Solid-phase
denitrification
(SPD)
is
a
promising
approach
for
treating
recirculating
mariculture
systems
(RMS)
water,
but
its
relatively
slow
nitrate
removal
rate
presents
challenge.
This
study,
the
first
time,
investigates
enhanced
in
SPD
process
by
rhamnolipid
(RL)
addition.
The
enhancement
RL
addition
(20
and
40
mg
L-1)
was
significant
largely
persisted
even
after
dosing
stopped.
Specifically,
RL-assisted
reactors
1.7–2.6
1.9–2.1
times
influent
NO3--N
concentrations
of
100
200
L-1,
respectively.
attributed
to
improved
biofilm
formation,
as
indicated
increased
contents
biomass
extracellular
polymeric
substances.
Moreover,
abundances
formation
functional
bacteria
(Pseudomonas
Denitromonas)
also
increased.
genes
involved
carbon
degradation
removal.
assimilatory
reduction
pathways
achieved
together.
Therefore,
novel
strategy
nitrate-rich
RMS
water.
Environmental Science & Technology,
Год журнала:
2023,
Номер
57(30), С. 11122 - 11133
Опубликована: Июль 18, 2023
Biodenitrification
plays
a
vital
role
in
the
remediation
of
nitrogen-contaminated
water.
However,
influent
with
low
C/N
ratio
limits
efficiency
denitrification
and
causes
accumulation/emission
noxious
intermediates.
In
this
study,
β-cyclodextrin-functionalized
biochar
(BC@β-CD)
was
synthesized
applied
to
promote
performance
Paracoccus
denitrificans
when
only
4,
accompanied
by
increased
nitrate
reduction
lower
nitrite
accumulation
nitrous
oxide
emission.
Transcriptomic
enzymatic
activity
analyses
showed
BC@β-CD
enhanced
glucose
degradation
promoting
activities
glycolysis
(EMP),
pentose
phosphate
pathway
(PPP),
tricarboxylic
acid
(TCA)
cycle.
Notably,
drove
great
generation
electron
donors
stimulating
TCA
cycle,
causing
greater
supply
substrate
metabolism
denitrification.
Meanwhile,
promotional
effect
on
oxidative
phosphorylation
accelerates
transfer
ATP
synthesis.
Moreover,
presence
intracellular
iron
level,
further
improved
utilization
helped
remove
metabolites
induced
positive
feedback
P.
denitrificans.
Collectively,
these
effects
elevated
for
supporting
from
36.37%
51.19%.
This
study
reveals
potential
enhancing
under
conditions
illustrates
application
approach
β-CD
wastewater
bioremediation.
ACS ES&T Water,
Год журнала:
2023,
Номер
4(1), С. 8 - 19
Опубликована: Дек. 6, 2023
Biodegradable
plastics
have
emerged
as
reliable
alternatives
to
conventional
for
alleviating
global
plastic
pollution.
However,
biodegradable
could
also
rupture
into
microplastics
and
inevitably
accumulate
in
wastewater
treatment
plants
(WWTPs).
The
fate
effects
of
(BMPs)
sludge
disposal
processes
are
great
concern
but
not
yet
been
reviewed.
This
review
comprehensively
expounded
the
occurrence,
fate,
consequential
BMPs
WWTPs.
Specifically,
environmental
contents
corresponding
detection
techniques
were
analyzed
compared
with
microplastics.
Furthermore,
mechanical
aging,
additive
release,
extracellular
hydrolysis,
microbial
biotransformation
documented
meticulously.
Also,
on
community
structure
function,
well
pollutant
adsorption,
underscored.
obtained
knowledge
would
update
our
understanding
risk
control
Recommendations
future
investigations
made.
