Evaluation of UV Disinfection on Inactivation of Indicator Microorganisms and Ecotoxicity after Temporary Wastewater Treatment in Sewage Treatment Plants Damaged by Earthquake and Tsunami Disaster

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  • 被災下水処理場の暫定処理を想定した紫外線消毒による指標微生物の不活化と生態毒性
  • ヒサイ ゲスイ ショリジョウ ノ ザンテイ ショリ オ ソウテイ シタ シガイセン ショウドク ニ ヨル シヒョウ ビセイブツ ノ フカツカ ト セイタイ ドクセイ

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<p>　Ultraviolet (UV) irradiation was evaluated as an alternative disinfection to chlorination after temporary wastewater treatment in sewage treatment plants damaged by earthquake and tsunami disaster. We conducted UV disinfection experiment using a cylindrical UV batch reactor (wave length 254nm, UV lamp electricity consumption 30W) for influent/primary effluent, effluent from contact oxidation process, and effluent from activated sludge process. As a result, UV disinfection was effective for inactivation of bacteria and virus to turbid wastewater. Necessary UV irradiation time for 2-log inactivation of coliphage, total coliforms, E.coli, Enterococcus by UV disinfection, were 400~450 sec, 300~350 sec and 260~290 sec for the effluents from primary treatment, contact oxidation process and activated sludge process, respectively. The result shows that contact oxidation process can decrease UV irradiation time by 25% than primary effluent. In addition, we proposed an estimation method of UV transmittance in turbid wastewater by biodosimetry spiking MS2 phage into the wastewater sample, respectively. Transmittance of the effluent from contact oxidation process was estimated above 59% in average and smaller than that of the influent/primary effluent (below 41% in average). Meanwhile, the toxicity after UV disinfection was tested by Microtox® test, and that was not increased by UV disinfection in the influent/primary effluent or contact oxidation process effluent. </p>

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