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AWWA ACE94123
- Influence of Municipal Wastewaters on the Composition of Background Organics in the Seine River: Consequences for the Production of Drinking Water
- Conference Proceeding by American Water Works Association, 01/01/1994
- Publisher: AWWA
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The situation described in this paper can be extrapolated to many other urban areas, whenever the rivers flowing through them are used both to receive the effluents resulting from human activity and to produce drinking water. As far as the Paris area is concerned, the data available clearly reveal that anthropogenic organic matter represents a substantial proportion of the Seine river DOC, downstream of Paris. The influence of this organic matter on drinking water production is visible when comparing the operational costs of a treatment line comprising clarification, ozonation and GAC filtration is raised from 0.25 F/m3 to 0.38 F/m3. The increase is partly due to higher reagent costs; an average coagulant dose of 50 g/m3 is used at Morsang while 80 g/m3 are required at le Mont Valerien to reach the treatment optimum. Unlike the Morsang plant, the le Mont Valerien plant also uses a preozonation step which slightly raises the overall cost of the oxidation process. However, most of the cost increase is due to the higher GAC regeneration frequency required at le Mont Valerien to reach the same treatment objective (DOC < 1 ppm, pesticides < 0.1 ug/l).
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