Abstract
Microcystins (MCs) are dangerous toxins produced by cyanobacteria in eutrophic waters, that are increasingly used worldwide for human consumption after potabilization. In this study, we present the results of laboratory and pilot-plant experiments, aimed at deepening the knowledge of the mechanisms governing the equilibrium of dissolved and particulate-bound MCs, and exploring the possible use of ultrafi ltration (UF) for their removal from eutrophic water within the potabilization treatment. Firstly, we analysed the presence of MCs in filtered water after three months of pure culture of Microcystis aeruginosa and different cycles of freezing and thawing, showing an increase of dissolved MCs due to cell breakage caused by the refrigeration cycles. Secondly, we performed filtration tests in a pilot UF plant, using samples of demineralised water and raw water from a eutrophic lake, both spiked with MCs. The tests demonstrated the possibility to remove MCs by adsorption rather than by mechanical seizing. The...
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