Low-cost device — shaped like a birdhouse — could help provide drinking water to people affected by natural disasters
The idea of using energy from the sun to evaporate and purify water is ancient. The Greek philosopher Aristotle reportedly described such a process more than 2,000 years ago.
Now, researchers are bringing this technology into the modern age, using it to sanitize water at what they report to be record-breaking rates.
By draping black, carbon-dipped paper in a triangular shape and using it to both absorb and vaporize water, they have developed a method for using sunlight to generate clean water with near-perfect efficiency.
“Our technique is able to produce drinking water at a faster pace than is theoretically calculated under natural sunlight,” says lead researcher Qiaoqiang Gan, PhD, associate professor of electrical engineering in the University at Buffalo School of Engineering and Applied Sciences.
As Gan explains, “Usually, when solar energy is used to evaporate water, some of the energy is wasted as heat is lost to the surrounding environment. This makes the process less than 100 percent efficient. Our system has a way of drawing heat in from the surrounding environment, allowing us to achieve near-perfect efficiency.”
The low-cost technology could provide drinking water in regions where resources are scarce, or where natural disasters have struck. The advancements are described in a study published on May 3 in the journal Advanced Science.
The project, funded by the National Science Foundation (NSF), was a collaboration between UB, Fudan University in China and the University of Wisconsin-Madison. UB electrical engineering PhD graduate Haomin Song and PhD candidate Youhai Liu were the study’s first authors.
Gan, Song and other colleagues have launched a startup, Sunny Clean Water, to bring the invention to people who need it. With support from the NSF Small Business Innovation Research program, the company is integrating the new evaporation system into a prototype of a solar still, a sun-powered water purifier.
“When you talk to government officials or nonprofits working in disaster zones, they want to know: ‘How much water can you generate every day?’ We have a strategy to boost daily performance,” Song says. “With a solar still the size of a mini fridge, we estimate that we can generate 10 to 20 liters of clean water every single day.”
Modernizing an age-old technology
Solar stills have been around for a long time. These devices use the sun’s heat to evaporate water, leaving salt, bacteria and dirt behind. Then, the water vapor cools and returns to a liquid state, at which point it’s collected in a clean container.
The technique has many advantages. It’s simple, and the power source — the sun — is available just about everywhere. But unfortunately, even the latest solar still models are somewhat inefficient at vaporizing water.
Gan’s team addressed this challenge through a neat, counterintuitive trick: They increased the efficiency of their evaporation system by cooling it down.
A central component of their technology is a sheet of carbon-dipped paper that is folded into an upside-down “V” shape, like the roof of a birdhouse. The bottom edges of the paper hang in a pool of water, soaking up the fluid like a napkin. At the same time, the carbon coating absorbs solar energy and transforms it into heat for evaporation.
As Gan explains, the paper’s sloped geometry keeps it cool by weakening the intensity of the sunlight illuminating it. (A flat surface would be hit directly by the sun’s rays.) Because most of the carbon-coated paper stays under room temperature, it can draw in heat from the surrounding area, compensating for the regular loss of solar energy that occurs during the vaporization process.
Using this set-up, researchers evaporated the equivalent of 2.2 liters of water per hour for every square meter of area illuminated by the regular sun, higher than the theoretical upper limit of 1.68 liters, according to the new study. The team conducted its tests in the lab, using a solar simulator to generate light at the intensity of one regular sun.
“Most groups working on solar evaporation technologies are trying to develop advanced materials, such as metallic plasmonic and carbon-based nanomaterials,” Gan says. “We focused on using extremely low-cost materials and were still able to realize record-breaking performance.
“Importantly, this is the only example I know of where the thermal efficiency of the solar evaporation process is 100 percent when you consider solar energy input. By developing a technique where the vapor is below ambient temperature, we create new research possibilities for exploring alternatives to high-temperature steam generation.”
The Latest on: Water purification
via Google News
The Latest on: Water purification
- The Best Water-Treatment Systems on September 18, 2018 at 12:53 pm
Turning on the spigot to fill a large metal pot of water at the Eiseman Hut, I was thirsty and just assumed it was clean. The 10-mile skin into the 11,180-foot backcountry lodge left me high and dry w... […]
- Shimla to get 24-hour water by 2021: Thakur on September 18, 2018 at 12:03 pm
The work would be completed by February next. In order to provide quality drinking water to residents, upgrade of water treatment plant (UV treatment and chlorination) would be completed by March next ... […]
- Municipalities get funding for water, sewer upgrades on September 18, 2018 at 10:52 am
WEST CHESTER (September 18, 2018)– State Senator Andy Dinniman announced that eight Chester County municipalities will receive more than $1.9 million in total state funding for improvements to water a... […]
- Phoenixville Gets $154K Grant To Improve Water Treatment Plant on September 18, 2018 at 8:53 am
PHOENIXVILLE, PA — Phoenixville will receive a grant to significantly improve the operations at its water treatment plant, local officials announced Tuesday. The $154,836 in funding will be used ... […]
- Global Water and Wastewater Treatment Technologies & Markets Report 2018 - ResearchAndMarkets.com on September 18, 2018 at 6:49 am
DUBLIN--(BUSINESS WIRE)--Sep 18, 2018--The "Water and Wastewater Treatment Technologies: Global Markets" report has been added to ResearchAndMarkets.com's offering. This study evaluated the demand ... […]
- The Importance Of pH Measurement During Industrial Treatment on September 18, 2018 at 5:36 am
Nearly every industry requires water and wastewater treatment to some degree. From food and beverage to pulp and paper operations, influent and effluent must meet certain conditions to adhere to regul... […]
- Global Water Treatment Chemicals Market Forecast to Grow at a CAGR of 6.18% by 2023 on September 17, 2018 at 12:29 pm
Albany, NY -- (SBWIRE) -- 09/17/2018 -- A comprehensive research report created through extensive primary research (inputs from industry experts, companies, stakeholders) and secondary research, the r... […]
- Water and Wastewater Treatment Technologies: Global Markets on September 17, 2018 at 8:35 am
Read the full report: https://www.reportlinker.com/p0461664 This study evaluated the demand for 11 generic types of products commonly used by owners and operators of water and wastewater treatment fac... […]
- Hitachi Zosen Receives Order From China For Marimo Rapid Fiber Filtration System: Our First For Sewage Treatment Plants Overseas on September 17, 2018 at 3:38 am
Client: China National Electric Apparatus Research Institute Co., Ltd. 2. Project: Improvement works for the water treatment plant, East District, Guangzhou Development Zone 3. Delivered to: Water tre... […]
via Bing News