5
Fig.
:
External
ring
with
arrow
marking
on
OPEN
position
Fig.
:
Opened
membrane
Replacing
the
filter
element:
It
is
recommended
that
the
filter
element(s)
is
cleaned
or
replaced
depending
on
running
time
and
the
surrounding
air
quality.
The
filter
element(s)
should
be
checked
every
6
months
and
should
be
replaced
every
4
years.
Detailed
information
can
be
found
in
the
separate
blower
instruction
manual
(MEDO
LA
Blower)
–
available
from
your
local
Distributor.
Replacing
the
piston
set
assembly:
It
is
suggested
that
the
Piston
Set
Assembly
is
replaced
every
24
months
or
after
20,000
h
depending
on
the
performance
of
the
blower´s
pressure
and
airflow
delivery.
There
is
a
groove
on
each
Teflon
seal
of
the
piston
indicating
the
degree
of
wear.
If
one
or
both
grooves
are
worn
away,
replacement
of
the
Piston
Set
Assembly
is
recommended.
Detailed
information
can
be
found
in
the
separate
blower
instruction
manual
which
is
included
with
the
blowers.
1.6
Membrane
1.6.1
Mechanical
cleaning
of
the
membrane
It
needs
to
be
determined,
based
on
the
amount
of
sludge
present
in
the
bottom
of
the
bioreactor,
whether
a
full
external
spray
‐
down
of
the
membranes
is
necessary
at
maintenance
time.
Check
the
sludge
level,
and
if
sludge
can
be
easily
seen,
or
measures
1cm
or
more
on
the
bottom
of
the
tank
then
the
system
should
be
shut
down,
the
membrane
station
with
membranes
attached
removed
from
the
tank,
and
the
membranes
detached
from
the
membrane
station
and
cleaned
as
described
in
this
chapter.
CAUTION:
Take
care
not
to
lose
any
of
the
O
rings
or
fibre
Washers
that
are
connected
at
each
end
of
the
membranes
Sludge
that
has
accumulated
on
the
outside
of
the
fibres
(inside
the
blue
cartridge)
can
be
mechanically
washed
with
a
jet
of
water.
The
outer
ring
is
rotated
from
the
LOCK
position
to
the
OPEN
position
(counter
clockwise)
to
open
the
cartridge.
The
grey
underside
of
the
membrane
must
be
held
secure.
The
outer
grey
ring
can
be
removed
in
the
OPEN
position.
Then
the
blue
external
cover
is
free
to
be
removed
from
the
top.
