Spectrum Comparison of Raw Water Using Three-Dimensional Fluorescence Excitation-Emission Matrix and Control of Disinfection By-Product by the Color of the Filtered Water

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  • KIMURA Takuya
    東京都水道局多摩水道改革推進本部　調整部　技術指導課
  • SASAKI Makoto
    東京都水道局多摩水道改革推進本部　調整部　技術指導課
  • KOYAMA Yuki
    東京都水道局多摩水道改革推進本部　調整部　技術指導課
  • SASAHARA Takashi
    東京都水道局東村山浄水管理事務所　小作浄水場
  • TSUJI Masahito
    東京都水道局多摩水道改革推進本部　調整部　技術指導課
  • YOSHIZAWA Kenichi
    東京都水道局多摩水道改革推進本部　調整部　技術指導課　水質管理担当課長

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  • ３次元分光蛍光光度法による原水スペクトルの比較及び消毒副生成物生成量の色度による管理
  • 3ジゲン ブンコウ ケイコウ コウドホウ ニ ヨル ゲンスイ スペクトル ノ ヒカク オヨビ ショウドク フクセイセイブツ セイセイリョウ ノ シキド ニ ヨル カンリ

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Abstract

There is a risk of Disinfection By-Product (formation exceeding water quality standards due to water pollution caused by rainfall at water treatment plants located in the mountainous areas in Tokyo. Therefore, we studied Humin which creates DBP, in order to control DBP formation. We used Three-Dimensional Fluorescence Excitation-Emission Matrix to study Humin and examined the performance of flocculants for removing Humin. As a result, it became clear that the Humin created in all of the mountainous areas of Tokyo share similar fluorescence properties. It revealed that correlations between the fluorescence intensity, the color and the DBP Formation Potentials (DBP FP) were strong. So we were able to make a formula to calculate DBP FP from the fluorescence intensity or from the color. Thereby, we could control DBP formation by monitoring the color of filtered water. Furthermore, it was thought that here are two factors which have an effect on removing humic acid, one of which is the flocculation of aluminum and the other is the pH decrease. We applied these results to the operating conditions of the water purification plants, and we use the results to control DBP formation.

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