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- W4229555714 abstract "Reverse osmosis (RO) desalination is a well-established process that removes salt from sea water or brackish water sources. However, scaling by sparingly soluble salts on the membrane surface has been shown to significantly degrade membrane performance. We report the results from a comprehensive study evaluating the effectiveness of flow reversal (FR) controlled by ultrasonic sensors in mitigating scaling during RO desalination. The work utilized a sophisticated multi-port bench-scale flat-sheet cross-flow module with the ability to operate in FR mode with externally mounted ultrasonic sensors. A novel signal-analysis methodology was developed to utilize the ultrasonic waveforms to control a switch in flow direction at the onset of local scaling. Experiments were conducted under controlled conditions with repeated forward-flow (FF) and reverse-flow (RF) cycles. Data from the experiments confirmed that FR controlled by ultrasonic sensors can effectively mitigate scaling on the membrane surface and avoid the expected level of permeate-flow decrease. These results were validated by post-mortem membrane analysis including scalant gravimetric and membrane area-coverage measurements. Overall, the work demonstrates the successful adaptation of ultrasonic sensors for active process control in which the timing of the change in flow direction is critical." @default.
- W4229555714 created "2022-05-11" @default.
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- W4229555714 date "2012-11-01" @default.
- W4229555714 modified "2023-09-28" @default.
- W4229555714 title "Ultrasonic sensor control of flow reversal in RO desalination—Part 1: Mitigation of calcium sulfate scaling" @default.
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- W4229555714 doi "https://doi.org/10.1016/j.memsci.2012.05.027" @default.
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