Two high capacity, high flow rate defluoridation filters with 10 and 25kg Activated Alumina have been fabricated and tested with local fluoride contaminated ground water. Various water quality parameters like pH, TDS, F-, Cl-, SO42-, NO3-, Ca2+ Hardness, Mg2+ Hardness, Total Hardness have been monitored throughout the filtration process and it has been found that these values are within the permissible limits. The filter performance has been evaluated by determining the volume of safe water (1.5 ppm), fluoride uptake capacity, flow rate, empty bed contact time, water capacity of filter, time before first regeneration, capital and recurring cost of filter. On basis of detailed discussion on these parameters the filter with 10 kg AA is considered to be a better filter as compared to the one with 25 kg AA
Read full abstract