A new process for water filtration using carbon dioxide consumes one thousand times less energy than conventional methods, scientific research published recently has shown.
The research was led by Dr Orest Shardt of University of Limerick, Ireland together with Dr Sangwoo Shin (now at University of Hawaii, Manoa), while they were post doctoral researchers at Princeton University (United States) last year.
With global demand for clean water increasing, there is a continuing need to improve the performance of water treatment processes. Dr Shardt expects this new method which uses CO2 could be applied in a variety of industries such as mining, food and beverage production, pharmaceutical manufacturing and water treatment.
The research, published in open-access scientific journal Nature Communications, indicates that the new process could be easily scaled up, “suggesting the technique could be particularly beneficial in both the developing and developed worlds”. The new method could also be used to remove bacteria and viruses without chlorination or ultraviolet treatment.
“We are at the early stages of developing this concept. Eventually, this new method could be used to clean water for human consumption or to treat effluent from industrial facilities,” Dr Shardt stated.
Currently, water filtration technologies such as microfiltration or ultrafiltration use porous membranes to remove suspended particles and solutes. These processes trap and remove suspended particles, such as fine silt, by forcing the suspension through a porous material with gaps that are smaller than the particles. Energy must be wasted to overcome the friction of pushing the water through these small passages. These kinds of filtration processes have drawbacks such as high pumping costs and a need for periodic replacement of the membranes due to fouling. The research by Drs Shardt and Shin demonstrates an alternative membraneless method for separating suspended particles that works by exposing the colloidal suspension to CO2.
“The demonstration device is made from a standard silicone polymer, a material that is commonly used in microfluidics research and similar to what is used in household sealants. While we have not yet analysed the capital and operating costs of a scaled-up process based on our device, the low pumping energy it requires, just 0.1% that of conventional filtration methods, suggests that the process deserves further research,” said Dr Shardt.
“What we need to do now is to study the effects of various compounds, such as salts and dissolved organic matter that are present in natural and industrial water to understand what impact they will have on the process. This could affect how we optimise the operating conditions, design the flow channel, and scale-up the process,” he continued.
Since joining the €86 million Bernal Institute at University of Limerick last September, Dr Shardt is continuing his research on the mathematical modelling and simulation of the water purification process and the physical phenomena on which it is based.
“As a new arrival to Ireland, I’m now looking for motivated PhD students to work with me in this area. I am sure that creative students will find new ways to improve the process and apply it in unexpected ways,” Dr Shardt concluded.
The Latest on: Water filtration with CO2
Hi-tech building services team's cool moves
on July 19, 2018 at 5:52 am
Another eco-friendly by-product of the CO2 refrigeration process is chilled water, which is being diverted to cool ... electrostatic and carbon filtration are combined in the huge kitchens to ensure e... […]
Irish Cement is changing the mix to curb fossil fuels and reduce carbon emissions
on July 18, 2018 at 4:30 pm
Being allowed pursue this route which is a change of fuel, not change of use, he underlines “will reduce Platin’s dependence on imported fossil fuels, reduce carbon dioxide emissions ... material on t... […]
Two New Water Jacketed CO2 Incubators Introduced
on July 18, 2018 at 6:10 am
The Closed Loop HEPA Filtration system produces an environment similar ... where the growth chamber is surrounded by heated water and monitored and CO2 Gas Accuracy, where a dual wave infrared sensor ... […]
What Is Dry Cleaning?
on July 17, 2018 at 4:21 pm
Filters that trap solid impurities and soils removed ... is phasing out the use of perc in dry cleaning in favor of less-toxic choices, including water-based and carbon dioxide cleaning. Since high sc... […]
New greenhouses producing tomatoes slated to open this fall in Cummings Valley
on July 12, 2018 at 4:30 pm
If it's bright and sunny, plants are breathing carbon dioxide, so hot water that the boilers have ... The acreage doesn’t just have greenhouses, it also includes a cold storage, water filtration secti... […]
via Google News and Bing News