Membrane Cleaning Questions & Answers
How often should I clean my membranes?
In normal operation, the membrane in reverse osmosis membrane elements can
become fouled by suspended solids, microorganisms and mineral scale. These
deposits build up during operation and cause loss in water output or salt
rejection, or both. Membrane elements should be cleaned whenever the normalized
water output rate drops by 15% from its initial flow rate (the flow rate
established during the first 24 to 48 hours of operation) or when salt content
in in the product water rises noticeably.
Is is necessary to heat our RO cleaning solution when the temperature of our well water is already relatively warm and does not change much throughout the year?
If your cleaning solution temperature is at least 20 deg C, then you do not need a heating element. Also, as you recycle the water there will be further rise in temperature, which should be kept below 50 deg C.
What is the proper sequence to follow when cleaning my membranes?
Membrane Cleaning Sequence
What should the flow rate be for proper membrane cleaning?
Estimate of Total Flow Required for Membrane Cleaning
How much cleaning solution will I need to clean my membranes?
Estimate of Cleaning Solution Volume
Which Membrane Cleaner Should I Use?
The membrane cleaner required will depend on the type of fouling the membrane
has been exposed to. Visit the below page to troubleshoot:
In Mongolia we are using RO elements Dow/Hydranautics BW30LE-4040, treating groundwater high in TDS (no organics). For CIP, can we use HCl as a cleaning agent? We do not have Cirtic Acid and shipping will take a long time (getting through Chinese Border). If we can use HCl, what dosage or solution strength should we use?
Yes, you can use HCl. Add acid to water very slowly and carefully while stirring (mixing) till you have a pH of 3 (do not go below 2). Use this water and circulate for cleaning.
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