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Sea Water eXchange - SWx

SWx has the ability to produce Potable Water from input Sea, Bore hole, Well hole, River and Lake waters.

SWx technology utilises an electro chemical process which desalinates and purifies seawater and is based on the principal of electro separation enforced by the anode and cathode electrodes immersed in the seawater. The use of electricity in purifying liquids, natural and waste waters with different ionic species has proven to be one of the most environmentally friendly processes. Almost all components of treated waste waters are economically separated and reclaimed for further use.

SWx is commercially scalable through a modular approach, processing water from 500m3/day unto 100,000m3/day. This modular approach provides inherent scalability and simplicity, including easy maintenance. It can be manufactured and implemented rapidly in a full production environment and has low running costs through low energy, negligible chemical input requirement and self cleaning to stop inherent Calcium precipitation or biological fouling and clogging.

Process Overview

Initially incoming seawater has to be filtered. The seawater then passes through a series of SWx Conditioning Cells where all biological and organic matter is neutralized and microbiological bacteria are reduced or eliminated.

The conditioned seawater then passes into the SWx Separation Cells where the total seawater dissolved solids (TDS) are reduced to potable water at the required standard.

If required the potable water can be treated through an in-system chlorination process and stored for human use.

The pH levels in the returning waste seawater is managed by the SWx system. By setting the pH to the appropriate levels it will be possible to reduce the damaging environmental effect of atmospheric CO2 acidification on the sea and at the same time enhance the area’s marine life form.

The SWx configuration has been designed to allow continued operation and easy & rapid maintenance. In the unlikely event of a problem with one of the cells, it can be simply taken off line for repair or maintenance leaving the rest of the system to operate efficiently and effectively.

© Future Environmental Technologies (FET) 2016


The key benefits of SWx technology include:

Operates more cost-effectively at a broader range of salinities than conventional desalination technologies:

  • Reduces the total seawater dissolved solids (TDS) to drinking potable water at World Health Organisation or local Environmental Agency standards
  • Reduces the microbial total viable content by over 70% at average operating power. Coliforms are reduced by 96.7% and Escherichia Coli by > 90%
  • Significantly reduces the chlorination pre-treatment of the incoming seawater dosing to far less than 1 mg/L

Outperforms competing technologies in a number of key areas including:

  • Capital Cost / m3 - 20-40% lower
  • Opex / m3 - 50% lower
  • Time to build, install & process seawater - 50% quicker than competing technologies
  • Simple maintenance
  • No organic fouling, brine production or calcium precipitate.
  • Scalable, modular design leading to flexibility in plant design & capacity management

Environmentally friendly & efficient:

  • No GHG Emissions
  • No Heavy Chemical Usage
  • By setting the pH of the return water flows to the appropriate levels it will be possible to reduce the damaging environmental effect of atmospheric CO2 acidification on the sea

Designed to allow continuous operation  in the unlikely event of a problem with one of the cells, it can be simply taken off line for repair or maintenance leaving the rest of the system to operate efficiently and effectively