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Defluoridation of reject water from a reverse osmosis unit and synthetic water using adsorption

Samrat, Maruvada V V Naga and Rao, K Kesava and SenGupta, Arup K and Riotte, Jean and Mudakavi, J R (2018) Defluoridation of reject water from a reverse osmosis unit and synthetic water using adsorption. In: JOURNAL OF WATER PROCESS ENGINEERING, 23 . pp. 327-337.

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Official URL: https://dx.doi.org/10.1016/j.jwpe.2017.07.015

Abstract

Many parts of the world have excess fluoride in drinking water. At some locations, nitrate is also in excess. Hence, reverse osmosis (RO) units have been installed M several villages in India. Reverse osmosis is a good technique, but it has the disadvantage of discarding a considerable amount of the inlet water as a reject stream. This is an unsustainable way of using water. Two adsorbents, namely, a hybrid anion exchange resin embedded with zirconium oxide nanoparticles (HAIX-Zr), and activated alumina (AA) were used in column experiments. For water containing only F-, HAIX-Zr had a better capacity than AA. The same trend was observed with synthetic water samples containing other ions in addition to F-.(-) However, for RO reject, the converse was true, and the capacities of AA and HAIX-Zr decreased significantly. For AA, the presence of a small concentration of HCO3- increased the uptake of F- by 100% compared to water containing only F-. For HAIX-Zr, the adsorption capacity decreased as the concentration of co-ions increased. The cost of treated water varied from (sic) 0.1-1.5/L (US $ 0.002-0.03/L) for AA and (sic) 0.2-11.5/L (US $ 0.004-0.23/L) for HAIX-Zr.

Item Type: Journal Article
Additional Information: Copyright of this article belong to ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Department/Centre: Division of Mechanical Sciences > Chemical Engineering
Depositing User: Id for Latest eprints
Date Deposited: 10 Aug 2018 16:07
Last Modified: 16 Oct 2018 09:04
URI: http://eprints.iisc.ac.in/id/eprint/60409

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