Under their scheme, to produce 1 acre foot of drinking water, 5 acre feet of sea water must be pulled directly from the ocean. That same 1 acre foot of sea water requires approximately 4700 kilowatt hours of electricity to remove the brine and other pollutants.
In contrast, by recycling wastewater to drinking water quality the same 1 acre foot of drinking water can be rendered using only 1.17 acre feet of wastewater, and would only require 2200 kilowatt hours of electricity. I believe the old adage “more bang for your buck” applies here.
Doing the math, it is far more economical to render wastewater into drinking water than render sea water into drinking water. Yet the battle for common sense rages on. See the article below for an update.
Carlsbad Desalination Plant Timetable Delayed
Poseidon’s project output is 10% of region’s daily water needs
By GENE CUBBISON
While drought-stricken San Diegans brace for water rationing, a desalination project that could meet 10 percent of the region’s water needs has been delayed for two more months. While drought-stricken San Diegans brace for water rationing, a desalination project that could meet 10 percent of the region’s water needs has been delayed…
The $300 million proposal by Poseidon Resources Corp. needs approval from one more state regulatory agency, the San Diego Regional Water Quality Control Board, to break ground on the project later this year, working toward a completion date in 2011.
“Every regulatory agency that has reviewed this project has determined that it’s environmentally benign,” said Scott Maloni, a Poseidon vice president. “Let’s build this project. We need the water.”
But the board voted unanimously Wednesday to withhold final permits at least until April, to allow the agency’s staff and Poseidon to work out what Poseidon officials called “minor issues” relating to environmental concerns that already have prompted lawsuits against Poseidon and the state’s Lands and Coastal Commissions, which have granted approvals.
Click Here for the full article from MSNBC.com