最終処分場内部保有水質制御のための浸透性反応層 (HPRB) 技術の開発

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タイトル別名
  • Horizontal Permeable Reactive Barrier for Improving the Water Quality within Landfills
  • サイシュウ ショブンジョウ ナイブ ホユウ スイシツ セイギョ ノ タメノ シントウセイ ハンノウソウ HPRB ギジュツ ノ カイハツ

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説明

We have developed a Horizontal Permeable Reactive Barrier (HPRB) system as an alternative intermediate and bottom soil cover in landfill. The HPRB materials were prepared by mixing volcanic ash soil (i.e. Kanto loam) as the base material for capturing toxic chemicals, iron powder discharged from foundries as a reaction accelerator, and waste-melted slag as a permeation regulator. In this study, the HPRB performance was evaluated by using four in situ pilot-scale lysimeters in test cells with diameters of 5m and heights of 7m. Two test cells were filled with waste A - an inorganic waste consisting of incineration ash and crushed incombustible waste. Two other test cells were filled with waste B in which 5% compost was added to the waste A. HPRB layers of 0.5-m thickness were placed at the bottom of each 2.5-m-thick waste layer and slag layers were placed as controls in the same manner.<BR>We evaluated them by designing a 22-type experiment consisting of two-factors (waste and cover soil) and two standards (waste A and waste B, HPRB and slag). 125 chemical items in leachate, including pH, EC, ORP, organic pollutants, inorganic ions, metals (including metalloids), volatile fatty acids and organic compounds (chlorobenzenes, phenols, 1,4-dioxane, PAHs) were monitored over a one-year period. As the result, 60 items were detected in the leachates and, except Ca2+, Mg2+, NO3−, Zn and 1,4-Dichloro-benzene, the main effect of HPRB was confirmed for all the items. This suggests that HPRB can capture and purify large quantities of these substances.

収録刊行物

  • 廃棄物学会論文誌

    廃棄物学会論文誌 19 (3), 197-211, 2008

    一般社団法人 廃棄物資源循環学会

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