Nature Environment and Pollution Technology

Open Access Open Access  Restricted Access Subscription Access

Water Defluoridation by Lignite


Affiliations
1 Army Headquarters, Kashmir House, New Delhi-110 011, India
2 Civil Engineering Department, Universiti Teknologi PETRONAS, Bandar Seri Iskandar-31750, Tronoh, Perak, Malaysia
 

Lignite (raw or alum-treated) was found to possess about one-half the fluoride sorption capacity of commercial grade activated alumina. No significant difference in performance of raw and alum-treated lignite in five cycles of defluoridation column test at pH 5.0 ± 0.2, using hydrochloric acid as regenerant, was observed. Infrared spectra indicated interaction of fluoride with carbonyl and aromatic ring functional groups in lignite. The results call for long-duration column tests, employing fluoride-bearing groundwater of varied characteristics and at natural pH, to confirm suitability of lignite as a low-cost medium for home water defluoridation in rural areas of developing countries.
User
Notifications
Font Size


Abstract Views: 153

PDF Views: 1




  • Water Defluoridation by Lignite

Abstract Views: 153  |  PDF Views: 1

Authors

S. K. Kohli
Army Headquarters, Kashmir House, New Delhi-110 011, India
Malay Chaudhuri
Civil Engineering Department, Universiti Teknologi PETRONAS, Bandar Seri Iskandar-31750, Tronoh, Perak, Malaysia

Abstract


Lignite (raw or alum-treated) was found to possess about one-half the fluoride sorption capacity of commercial grade activated alumina. No significant difference in performance of raw and alum-treated lignite in five cycles of defluoridation column test at pH 5.0 ± 0.2, using hydrochloric acid as regenerant, was observed. Infrared spectra indicated interaction of fluoride with carbonyl and aromatic ring functional groups in lignite. The results call for long-duration column tests, employing fluoride-bearing groundwater of varied characteristics and at natural pH, to confirm suitability of lignite as a low-cost medium for home water defluoridation in rural areas of developing countries.