Removal Of Inorganic Contaminants from Surface And Groundwater By Using NF/RO Filtration System
Journal Title: International Journal of engineering Research and Applications - Year 2018, Vol 8, Issue 10
Abstract
A comprehensive study was conducted to examine the removal of inorganic contaminantswhich exist in surface and groundwater in the Illawarra and Sydney regions. The ability of nanofiltration (NF) and reverse osmosis (RO) systems was investigated using two commercially available NF/RO membranes. Laboratory-scale tests used a cross-flow cell; tests were conducted with 10 ubiquitous solutions that represent the significant inorganic cations and anions commonly found in contaminated surface water. This study concluded that the removal efficiency of RO was better than NF in rejecting the inorganic contaminants detected in surface water.This study revealed that theperformance of the NF and RO membranes in rejecting divalent ions was higher than that for monovalent ion rejection and this can be attributed to multivalent ions with large hydrated radii (e.g. Mg2+and SO4 2- ) being retained more than monovalent ions with smaller hydrated radii (e.g. K+ and Na+ ). The removal efficiency of the NF membrane ranged from 85.9 to 98.3 % for cations, compared with anions, which showed a lower rejection ranging from 71.4 to 99 %. In contrast, the removal efficiency of the RO membrane ranged from 94.1 to 98.4 % for cations while anion rejection ranged from 89.5 to 99.7 %.
Authors and Affiliations
Hamad N. Altalyan, Brian Jones, John Bradd
Keywords
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