Davies, Philip A., Wayman, James, Alatta, Chioma, Nguyen, Kim and Orfi, Jamel (2016). A desalination system with efficiency approaching the theoretical limits. Desalination and Water Treatment, Latest ,
Abstract
The objective of this project is to design a new desalination system with energy efficiency approaching the theoretical thermodynamic limit—even at high recovery ratio. The system uses reverse osmosis (RO) and a batch principle of operation to overcome the problem of concentration factor which prevents continuous-flow RO systems from ever reaching this limit and thus achieving the minimum possible specific energy consumption, SEC. Batch operation comprises a cycle in three phases: pressurisation, purge, and refill. Energy recovery is inherent to the design. Unlike in closed-circuit desalination (CCD), no feedwater is added to the pressure circuit during the pressurisation phase. The batch configuration is compared to standard configurations such as continuous single-stage RO (with energy recovery) and CCD. Theoretical analysis has shown that the new system is able to use 33% less energy than CCD at a recovery ratio of 80%. A prototype has been constructed using readily available parts and tested with feedwater salinities and recovery ratios ranging from 2,000 to 5,000 ppm and 17.2–70.6%, respectively. Results compare very well against the standard configurations. For example, with feedwater containing 5,000 ppm NaCl and recovery ratio of 69%, a hydraulic SEC of 0.31 kWh/m3 was obtained—better than the minimum theoretically possible with a single-stage continuous flow system with energy recovery device.
Publication DOI: | https://doi.org/10.1080/19443994.2016.1180482 |
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Divisions: | College of Engineering & Physical Sciences > School of Engineering and Technology > Mechanical, Biomedical & Design College of Engineering & Physical Sciences > School of Infrastructure and Sustainable Engineering > Engineering Systems and Supply Chain Management College of Engineering & Physical Sciences > Sustainable environment research group College of Engineering & Physical Sciences > Aston Institute of Materials Research (AIMR) |
Additional Information: | This is an Accepted Manuscript of an article published by Taylor & Francis in Desalination and Water Treatment on 9/5/16, available online: http://www.tandfonline.com/10.1080/19443994.2016.1180482 |
Uncontrolled Keywords: | batch desalination,brackish water,high efficiency,high recovery,RO,solar,sustainable development,Pollution,Water Science and Technology,Ocean Engineering |
Publication ISSN: | 1944-3986 |
Last Modified: | 05 Aug 2024 17:43 |
Date Deposited: | 19 Aug 2019 10:08 |
Full Text Link: |
http://www.tand ... 94.2016.1180482 |
Related URLs: |
http://www.scop ... tnerID=8YFLogxK
(Scopus URL) |
PURE Output Type: | Article |
Published Date: | 2016 |
Published Online Date: | 2016-05-09 |
Accepted Date: | 2016-03-13 |
Submitted Date: | 2015-03-25 |
Authors: |
Davies, Philip A.
(![]() Wayman, James Alatta, Chioma Nguyen, Kim Orfi, Jamel |