Iron removal by intermittent sand flitration / Azlan Mohamad Saad

Iron is present in many ground water. According to the standards in various countries the amount of iron should not exceed 0.3mg/L in water for public supply. Too much iron in the water tends to stain laundry and also gives bad taste to the water etc. Iron is generally removed from water by precipitation through oxidation and filtration. Using sand as a filter media, four filters of varying depth have been designed and constructed. The dosages were intermittently applied. This study was carried out to evaluate the effect of depth on the performance and potential of intermittent sand filtration for iron removal. A series or test was carried out on water of high iron concentration level. Based on the percentage of removal, the effect of dosing time and depth will be analysed and compared with other methods using coal ash as a filter media. It was found, dosing time of 9 hours with an interval of 2 days each, gave better performance compared with the 6 and 3 hours dosing time.