Theoretical and Experimental Investigations of the Potential of Osmotic Energy for Power Production †

This paper presents a study on the potential of osmotic energy for power production. The study includes both pilot plant testing and theoretical modelling as well as cost estimation. A projected cost of £30/MWh of clean electricity could be achieved by using a Hydro-Osmotic Power (HOP) plant if a suitable membrane is used and the osmotic potential difference between the two solutions is greater than 25 bar; a condition that can be readily found in many sites around the world. Results have shown that the membrane system accounts for 50%–80% of the HOP plant cost depending on the salinity difference level. Thus, further development in membrane technology and identifying suitable membranes would have a significant impact on the feasibility of the process and the route to market. As the membrane permeability determines the HOP process feasibility, this paper also describes the effect of the interaction between the fluid and the membrane on the system permeability. It has been shown that both the fluid physical properties as well as the membrane micro-structural parameters need to be considered if further development of the HOP process is to be achieved.

[1]  H. Masuda,et al.  Osmo-power. Theory and performance of an osmo-power pilot plant , 1981 .

[2]  A. Sharif,et al.  Mass transfer in pressure-driven membrane separation processes, Part II , 2011 .

[3]  T. Holt,et al.  The potential for power production from salinity gradients by pressure retarded osmosis , 2009 .

[4]  Stein Erik Skilhagen.  Osmotic power — a new, renewable energy source , 2010 .

[5]  R. Baker,et al.  Membranes for power generation by pressure-retarded osmosis , 1981 .

[6]  Chuyang Y. Tang,et al.  Osmotic power production from salinity gradient resource by pressure retarded osmosis: Effects of operating conditions and reverse solute diffusion , 2012 .

[7]  S. Loeb.  Energy production at the Dead Sea by pressure-retarded osmosis: challenge or chimera? , 1998 .

[8]  S. Loeb.  Large-scale power production by pressure-retarded osmosis, using river water and sea water passing through spiral modules , 2002 .

[9]  Stein Erik Skilhagen,et al.  Membrane processes in energy supply for an osmotic power plant , 2008 .

[10]  S. Loeb,et al.  A two-coefficient water transport equation for pressure-retarded osmosis , 1978 .

[11]  Y. El-Sayed,et al.  The energetics of desalination processes , 2001 .

[12]  Adel O. Sharif,et al.  Water permeability in polymeric membranes, Part I , 2010 .

[13]  G. D. Mehta,et al.  Further results on the performance of present-day osmotic membranes in various osmotic regions , 1982 .

[14]  M. Elimelech,et al.  Membrane-based processes for sustainable power generation using water , 2012, Nature.

[15]  Stein Erik Skilhagen,et al.  Osmotic power — power production based on the osmotic pressure difference between waters with varying salt gradients , 2008 .

[16]  S. Loeb,et al.  Performance of permasep B-9 and B-10 membranes in various osmotic regions and at high osmotic pressures , 1978 .

[17]  A. Bertucco,et al.  Experimental approaches to feed solution permeability in pressure-driven membrane separation processes , 2010 .

[18]  Ngai Yin Yip,et al.  Thermodynamic and energy efficiency analysis of power generation from natural salinity gradients by pressure retarded osmosis. , 2012, Environmental science & technology.

[19]  Chuyang Y. Tang,et al.  Thin-film composite hollow fiber membranes for Pressure Retarded Osmosis (PRO) process with high power density , 2012 .

[20]  Charles James Lemckert,et al.  Osmotic power with Pressure Retarded Osmosis: Theory, performance and trends – A review , 2014 .

[21]  A. Tanioka,et al.  Power generation with salinity gradient by pressure retarded osmosis using concentrated brine from SWRO system and treated sewage as pure water , 2012 .

[22]  Uri Lachish.  Osmosis and thermodynamics , 2007 .

[23]  Robert L McGinnis,et al.  A novel ammonia–carbon dioxide osmotic heat engine for power generation , 2007 .

[24]  Yu Chang Kim,et al.  Potential of osmotic power generation by pressure retarded osmosis using seawater as feed solution: Analysis and experiments , 2013 .

[25]  Amy E. Childress,et al.  Power generation with pressure retarded osmosis: An experimental and theoretical investigation , 2009 .

[26]  M. Reali,et al.  Submarine hydro-electro-osmotic power plants for an efficient exploitation of salinity gradients , 1981 .

[27]  S. Loeb,et al.  Production of energy from concentrated brines by pressure-retarded osmosis : II. Experimental results and projected energy costs , 1976 .

[28]  M. A. Laughton,et al.  Renewable energy sources , 1990 .