Membrane Disinfection and Sterilization

Major flux and rejection loss can result if the membrane elements are stored in non-sterile water. 

Recommended Sterilization/Disinfection Solutions - For Thin Film Membranes

1. 2% Sodium Bisulfite (1 week)
2. 2% Sodium Bisulfite with 20% Glycerine for long term storage
3. 0.5% Formaldehyde (use only after the membrane is in operation for at least 24 hours)
4. Chlorine Dioxide 500 PPM
5. Do NOT use Iodine, Quatenary Germicides and Phenolic Compounds

Disinfection Procedure

System or Membrane

1. Make a water solution containing 2% by weight of sodium bisulfite.
2. Flush and fill the system with this solution.
3. Drain the System as much as possible.
4. Seal the system.

Long Term Storage of Membrane Only

Either procedure will allow up to 1 year of bacterial-free storage.

Procedure

1. Make a water solution containing 2% by weight of sodium bisulfite and 20% by weight of glycerine.
2. Soak the membrane in this solution for 30 minutes.
3. Drain and seal the membrane in a plastic bag.

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