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Not really. Desalination plant built & proposed locations have largely been adjacent to power plants or wastewater facilities. The main reason we don't have de
by dubyah 8y ago
Not really. Desalination plant built & proposed locations have largely been adjacent to power plants or wastewater facilities.
The main reason we don't have desalination plants is that the water is more expensive than other sources, they're expensive to run, consume a lot of power, and you have to deal with the brine effluent.
Imported water and even purified recycled wastewater(potable reuse) are cheaper. In the case of the desalination plant in Carlsbad, desalinated water is about $2.1-2.4k per acre-foot whereas imported water is ~$1k and potable reuse had an estimate of $1.7-1.9k per acre-foot for the San Diego region(OC's potable reuse is cheaper at ~$800 per acre-foot, but trying to keep similar comparisons).
Power comprises most of the cost of desalination for the high pressures required for the membranes to work. I think it's 5 megawatt hours per acre-foot, but those were somewhat dated figures.
While one could deal with blending the brine with wastewater treatment plant effluent or power plant cooling water, the greater reclamation of wastewater and the California Coastal Commission cracking down harder on the discharge of power plant cooling water is complicating things.
Desalination is an expensive commitment that produces at a slower rate than other sources. If you have a wet year, you're still stuck with the production commitment. It's great for water security though.