Ribau Teixeira, MargaridaRosa, Maria João2012-05-102012-05-102011Margarida Ribau Teixeira; Rosa, Maria João. Adsorption of microcystins and anatoxin-a on nanofiltration membranes. Trabalho apresentado em 6th IWA Specialist Conference on Membrane Technology for Water & Wastewater Treatment. In Proceedings of the 6th IWA Specialist Conference on Membrane Technology for Water & Wastewater Treatment, Aachen, 2011.http://hdl.handle.net/10400.1/1127This work pretends to study the adsorption of microcystin-LR (MC-LR) and anatoxin-a (ATX-a) on nanofiltration membranes and to understand the adsorption behaviour with the solution chemistry (background natural organic matter (NOM) and in the presence of ATX-a). Results demonstrate that MC-LR adsorption increases with water recovery due to the increase in MC-LR feed concentration. MC-LR adsorption is governed by hydrophobic interactions established between the membrane surface and the MC-LR molecules, and between the MC-LR molecules. For ATX-a, adsorption onto the membrane surface is governed by electrostatic attractions and the background NOM minimises the ATX adsorption. When ATX-a and MC-LR are both present in water, adsorption is higher for ATX-a than for MC-LR and is higher at pH 4 for both cyanotoxins.engconference object2012-05-10