Changes

Iron filter

1 byte removed, 03:38, 18 September 2012

→‎Biologically-enhanced method

'''Head requirements and the need for ballast'''<br>

The head needed to deliver an acceptable flow rate of 0.2-0.3 l/s in unclogged sand is 50 mm. This will increase as the filter clogs. To raise the water level from the top of the sand to a height of 50 mm requires 50 l of water to be pumped (assuming 1 m2 surface area), and therefore it would take 3 minutes of pumping just to reach the desired flow rate. This delay may be largely overcome by adding ballast to the filter. In our a Ugandan trial , water-filled plastic bags were used as ballast. This approach worked well, taking only 29% more time to fill a jerrycan from the filter than it took directly from the handpump. It may be possible to improve this performance but further work is needed to assess the effect of ballast on the iron removal process.

'''Aeration'''<br>

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Winona

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