Harnessing Renewable Energy Where the River Meets the Sea

Pressure Retarded Osmosis (PRO)

Pressure retarded osmosis (PRO) is a method of producing renewable energy from two streams of a different salinity.
Credit: Jose-Luis Olivares/MIT

When the River Meets the Sea” may very well be a John Denver song circa 1979, but it is also an intersection with the potential to generate a significant amount of power. According to a team of mechanical engineers at MIT, when river water collides with sea water, there exists the potential to harness a significant amount of renewable energy.

This from Phys.org:

The researchers evaluated an emerging method of power generation called pressure retarded osmosis (PRO), in which two streams of different salinity are mixed to produce energy. In principle, a PRO system would take in river water and seawater on either side of a semi-permeable membrane. Through osmosis, water from the less-salty stream would cross the membrane to a pre-pressurized saltier side, creating a flow that can be sent through a turbine to recover power.

Read the full article here.

According to calculations by Leonardo Banchik, a graduate student in MIT’s Department of Mechanical Engineering, a PRO system could potentially power a coastal wastewater-treatment plant by taking in seawater and combining it with treated wastewater to produce renewable energy.

Although more research needs to be done to see in what applications the PRO system is economically viable, Banchik sees the huge potential of this method.

“Say we’re in a place that could really use desalinated water, like California, which is going through a terrible drought,” Banchik says. “They’re building a desalination plant that would sit right at the sea, which would take in seawater and give Californians water to drink. It would also produce a saltier brine, which you could mix with wastewater to produce power.”

Learn more about new devlopments in osmosis via ECS’s Digital Library.

DISCLAIMER

All content provided in the ECS blog is for informational purposes only. The opinions and interests expressed here do not necessarily represent ECS's positions or views. ECS makes no representation or warranties about this blog or the accuracy or reliability of the blog. In addition, a link to an outside blog or website does not mean that ECS endorses that blog or website or has responsibility for its content or use.

Post Comments

Your email address will not be published. Required fields are marked *