A
simulated
textile
wastewater
containing
the
azo
dye
AR14
was
supplied
to
two
anaerobic/aerobic
SBR
systems,
one
inoculated
with
activated
sludge
flocs
and
the
other
with
aerobic
granules.
The
flocculent
SBR
system
operated
in
8-h
cycles
but
this
dura
tion
could
be
reduced
to
6
h
in
the
granular
system,
mainly
due
to
the
excellent
settling
properties
of
the
aerobic
granules.
After
around
40
days
of
operation
with
a
SRT
of
15
days,
the
mixed
liquor
of
the
flocculent
SBR
(FSBR1
and
FSBR2)
reached
a
TSS
content
of
5
g
L−1.
In
the
granular
SBR
(GSBR1
and
GSBR2),
the
dense
and
fast
settling
aerobic
granules
progressively
accumulated
in
both
SBR,
reaching
a
TSS
content
of
13
g
L−1 with
negligible
biomass
washout
levels.
Consequently,
SRT
values
higher
than
30
days
were
attained
in
the
granular
SBR.
A
comparison
between
the
overall
dissolved
COD
removal
yields
of
the
four
SBR
during
41
days
of
operation
is
presented
in
Fig.
1
The
total
dissolved
COD
removal
yields
attained
in
FSBR1
and
GSBR1
were
similar
to
those
observed
in
the
corresponding
dye
free
controls,
FSBR2
and
GSBR2,
respectively,
suggesting
that
the
presence
of
the
azo
dye
did
not
affect
the
overall
COD
removal
in
the
flocculent
or
in
the
granular
systems.
However,
higher
COD
0
20
40
60
80
100
0
5
10
15
20
25
30
35
40
45
COD removal (%)
Time
(d)
FSBR1
A
simulated
textile
wastewater
containing
the
azo
dye
AR14
was
supplied
to
two
anaerobic/aerobic
SBR
systems,
one
inoculated
with
activated
sludge
flocs
and
the
other
with
aerobic
granules.
The
flocculent
SBR
system
operated
in
8-h
cycles
but
this
dura
tion
could
be
reduced
to
6
h
in
the
granular
system,
mainly
due
to
the
excellent
settling
properties
of
the
aerobic
granules.
After
around
40
days
of
operation
with
a
SRT
of
15
days,
the
mixed
liquor
of
the
flocculent
SBR
(FSBR1
and
FSBR2)
reached
a
TSS
content
of
5
g
L−1.
In
the
granular
SBR
(GSBR1
and
GSBR2),
the
dense
and
fast
settling
aerobic
granules
progressively
accumulated
in
both
SBR,
reaching
a
TSS
content
of
13
g
L−1 with
negligible
biomass
washout
levels.
Consequently,
SRT
values
higher
than
30
days
were
attained
in
the
granular
SBR.
A
comparison
between
the
overall
dissolved
COD
removal
yields
of
the
four
SBR
during
41
days
of
operation
is
presented
in
Fig.
1
The
total
dissolved
COD
removal
yields
attained
in
FSBR1
and
GSBR1
were
similar
to
those
observed
in
the
corresponding
dye
free
controls,
FSBR2
and
GSBR2,
respectively,
suggesting
that
the
presence
of
the
azo
dye
did
not
affect
the
overall
COD
removal
in
the
flocculent
or
in
the
granular
systems.
However,
higher
COD
0
20
40
60
80
100
0
5
10
15
20
25
30
35
40
45
COD การกำจัด (%)
เวลา
(ง)
FSBR1
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