Deactivated filters in activated carbon method for defluoridation can be activated by:

defluoran-1 and defluoran-2

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lime, bleaching powder and alum

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4 %

N a O H

and

1 %

H_{3} P O_{4}

solution

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4 %

N a C l

and

5 %

H_{2} S O_{4}

solution

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Solution

The correct option is C $4 %$ $N a O H$ and $1 %$ $H_{3} P O_{4}$ solution
Activated charcoal can adsorb organic substance like DDT & Endrin. Ion exchange resins remove certain dyes & chlorinated pesticides. Deactivated charcoal can be activated again by treating with $4 %$ $N a O H$ followed by $1 %$ $H_{3} P O_{4}$ .
In this method, the fluoride ion concentration can be reduced from $5 - 12$ ppm to $1$ ppm.

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N H_{3}

N a O H

H_{2} O_{2}

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