Category Archives: water

Water-powered clocks

 water-clockMrs Green has been pootling around the inter-webby learning about experimental battery storage technology.

On our journey we discovered, via Great Green Gadgets, a clever little clock that is powered by a battery that uses ordinary tap water.

According to Hammacher Schlemmer this little time-keeper can be powered for up to 12 weeks before needing a re-fill. Sadly, it seems that they are no longer selling it. Taking time-out perhaps?

Clean water harvested from fog

In a mountainous area of South Africa’s Limpopo Province, water is harvested from fog-bearing winds.

The Tshiavha Primary School, with the aid of Liesel Dyson and researchers fromharvest-water-from-fog the University of Pretoria and the University of South Africa, has built a six-metre high net that traps 2,500 litres of water per day.  Tshiavha’s elevation faces the fog-bearing winds off the Indian Ocean which is several hundred kilometres away.

Three six-metre-high wooden poles are set up nine metres apart, and water drops are caught by a double layer of 30 percent shade cloth draped over steel cables that are stretched horizontally between the poles.  The water is collected in a gutter than runs along the bottom of the shade cloth and this channels the water into a storage tank.  Read more about it here.

Ultraviolet water purifying bottle

UV water filterThe winner of the UK James Dyson Award, Timothy Whitehead, has designed a water bottle that uses ultraviolet (UV) light to sterilise drinking water anywhere in about 2 minutes.

The bottle has an inner and an outer chamber. The outer chamber is filled with dirty water and the inner chamber plunges through it and filters water particles as small as four microns. The clear water then takes about 90 seconds to sterilise by using a wind-up ultra-violet bulb.  Apparently tests show that it sterilises 99.9% of bacteria and viruses.  Wow!

Clean water with solar energy

The Aquapak can heat water to temperatures beyond 65 degrees Celsius using only solar energy. This ends the existence of all water-borne nasties like bacteria, viruses and parasites.

4 to 5 litres of water can take as little as 2 hours to pasturise.  solar-water-purifierThere’s a reusable sealed glass tube indicator filled with colored wax that melts when heated to the required temperature to pasteurise the water.

According to this page it is designed to be mass-produced in developing countries for less than $2.00US.  Envirogadget has more information here.  I could get into this type of hot water …

Clean water with a tea bag – South African style

Clean waterI’ve been looking at water purification innovations  and am proud to announce that Stellenbosch University has developed a nifty little device based on  the same material used for the tea bag that is used for a local herbal infusion favourite – Rooibos (Redbush) tea. With added nano-technology goodness.

Yes – it’s a teabag that works in reverse.  Inside it are very thin nanoscale fibres that filter out contaminants as well as bacteria-killing charcoal.  Learn more about it here, here, here and here. And video goodness here. I’ll put the kettle on.