埋立地浸出液中の腐植質の放射線分解

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書誌事項

タイトル別名
  • Radiation Decomposition of Humic Substances in Landfill Disposal Leachate
  • ウメタテチ シンシュツエキチュウ ノ フショクシツ ノ ホウシャセン ブンカイ
  • —TOC reduction and CO<SUB>2</SUB> formation—
  • ―TOCの減少とCO<SUB>2</SUB>の生成―

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説明

The leachate generated from landfill contains humic substances such as humic acid and fluvic acid. It shows, in general, high chemical oxygen demand (COD) and biological oxygen demand (BOD), and colors in dark brown. When the leachate collected on the No. 15 landfill in Tokyo Bay was irradiated by 7-rays from a 60Co source in bubbling air, the total organic carbon (TOG) decreased with increasing dose and the brown color was bleached. The effects of pH, flow rate, and dose rate on the decrease of TOC, the variations of UV spectrum, and the formation of carbon dioxide by the irradiation were examined. The decreasing rate of TOC increased with an increase of the flow rate up to -1l/min and showed a maximum value in the region of pH 4-6. It was also dependent on the dose rate and increased with a decrease of the dose rate. The radiation chemical yield, G (-TOC), reached 162 at low dose rate of 1.3×104 rad/h. This result suggests that a radiation-induced chain reaction occurred. The amount of TOC decreased was almost equal to that of carbon dioxide formed. This result shows that the organic substances were decomposed by irradiation to carbon dioxide as a final product and it was ejected from the solution.

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