Removal of N-Nitrosamines by Nanofiltration and Reverse Osmosis Membranes

摘要

The objective of this study was to obtain a better understanding of the rejection and transport behavior of N-nitrosamines through nanofiltration (NF) and reverse osmosis (RO) membranes. Nitrosamine steady-state rejections by NF membranes ranged from 9% to 76%, depending on NF membranes and nitrosamine compounds. As molecular weight increased, nitrosamine rejection increased, with the exception of N-nitrosodiphenylamine (NDPHA). There was no feed concentration effect on nitrosamine rejections with different feed concentrations over three orders of magnitude. RO membranes will be tested for the removal of nitrosamines and experimental data will be applied to mathematical models to determine permeabilities of various nitrosamines through NF and RO membranes.