Manganese removal in groundwater treatment using high grade limestone
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Date
2018-05
Authors
Ainul Afeeqah Athirah Abdul Rahim
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Abstract
Manganese is one of difficult elements to remove in groundwater due to its high solubility in
both acid and neutral condition. However, limestone is effective in removing Manganese if
the Manganese is in low concentration. This study investigate the groundwater treatment
using high purity limestone in removing Manganese. In this research, the characterization of
limestone sample obtained from Ipoh was done. The limestone sample contain CaCO3 in
majority at 97.3%. Groundwater sample obtained from USM’s Engineering Campus also
characterized and the concentration of Manganese is approximately 0.5 ppm exceeding the
Raw Water Quality Standard at 0.1 ppm. Filtration of groundwater using pebble size
limestone and sand size limestone column filter was done with different flowrate. For pebble
size limestone column filter, the highest percentage removal is 58.15% where the flowrate is
0.007 L/s. On the other hand, for sand size limestone column filter, the highest percentage
removal is 97.26% where the flowrate is 0.017 L/s. Fine size limestone particle shows an
efficient Manganese removal in groundwater compared to coarser size particle. This was
most probably due to the high surface area of smaller particle. The flow rate did not shows
any significant trend in removing Manganese.