Add time:08/04/2019         Source:sciencedirect.com

This study developed improved manganese oxide coated media based on the todorokite structure which are an effective means to remove a range of heavy metal ions from acid mine drainage (AMD) solutions. As a consequence, limitations of conventional acid mine drainage treatment wherein use of oxidants is required, substantial quantities of alkali are used and sorbents which exhibit stability issues when Fe(II) is co-present in the water, are mitigated. This study investigated three synthetic MnO2 phases: pyrolusite, cryptomelane and todorokite with a specific focus on identifying a preferred MnO2 phase for Mn(II) removal from AMD wastewaters. Pyrolusite was found to have low capacity for Mn(II) removal and was sensitive to reductive dissolution by Fe(II). Cryptomelane, similarly showed relatively small capacity for Mn(II), and also impacted by reductive dissolution. Todorokite was discovered to exhibit significant capacity for Mn(II) (75–80 mg/g) in the pH range 5.5–7; a value which increased to 130 mg/g when a lower Mn:Mg ratio todorokite material was used. The todorokite materials studied also showed resistance to reductive dissolution and a marked selectivity for Mn(II), along with further capacity for Cr(III), Cu(II), Co(II), Ni(II) and Zn(II) removal when treating simulated discharge AMD and lime-dosed AMD.

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