WOULD LIKE TO KNOW ABOUT PRESSURE RETARDED OSMOSIS PPT PRESENTATION TO UPDATE MY KNOWLEDGE ON THE DEVELOPMENT IN THIS AREA. A AM A MEMBRANE MANUFACTURER LOCATED IN INDIA
Pressure-delayed osmosis (PRO) is a technique for separating a solvent (eg, fresh water) from a solution that is more concentrated (eg seawater) and also pressurized. A semipermeable membrane allows the solvent to pass to the side of the concentrated solution by osmosis. The technique can be used to generate energy from the energy of the salinity gradient resulting from the difference in salt concentration between sea water and the river. In PRO, the water potential between fresh water and sea water corresponds to a pressure of 26 bar. This pressure is equivalent to a water column (hydraulic head) of 270 meters in height. However, the optimum working pressure is only half of this, 11 to 15 bar.
This method of power generation was invented by Prof. Sidney Loeb in 1973 at the Ben-Gurion University of the Negev, Beersheba, Israel. In 2014 the researchers verified that 95% of the theoretical power of the PRO system can be produced with a membrane that is half (or less) of the size needed to reach 100%. The output is proportional to the salinity. Desalination produces very salty brine, while treated wastewater has relatively little salt. The combination of these streams could produce power to power both facilities. However, the ignition of an existing wastewater treatment plant by mixing sewage treated with seawater may require a membrane surface of 2.5 million square meters. To address these membrane requirements, scientists are working on laminated membranes that will occupy much less space.