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Total Coliform Removal Efficiency in Slow Sand Filter
(Pulchowk Campus, 2016-04) Adhikari, Arjun
Slow sand filtration is an ideal technology for developing country’s drinking water treatment options. Slow sand filter is a simple option to remove the microorganisms as well as turbidity and the study was to demonstrate the total coliform removal efficiency in slow sand filter using coarse sand. This research work was carried out by developing a 0.22 m*0.22 m*2.75 m fiber glass filter model and set up at Institute of Engineering. During the study different parameters like total coliform, turbidity, pH, temperature, discharge and head loss developed on the filter were analyzed in three cycles of filter run. Total coliform removal efficiency varied from 35.9% to 100% .Total coliform removal efficiency was dependent with Hydraulic loading rate as the efficiencies were 99.58%, 97.34%, 95.45%, 90.32%, and 89.81% for HLR <0.1m/hr., HLR 0.1 m/hr. – 0.2 m/hr., HLR 0.2 m/hr. – 0.3 m/hr., HLR 0.3 m/hr. – 0.4 m/hr., and HLR >0.4 m/hr. respectively. With proper operation of slow sand filter upto influent turbidity of 50 NTU, water becomes drinkable with effluent water turbidity below 5 NTU, total coliform removal upto 100% and pH also within the limit of National Drinking Water Quality Standards, 2005.