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Optimization of Energy Recovery Seawater Reverse Osmosis Desalination Systems

Project ID: 9081
Principal Investigator: Steve Dundorf
Research Topic: Desalination and Water Treatment
Funded Fiscal Years: 2005, 2006, 2007, 2008 and 2009
Keywords: None

Research Question

* What is the minimum energy cost possible for seawater desalination using existing energy recovery technologies in an optimized total system?

* Is pilot scale system performance directly scalable to full scale?

Need and Benefit

There is a continuous need for less expensive water for potable and nonpotable sources. This is especially the case for ocean and brackish water sources, which traditionally have been relatively expensive to treat. The use of ocean and brackish water sources allows for continued population growth in areas that are water restricted and can reduce the reliance on overstressed rivers.

A key factor in reducing desalination costs has been improved energy recovery devices such as the pressure exchanger. Existing pressure exchanger technology has been shown to achieve two kilowatts per cubic meter (kWh/m[^3]) of produced water, but at lower recoveries of 30 percent. The goal for this pilot test is to achieve 1.5 kWh/m(^3) of produced water. It is important to evaluate energy recovery devices as a component of an entire reverse osmosis (RO) system and not as a stand-alone unit.

A part of making water available at a more affordable cost is ensuring that those involved in water treatment know the actual costs of the technology. The perception that RO treatment of seawater and brackish water is too expensive because of energy costs needs to be changed in order to have these advanced treatment options utilized.

Contributing Partners

Plant Structures, Technical Service Center

Research Products

Independent Peer Review

The following documents were reviewed by qualified Bureau of Reclamation employees. The findings were determined to be achieved using valid means.

Affordable Desalination Collaboration, Phase II Progress - IDA 2007 Conference Presentation (interim, PDF, 1.8MB)
By John MacHarg and Tom Seacord
Publication completed on September 25, 2007

This conference presentation includes a significant portion of the Affordable Desalination Collaboration phase II research. Presentend at the 2007 International Desalination Association conference in 2007. The final results are included in the subsequent 2012 California DWR report (see separate file).
Keywords: desalination, seawater, energy recovery, energy use

Bureau of Reclamation Review

The following documents were reviewed by experts in fields relating to this project's study and findings. The results were determined to be achieved using valid means.

Optimizing Seawater Reverse Osmosis for Affordable Desalination - CA Proposition 50 DWR Final Report (final, PDF, 17.8MB)
By John MacHarg
Report completed on August 30, 2012

This document is the final report for the Affordable Desalination Collaboration's Phase II research that took place from 2007 to 2010. While this is a California DWR report, permission was given to post this on Reclamation's website.
Keywords: desalination, seawater, energy recovery, energy use, affordable desalination collaboration, adc, reverse osmosis

This information was last updated on October 22, 2014
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