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The Removal of Algae by Pre-oxidation

전산화 공정을 이용한 조류제거

  • Son, Hee-Jong (Water Quality Institute, Waterauthority) ;
  • Jung, Chul-Woo (Ulsan Regional Innovation Agency, Uisan Industry Promotion Techno Park) ;
  • Bae, Sang-Dae (Department of Environmental Engineering, Silla University) ;
  • Choi, Young-Ik (Department of Environmental Engineering, Silla University) ;
  • Kang, Lim-Seok (Department of Environmental Engineering, Pukyung National University)
  • 손희종 (부산광역시 상수도사업본부 수질연구소) ;
  • 정철우 (울산산업진흥TP 전략산업기획단) ;
  • 배상대 (신라대학교 환경공학과) ;
  • 최영익 (신라대학교 환경공학과) ;
  • 강임석 (부경대학교 환경공학과)
  • Published : 2009.03.31

Abstract

The blue-green algae which caused odor problem in the tap water are difficult to precipitate in sedimentation basin and clogged the filter void rapidly. The studies of this paper were not only oxidation, coagulation and sedimentation processes for effectively removing blue-green algae but yellow clay and polyamine for verification as coagulants aids. The results of this research are summarized as follows: Higher ozone dose(C) and longer contact time(T) were needed for a high degree of removing blue-green algae efficiency. the removal rate of blue-green algae was proportional to the $C\times T$ value. The removal percent of chlorophyll-a by sedimentation and filter without pre-ozonation was about 75% but 1 mg/L pre-ozonation could increase the removal percent of chlorophyll-a to 99% and more pre-ozonation could remove completely. Though the removal efficiency of turbidity could increased by high dose of chlorination, the dissolved organic carbon was increased. More chlorine dose from 4 to 10 mg/L dissolved organic carbon was decreased. Using yellow clay as coagulant aids increased density of floc so the settling velocity of floc become rising but polyamine could not increase settling velocity of floc though it could formated large floc.

Keywords

Algae removal;Microcystis sp.;Pre-oxidation;Microcystin;Coagulation;Filtration

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