34 ANALYTICAL AND LABORATORY EQUIPMENT
In-lab membrane cleaning M
Michele Christian explains the synergy of membrane cleaners
embrane cleaning often challenges water treatment facilities
across a variety of industries. As membranes become fouled from use they become less effective. Clean membranes allow for the proper flow of water. Keeping membranes clean is key to maintaining an optimal flux rate and helps to ensure that the treatment facility is operating effectively.
The economics of maintenance Treatment facility operators realise the importance of
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implementing a regular membrane cleaning regime, but are often challenged to find the right cleaning products. Ideally they will want to find a cleaner that will restore membrane flux (which will in turn prolong the life of the membrane), reduce the cleaning frequency needed, be safe for both the membranes and the environment, and prove easy to use. Using the right membrane cleaner is a good economic decision as it minimises downtime and prolongs membrane life. Since membranes are extremely expensive, most facilities try their best to keep them operational for as long as possible. Many membranes are
sensitive to harsh chemicals and extreme pH levels. It is important for treatment plant and laboratory operators to choose cleaners that will not be harmful
to the membranes. Many speciality cleaners with mild pH ranges and safe ingredients are formulated to be effective, non-harmful cleaning agents for membranes.
The correct chemical is key
Another consideration in choosing the proper membrane cleaner is the type of soil found in the water that is being treated. Alkaline cleaners dissolve oils and greases; some also contain chelants that can suspend metals and minerals. Citric acid cleaners are excellent at dissolving scale, such as calcium carbonate or iron oxide. Hazardous acid cleaners, such as sulphuric, hydrochloric and phosphoric, will serve the same purpose, but citric acid is much safer and has a broader range of filter compatibilities. A citric
Above: Membrane filters need to be de-fouled regularly
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