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sur le développement des zones arides et semi-arides

Titre : Problems during drinking water treatment of cyanobacterial loaded surface waters : consequences for human health

Auteur : Höger, Stefan J

Université de soutenance : Universität Konstanz

Grade : Doktor der Naturewissenschaften 2003

Résumé
No life without water. Indeed, the human being is not content with this simple maxim any more. Drinking water must fulfil distinct criteria of appearance, smell and taste. The exponential population growth and the subsequent problems with environmental pollution endanger the supply of inoffensive and healthy drinking water. Analytical improvements have enabled the detection of potential harmful organisms and molecules in drinking water : cyanobacteria and metabolites synthesised by these organisms were proven to cause illnesses in humans. Different organ systems can be affected by these secondary metabolites. The best investigated cyanobacterial toxins are alkaloids (saxitoxins, anatoxin-a, cylindrospermopsin) and polypeptides (microcystins, nodularins). To avoid risks to human health, an appropriate drinking water treatment is necessary. In one part of this study a laboratory-scale drinking water treatment system was built to mimic the processes in water works, which ought to remove cyanobacteria and their toxins from drinking water. Therefore, an ozonation and a variety of filtration steps were installed and their respective efficacies regarding the elimination of pure microcystin-LR (MC-LR), extracts and cells of Planktothrix rubescens and Microcystis aeruginosa from raw water were investigated

Mots clés : cyanobacteria , drinking water , cyanotoxins , microcystin , risk assessment

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