Tuesday April 23, 2019

New Technology That Can Clean Water Twice As of Now

more than one in 10 people in the world lack basic drinking water access, and by 2025, half of the world's population will be living in water-stressed areas.

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Novel technology cleans water using bacteria

Researchers, led by one of Indian-origin, have developed a new technology that can clean water twice as fast as commercially available ultrafiltration membranes, an advance that brings hope for countries like India where clean drinking water is a big issue.

According to a team from the Washington University in St. Louis, more than one in 10 people in the world lack basic drinking water access, and by 2025, half of the world’s population will be living in water-stressed areas.

The team led by Srikanth Singamaneni, Professor at the varsity, developed an ultrafiltration membrane using graphene oxide and bacterial nanocellulose that they found to be highly efficient, long-lasting and environment-friendly.

The membrane technology purifies water while preventing biofouling, or build up of bacteria and other harmful micro-organisms that reduce the flow of water.

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The membrane technology purifies water while preventing biofouling. VOA

For the study, published in the journal Environmental Science and Technology, they used bacteria to build such filtering membranes.

The Gluconacetobacter hansenii bacteria is a sugary substance that forms cellulose nanofibres when in water.

The team then incorporated graphene oxide (GO) flakes into the bacterial nanocellulose while it was growing, essentially trapping GO in the membrane to make it stable and durable.

They exposed the membrane to E. coli bacteria, then shone light on the membrane’s surface.

After being irradiated with light for just three minutes, the E. coli bacteria died. The team determined that the membrane quickly heated to above the 70 degrees Celsius required to deteriorate the cell walls of E. coli bacteria.

While the bacteria are killed, the researchers had a pristine membrane with a high quality of nanocellulose fibres that was able to filter water twice as fast as commercially available ultrafiltration membranes under a high operating pressure.

When they did the same experiment on a membrane made from bacterial nanocellulose without the reduced GO, the E. coli bacteria stayed alive.

The new technology is capable of identifying and quantifying different kinds of cyanobacteria, or blue-green algae, as a threat to shut down water systems when it suddenly proliferates. Pixabay

While the researchers acknowledge that implementing this process in conventional reverse osmosis systems is taxing, they propose a spiral-wound module system, similar to a roll of towels.
Also Read: India Gets Assistance of Rs 3,420 Crore From Japan
It could be equipped with LEDs or a type of nanogenerator that harnesses mechanical energy from the fluid flow to produce light and heat, which would reduce the overall cost.

If the technique were to be scaled up to a large size, it could benefit many developing countries where clean water is scarce, the researchers noted. (IANS)

Next Story

Now The Hackers May Want To Crack Down What You Stream on Netflix

While Netflix contended that carrying out such an attack would not be easy as it requires access to network traffic for analysis, the IIT Madras researchers pointed out that tricking users into connecting to rogue routers or access points is quite possible for hackers.

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"I work on analysis of encrypted network traffic, and when we stumbled upon this Netflix movie Bandersnatch it was something very new," Gargi Mitra, a PhD student at IIT Madras was quoted as saying by the WIRED. Pixabay

Despite Netflix’s move to encrypt all its video streams in order to better protect user privacy, hackers may still get to know what interactive content you watch on the popular streaming service, new research from the Indian Institute of Technology (IIT) Madras suggests.

The researchers said that they can analyse Netflix’s encrypted interactive video traffic to find clues about the viewing habits of users, and which choices they have made in their movie journeys, the WIRED reported on Sunday.

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Analysing the choices that 100 viewers made, the researchers were able to determine the decisions correctly 96 per cent of the time, the report said Pixabay

The interactive content on Netflix allows users to make choices for the characters and shape the story. Each choice leads to a different adventure, so users can watch again and again, and see a new story each time. Black Mirror: Bandersnatch and You vs. Wild are some of the interactive titles that Netflix has.

“I work on analysis of encrypted network traffic, and when we stumbled upon this Netflix movie Bandersnatch it was something very new,” Gargi Mitra, a PhD student at IIT Madras was quoted as saying by the WIRED.

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The researchers said that they can analyse Netflix’s encrypted interactive video traffic to find clues about the viewing habits of users, and which choices they have made in their movie journeys, the WIRED reported on Sunday. Pixabay

“But when I was looking at the choice-making interactions it turned out that they are similar to other kinds of interactions in web applications and web sites I study. So I tried out some of my techniques and we were able to determine which options the viewer chooses,” Mitra added.

Also Read: Research Reveals, Cancer Patients Are More Likely To Use Marijuana
While Netflix contended that carrying out such an attack would not be easy as it requires access to network traffic for analysis, the IIT Madras researchers pointed out that tricking users into connecting to rogue routers or access points is quite possible for hackers.

Analysing the choices that 100 viewers made, the researchers were able to determine the decisions correctly 96 per cent of the time, the report said. (IANS)