Review of the Desalination and Water Purification Technology by National Research Council, Division on Earth and Life

By National Research Council, Division on Earth and Life Studies, Water Science and Technology Board, Committee to Review the Desalination and Water Purification Technology Roadmap

The Bureau of Reclamation and Sandia nationwide Laboratories together built the Roadmap to function a strategic learn pathway for desalination and water purification applied sciences to satisfy destiny water wishes. The e-book recommends that the Roadmap contain a sharper concentrate on the examine and technological developments had to succeed in the long term targets. The ebook additionally means that the environmental, monetary, and social bills of power required through elevated dependence on desalination be tested. concepts for imposing the Roadmap initiative are provided.

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All rights reserved. html 26 Review of the Desalination and Water Purification Technology Roadmap FIGURE 3-1 Size ranges removed by various membrane types along the filtration spectrum. SOURCE: Pankratz and Tonner, 2003. • Microfiltration (MF) membranes are used for turbidity reduction and removal of suspended solids and bacteria. MF membranes operate via a sieving mechanism under a trans-membrane pressure difference in the range of ~50 – 500 kPa. Electrodialysis is another membrane-based process that is important to desalination, which operates under a different driving force, applying an electrical potential to motivate ions in opposite directions to produce an ion-depleted and ion-enriched stream in each cell pair.

4 The solution diffusion theory presumes that both the solutes and water molecules dissolve in the RO membrane material and diffuse through. Water passes based on pressure, but solute separation occurs because of a difference in diffusion rates through the RO membrane. Copyright © National Academy of Sciences. All rights reserved. html 26 Review of the Desalination and Water Purification Technology Roadmap FIGURE 3-1 Size ranges removed by various membrane types along the filtration spectrum. SOURCE: Pankratz and Tonner, 2003.

Such an implementation strategy for the Roadmap should include a comprehensive peer-review process for selecting and funding research proposals, involving the widest range of scientists and engineers available. Mechanisms for setting research priorities, information sharing, and technology transfer should be developed. These implementation issues are discussed in more detail in Chapter 4. Copyright © National Academy of Sciences. All rights reserved. html Overall Assessment of the Roadmap 23 CONCLUSIONS AND RECOMMENDATIONS Conclusion: The Roadmap does not explain how the critical objectives were derived.

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