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Adsorbent
Treated
water
Loose sorbent method
FIGURE 17.7
Schematic of loose sorbent technique for domestic rural water deluoridation.
Treated water was then evaluated for its luoride content and other physicochemical
parameters to check its potability.
17.7.7.2.2 Sachet Technique
The method involves simple stirring of a tea bag-type sachet, containing adsorbent mate-
rial for application in the ield for domestic deluoridation. A prepacked sachet technique
using a controlled dose for the removal of luoride from a pot of water would be appropri-
ate to facilitate maintaining an exact amount of adsorbent for treatment. A predeined con-
trolled dose would facilitate the effective use of adsorbents in an uncomplicated manner
by the user. For treatment of larger volumes of water, an appropriate dose of adsorbent in
multiple sachets may be used. This method involves stirring of adsorbent packed sachets
for 10-15 min (Figure 17.8).
17. 7. 7. 2 . 3 B a m b o o C o lu m n Te c h n i q u e
A bamboo column as shown in Figure 17.9 is closed at the bottom. The bamboo is illed
with a layer of ine sand and a top layer with adsorbent. Water is fed through the top from
a pot with an optimum low rate. This treatment may be suitable for overnight treatment
for a volume of water suficient for a family. The residence time in the column was about
10 min but will depend on the input luoride concentration.
Sachet
Adsorbent
Water
Sachet
FIGURE 17.8
Schematic of Sachet-based technique for domestic rural water deluoridation.
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