REMOVAL OF MANGANESE FROM WATER USING CRUSHED DOLOMITE FILTRATION TECHNIQUE

This paper discusses manganese removal from water by filtration throug h low cost coarse media. A laboratory scale filtration technique was u sed to remove manganese from manganese bearing water to prove previous batch studies which showed that the removal of manganese was better i n the case of limestone particle as compared to the gravel, crushed br ick or with no media addition, and the conclusion made that removal me chanisms were due to the effect of rough solid surfaces and the presen ce of carbonate in the limestone particle. Filtration results indicate d that at an input pH of 7 with manganese concentration of 1 Mn/l, a g ood removal was observed in the limestone media as compared to the gra vel media, which validates the batch results. Results also show that w ater hardness did not significantly increase in this filtration techni que. Studies on the effect of different parameters on the removal perf ormance of manganese has shown that a smaller particle size, a greater filter depth, and a lower flow rate gave advantages in the removal ef ficiency.