MIT-onderzoekers: pekel en afvalwater beter dan zoet en zout water voor blauwe energie

AMSTERDAM – Wetenschappers van MIT hebben onderzocht hoe op grotere schaal energie kan worden geproduceerd uit de mix van zoet en zout water.

Energie uit water, Blauwe energie
©: MIT

Bij de productie van dit soort energie, zogenoemde blauwe energie, wordt zoet en zout water gemengd. Wanneer beide soorten water gescheiden worden door een membraan, stroom het zoete water naar het zoute gedeelte.

Hierbij ontstaat een druk die een turbine kan aandrijven. De methode wordt in het Engels ook wel pressure retarded osmosis (PRO) genoemd.

Uit het onderzoek van MIT bleek dat hoe groter het membraan is, hoe meer energie wordt opgewekt tot op een punt.

Maximale productie

Ze vonden dat 95 procent van de maximale productie ook kan worden bereikt met de helft of zelfs minder van het maximale membraanoppervlakte.

Leonardo Banchik, onderzoeker aan MIT, benadrukt dat als er minder oppervlakte nodig om eenzelfde hoeveelheid stroom te produceren er minder kosten nodig zijn om grote projecten op te zetten.


“Mensen hebben geprobeerd te ontdekken wanneer deze systemen levensvatbaar zouden zijn bij het samensmelten van een rivier en de zee”, aldus Banchik.

“Je kan dus geld besparen als je de specifieke membraanoppervlakte identificeert waarbij de productie nog niet fors afneemt.”

Uit het onderzoek kwam verder naar voren dat een hogere ratio van zout tussen twee de watersoorten voor een hogere productie zorgt. Toegepast op de praktijk kan bijvoorbeeld een mix van pekel en afvalwater voor nog betere resultaten zorgen dan zoet en zout water.


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