Activated carbon-limestone-alginate (ALA) beads for the removal of colour and turbidity from kerian river water
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Date
2019-06
Authors
Nur Athirah Binti Rosli
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Abstract
This study focused on the usage of activated carbon (AC), limestone (LS) and alginates
in treating the Kerian river water. Therefore, the best mix ratio (AC: LS) 3:7 has been
adapted based on the previous study to produced composite adsorbent for removal of
colour and turbidity and followed by regeneration of the used composite adsorbent.
Factor of adsorbent dosage, contact time and shaking speed were considered for
optimization processes to get maximum value for the removal of colour and turbidity of
the river water. As a result, the composite adsorbent manages to remove 94.15% colour
and 90.92% turbidity by using optimum adsorbent dosage settings of 23.14 g, shaking
speed of 114rpm and contact time of 71min. Kinetic and isotherm adsorption model for
composite adsorbent were also determined. The result shows that the maximum
adsorption capacity of one layer composite adsorbent for colour and turbidity are 17.857
PtCo/g and 8.078 NTU/g, respectively. Meanwhile, the kinetic adsorption model
describes the suitability of the use of pseudo-second order. Freundlich isotherm is
suitable for equilibrium adsorption data. Regeneration of adsorbent is done by solvent
wash method by using methanol but unfortunately the removal of colour and turbidity of
river water was not successful which it brings negative value.