Effect of Light Intensity on Inactivation of Microorganism in Solution Discharged from Soaking Germination Process by a Laminated Photocatalyst

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  • Sugawara Yasushi
    Industrial Technology Development Group, Akita Prefectural Research and Development Center
  • Sugawara Katsuyasu
    Department of Applied Chemistry for Environments, Faculty of Engineering and Resource Science, Akita University
  • Sugawara Takuo
    Department of Applied Chemistry for Environments, Faculty of Engineering and Resource Science, Akita University

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  • 浸漬発芽工程排液に含まれる微生物の薄層光触媒による不活性化に及ぼす光強度の影響
  • シンシ ハツガ コウテイハイエキ ニ フクマレル ビセイブツ ノ ハクソウ ヒカリ ショクバイ ニ ヨル フカッセイカ ニ オヨボス ヒカリ キョウド ノ エイキョウ

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Abstract

Effect of light intensity was kinetically investigated on the catalytic inactivation of aerobic bacteria, with a laminated photocatalyst prepared by drying a commercial titanium-dioxide emulsion on the stainless-steel plate, in the solution discharged and filtered with diatomite filter-aids from a soaking process of brown rice germination under the blacklight-lamp irradiation.<br>The inactivation under 352 nm light irradiation was enhanced with shorter induction periods as the number of lamps increased.<br>In terms of effective light intensity Ieff and microorganism concentration C which could control the process, the inactivation rate was successfully represented by the following equation with a shorter induction period,<br>-dC/dt=k·Ieff·C<br>where Ieff was defined the light intensity effective to the inactivation of microorganism through active species produced on the photocatalyst surface under illuminated light intensity I. The absolute value of Ieff was considered a function of radiant light intensity I0 (r2), solution thickness l, and light absorptivity of solution μ; the reference value was selected to be the illuminated light intensity I calculated with a set of minimum values of r2 and l: r2=2.5×10−3 m, l=1.0×10−3 m under the defined number of lamps.<br>With increasing the radiant light intensity I0, the absolute value of effective light intensity Ieff got larger and the ratio of effective light intensity to illuminated light intensity Ieff/I was nearly the same.

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