Studies have been carried out on defluoridation of ground water using gamma alumina coatings on a ceramic honeycomb. The sol gel coated gamma alumina adsorbent was found to adsorb fluoride rapidly and effectively. Coatings on ceramic honeycomb were prepared using a sol of dispersible precursor of boehmite (γ-AlOOH). The boehmite coating, on calcination at 500°C transformed to γ-alumina. The fluoride removal performance was investigated as a function of the fluoride concentration and flow rate. It was observed that fluoride removal is low at higher flow rate. The specific fluoride uptake capacity was 15400mg of F− removed /kg of coated γ-alumina on the ceramic honeycomb from de-ionized water, whereas in case of ground water, the capacity was 11080 mg of F− per kg of coated alumina. The regeneration was effected by passing a dilute solution of aluminum sulfate solution. A fluoride removal kit consisting of five ceramic honeycombs in series was evaluated to defluoridate ground water. Around 200 liters of ground water (initial F− conc. of 5 ppm) could be defluoridated to permissible level of F− concentration. It is much easier and convenient to regenerate the alumina coated on the honeycombs due to open channel structures of the honeycomb.
Fluoride Removal from Ground Water by γ-Alumina Coated Ceramic Honeycomb
K. Dash, U. S. Hareesh, R. Johnson, J. Arunachalam; Fluoride Removal from Ground Water by γ-Alumina Coated Ceramic Honeycomb. Water Practice and Technology 1 September 2010; 5 (3): wpt2010061. doi: https://doi.org/10.2166/wpt.2010.061
Download citation file: