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Membrane scale inhibition principle education
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Membrane scale inhibition principle education
Technical explanation
The concentration of all impurities (dissolved and suspended) in the incoming water will be highest near the filter surface. When the osmotic force passes through the filter membrane and becomes pure water, all impurities remain near the membrane surface. The water layer next to the membrane surface (boundary layer) becomes more and more concentrated (dissolved and suspended impurities). These concentrations reach a certain stable concentration, which is determined by the water inlet rate, membrane recovery percentage and membrane permeate flux (gallons of permeate per square foot per day).
Be sure to follow the membrane manufacturer's recommendations for minimum inlet water flow, maximum membrane recovery percentage, and maximum membrane flux. These recommendations are based on the size and quality of the membrane being used to treat the water supply. The concentration of dissolved and suspended solids in the boundary layer controls filter membrane performance. Higher concentrations mean higher osmotic pressure, a higher tendency for suspended solids to solidify and coat the membrane surface, and a higher likelihood of scaling occurring. Maintaining correct membrane operating conditions is a key preventive measure to reduce membrane fouling.