Frontiers in Microbiology,
Год журнала:
2023,
Номер
14
Опубликована: Март 9, 2023
Introduction
Pharmaceutical
wastewater
frequently
contains
high
levels
of
toxic
pollutants.
If
they
are
discharged
untreated,
pose
a
threat
to
the
environment.
The
traditional
activated
sludge
process
and
advanced
oxidation
do
not
sufficiently
remove
conventional
pollutants
from
pharmaceutical
treatment
plants
(PWWTPs).
Methods
We
designed
pilot-scale
reaction
system
reduce
organic
during
biochemical
stage.
This
included
continuous
stirred
tank
reactor
(CSTR),
microbial
electrolysis
cells
(MECs),
an
expanded
bed
(EGSB),
moving
biofilm
(MBBR).
used
this
further
investigate
benzothiazole
degradation
pathway.
Results
discussion
effectively
degraded
(benzothiazole,
pyridine,
indole,
quinoline)
chemicals
(COD,
NH
4
+
-N,
TN).
During
stable
operation
plant,
total
removal
rates
benzothiazole,
quinoline
were
97.66,
94.13,
79.69,
81.34%,
respectively.
CSTR
MECs
contributed
most
pollutants,
while
EGSB
MBBR
less
four
Benzothiazoles
can
be
via
two
pathways:
benzene
ring-opening
heterocyclic
reaction.
was
more
important
in
degrading
benzothiazoles
study.
Conclusion
study
provides
feasible
design
alternatives
for
PWWTPs
both
at
same
time.
The Science of The Total Environment,
Год журнала:
2024,
Номер
917, С. 170478 - 170478
Опубликована: Янв. 30, 2024
Denitrifying
woodchip
bioreactors
(DBRs)
are
an
established
nitrate
mitigation
technology,
but
uncertainty
remains
on
their
viability
for
phosphorus
(P)
removal
due
to
inconsistent
source-sink
behaviour
in
field
trials.
We
investigated
whether
iron
(Fe)
redox
cycling
could
be
the
missing
link
needed
explain
P
dynamics
these
systems.
A
pilot-scale
DBR
(Aotearoa
New
Zealand)
was
monitored
first
two
drainage
seasons
(2017–2018),
with
supplemental
in−field
measurements
of
reduced
solutes
(Fe2+,
HS−/H2S)
and
conjugate
oxidised
species
(Fe3+/SO42−)
made
2021
constrain
within-reactor
gradients.
Consistent
thermodynamics,
dissolution
Fe3+(s)
Fe2+(s)
within
sequentially
followed
O2,
NO3−
MnO2
reduction,
occurred
before
SO42−
reduction
H2S.
Monitoring
inlet
outlet
chemistry
revealed
tight
coupling
between
Fe
(inlet
R2
0.94,
0.85),
distinct
seasons.
In
season
one,
exceeded
(net
source),
coincided
elevated
Fe2+,
at
⁓50
%
lower
concentrations
relative
Fe:P
ratios.
2
reactor
became
a
net
sink,
coinciding
declining
Fe2+
(indicating
exhaustion
hydroxides
associated
P).
order
characterize
under
varying
source
(i.e.
autochthonous/allochthonous
P),
we
used
vs
relationship
estimate
binding
colloidal
(hydr)oxide
surfaces
oxic
conditions,
concentration
in-situ
releases
reduction.
Inferred
P-removal
rates
were
highest
early
1
(k
=
0.60
g
m3
d−1;
75–100
removal),
significantly
thereafter
0.01
±
0.02
ca.
3–67
removal).
These
calculations
suggest
that
microbiological
DBRs
can
occur
comparable
magnitudes
by
denitrification,
depending
mainly
availability
hydraulic
retention
efficiency.
Frontiers in Microbiology,
Год журнала:
2023,
Номер
14
Опубликована: Март 9, 2023
Introduction
Pharmaceutical
wastewater
frequently
contains
high
levels
of
toxic
pollutants.
If
they
are
discharged
untreated,
pose
a
threat
to
the
environment.
The
traditional
activated
sludge
process
and
advanced
oxidation
do
not
sufficiently
remove
conventional
pollutants
from
pharmaceutical
treatment
plants
(PWWTPs).
Methods
We
designed
pilot-scale
reaction
system
reduce
organic
during
biochemical
stage.
This
included
continuous
stirred
tank
reactor
(CSTR),
microbial
electrolysis
cells
(MECs),
an
expanded
bed
(EGSB),
moving
biofilm
(MBBR).
used
this
further
investigate
benzothiazole
degradation
pathway.
Results
discussion
effectively
degraded
(benzothiazole,
pyridine,
indole,
quinoline)
chemicals
(COD,
NH
4
+
-N,
TN).
During
stable
operation
plant,
total
removal
rates
benzothiazole,
quinoline
were
97.66,
94.13,
79.69,
81.34%,
respectively.
CSTR
MECs
contributed
most
pollutants,
while
EGSB
MBBR
less
four
Benzothiazoles
can
be
via
two
pathways:
benzene
ring-opening
heterocyclic
reaction.
was
more
important
in
degrading
benzothiazoles
study.
Conclusion
study
provides
feasible
design
alternatives
for
PWWTPs
both
at
same
time.
