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UniSA develops novel solar tech to deliver potable water

Image Credits: UniSA, Press Release

Researchers at UniSA’s Future Industries Institute have developed a promising new process that could eliminate water stress for millions of people, including those living in many of the planet’s most vulnerable and disadvantaged communities. A team led by Associate Professor Haolan Xu has refined a technique to derive fresh water from seawater, brackish water, or contaminated water, through highly efficient solar evaporation, delivering enough daily fresh drinking water for a family of four from just one square metre of source water.

At the heart of the system is a highly efficient photothermal structure that sits on the surface of a water source and converts sunlight to heat, focusing energy precisely on the surface to rapidly evaporate the uppermost portion of the liquid. While other researchers have explored similar technology, previous efforts have been hampered by energy loss, with heat passing into the source water and dissipating into the air above.

“Previously many of the experimental photothermal evaporators were basically two dimensional; they were just a flat surface, and they could lose 10 to 20 per cent of solar energy to the bulk water and the surrounding environment,” Dr Xu says. “We have developed a technique that not only prevents any loss of solar energy but actually draws additional energy from the bulk water and surrounding environment, meaning the system operates at 100 per cent efficiency for the solar input and draws up to another 170 per cent energy from the water and environment.”

In contrast to the two-dimensional structures used by other researchers, the team developed a three-dimensional, fin-shaped, heatsink-like evaporator. Their design shifts surplus heat away from the evaporator’s top surfaces (i.e., solar evaporation surface), distributing heat to the fin surface for water evaporation, thus cooling the top evaporation surface and realising zero energy loss during solar evaporation.

This heatsink technique means all surfaces of the evaporator remain at a lower temperature than the surrounding water and air, so additional energy flows from the higher-energy external environment into the lower-energy evaporator.

The team are the first researchers in the world to extract energy from the bulk water during solar evaporation and use it for evaporation, and this has helped their process become efficient enough to deliver between 10 and 20 litres of fresh water per square metre per day.

In addition to its efficiency, the practicality of the system is enhanced by the fact it is built entirely from simple, everyday materials that are low cost, sustainable and easily obtainable.

The main aim of their research was to deliver for practical applications, so the materials we used were just sourced from the hardware store or supermarket, Assoc Prof Xu said. “The only exception is the photothermal materials, but even there we are using a very simple and cost-effective process, and the real advances we have made are with the system design and energy nexus optimisation, not the materials.”

In addition to being easy to construct and easy to deploy, the system is also very easy to maintain, as the design of the photothermal structure prevents salt and other contaminants building up on the evaporator surface. Together, the low cost and easy upkeep mean the system developed by the team could be deployed in situations where other desalination and purification systems would be financially and operationally unviable.

In remote communities with small populations, for example, the infrastructure cost of systems like reverse osmosis often too great to justify. However, the team’s technique could deliver a very low-cost alternative that would be easy to set up and essentially free to run. Moreover, as the system is simple and requires virtually no maintenance, there is no technical expertise needed to keep it running and upkeep costs are minimal.

Assoc Prof Xu stated that the technology has the potential to provide a long-term clean water solution to people and communities who can’t afford other options, and these are the places such solutions are most needed. In addition to drinking water applications, the team is currently exploring a range of other uses for the technology, including treating wastewater in industrial operations.

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