New prototype for the treatment of falling film liquid effluents by gliding arc discharge part I: Application to the discoloration and degradation of anthraquinonic Acid Green 25
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Journal Title
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Publisher
Chemical Engineering and Processing: Process Intensification
Abstract
Gliding
arc
discharge
(GAD)
reactors
are
continuously
in
progress
in
order
to
improve
the
treatment
efficiency
of
recalcitrant
compounds.
However,
up
to
now,
they
remain
difficult
to
transfer
to
industrial
applications
because
of
some
technical
constraints
in
their
design.
In
this
study,
a
new
efficient
pro-
totype
is
proposed
for
the
treatment
of
gravity
falling
film
shaped
of
liquid
effluents.
The
liquid
flow
rate
is
now
continuous
as
the
tank
containing
the
solution
to
be
treated
is
replaced
by
an
inclined
plate
along
which
flows
the
liquid.
The
various
working
parameters
are
optimized
and
the
new
prototype
efficiency
is
tested
on
discolouration
and
degradation
of
the
anthraquinonique
Acid
Green
25.
The
opti-
mized
values
obtained
are:
the
liquid
flow
rate
ω
=
1
L
h
−
1
,
the
plate
tilt
angle
̨
=
45
◦
and
the
channel
width
=
3
mm.
The
rates
of
discolouration
and
degradation
reach
95%
and
90%
respectively
after
12
cycles
(180
min)
of
plasma
exposition.
The
GAD
in
the
presence
of
humid
air
generates
highly
oxidizing
radical
species
such
as
•
OH
with
a
standard
potential
E
◦
[(
•
OH/H
2
O)
=
2.85
V/SHE]
and
its
reducer
agent
H
2
O
2
[
E
◦
(H
2
O
2
/H
2
O)
=
1.68
V/SHE.