Journal of Korean Society of Water and Wastewater (상하수도학회지)

The Korean Society of Water and Wastewater (대한상하수도학회)
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Manganese removal by KMnO4: Effects of bicarbonate and the optimum conditions

과망간산칼륨을 이용한 용해성 망간 제거: 중탄산염 영향 및 최적조건

  • Lee, Yong-Soo (Department of Chemical engineering, Soongsil University) ;
  • Do, Si-Hyun (Department of Chemical engineering, Soongsil University) ;
  • Kwon, Young-Eun (Department of Chemical engineering, Soongsil University) ;
  • Hong, Seong-Ho (Department of Chemical engineering, Soongsil University)
  • Received : 2016.03.31
  • Accepted : 2016.04.14
  • Published : 2016.04.15
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Abstract

This study is focused on manganese (Mn(II)) removal by potassium permanganate ($KMnO_4$) in surface water. The effects of bicarbonate on Mn(II) indicated that bicarbonate could remove Mn(II), but it was not effectively. When 0.5 mg/L of Mn(II) was dissolved in tap water, the addition of $KMnO_4$ as much as $KMnO_4$ to Mn(II) ratio is 0.67 satisfied the drinking water regulation for Mn (i.e. 0.05 mg/L), and the main mechanism was oxidation. On the other hand, when the same Mn(II) concentration was dissolved in surface water, the addition of $KMnO_4$, which was the molar ratio of $KMnO_4/Mn(II)$ ranged 0.67 to 0.84 was needed for the regulation satisfaction, and the dominant mechanisms were both oxidation and adsorption. Unlike Mn(II) in tap water, the increasing the reaction time increased Mn(II) removal when $KMnO_4$ was overdosed. Finally, the optimum conditions for the removals of 0.5 - 2.0 mg/L Mn(II) in surface water were both $KMnO_4$ to Mn(II) ratio is 0.67 - 0.84 and the reaction time of 15 min. This indicated that the addition of $KMnO_4$ was the one of convenient and effective methods to remove Mn(II).

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