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High rejection reverse osmosis membrane for removal of N-nitrosamines and their precursors

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Title: High rejection reverse osmosis membrane for removal of N-nitrosamines and their precursors
Authors: Fujioka, Takahiro / Ishida, Kenneth P. / Shintani, Takuji / Kodamatani, Hitoshi
Issue Date: 15-Mar-2018
Publisher: Elsevier Ltd.
Citation: Water Research, 131, pp.45-51; 2018
Abstract: Direct potable reuse is becoming a feasible option to cope with water shortages. It requires more stringent water quality assurance than indirect potable reuse. Thus, the development of a high-rejection reverse osmosis (RO) membrane for the removal of one of the most challenging chemicals in potable reuse – N-nitrosodimethylamine (NDMA) – ensures further system confidence in reclaimed water quality. This study aimed to achieve over 90% removal of NDMA by modifying three commercial and one prototype RO membrane using heat treatment. Application of heat treatment to a prototype membrane resulted in a record high removal of 92% (1.1-log) of NDMA. Heat treatment reduced conductivity rejection and permeability, while secondary amines, selected as N-nitrosamine precursors, were still well rejected (>98%) regardless of RO membrane type. This study also demonstrated the highly stable separation performance of the heat-treated prototype membrane under conditions of varying feed temperature and permeate flux. Fouling propensity of the prototype membrane was lower than a commercial RO membrane. This study identified a need to develop highly selective RO membranes with high permeability to ensure the feasibility of using these membranes at full scale.
Keywords: Heat treatment / N-nitrosamine precursor / Potable water reuse / Reverse osmosis
URI: http://hdl.handle.net/10069/38319
ISSN: 00431354
DOI: 10.1016/j.watres.2017.12.025
Rights: © 2017 Elsevier Ltd. / This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Type: Journal Article
Text Version: author
Appears in Collections:Articles in academic journal

Citable URI : http://hdl.handle.net/10069/38319

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