Removal of iron and manganese from pre ozonated groundwater using limestone filter
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Date
2017-06
Authors
Shahanis Nabila Binti Mohd Shakri
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Abstract
This research focuses on limestone filter performance in the removal of iron and
manganese from a prepared pre-ozonated sample pre-prepared from the previous study.
It aims to replace anthracite filter currently in use at the treatment plant. The sample was
taken from groundwater tube well in USM Engineering Campus, resembling the tubewell
at the Pintu Geng Water Treatment Plant, Kota Bharu, Kelantan. The pre-ozonated
sample was prepared by adjusting the groundwater from USM tubewell to pH 8 with iron
and manganese concentrations within range 0.3mg/L to 0.5mg/L, respectively. The
limestone was first analysed for the CaCO3 content using X-ray fluorescence method. A
column study was used in this study using limestone particles with size 1.18-2.00 mm.
The XRF results showed that the limestone used contained 85% CaCO3. Comparison on
water quality indicated that there no obvious difference was observed between the water
quality at Pintu Geng Water Treatment Plant and USM groundwater tube well. 7 days
column study via filtration treatment indicates that the best performance of iron and
manganese removals were 83% and 90%, respectively. Column study also shows that
manganese took 660 minutes to achieve breakthrough time (Ct/Co= 0.1) but not for iron.
Limestone as low-cost media filter is proposed to replace anthracite used at Pintu Geng
Water Treatment Plant. Both iron and manganese residual complied with the National
Drinking Water Standard.