| DWC makes drinking water out of rain water using new designed floating UV desinfection for school in Ethiopia | Wednesday, 20. October 2010 |
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| DWC was approached to improve the design of a large underground rain water tank for a school in Ethiopia. During a field trip DWC was happy to give tips on inflow, outflow and overflow techniques and overall design questions of larger scale rain water systems. However, the main problem remained how to improve the quality of the captured rain water and make it save for drinking water purpose especially for kids. The briefing: As usual no budget was available and the system should fit into a suitcase for the next person travelling to deliver into the school. The system should also be easy to be implemented and should not need any servicing. It should be powered by 230V which is available on site via renewable energies/ like wind and solar power but also the option for 24DC powered via two car batteries just in case. Solution: DWC couldn't find any systems with those features at any market. Therefore it was designing with dedicated partner companies a new product based on existing and proven components. A floating intake used in professional rain water systems was combined with high power radiation but low power consuming UV lamp. Complemented by an energy efficient pump and a simple but high quality tab it is possible to have now desinfected rain water. So the outside installed pump will suck the rain water from the cistern, passes it via the UV lamp (no need to UV the whole cistern) and keeps the pressure until the outside tab. Once you open the tab, the pump starts pumping and fresh, desinfected rain water is available for drinking purposes. Simple and straight forward. A big thanks to: the foundation sponsoring the hardware (non profit hardware supply), to Wim initiating the project and bringing the hardware in his luggage to the school and briefing local people how to install it (and Wim is really no engineer :-) ), to the local community drinking desinfected water with still no health problems reported, to Carsten selecting and supplying the right pump, to Ulrich and his team to modify the UV lamp and finally to Nico and his team putting it altogether. You all enabled 350 school kids safe drinking water and less pain in their already tough life. Some picture likes these should give some ideas of the installation       |
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