The treatment of acid mine drainage (AMD) using a combination of selective precipitation and bio-sorption techniques: A hybrid and stepwise approach for AMD valorization and environmental pollution control

Year 2024, Volume: 7 Issue: 3, 313 - 334, 30.09.2024

Nguegang Beauclair , Abayneh Ambushe

https://doi.org/10.35208/ert.1405067

Abstract

In this study, selective precipitation using magnesium oxide (MgO) and bio-sorption with banana peels (BPs) were explored for the treatment and valorization of acid mine drainage (AMD). The treatment chain comprised two distinct stages of which selective precipitation of chemical species using MgO (step1) and polishing of pre-treated AMD using BPs (step 2). In stage 1, 2.0 L of AMD from coal mine were used for selective precipitation and recovery of chemical species using MgO. The results revealed that chemical species of concern were precipitated and recovered at different pH gradients with Fe(III) precipitated at pH ≤ 4, Al at pH ≥ 4-5, Fe(II), Mn and Zn at pH ≥ 8 while Ca and SO42─ were precipitated throughout the pH range. In stage 2, the pre-treated AMD water was polished using BPs. The results revealed an overall increase of pH from 1.7 to 10, and substantial removal of chemical species in the following removal efficiency: Al, Cu and Zn (100% each), ≥ Fe and Mn (99.99% each), ≥ Ni (99.93%), and ≥ SO42─ (90%). The chemical treatment step removed pollutants partially, whereas the bio-sorption step acted as a polishing stage by removing residual pollutants.

Keywords

Acid mine drainage, banana peels, bio-sorption, environmental pollution control, magnesium oxide (MgO) selective precipitation

Ethical Statement

The project is supported by the Water Research Commission (WRC) of South Africa, Project Number C2022/2023-00933.

Supporting Institution

Water Research Commission (WRC)

Project Number

C2022/2023-00933

Thanks

The authors would like to acknowledge the Faculty of Science, University of Johannesburg for postdoctoral scholarship for NB. We acknowledge the University of Johannesburg Research Centre for Synthesis and Catalysis and Spectrum for the facility.

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