Behavior of Radioactive Cesium in Wastewater Treatment Plants and Dissolution Test of Contaminated Sewage Sludge

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  • TSUSHIMA Ikuo
    National Institute for Land and Infrastructure Management. Ministry of Land, Infrastructure, Transport and Tourism
  • OGOSHI Masashi
    National Institute for Land and Infrastructure Management. Ministry of Land, Infrastructure, Transport and Tourism
  • YAMASHITA Hiromasa
    National Institute for Land and Infrastructure Management. Ministry of Land, Infrastructure, Transport and Tourism
  • HARADA Ichiro
    National Institute for Land and Infrastructure Management. Ministry of Land, Infrastructure, Transport and Tourism

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  • 下水処理場における放射性セシウムの挙動調査および溶出試験
  • ゲスイ ショリジョウ ニ オケル ホウシャセイ セシウム ノ キョドウ チョウサ オヨビ ヨウシュツシケン

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Abstract

The radioactive fallout emitted by the Fukushima Dai-ichi nuclear power plant has flowed into and accumulated in many wastewater treatment plants (WWTPs) of eastern Japan via sewer systems. The behavior of radioactive materials in four WWTPs in the Tohoku and Kanto regions was investigated to determine the mechanism by which sludge is concentrated during water and sludge treatment processes. In addition, dissolution tests were conducted using contaminated incinerated ash and melted slag derived from sewage sludge to better understand the landfill disposal of contaminated sewage sludge. Results indicate that a large amount of radioactive cesium accumulates in aeration tanks with activated sludge and becomes trapped in concentrated sludge during sludge condensation. Results indicate that the radioactivity of the eluate from 9 out of 12 samples was undetectable; for the remaining 3 samples, the dissolution rates were 0.5-2.7%.

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