denitrification
relies
on
effectively
utilizing
the
resources
of
low-efficiency
microbes.
Here,
strains
Streptomyces
sp.
PYX97
and
TSJ96
were
isolated
showed
lower
capacity
when
cultured
individually.
However,
enhanced
nitrogen
removal
(removed
96.40%
total
nitrogen)
organic
carbon
reduction
92.13%
dissolved
carbon)
under
aerobic
conditions.
Nitrogen
balance
analysis
indicated
coculturing
efficiency
nitrate
converted
into
gaseous
reaching
70.42%.
Meanwhile,
promoted
cell
metabolism
source
metabolic
activity.
thrived
in
conditions
C/N
=
10,
alkalescence,
150
rpm
shaking
speed.
reduced
CODMn
raw
water
treatment
by
83.32
84.21%,
respectively.
During
this
treatment,
activity
density
increased
reactor.
Moreover,
could
utilize
aromatic
protein
soluble
microbial
products
during
processes
treatment.
This
study
suggests
inefficient
actinomycete
be
a
promising
approach
for
treating
polluted
bodies.
Water,
Год журнала:
2024,
Номер
16(14), С. 1993 - 1993
Опубликована: Июль 14, 2024
Heterotrophic
nitrification-aerobic
denitrification
(HN-AD)
bacteria
are
the
key
functional
microorganisms
needed
to
achieve
simultaneous
nitrification
and
(SND).
In
this
study,
25
strains
of
HN-AD
were
successfully
isolated
from
a
stable
landfill
leachate
biochemical
treatment
system,
which
10
belonged
Firmicutes
15
Proteobacteria.
Bacillus
subtilis
F4
Alcaligenes
faecalis
P4
displayed
good
tolerance
at
wide
range
ammonia
nitrogen
(NH4+-N)
concentrations.
When
C/N
ratio
was
20,
removal
rates
90.1%
89.5%,
chemical
oxygen
demand
(COD)
92.4%
93.9%,
respectively.
The
napA
gene
encoding
periplasmic
nitrate
reductase
(Nap)
nirS
nitrite
(Nir)
detected,
balance
showed
assimilation
main
metabolism
mode
in
both
strains.
use
immobilization
materials
could
increase
rate
by
21.1%
29.6%,
research
results
work
can
provide
theoretical
basis
technical
support
for
practical
application
enhance
high
wastewater
with
efficiency
low
consumption.
Biogeochemistry,
Год журнала:
2024,
Номер
167(9), С. 1123 - 1137
Опубликована: Июль 13, 2024
Abstract
The
large
leakage
accidents
of
heavy
metals
from
industrial
facilities
pose
a
serious
environmental
problem;
however,
not
enough
studies
have
been
conducted
to
assess
the
long-term
ecological
risk
associated
with
such
accidents.
This
study
evaluated
changes
in
bacterial
communities
within
river
sediment
and
identified
key
functional
microorganisms
responding
2012
cadmium
contamination
incident
Long
River,
Guangxi
Province,
China.
Results
revealed
that
after
prolonged
period
pollution
accidents,
still
had
discernible
effect
on
sediment.
In
comparison
control
site
(S1),
α-diversity
sediments
accident
area
(S3)
its
downstream
(S5)
showed
significant
increase
following
incident.
site,
Burkholderiaceae
was
dominant,
while
S3
S5,
Pedosphaeraceae
,
Nitrosomonadaceae
Nitrospiraceae
Geobacteraceae
were
significantly
increased.
Sulfur
bacteria
found
be
more
responsive
this
than
other
bacteria.
At
S3,
abundances
Sulfuricurvum
Sulfurifustis
Thioalkalispira
Desulfobacteraceae
Desulfarculaceae
hundreds
times
higher
at
S1,
indicating
an
intensification
sulfur
cycling
processes.
prediction
implied
may
promote
methane
oxidation
coupled
sulfate
reduction
reactions
altered
processes
nitrification
denitrification.
Environmental
factors
influencing
microbial
community
included
levels
(cadmium,
arsenic,
iron)
sediment,
as
well
characteristics
like
temperature
electrical
conductivity.
These
findings
contribute
our
understanding
consequences
ecosystems.
Graphical
abstract
