Self-powered desalination of geothermal saline groundwater:technical feasibility


This theoretical study shows the technical feasibility of self-powered geothermal desalination of groundwater sources at <100 °C. A general method and framework are developed and then applied to specific case studies. First, the analysis considers an ideal limit to performance based on exergy analysis using generalised idealised assumptions. This thermodynamic limit applies to any type of process technology. Then, the analysis focuses specifically on the Organic Rankine Cycle (ORC) driving Reverse Osmosis (RO), as these are among the most mature and efficient applicable technologies. Important dimensionless parameters are calculated for the ideal case of the self-powered arrangement and semi-ideal case where only essential losses dependent on the RO system configuration are considered. These parameters are used to compare the performance of desalination systems using ORC-RO under ideal, semi-ideal and real assumptions for four case studies relating to geothermal sources located in India, Saudi Arabia, Tunisia and Turkey. The overall system recovery ratio (the key performance measure for the self-powered process) depends strongly on the geothermal source temperature. It can be as high as 91.5% for a hot spring emerging at 96 °C with a salinity of 1830 mg/kg.

Publication DOI:
Divisions: College of Engineering & Physical Sciences > School of Engineering and Technology > Mechanical, Biomedical & Design
College of Engineering & Physical Sciences > Sustainable environment research group
Uncontrolled Keywords: brackish water,desalination,exergy,geothermal,high recovery,organic rankine cycle,reverse osmosis,self-powered,Aquatic Science,Biochemistry,Water Science and Technology,Geography, Planning and Development
Publication ISSN: 2073-4441
Last Modified: 21 Jun 2024 16:01
Date Deposited: 04 Feb 2015 13:45
Full Text Link: http://www.mdpi ... -4441/6/11/3409
Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
PURE Output Type: Article
Published Date: 2014-11-14
Authors: Davies, Philip A. (ORCID Profile 0000-0003-4783-1234)
Orfi, Jamel



Version: Published Version

Export / Share Citation


Additional statistics for this record