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Is it possible to recover an old membrane after
a long time of inactivity and without water (dry)? If it is possible,
how we clean it and with which product ?
Most likely the membrane is
damaged and will not work. You may try cleaning with AM-11.
We are considering charging N2 thru the permeate of an RO array in
an attempt to reduce overall Delta by killing organic growth from the
surface of the membranes. To some degree we do reduce the delta by 10-12
lbs. But does this harm conventional Thin Film membranes if this procedure
is done frequently over time?
As long as there is no shock to
the membranes, such as sudden pressurization and depressurization, there
is no adverse effect on the membranes.
Can a membrane be flushed with a water temp of 80
degrees C? If not, what is the maximum temp. possible?
The elements of a membrane
cannot withstand temperatures above the rated maximum of 45 degrees C.
Anything higher than the maximum would destroy the elements of the
membrane. If a higher temperature is needed, we recommend Filmtec's
"Heat Sanitizable" membrane.
How can I remove the black growth on the unused
Cellulose Acetate membranes?
The black growth at the end
sections of the unused membrane elements is MOLD. The mold can be
removed by soaking the membrane in water solution containing 0.2 weight
percent Glutaraldehyde. Adjust pH to 5.5 for a period of 30 minutes.
What is the lifetime of a M-T1812A50 Membrane? Can
we use AM-11 to clean our filter?
AM-11 is generally used for cleaning larger membranes but some companies
use them also to clean smaller residential membranes. It is difficult to
predict the effectiveness of these chemicals, because each fouling
situation is different. You will have to try these for your situation to
determine the economic viability of cleaning small membranes.
Is it possible to store filmtec 8040 membranes in
formaldehyde after pulling them out of our RO unit that will be down for
a long period of time?
As long as formaldehyde is not used in the first 24 hours of running the
elements, storing these elements in formaldehyde is acceptable. A
solution of 0.5% is recommended. No other aldehyde is acceptable for
this purpose.
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