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A Mechanism for the Occurrence of Ions in Distilled Water

Balakrishnan, Ramesh and Sankannavar, Ravi and Rao, Kesava K (2011) A Mechanism for the Occurrence of Ions in Distilled Water. In: Industrial & Engineering Chemistry Research, 50 (23). pp. 13202-13209.

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Official URL: http://pubs.acs.org/doi/abs/10.1021/ie2002022


Solar distillation can be used to produce potable water from contaminated water. However, studies show that ions such as F(-) and NO(3)(-) occur in distillates from solar stills. In order to understand the reasons for this behavior, imaging and distillation experiments were conducted. White dots were seen in the vapor space above the interface of hot water poured into containers. The concentrations of various ions such as F(-) and SO(4)(2-) in the distillates from thermal and solar distillation experiments were roughly comparable when the feed consisted of deionized water and also solutions having fluoride concentrations of 100 and 10 000 mg/L. These observations suggest that aerosols enter the distillation setup through leaks and provide nuclei for the condensation of water vapor. The water-soluble component of aerosols dissolves in the drops formed, and some of the drops are transferred to the distillate by buoyancy-driven convection.

Item Type: Journal Article
Publication: Industrial & Engineering Chemistry Research
Publisher: American Chemical Society
Additional Information: Copyright of this article belongs to American Chemical Society.
Department/Centre: Division of Mechanical Sciences > Chemical Engineering
Date Deposited: 03 Jan 2012 12:11
Last Modified: 03 Jan 2012 12:11
URI: http://eprints.iisc.ac.in/id/eprint/42962

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