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Multiple injection of permanganate and hypochlorite for manganese removal by oxidation combined with membrane filtration

산화-막여과에 의한 망간 제거 시 과망간산과 차아염소산 복합 주입의 효과

  • Kwak, Hyoeun (Department of Environmental Engineering, Yonsei University) ;
  • Park, Jeongwon (Department of Environmental Engineering, Yonsei University) ;
  • Min, Sojin (Department of Environmental Engineering, Yonsei University) ;
  • Lim, Joowan (Department of Environmental Engineering, Yonsei University) ;
  • Kim, Keehong (Department of Environmental Engineering, Yonsei University) ;
  • Lee, Hosung (Department of Environmental Engineering, Yonsei University) ;
  • Nahm, Chang-Hyun (Department of Environmental Engineering, Yonsei University) ;
  • Park, Yong-Min (Coway Co., Ltd.) ;
  • Park, Pyung-Kyu (Department of Environmental Engineering, Yonsei University)
  • Received : 2018.02.12
  • Accepted : 2018.04.02
  • Published : 2018.06.15

Abstract

The water containing soluble manganese may cause problems such as discolored water, unpleasant taste, fouling or scaling of pipes in water distribution system, and so on. Conventional water treatment processes using sand filtration or sedimentation after oxidation, however, cannot often meet manganese standard for drinking water. Two types of oxidants, potassium permanganate ($KMnO_4$) and sodium hypochlorite (NaOCl), were utilized at the same time for manganese oxidation, and then the precipitated manganese oxides were removed by low pressure membrane filtration in this study. In batch experiments, the multiple injection of both oxidants showed more effective manganese removal than did the single injection using either of them. Moreover, the deterioration of manganese removal at low temperature was less serious for the multiple injection than that for the single injection. Manganese removal by the continuous system of oxidation by multiple injection combined with membrane filtration was higher than those by batch experiments at the same oxidation conditions. In addition, less membrane fouling was observed for membrane filtration with oxidation during continuous membrane filtration than membrane filtration without oxidation. These results indicate that the oxidation by multiple injection coupled with membrane filtration was efficient and applicable to actual water treatment for manganese removal.

Keywords

References

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