POST Online Media Lite Edition



 

NEWLY REPORTED COVID-19 CASES (11.19.2021, 4:50pm CEST, WHO):   India 11,106    Brazil 11,977    United Kingdom 46,858    Russia 37,156    Turkey 22,234    France 19,840    Argentina 1,553    Germany 52,970    Spain 3,932    Columbia 2,257    Italy 10,645    Mexico 3,836    Ukraine 20,050    Poland 23,242    Philippines 1,297    Malaysia 6,380    Netherlands 23,680    Peru 1,370    Thailand 6,855    Czechia 13,374    Canada 2,448    Romania 3,076    Chile 2,611    Serbia 3,219    Sweden 1,210    Portugal 2,398    Vietnam 10,223    Kazakhstan 1,272    Austria 14,212    Hungary 11,289    Greece 7,276    Georgia 4,278    Bulgaria 2,785    Belarus 1,844    Slovakia 7,418    Azerbaijan 2,124    Croatia 7,270    Bolivia 1,119    Ireland 4,646    Lithuania 1,847    Denmark 4,013    South Korea 3,034    Slovenia 3,662    Latvia 1,221    Laos 1,401    China 31    New Zealand 200    Australia 1,302   

Cheap mille-feuille-filter removes viruses from water

Staff writer |
A simple paper sheet made by scientists at Uppsala University can improve the quality of life for millions of people by removing resistant viruses from water.

Article continues below






The sheet, made of cellulose nanofibers, is called the mille-feuille filter as it has a unique layered internal architecture resembling that of the French puff pastry mille-feuille (English translation thousand leaves).

"With a filter material directly from nature, and by using simple production methods, we believe that our filter paper can become the affordable global water filtration solution and help save lives. Our goal is to develop a filter paper that can remove even the toughest viruses from water as easily as brewing coffee," says Albert Mihranyan, Professor of Nanotechnology at Uppsala University, who heads the study.

Access to safe drinking water is among the UN's Sustainable Development Goals. More than 748 million people lack access to safe drinking water and basic sanitation.

Water-borne infections are among the global causes for mortality, especially in children under age of five, and viruses are among the most notorious water-borne infectious microorganisms. They can be both extremely resistant to disinfection and difficult to remove by filtration due to their small size.

Today we heavily rely on chemical disinfectants, such as chlorine, which may produce toxic by-products depending on water quality.

Filtration is a very effective, robust, energy-efficient, and inert method of producing drinking water as it physically removes the microorganisms from water rather than inactivates them. But the high price of efficient filters is limiting their use today.

"Safe drinking water is a problem not only in the low-income countries. Massive viral outbreaks have also occurred in Europe in the past, including Sweden, continues Mihranyan referring to the massive viral outbreak in Lilla Edet municipality in Sweden in 2008, when more than 2400 people or almost 20% of the local population got infected with Norovirus due to poor water."

Cellulose is one of the most common filtering media used in daily life from tea-bags to vacuum cleaners. However, the general-purpose filter paper has too large pores to remove viruses. In 2014, the group has described for the first time a paper filter that can remove large size viruses, such as influenza virus.

Small size viruses have been much harder to get rid of, as they are extremely resistant to physical and chemical inactivation. A successful filter should not only remove viruses but also feature high flow, low fouling, and long life-time, which makes advanced filters very expensive to develop.

Now, with the breakthrough achieved using the mille-feuille filter the long awaited shift to affordable advanced filtration solutions may at last become a reality.

Another application of the filter includes production of therapeutic proteins and vaccines.


What to read next

Five viruses, chemical, and metallic element added to carcinogens
The flu
Flu virus hijacking tactics revealed, paving way for new treatments