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Brian Westenhaus

Brian Westenhaus

Brian is the editor of the popular energy technology site New Energy and Fuel. The site’s mission is to inform, stimulate, amuse and abuse the…

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Redox Flow Desalination Offers Potable Water and Energy Storage

  • NYU Tandon engineers optimized the Redox Flow Desalination system to increase salt removal rate by 20% and decrease energy demand.
  • The integrated system provides scalable energy storage and addresses both freshwater scarcity and renewable energy integration.
  • This breakthrough technology has the potential to revolutionize water desalination and renewable energy solutions, offering a promising avenue for cost-effective and sustainable processes.
Water

Researchers at NYU Tandon School of Engineering achieved a major breakthrough in Redox Flow Desalination (RFD), an emerging electrochemical technique that can turn seawater into potable drinking water and also store affordable renewable energy.

In a paper published in Cell Reports Physical Science, the NYU Tandon team led by Dr. André Taylor, professor of chemical and biomolecular engineering and director of DC-MUSE (Decarbonizing Chemical Manufacturing Using Sustainable Electrification), increased the RFD system’s salt removal rate by approximately 20 percent while lowering its energy demand by optimizing fluid flow rates.

RFD offers multiple benefits. These systems provide a scalable and flexible approach to energy storage, enabling the efficient utilization of intermittent renewable energy sources such as solar and wind.

RFD also proposes an entirely new solution to the global fresh water crisis.

Dr. Taylor explained, “By seamlessly integrating energy storage and desalination, our vision is to create a sustainable and efficient solution that not only meets the growing demand for freshwater but also champions environmental conservation and renewable energy integration.”

RFD can both reduce reliance on conventional power grids and also foster the transition towards a carbon-neutral and eco-friendly water desalination process. Furthermore, the integration of redox flow batteries with desalination technologies enhances system efficiency and reliability.

The inherent ability of redox flow batteries to store excess energy during periods of abundance and discharge it during peak demand aligns seamlessly with the fluctuating energy requirements of desalination processes.

“The success of this project is attributed to the ingenuity and perseverance of Stephen Akwei Maclean, the paper’s first author and a NYU Tandon Ph.D. candidate in chemical and biomolecular engineering,” said Taylor. “He demonstrated exceptional skill by designing the system architecture using advanced 3D printing technology available at the NYU Maker Space.”

Schematic for a four-channel RFD in single-pass mode with an A/A*, representing electrochemical reactions of redox species dissolved in conducting salts solutions, and channels separated by cation-exchange membrane (CEM) and anion-exchange membrane (AEM). Image Credit: NYU Tandon. For more information and more images including a batch and single pass mode schematics click the study paper link for the open access paper.

The intricacies of the system involve the division of incoming seawater into two streams: the salinating stream (Image above, CH 2) and the desalinating stream (Image above, CH 3). Two additional channels house the electrolyte and redox molecule (Image above, A). These channels are effectively separated by either a cation exchange membrane (CEM) or an anion exchange membrane (AEM).

In CH 4, electrons are supplied from the cathode to the redox molecule, extracting Na+ that diffuses from CH 3. The redox molecule and Na+ are then transported to CH 4, where electrons are supplied to the anode from the redox molecules, and Na+ is allowed to diffuse into CH 2. Under this overall potential, Cl- ions move from CH 3 through the AEM to CH 2, forming the concentrated brine stream.

Consequently, CH 3 generates the freshwater stream.

“We can control the incoming seawater residence time to produce drinkable water by operating the system in a single pass or batch mode,” said Maclean.

In the reverse operation, where the brine and freshwater are mixed, the stored chemical energy can be converted into renewable electricity. In essence, RFD systems can serve as a unique form of “battery,” capturing excess energy stored from solar and wind sources. This stored energy can be released on demand, providing a versatile and sustainable supplement to other electricity sources when needed.

The dual functionality of the RFD system showcases its potential not only in desalination but also as an innovative contributor to renewable energy solutions.

While further research is warranted, the findings from the NYU Tandon team signal a promising avenue towards a more cost-effective RFD process – a critical advancement in the global quest for increased potable water.

As climate change and population growth intensify, more regions grapple with water shortages, underscoring the significance of innovative and efficient desalination methods.

This research aligns seamlessly with the mission of DC-MUSE (Decarbonizing Chemical Manufacturing Using Sustainable Electrification), a collaborative initiative established at NYU Tandon.

DC-MUSE is committed to advancing research activities that diminish the environmental impact of chemical processes through the utilization of renewable energy.

The current study builds upon Taylor’s extensive body of work in renewable energy, with a recent emphasis on storing sustainably produced energy for utilization during off-peak hours.

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In addition to Taylor and Maclean, the dedicated team of NYU Tandon researchers contributing to this study includes Syed Raza, Hang Wang, Chiamaka Igbomezie, Jamin Liu, Nathan Makowski, Yuanyuan Ma, Yaxin Shen, and Jason A. Röhrl. Collaborating across borders, Guo-Ming Weng from Shanghai Jiao Tong University in China also played a crucial role as a team member.

**

Potable or drinking water is for the developed world essentially a seldom considered topic of concern. But for billions of people clean safe drinking water is a daily worry. Where daily food and water supplies are a constant concern this kind of research is of great importance.

There isn’t a lot of information on the electrical demands beyond including the renewable interest. One has to be careful though, as the demand might be quite substantial and have a slowing or stop effect to utilization. Coming up with electrical power for most of the world remains a huge endeavor.

But if this technology can do double duty in storage of energy and produce potable water the value to a society surely doubles – if not more. This might be seen as a breakthrough technology someday.

By Brian Westenhaus via New Energy and Fuel

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