|
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
|