The application of metakaolin based geopolymer in adsorption study for iron, manganese and colour removal from groundwater
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Date
2019-06
Authors
Mohamad Hafizie Bin Mat Rowi
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Abstract
The objective of this research is to investigate the potential of geopolymer based
metakaolin as adsorbent in removing heavy metals and colour in groundwater from
tube well in School of Civil Engineering, Universiti Sains Malaysia. The concentration
of iron, manganese and colour from groundwater sample exceed the permissible limit
stated by Ministry of Health for drinking water standard. Based on previous research,
common adsorbent used in groundwater treatment are zeolite, limestone and activated
carbon. However, literature review also show the potential of geopolymer based
metakaolin as adsorbent in water treatment. The main objective of this research was
the ability geopolymer based metakaolin in removing heavy metals and colour from
groundwater. In this research, three samples of geopolymer was prepared with
different solid to liquid ratio which were 0.4, 0.6 and 0.8. The best mix design ratio
chooses was solid to liquid ratio 0.8 based on ability to maintain their structure when
exposed to water. The best geopolymer sample selected was used as adsorbent in
adsorption batch study. Batch study conducted based of effect of dosage, shaking
speed and contact time. The percentage removal recorded was 100% for iron and
manganese at optimum dosage, shaking speed and contact time which were 2g/ mL,
125 rpm and 1 hour. The highest removal of colour recorded was 68.75% in dosage
study. In the equilibrium data analysis, Langmuir isotherm model found to fit the
adsorption in this study better than Freundlich isotherm. Based on the removal rate
established in the study, geopolymer based metakaolin is a potential adsorbent in the
removal of heavy metals, specifically for iron and manganese as well as colour in
groundwater.