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In tertiary water treatment,for the removal of pathogens which substance can be used?

$\begin{array}{1 1}(a)\;\text{UV}\\(b)\;\text{Ozone}\\(c)\;\text{Perchlorate}\\(d)\;\text{All of these}\end{array} $

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UV,ozone,perchlorate.
Hence (d) is the correct answer.
answered Apr 2, 2014 by sreemathi.v
 
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