Removal of fluoride and aluminium using plant-based coagulants wrapped with fibrous thin film

Winston Lik Khai Lim*, Edwin Chin Yau Chung, Chien Hwa Chong, Nicholas Tze Kai Ong, Wee Seong Hew, Nurasatifah binti Kahar, Zhen Jie Goh

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


The coagulation activity of Moringa oleifera seed and Hibiscus esculentus (okra) mucilage were assessed for their ability to remove both anionic and cationic contaminants in aluminium sulphate and hydrofluoric acid synthetic wastewater. The effect of encasing these coagulants in a fibrous thin film along with their effect on pH and concentration were also assessed. Assessment using the jar test showed a 79.9% aluminium reduction and 91.7% fluoride reduction using okra mucilage and Moringa oleifera, respectively. Besides that, there was no effect on both the pH and coagulation activity in the application of fibrous thin film. The plant-based coagulation activity is comparable with conventional coagulant as fluoride removal treated by polyaluminium chloride formulation was 85.3 ± 0.8% with the optimum dosage of 3 g/L. The significance of these findings in the application of fibrous thin film with plant-based coagulants could be an advantage for industries to commercialise mechanically prepared coagulants, which has a much longer shelf life as compared to chemically prepared coagulants, as it has the potential to reduce the turbidity associated with mechanically prepared coagulants. Also, these results indicate the possibility of having a cost-effective yet environmentally friendly water treatment solution that combines the application of both plant-based and conventional coagulants.

Original languageEnglish
Pages (from-to)704-710
Number of pages7
JournalProcess Safety and Environmental Protection
Early online date21 Jun 2018
Publication statusPublished - Jul 2018


  • Aluminium
  • Fibrous thin film
  • Fluoride
  • Hibiscus esculentus
  • Moringa oleifera
  • Wastewater treatment

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Safety, Risk, Reliability and Quality


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