Here in California we’re entering our fourth consecuitive drought year. The snowpack in the Sierras was a dismal 2% of where it should have been last time I checked, and the swimming holes in my favorite spot, the Yuba River, will most likely be puddles. With so much of our drinking water coming from natural springs and relying on the snowmelt each winter to replenish reservoirs, we need to find alternative ways to get these resources.
One promising technology comes in the form of desalination. Several large facilities exist in CA and elsewhere around the world, but they’re incredibly expensive and not all that efficient. What about your everyday civilian who wants to do the same? Options are limited thus far, but this solar powered device engineered by some brilliant minds at MIT just won the 2015 Desal Prize, a competition ran by USAID that aims to bring water solutions to developing countries. Desalination is especially important for these areas, as indicated here
It works by using solar panels to capture energy that’s stored in a bank of batteries that power an electrodialysis machine which removes salt from water.
For those of us who aren’t electrodialysis experts:
“Electrodialysis works by passing a stream of water between two electrodes with opposite charges. Because the salt dissolved in water consists of positive and negative ions, the electrodes pull the ions out of the water, Winter says, leaving fresher water at the centre of the flow. A series of membranes separate the freshwater stream from increasingly salty ones.”