16
Liqui-Cel
®
Membrane Contactors
Cleaning Guidelines
VIII. Cleaning Protocol When Particle Fouling Is Suspected
Follow the steps described in
sections VI-A
and
VII
with the following exceptions:
Backflush the cleaning solutions (i.e. introduce the cleaning solutions in the direction
opposite of the normal operating flow direction).
Once the cleaning solution is flowing into the contactor, introduce clean, dry, and oil free
compressed air into one gas port and in the same direction as the liquid flow. Valve off, or
cap, the other gas port.
Regulate the air pressure 5-10 psig GREATER than the liquid pressure, such that the air
will bubble vigorously into the cleaning solution.
At the end of the cleaning procedure, shut off the air supply first, then the liquid.
NOTICE
Avoid contact with surfactants/solvents or oxidants (e.g. ozone, chlorine) to the
hydrophobic membrane to prevent wet-out or oxidation.
Filtered, de-chlorinated, and deionized water is recommended for mixing cleaning
solutions. Water containing metals such as Mg, iron, Al, and SiO
2
may precipitate on to
the membrane surface when there is a pH shift in the water.
CAUTION
To reduce the risks associated with damaging the membrane contactor:
For all 2.5x8-inch, 4-inch and 10-inch membrane contactors, gas side pressure should
never exceed liquid side pressure during cleaning.
Do not expose the membrane to air when liquid or gas temperatures exceed 30° C.
WARNING
To reduce the risks associated with explosion:
Never exceed maximum temperature and pressure ratings. Detailed temperature and
pressure ratings can be found in the Operating Guide at
If cleaning the shellside of the membrane only, the lumenside should be open to
atmosphere.
To reduce the risks associated with chemical exposure:
Use face protection, protective gloves, and appropriate eye protection when handling
and using all cleaning chemicals.
Ensure any tubing or piping used to circulate the cleaning solution is not blocked,
kinked, frayed, cracked or obstructing flow in any way. Ensure the all tubing and piping
connections are leak-free.
Avoid splashing of chemicals while preparing cleaning solutions or during pumping of
solutions.
Cleaning procedures should be conducted using the minimal temperatures and
pressures required to clean the contactor.
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