41
Fig. : external ring with arrow marking on
OPEN position
Fig. : Opened membrane
Fig. : Washing the membrane
11.6 Membrane
The membrane performance (flow) should be checked four times a year by measuring the permeate
flow rate. Mechanical or chemical cleaning is recommended at a minimum flow rate:
Q
min
< 0.3 l/min (at 15°C) per membrane
(Kindly note, that the filtration performance is linearly dependant on the water temperature.)
11.6.1
Mechanical cleaning of the membrane
Sludge that has accumulated on the outside of the fibres
(inside the cartridge) can be mechanically washed with a jet
of water (see description below).
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 ring can be removed in the OPEN position. Then
the blue external cover is free to be removed from the top.
Attention:
a.) Do not loosen the counter nuts located at the top to open
the membrane as the assembling of the cartridge is very
difficult without specialised tools.
b.) After cleaning please check that the external ring is in the
Lock-Position!
The hollow fibres are now exposed and can be washed with
a strong water jet.
Note:
Damaged or cracked fibers are simply knotted by the client
to pass the leakage test of quality assurance. A tear in a fibres
during use undergoes a kind of self-repair as the fibers
becomes blocked and thus seals itself.
