A Novel Method for Investigating the Influence of Feed Water Recovery on Colloidal and NOM Fouling of RO and NF Membranes
作者： Sangyoup Lee , Jaeweon Cho , Menachem Elimelech
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摘要: A systematic investigation on the role of feed water recovery (or concentration factor) in colloidal and natural organic matter (NOM) fouling reverse osmosis (RO) nanofiltration (NF) membranes is reported. Fouling experiments were conducted using a laboratory-scale crossflow test unit with continuous permeate disposal to simulate factor (CF) as commonly observed full-scale RO/NF systems. With this novel method, deterioration membrane performance due recovery-related osmotic pressure buildup can be distinguished. For RO membranes, so-called "cake enhanced pressure" key mechanism resulting severe decline flux significant decrease salt rejection increasing CF. On other hand, NOM–calcium complexation rather than for NOM NF membranes. The solute increasi...
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