Influencing Factors on NOM Removal using Blended Coagulants

혼합응집제에 의한 자연유기물질 제거에 미치는 영향 인자

  • 명복태 (건국대학교 환경공학과) ;
  • 우달식 ((재)한국계면공학연구소 수질환경연구부) ;
  • 최종헌 ((재)한국계면공학연구소 수질환경연구부) ;
  • 문철훈 (건국대학교 환경공학과) ;
  • 이윤진 (건국대학교 환경공학과) ;
  • 조영태 (충청대학 환경·화공학부) ;
  • 조관형 (청운대학교 토목환경공학과) ;
  • 남상호 (건국대학교 환경공학과)
  • Published : 2001.09.01

Abstract

This study was carried out to investigate the major factors for the removal of NOMs (Natural Organic Matters) by alum ferric chloride and blended coagulants that consisted of alum and ferric chloride. Investigated factors were pH, the dosage of coagulant, alkalinity, hardness and bloc strength. The particle size contained in the test water came from the Han River was also measured. DOC(Dissolved Organic Carbon) removal at pH 6 was two to three times higher than at pH 8.5. The blended coagulant showed 9 to 10 percent higher DOC removal efficiency and 2 to 4 percent higher turbidity under the same condition. Alkalinity consumption of alum, ferric chloride and blended coagulant was 81%, 90% and 86% of theoretical value, respectively. The limit concentration of alkalinity to avoid pin floe was 10 mg $CaCO_3/L$ when alum was used. Hardness had no apparent effect on coagulation. The residual turbidity and $UV_{254}$ showed a tendency of increasing with floc strength($sec^{-1}$) increase. The order of floe strength was the following; alum >blended coagulant > ferric chloride. The particle counter test showed 89 percent of the small particle size(SPS, $1~5{\;}{\mu}textrm{m}$) and 11 percent of the medium to large particle size(M.LPS, $5~125{\;}{\mu}textrm{m}$). At PH7.85, the particle removal efficiencies of SPS($1~5{\;}{\mu}textrm{m}$) and M.LPS($5~125{\;}{\mu}textrm{m}$) in the coagulation process were 81% and 95%, respectively.

Keywords

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