FINAL REPORT Evaluation of Seawater Desalination Projects ...
FINAL REPORT Evaluation of Seawater Desalination Projects ...
FINAL REPORT Evaluation of Seawater Desalination Projects ...
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EVALUATION OF SEAWATER DESALINATION PROJECTS<br />
PROPOSED FOR THE MONTEREY PENINSULA<br />
Costs for chemicals in the estimate appear to be purchase costs, not including expense <strong>of</strong><br />
transporting and handling them to the ship.<br />
Additionally, no contingency or on-line factor appears to have been included in the operating<br />
cost estimate.<br />
Conclusion<br />
The component treatment technologies (membrane filtration and reverse osmosis) selected<br />
for the Water Standard Company project are in concept appropriate for the application.<br />
However, important design parameters <strong>of</strong> the membrane filtration and RO must be defined<br />
through long-term pilot testing. Of specific concern is the development <strong>of</strong> chemical washing<br />
design parameters (Pall’s EFM process) and Clean-in-Place requirements. Considering that<br />
these processes generally use chemicals (e.g., sodium hypochlorite, caustic, and acids) that<br />
require special handling and introduce safety requirements, their impact on operating on<br />
shipboard could be critical.<br />
The proponent’s cost estimates for the treatment components <strong>of</strong> the project are considered<br />
optimistic, with the selection <strong>of</strong> maintenance budget and contingency level (both capital and<br />
operating). Assumptions on electricity expense deserve additional scrutiny should the project<br />
receive further consideration<br />
Waste Stream Fate Identified<br />
Brine from the desalination process would be disposed <strong>of</strong> by diluting it with native seawater<br />
in containers on the vessel. This process is also designed to cool the diluted brine to levels<br />
near ambient seawater temperature. The diluted brine is discharged at sea surface.<br />
Availability <strong>of</strong> Historical Feedwater Quality Data and Sanitary Survey<br />
No data have been collected.<br />
Quality <strong>of</strong> Supporting Documentation<br />
The most comprehensive document provided or obtained in support <strong>of</strong> the SDV is the<br />
proponent’s statement, dated April 2007. The six-page statement provided summary<br />
information regarding the following:<br />
• Project proposal<br />
• Project description and summary<br />
• Contract option<br />
• Drinking water production and operations<br />
• Timeline and schedule<br />
• Public outreach and lobbying efforts<br />
Monterey Peninsula Water Management District 3-24
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