Two
pilot-scale
two-stage
anoxic/oxic
membrane
bioreactors
were
operated
at
different
dissolved
oxygen
(DO)
levels
to
evaluate
the
nitrogen
removal
performances
for
treating
landfill
sludge
dewatering
liquid
(SDL)
via
partial
nitrification
(PN)
and
denitrification.
Compared
low
DO
system
(2.0
–
3.0
mg/L),
high
(5.0
6.0
mg/L)
exhibited
efficient
PN
denitrification,
with
nitrite
accumulation
efficiency
(98.5%)
(98.0%).
The
removed
mainly
(53.8%)
simultaneous
denitrification
(45.1%).
Kinetic
inhibition
tests
verified
optimal
pH
5.0
mg/L
8.5.
Enriched
nitrifying
(Nitrosomonas)
denitrifying
bacteria
(Thiopseudomonas,
Pseudomonas,
Truepera)
in
environment
accomplished
process.
Metagenomic
analysis
showed
that
enriched
functional
genes
such
as
amoA/B/C,
hao,
nirK/S,
while
was
unsuitable
of
ammonia
wastewater.
Processes,
Journal Year:
2024,
Volume and Issue:
12(1), P. 159 - 159
Published: Jan. 9, 2024
During
adaptation
to
waters
that
are
rich
in
xenobiotics,
biological
systems
pass
through
multiple
stages.
The
first
one
is
related
the
restructuring
of
communities,
pronounced
destruction
structure,
and
multiplication
active
biodegradants.
purpose
present
research
was
describe
microbiome
occurs
during
stage
landfill
leachate
treatment.
In
a
model
SBR
(sequencing
batch
reactor),
21-day
purification
process
simulated.
Wastewater
fed
increasing
concentrations.
When
undiluted
entered,
activated
sludge
structure
disintegrated
(Sludge
Volume
Index—4.6
mL/g).
Chemical
Oxygen
Demand
ammonium
nitrogen
concentration
remained
at
high
values
influent
(2321.11
mgO2/L
573.20
mg/L,
respectively).
A
significant
amount
free-swimming
cells
found,
number
aerobic
heterotrophs
bacteria
genera
Pseudomonas
Acinetobacter
increased
by
up
125
times.
Azoarcus-Thauera
cluster
(27%)
spp.
(16%)
were
registered
as
main
bacterial
groups
sludge.
changed
microbial
community,
Gammaproteobacteria,
family
Rhizobiaceae,
class
Saccharimonadia
predominantly
represented.
Among
suspended
bacteria,
Microbactericeae
Burkholderiaceae,
which
known
for
their
ability
degrade
larger
quantities.
enzymological
analysis
demonstrated
ortho-pathway
cleavage
aromatic
structures
community.
described
changes
leachate-purifying
community
appear
be
destructive
technological
level.
At
microbiological
level,
however,
trends
initial
clearly
outlined,
which,
if
continued,
could
provide
highly
efficient
biodegradation
