University at Buffalo scientists with little more than sunlight and plastic, added a third element, carbon-dipped paper, to create a highly efficient and inexpensive way to turn saltwater and contaminated water into potable water for personal use. The system could help address global drinking water shortages, especially in developing areas and regions affected by natural disasters.
Lead researcher Qiaoqiang Gan, PhD, associate professor of electrical engineering in the University at Buffalo School of Engineering and Applied Sciences said, “Using extremely low-cost materials, we have been able to create a system that makes near maximum use of the solar energy during evaporation. At the same time, we are minimizing the amount of heat loss during this process.”
To conduct the research, the team built a small-scale solar still. The device, which they call a “solar vapor generator,” cleans or desalinates water by using the heat converted from sunlight. Here’s how it works: The sun evaporates the water and during this process, salt, bacteria or other unwanted elements are left behind as the liquid moves into a gaseous state. Then the water vapor then cools and returns to a liquid state, where it is collected in a separate container without the salt or contaminants.
Haomin Song, PhD candidate at UB and one of the study’s leading co-authors explains, “People lacking adequate drinking water have employed solar stills for years, however, these devices are inefficient. For example, many devices lose valuable heat energy due to heating the bulk liquid during the evaporation process. Meanwhile, systems that require optical concentrators, such as mirrors and lenses, to concentrate the sunlight are costly.”
The UB-led research team addressed these issues by creating a solar still about the size of mini-refrigerator. It’s made of expanded polystyrene foam (a common plastic that acts as a thermal insulator and, if needed, a flotation device) and porous paper coated in carbon black. Like a napkin, the paper absorbs water, while the carbon black absorbs sunlight and transforms the solar energy into heat used during evaporation.
The solar still coverts water to vapor very efficiently. For example, only 12 percent of the available energy was lost during the evaporation process, a rate the research team believes is unprecedented. The accomplishment is made possible, in part, because the device converts only surface water, which evaporated at 44º C.
Based upon test results, researchers believe the still is capable of producing 3 to 10 liters of water per day, which is an improvement over most commercial solar stills of similar size that produce 1 to 5 liters per day.
Materials for the new solar still cost roughly $1.60 per square meter – a number that could decline if the materials were purchased in bulk. (By contrast, systems that use optical concentrators can retail for more than $200 per square meter.) If commercialized, the device’s retail price could ultimately reduce a huge projected funding gap – $26 trillion worldwide between 2010 and 2030, according to the World Economic Forum – needed for water infrastructure upgrades.
Zhejun Liu, a visiting scholar at UB, PhD candidate at Fudan University and one the study’s co-authors said, “The solar still we are developing would be ideal for small communities, allowing people to generate their own drinking water much like they generate their own power via solar panels on their house roof.”
Additional members of the research team are from UB’s Department of Chemistry, Fudan University in China, the University of Wisconsin-Madison and the lab of Gan, who is a member of UB’s New York State Center of Excellence in Materials Informatics and UB’s RENEW Institute, an interdisciplinary institute dedicated to solving complex environmental problems.
Funding came in part, by the U.S. National Science Foundation, the National Science Foundation of China and the Chinese Scholarship Council.
This work shows just how some innovation and creativity can make a major improvement in the human condition. For those of us with internet connections and devices to pull an immense array of data, the very idea of getting clean potable water each day that is safe to drink is almost unimaginable.
This is solar power at its most very basic application. Fantastically efficient, low cost and looking to be easy to build, one hopes millions of these get made and soon. Congratulations to this team! Come on, can this be beat?