Membrane Exceeds Power Density Target

Late last week, Nathan Hancock, the research director for Massachusetts-based Oasys Water, told WDR, “We have consistently achieved a power density greater than 7 W/m2 using a 28 g/L sodium chloride draw solution and a ‘clean water’ feed at 20˚C – conditions that replicate PRO in a seawater/river water application.” Most importantly, the company was able to do so with its standard, commercially available, 4-inch diameter, 40-inch long spiral-wound element.

“Our elements have been tested by third parties to confirm the results, and we’re encouraged that additional improvements currently underway will yield performance even greater than 10 W/m2. And, by switching to our proprietary thermolytic draw solution and osmotic heat engine design, we could go much higher,” he added.

Hancock noted that a paper published online in Environmental Science & Technology this month by the Colorado School of Mines’ Tzahi Cath and his colleagues, showed that Oasys’ membrane outperformed the others that were tested and was able to operate at a flux that was almost three times higher than other commercially available thin-film composite and cellulose acetate forward osmosis (FO) membranes.

Oasys CEO Jim Matheson told WDR that the company is exploring partnerships with leading membrane producers and PRO developers who can make use of its PRO membrane technology while the company sticks to its core focus and continues to develop FO technology-based systems.

This is an excerpt from a longer article, which can be found at