Abstract
The plant of Mont-Valérien supplies drinking water to the western suburbs of Paris. The plant has been upgraded, including a preozonation step. The plant has been operated with different doses of ozone applied during the preozonation step, and with different doses of coagulant for clarification. The purpose of that field test was to determine the best operating conditions to obtain the minimum of algae cells in the treated water. The results show that the minimum of algae cell count is obtained when the coagulant dose nullifies the zeta potential, and with an optimum dose of ozone.

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