This project proposes the first batch osmotically assisted reverse osmosis process, termed batch counterflow reverse osmosis

This Cooperative Agreement award from the U.S. Department of the Interior Bureau of Reclamation under the Desalination and Water Purification Research (DWPR) program (CFDA 15.506) is funding the development of a novel batch-operated reverse osmosis desalination process called "batch counterflow reverse osmosis." The $490,305.48 award to Purdue University aims to create the first experimental lab-scale demonstration of this technology and develop a fundamental understanding of its fouling kinetics. The project proposes to achieve exceptionally high salinities through counterflow of the brine and dilute streams, as well as high efficiencies by using a reciprocating piston-tank to follow the osmotic curve. This work aligns with the DWPR program's goals of augmenting usable water supplies, minimizing environmental impacts, and advancing innovative desalination approaches.

This process achieves exceptionally high salinities by counterflow of the brine and dilute, and high efficiencies via batch operation of a reciprocating piston-tank to make pressure follow the osmotic curve. Implementing multistage batches at higher salinities is done using the same components in one stage, requiring far fewer parts than competing approaches. This project will create the first experimental lab-scale demonstration of batch counterflow reverse osmosis and develop a fundamental understanding of fouling kinetics for the process.