Improved Configuration for Batch Pressure-Driven Membrane Separation (Batch Reverse Osmosis)

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2020-WARS-68813
Researchers at Purdue University have developed a new approach to water treatment known as batch reverse osmosis (RO). Reverse osmosis is a critical step to water treatment to meet the need of clean drinking water for a growing global population. The technique created by Purdue researchers features a high-pressured feed tank with a reciprocation piston that fills one side with the following cycle's feedwater and then alternates treated water for new water repeatedly until at least 50% recovery is achieved, keeping permeate separate from either semi-batch. This eliminates the traditional flushing step of emptying the feed tank as well as prevents brackish water and brine from mixing with the new feed, which is a major concern with standard systems. The batch RO method has potential to operate below 2 kWh/m^3 power for seawater and takes just 10% of the downtime of the entire RO process.

Advantages
-Reliable
-Lessens Downtime Between Batches
-Reduces Entropy Generation
-Low Power

Potential Applications
-Reverse Osmosis
-Water Treatment
Sep 30, 2020
PCT-Patent
WO
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Oct 1, 2019
Provisional-Patent
United States
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