Id imagine a lot of the other desal plants (esp. those in Saudi Arabia) are less than obligated to admit to their resource usage and waste products. Apparently desal is very energy intensive. OP pointed out using solar but I would like an equivalent of how many 400W solar panels does it take to make 1 gallon desal water.
No idea, but AMTA reports 2.5 to 3.5 kwh/ m3 (10-13 kwh/kgal). They write: "Based on nationwide data from the Energy Information Administration, a typical refrigerator average annual energy usage is 1,400-1,500 kwh. Using the average US water use per household of 100,000 gallons per year, the energy requirement for supplying desalinated water to a house in the US will be less than an old refrigerator, but the same as a newer, more efficient refrigerator power use."
My small desalination rig uses about 1200 watts and makes 30 gallons per hour. It cost me $3500. So it’s doable with 3 panels for this 2 person household.
I’d imagine a plant would benefit from economies of scale. Though these benefits could get eaten up by cost overruns. Frankly, it seems the hurdle in California is working through the people issues/concerns than technical problems.
It’ll be interesting to see the stats on this new desal technique when they have a product for sale.
