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ETH student develops filter for clean water around the world
Date:7/23/2014

Roughly 780 million people around the world have no access to clean drinking water. According to the World Health Organization (WHO), 3.4 million people die from water-related diseases every year. ETH student Jeremy Nussbaumer set himself the goal of making a contribution to solving this problem. Working with researchers from a group led by Wendelin Stark, head of the Functional Materials Laboratory, the 23-year-old spent a year researching a membrane filter and developing a prototype.

"What makes our DrinkPure filter unique is that you can screw it on to virtually any plastic bottle. It doesn't require a pump or a reservoir, so it's very easy to use," explains the student from the canton of Aargau. "You simply screw the filter onto a bottle containing polluted water, then you can put it straight in your mouth and take a drink." Weighing less than 100 grams, DrinkPure is considerably lighter than most other filters, and the flow pressure is so high that you can purify as much as a litre of water in a minute just by squeezing the bottle with your hand. Another benefit is that the unit is less expensive and easier to manufacture than most conventional filters. These qualities, says Nussbaumer, make the filter ideal for development aid projects.

Three-stage filter system with special Membrane

Three filtering stages make DrinkPure one of the most reliable devices currently on the market. First, a pre-filter captures large particles such as sand and plant fragments; the second stage consists of an activated charcoal powder that primarily removes undesirable odours and chemical contaminants; the third and most important part of the filter is a polymer membrane that removes bacteria. In fact, this membrane does its job more reliably than virtually any other water filter intended for outdoor use.

Two ETH doctoral students developed this polymer membrane and patented it three years ago. It is based on a new manu
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Contact: Media Releations ETH Zurich
mediareleations@hk.ethz.ch
41-446-324-141
ETH Zurich
Source:Eurekalert  

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