N-nitrosamine rejection by reverse osmosis: Effects of membrane exposure to chemical cleaning reagents

作者：Fujioka Takahiro; Khan Stuart J; McDonald James A; Roux Annalie; Poussade Yvan; Drewes Joerg E; Nghiem Long D^*

来源：Desalination, 2014, 343: 60-66.

DOI：10.1016/j.desal.2013.10.032

• Water reuse
• N-nitrosamines
• Reverse osmosis (RO)
• Chemical cleaning
• N-nitrosodimethylamine (NDMA)

The impact of chemical cleaning on the removal of N-nitrosamines by low pressure reverse osmosis (RO) membranes was investigated. The results show that caustic chemical cleaning resulted in an increase in membrane permeability but caused a notable decrease in the rejection of N-nitrosamines. The impact of caustic chemical cleaning was particularly obvious for N-nitrosodimethylamine (NDMA) and N-nitrosomethylethylamine (NMEA), which have the lowest molecular weight amongst the N-nitrosamines investigated in this study. A correlation between the increase in permeability and the decrease in the rejection of either NDMA or NMEA could be observed. The rejection of conductivity also decreased as the membrane permeability increased, indicating that conductivity rejection can be an indicative parameter of predicting changes in NDMA and NMEA rejection during RO plant operation. The impact of caustic cleaning was not permanent and could be significantly reduced by a subsequent acidic cleaning step.

• 出版日期2014-6-16