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8-3
Procedure for Long-term Storage of Used Modules
Store modules used in the MBR system in a wet condition if they are to be stored for a long period of time.
Fouling substances remain on the surface of hollow fiber membranes even if they have been washed with
clean water and appear clean. If the module is then dried and stored, sludge and fouling substances will
harden and become fixed to the membrane surface like a mud cake, and will become clogged easily when
it is used again. Fouling substances which have hardened may not easily soften, and may not be fully
removed by chemical cleaning.
Follow the following procedure when storing modules in a wet condition for a long period of time.
1.
Remove the module from the tank and wash it with water. Then perform chemical soak
cleaning.
2.
After chemical soak cleaning, fill a tank with tap water (or any water of comparable quality)
and immerse the module in it. Store the module in a cool dark place not exposed to direct
sunlight.
3.
When storing a module for a long period of time, change water 1 to 4 times a month to
prevent microorganisms from multiplying in the water and causing putrefaction. Take care
not to let water in the tank freeze in cold locations.
4.
When a stored module is to be used again, perform chemical soak cleaning on it with
approx. 3,000 mg/L NaClO outside the system. The modules must be cleaned as
microorganisms may have adhered to the surface of the elements. The cleaning procedure
is the same as that for normal chemical cleaning.
C AUT IO N
Drying an element once used may reduce its hydrophilicity and cause a significant rise in
trans membrane pressure. In this case, it must be rehydrophilized before it is reused.
Contact our staff for details regarding out rehydrophilizing.
STERAPORE 5700 Series (FF) Instruction Manual
Chapter 8 Maintenance
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