Short-cut
biological
nitrogen
removal
(sBNR)
favors
the
paradigm
shift
toward
energy-positive
and
carbon-neutral
wastewater
treatment
processes.
Partial
nitrification
(PN)
is
a
key
approach
to
provide
nitrite
for
anammox
or
denitritation
during
sBNR,
its
stability
precondition
achieving
robust
performance.
However,
maintaining
stable
mainstream
PN
process
has
been
long-standing
challenge.
This
review
analyzes
from
microbial
ecology
perspective,
focusing
on
niche
differentiation
among
nitrifiers.
First,
we
propose
that
systems
are
ecologically
unstable,
failure
of
due
reactivation
nitrite-oxidizing
bacteria
(NOB)
can
be
regarded
as
behavior
restore
system
stabilization.
Thus,
primarily
relies
enhancing
between
ammonia-oxidizing
(AOB)
NOB.
We
then
summarize
realized
niches
indigenous
nitrifiers
within
discuss
their
ecophysiological
characteristics
(e.g.,
cell
structure
substrate
affinity)
define
specific
ecological
niches.
By
comparing
breadths
AOB
NOB
various
axes,
further
identify
different
responses
(resistance)
(resilience)
exogenous
perturbations.
Finally,
outlook
through
an
lens.
provides
insights
into
instability
process,
which
intended
guide
derivation
optimized
strategies
single-factor
integrated
solutions.
Water Research,
Journal Year:
2024,
Volume and Issue:
257, P. 121692 - 121692
Published: April 29, 2024
Shortcut
nitrogen
removal
holds
significant
economic
appeal
for
mainstream
wastewater
treatment.
Nevertheless,
it
is
too
difficult
to
achieve
the
stable
suppression
of
nitrite-oxidizing
bacteria
(NOB),
and
simultaneously
maintain
activity
ammonia-oxidizing
(AOB).
This
study
proposes
overcome
this
challenge
by
employing
novel
acid-tolerant
AOB,
namely
"Candidatus
Nitrosoglobus",
in
a
membrane-aerated
biofilm
reactor
(MABR).
Superior
partial
nitritation
was
demonstrated
low-strength
from
two
aspects.
First,
long-term
operation
(256
days)
under
acidic
pH
range
5.0
5.2
showed
successful
NOB
washout
situ
free
nitrous
acid
(FNA)
approximately
1
mg
N/L.
evidenced
nitrite
accumulation
ratio
(NAR)
close
100
%
disappearance
shown
16S
rRNA
gene
amplicon
sequencing
fluorescence
hybridization.
Second,
oxygen
sufficiently
supplied
MABR,
leading
an
unprecedentedly
high
ammonia
oxidation
rate
(AOR)
at
2.4
±
0.1
kg
N/(m
