NDLI: Defluoridation of Groundwater Using Termite Mound

Content Provider	Springer Nature Link
Author	Fufa, Fekadu Alemayehu, Esayas Lennartz, Bernd
Copyright Year	2013
Abstract	High concentration of fluoride in groundwater is a longstanding health problem. Fluoride adsorption capacity of termite mound (TM), containing mainly silicon, aluminum, iron, and titanium oxides, was investigated under a batch adsorption system. The influence of parameters such as contact time, solution pH, adsorbent dose, initial fluoride concentration, and the presence of competing anions was investigated. Equilibrium was achieved within 10 min of agitation time. A high percentage (~90 %) of fluoride removal was obtained in a wide pH range 3–8, which is important in the practical application. Kinetics data followed the pseudo-second-order model (R $^{2}$ > 0.99). The Dubinin–Radushkevich isotherm described most satisfactorily (R $^{2}$ = 0.968, χ $^{2}$ = 0.09) the equilibrium adsorption, giving a sorption capacity of 2.70 mg/g. The obtained mean free energy (E $_{DR}$ = 11.62 kJ/mol) suggested that chemisorption should be mainly responsible for fluoride adsorption. Fluoride removal was significantly decreased in the presence of carbonate and phosphate ions, whereas slightly increased in the presence of chloride, nitrate, and sulfate. The adsorbent reduced 7.56 mg/L fluoride content of groundwater to below 1.5 mg/L. The fluoride-loaded TM was successfully regenerated using calcined eggshell or NaOH solution with insignificant loss of metals. The adsorption efficiency of the regenerated TM was comparable to the fresh TM. The results obtained from this study could provide important information for evaluating the application of TM for defluoridation.
Starting Page	1
Ending Page	15
Page Count	15
File Format	PDF
ISSN	00496979
Journal	Water, Air, and Soil Pollution
Volume Number	224
Issue Number	5
e-ISSN	15732932
Language	English
Publisher	Springer Netherlands
Publisher Date	2013-04-17
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Calcined eggshell Equilibrium Kinetics Regenerable adsorbent Environment Atmospheric Protection/Air Quality Control/Air Pollution Waste Water Technology Water Pollution Control Water Management Aquatic Pollution Soil Science & Conservation Hydrogeology Climate Change
Content Type	Text
Resource Type	Article
Subject	Ecological Modeling Environmental Chemistry Pollution Environmental Engineering Water Science and Technology

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