Reverse osmosis (RO) normally runs at recovery close to 50% for seawater desalination and up to 75% for brackish water applications, creating excess brines that require disposal. Improving recovery has been a key challenge to RO's economic viability, especially at inland locations deficient in source water supplies and disposal capacities. Israeli startup Rotec aims to address the issue using Flow Reversal (FR), a proprietary approach that rotates membrane vessels before scale forms and periodically reverses the direction of feed streams in the last set of vessels to inhibit the buildup of scale.
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