Chemical Sanitization of RO Systems

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Sanitization of the reverse osmosis water purification system and biofilm removal from water system.
To control microbial growth,
RO systems must be chemically sanitized on a regular basis. 






Prior to sanitation it is important to chemically clean the
first-pass RO system. This will help to disrupt any biofilm that protects viable bacteria from contact with the sanitant. It also removes foulants that will react with and chemically deplete the sanitizing agent.
Typically this is done in a two-step process.
The first step commonly involves the use of an acid cleaner such as citric acid to remove the inorganic foulants.
Next, a high-pH cleaner such as sodium hydroxide is used in order to remove organic foulants. Then the system is sanitized with one ofthe following agents: formaldehyde, hydrogen peroxide, or peracetic acid/hydrogen peroxide. It is important to consult the manufacturer of the RO system to determine the correct concentrations of the chemicals that are compatible with the membranes in the system, and always rinse with Purified Water before changing chemicals.Both cleaning and sanitation processes consist offour steps.
First, the cleaning chemical is mixed with permeate water in a clean-in-place (ClP) tank.
Second, the chemical solution is recirculated through theRO systemfor 15 to 30 minutes. Then,the system is left to soak for 20 to 30 minutes. The system should be started once every 5 to 10 minutes for a short time to allow fresh solution to contact the membrane. Finally, the system shouldbe rinsed with permeate water until the residual cleaning and/or sanitation chemicals have been removed.Although the second pass of the RO does not typically require cleaning as frequently as the firstpass, a regular cleaning and sanitation schedule should be maintained. This schedule should be based on the microbial concentrations and samples collected from the permeate water from the second-pass RO membrene.
When microbial concentrations in the permeate begin to rise steadily,sanitation should be conducted.If peracetic acid or hydrogen peroxide are used to sanitize PA membranes, the membrane must be cleaned with an acid cleaner in order to remove free iron and any other transitional metals; otherwise the membrane may be chemically damaged by the sanitation procedure. It is also important to make certain that the sanitant is mixed with water that is free of chlorine. The membrane's exposure to the sanitant should not exceed one hour per week at the recommended concentration level, or reduced membrane life may occur.
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Dheeraj kumar shukla


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