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NOM can also lead to membrane fouling and therefore to a decrease in filtration flux: this effect is mainly observed in karstic spring areas, after strong rainfall events, snowmelt periods or during winter vertical circulation in lakes.
Reducing NOM in membrane water treatment is therefore doubly important. This goal can be achieved by implementing an in-line dosing of coagulants or powdered activated carbon before the ultrafiltration step.
In a research project supported by the FEON, the effects of these additives on NOM characteristics and membrane fouling are studied together with the water research institute EAWAG.
On the basis of the obtained results, an optimisation of the proposed in-line dosing system should be reached, so that the required additive dose before ultrafiltration may be reduced by 60 to 70% compared to conventional sand filtration plants. |
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