A hybrid biological-adsorption approach for the treatment of contaminated groundwater using immobilized nanoclay-algae mixtures

Sara Mollamohammada, Ashraf Aly Hassan, Mohamed Dahab, Sandeep Kumar

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Mixing the Scenedesmus species with nanoclay and immobilizing in sodium alginate was evaluated as a sustainable treatment method for removing nitrate, atrazine, and metals from groundwater. Gel beads containing the hybrid mixture removed 100% of 10 mg/L N nitrate and 98% of 100 µg/L atrazine from synthetic groundwater in three days. The optimal amount of nanoclay was found to be 0.30 mg per bead. The experimental data fit well into a Freundlich adsorption isotherm and followed pseudo first-order kinetics. When tested in actual groundwater, 91% of nitrate and 100% of Cr, Se, and V were eliminated in three days without need for any nutrients or carbon source. Immobilizing algal beads embedded with nanoclay is a natural, low-cost alternative for groundwater treatment. The gel beads can be reused for at least two cycles without a compromise in performance. They are water-insoluble, easy to harvest, and offer high removal efficiency.

Original languageEnglish
Article number633
JournalWater (Switzerland)
Volume13
Issue number5
DOIs
Publication statusPublished - Mar 1 2021

Keywords

  • Adsorption
  • Atrazine removal
  • Biological treatment
  • Nanoclay
  • Nitrate removal
  • Scenedesmus species

ASJC Scopus subject areas

  • Geography, Planning and Development
  • Biochemistry
  • Aquatic Science
  • Water Science and Technology

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