“…Once the level of dichlorvos in raw waters does not meet regulations, additional treatment processes have to be applied to comply with the drinking water standards. Treatment methods such as biodegradation (Lieberman and Alexander, 1983), ultrasonication (Schramm and Hua, 2001), adsorption (Lu et al, 1996), photocatalysis (Lu et al, 1993;Evgenidou et al, 2005Evgenidou et al, , 2006, and oxidation with Fenton's reagent and permanganate (Lu et al, 1997(Lu et al, , 1999Waldemer and Tratnyek, 2006) have shown effectiveness on the decomposition of dichlorvos. Among the above various treatment methods, permanganate oxidation is commonly used at water treatment plants due to the stability, ease of handling, wide pH range, and low cost of the oxidant.…”