Efficacy of polyethylene Interpolymer membranes for fluoride and arsenic ion removal during desalination of water via electrodialysis
2016
Bhadja, Vaibhavee | Trivedi, Jaladhi S. | Chatterjee, Uma
Herein, we report the comparative fluoride and arsenic ion removal efficacies of three different pairs of ion exchange membranes viz. indigenously developed polyethylene Interpolymer based ion-exchange membranes, commercial Ionsep and Fujifilm type I membranes during desalination via the electrodialysis process. Different experiments were conducted in a domestic electrodialysis unit (effective membrane area of 20 cm × 10 cm) using 30 pairs of each type of membrane pair. Both the Interpolymer and commercial Fujifilm type I membranes could effectively reduce the fluoride concentration (14.4 ppm) present in ground water of Rajasthan, India to a drinking water permissible limit (<1.5 ppm). The commercial Ionsep membrane could not reduce such a high concentration of fluoride ion to a permissible limit of drinking water. This is attributed to the moderate water uptake and high fluoride ion transport number of the Interpolymer and commercial Fujifilm type I membranes compared to that of the Ionsep membrane. All three different types of ion-exchange membranes could effectively reduce arsenate ion concentrations of 800 ppb (the maximum concentration present in Indian water) to a permissible limit for drinking water (∼10 ppb). The ion removal efficacy of the membranes depends on the concentration of both the fluoride and arsenate ions present in salt water.
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