Blue energy  blauwe energie

Blue energy wordt opgewekt uit het spanningsverschil tussen zoet en zout water.

Blue energy is the energy retrieved from the difference in the salt concentration between seawater and river water with the use of reverse electrodialysis (RED) (or osmosis) with ion specific membranes. The waste product in this process is brackish water.

The technology of reversed electrodialysis has been confirmed in laboratory conditions. As in common technologies, the cost of the membrane was an obstacle. A new, cheap membrane, based on an electrically modified polyethylene plastic, made it fit for potential commercial use.

The water potential between fresh water and sea water corresponds to a pressure of 26 bars. This pressure is equivalent to a column of water 270 metres high.^[1] However, the optimal working pressure is only half of this, 11 to 15 bar.^[2]

In the Netherlands, for example, more than 3,300 m³ fresh water runs into the sea per second on average. The energy potential is therefore 3,300 MW, based on an output of 1 MW/m³ fresh water.

Bron wikipedia

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