DEFLUORIDATION OF WATER WITH ENVIRONMENTAL WASTE MATERIALS

Environmental waste materials like egg shell and ground nut shell were made into powder and made to interact with the fluorinated water. These are in fact used as adsorbents for the removal of Fluoride (F- ) present in the water. The removal efficiency of Fluoride is tested by in two ways; one by increasing the concentration of adsorbent (dosage) and other by increasing the contact time. For Egg shell powder the dosages of the adsorbents are taken 1gm, 3gm, 5gm and 10gm, and for ground nut shell powder the dosages are taken in 3gm, 5gm, 10gm and 20 gm. The contact time of adsorbent with water has taken differently for Egg shell powder (30 min, 60 min, 90 min, 120 min and 180 min) and ground nut shell powder (1hr, 3hr, 6hr, 12hr and 24hr). The observed results indicate that the groundnut shell powder has maximum removal in both the cases out of two defluoridation agents. The removal efficiency of Groundnut shell powder has increased with increase in contact time (ie. For 24 hrs76.9 %) and dosage (20 gms- 81.65%). The egg shell powder also exhibited the similar trend as that of Ground nut Shell powder.