Particle separation in water treatment can be enhanced by preoxidation with different chemicals. Effects were reported for preoxidation by ozone, chloride, chlorine dioxide, permanganate and chloramines. The observations depend on the raw water source, season, oxidant dosage and the applied particle separation processes. Most research interest has found preozonation for particle removal and the underlying mechanisms. The literature of the last decades include several mechanisms thought to be responsible for the observed effects. A significant role is played by the natural organic matter (NOM) in view of its efficiency in stabilizing dispersed particles by adsorption and by its reactions with the coagulants. Preozonation effects in algae-laden waters are important but require further studies.

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