The lowest low-cost system: ...
Published by Thomas Helle, CEO at Novis
The lowest low-cost system: for a population of 2.000 @ 3 l of water per person per day you must clean 6.000 l of water.
The following could be done with buckets, cans or with drums.
1. Gravel filter: fill vessel with gravel, let the water go in from the top, take the water out from the bottom.
2. Sand filter: same as step 1. If you put the vessel from step one higher than the sand filter, you need no pump.
After 100 l (approximation) you should back-flush both filters. Discard the back-flush water.
3. Put the water in empty, transparent PP bottles and expose to sun for 6 hours (recommendation of WHO). Also suitable are glas containers/flasks or PP bags.
In case, there is no sun, you need an UV flow through debacterisation (could be manufactured with low cost by yourself).
Attention: this method cleans and sterilizes only slightly dirty water. It removes not oil or potentially hazardous chemicals.
1 Comment
Insted terafil water filter does what was explained above in one go. Simple consolidated water purifier(watsan.in)
Published by Chandrasekaran J., Founder Director at Watsan Envirotech private Limited