Algae extract forms filter for safe drinking water

Scientists from Uppsala University, Sweden, and Dhaka University, Bangladesh, have shown that cellulose nanofibres can be extracted from Pithophora algae which can be formed into filters with tailored pore sizes.

The performance of the filter has been validated using surrogate latex nanobeads, in vitro model viruses, and water samples collected from the Turag River and Dhanmondi Lake in Dhaka.

“Pithophora algae have been largely overlooked in the past as a valuable raw material. It is with great satisfaction that we can now document excellent pathogen removal clearance for both water-borne bacteria and viruses with efficiency above 99.999 per cent. It can purify even the smallest virus particles of 27-28 nanometres”, said Albert Mihranyan, Professor of Nanotechnology at Uppsala University, who heads the study.

By 2050, projected growth rates suggest that the population of Bangladesh may reach 200-225 million people. In parts of Dhaka or Chittagong, Bangladesh’s largest cities, the density of population is as high as 205,000 inhabitants/km2. Hyper-high density of population, poor hygiene, and lack of clean water increase the risk of spreading water-borne infections.