Tag Archive for 'water filtering'

Ground Glass Solution for Cleaner Water

retrieved from: sciencedaily.com

“British science has led to a use for waste glass that cannot be recycled that could help clean up polluted waterways by acting as an ion-exchange filter to remove lead, cadmium and other toxic metals.

“Only a fraction of waste glass bottles and jars can be recycled, partly because much of the glass is coloured, brown or green, and partly because the market sustains only a limited weight of recyclable glass. Millions of tonnes of waste container glass are generated across Europe. As such, large amounts of waste glass, purportedly for recycling, are shipped to China and elsewhere to be ground up and used as hardcore filling materials for road building.

“Now, Nichola Coleman of the University of Greenwich, London, has developed a simple processing method for converting waste container glass, or cullet, into the mineral tobermorite. Tobermorite is hydrated calcium silicate, silicate being the main material that can be extracted from glass. In the form produced, the phase-pure 11-angstrom form — the mineral can be used as an ion-exchange material that can extract toxic lead and cadmium ions from industrial effluent, waste water streams or contaminated groundwater.”

Read more: Science Daily

Clean water bottle wins UK leg of James Dyson Award

Tim Whitehead shows off his invention

Tim Whitehead is now in the running for a £10,000 prize. Photo retrieved from: BBC

“The water bottle contains two chambers. Dirty water is put in an outer chamber and the inner chamber is plunged through it, filtering water particles as small as four microns.

“Once filtered, the water is sterilised by a wind-up ultraviolet bulb in a process lasting 90 seconds.

“A prototype was effective in killing 99.9% of bacteria and viruses.

“Professor Matthew Harrison, who is one of the judges and also director of education programmes at the Royal Academy of Engineering, commented: “Pure provides a practical solution to a real problem – how to get clean drinking water in the most hostile of conditions.

“It has the potential to make a real difference to people’s lives.”

read more: BBC