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Solar Powered Desalination Offers Ray of Hope for Indian Villages
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MUMBAI, April 18, 2019 /PRNewswire/ --

Scientia Professor David Waite with the third generation MCDI that was built by CTET in China  

UNSW's Global Water Institute seems to be at the cusp of a revolution in irrigation that could secure water supplies and food production during drought. The quest to provide clean water to Indian villages spurred the need for the innovation that could potentially act as a game-changer for world that is battling global warming and desertification.

Countries like India, China and Australia, among others are battling the challenge of producing food for an ever-increasing population amid  droughts and increasingly volatile climate conditions. Most of the agriculture practices in these countries rely heavily on groundwater, even though this water source is becoming increasingly saline at many locations, making it impractical to use.

To combat this issue and make fresh water readily available to the farming sector irrespective of the quality of the local groundwater supply, UNSW's Global Water Institute (GWI) is developing an innovative, solar-powered version of a desalination technology called Capacitive  Deionization (CDI).

CDI has significant potential to revolutionise irrigation and ensure that nations can continue to meet growing food production demands and protect against food shortage during  drought.

CDI removes salt from brackish water  by passing water through a stack of electrode pairs with positive ions such as sodium ("cations") attracted to the cathode and negative ions such as chloride ("anions") attracted to the anode.  When a voltage is applied across the electrodes, a desalted stream of water is produced.

While conventional CDI uses mains power, UNSW researchers have developed prototypes powered by solar energy. These solar-powered CDI units are an energy-efficient alternative with low operating voltage and the possibility of energy recovery, making it ideal for brackish water desalination, especially in remote locations where mains power may not be available. The units are also really easy to maintain, which makes the technology even more suited for use in remote-off grid communities.

The idea for the project was born when Sir Ratan Tata, the Chairman of the philanthropic Tata Trusts in India, visited UNSW to receive an honorary doctorate and challenged researchers to help find ways to provide clean water for Indian villages. Scientia Professor David Waite from the School of Civil and Environmental Engineering accepted the challenge and, with support from Professor John Fletcher from the School of Electrical Engineering and Telecommunications, constructed the first solar-powered prototype.

Second and third generation units, in which energy usage was  reduced by recovering a portion of the energy used, have been constructed with funding from an ARC Linkage grant with industry support by Goldwind Environmental Technologies, a Beijing-based company that is the largest manufacturer of wind turbines and is now expanding into development of water technologies.

"For this project, we innovated in both the mode of operation of the established technology of membrane capacitive deionisation (MCDI) and the use of solar energy combined with energy recovery to power the device," said Professor Waite, Executive Director of UNSW Centre of Transformational Environmental Technologies (CTET).

The collaborative team from UNSW's Faculty of Engineering is now working closely with Goldwind to trial the technology in Xinjiang Province in the far north-west of China. Plans are also underway to trial it in glasshouses  at Western Sydney University's Hawkesbury campus through the recently announced CRC for Future Food Systems.

Professor Waite says that providing  dependable water supply  options to the agriculture industry that are cost effective, can function independently of the electricity grid and do not carry a significant environmental burden is essential for Australia's future  food security.

"Scope exists for use of this technology in remote parts of Western Australia and the Northern Territory where the treatment of brackish water - typically the only water available - has been problematic using existing technology."

The UNSW Global Water Institute (UNSW-GWI) is a world leader in water research, innovation and problem solving. As the nation's most advanced water knowledge hub, the Institute draws on water expertise from seven faculties and 13 specialist centres across the University.

About University of New South Wales, Sydney  

UNSW, Australia's global university ranked among the top 50 Universities in the world offers programs in engineering, business, law, architecture, art and design, medicine and science.

Located in Sydney, a safe and student friendly city, UNSW is home to more than 52,000 students from nearly 130 countries. UNSW has been attracting a growing number of bright Indian students for undergraduate and post graduate studies.

As one of the world's leading research and teaching universities UNSW's cutting edge research and innovation facilitated by 3000 faculty is known for acceptance and successful commercialisation.

For more details, please visit: www.UNSW.edu.au


Media Contact:
Parmpreet Kaur
operations@communicateindia.com
+91-9870390819
Communicate India


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