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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;Do, Si-Hyun;Kwon, Young-Eun;Hong, Seong-Ho
이용수;도시현;권영은;홍성호

  • Received : 2016.03.31
  • Accepted : 2016.04.14
  • Published : 2016.04.15

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).

Keywords

Potassium permanganate;Manganese;Surface water;Bicarbonate

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Cited by

  1. Multiple injection of permanganate and hypochlorite for manganese removal by oxidation combined with membrane filtration vol.32, pp.3, 2018, https://doi.org/10.11001/jksww.2018.32.3.211

Acknowledgement

Grant : 물관리연구개발사업

Supported by : 국토교통부