Long-term Evaluation of Phosphorus Removal Purification Performance and Adsorption Property of <I>Akadama</I> Soil Used in Soil Percolation Treatment

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  • WADA Keiko
    Institute of Lake Biwa-Yodo River Water Purification Research, Lake Biwa-Yodo River Water Quality Preservation Organization
  • KISHIMOTO Naoyuki
    Department of Environmental Solution Technology, Faculty of Science and Technology, Ryukoku University
  • SOMIYA Isao
    Institute of Lake Biwa-Yodo River Water Purification Research, Lake Biwa-Yodo River Water Quality Preservation Organization
  • SATO Toshihiko
    Teijin Eco Science Co. LTD.
  • TSUNO Hiroshi
    Institute of Lake Biwa-Yodo River Water Purification Research, Lake Biwa-Yodo River Water Quality Preservation Organization Department of Human Life & Environment, Faculty of Human Environment, Osaka Sangyo University

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Other Title
  • 土壌浸透処理による赤玉土のリン除去性能および吸着特性の長期カラム実証評価
  • ドジョウ シントウ ショリ ニ ヨル セキギョクド ノ リン ジョキョ セイノウ オヨビ キュウチャク トクセイ ノ チョウキ カラム ジッショウ ヒョウカ
  • Long-term Evaluation of Phosphorus Removal Purification Performance and Adsorption Property of Akadama Soil Used in Soil Percolation Treatment

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Soil percolation experiments using aggregated soil of volcanic ash (Akadama) were demonstrated for phosphorus removal from water streams, in which the phosphate removal performance of soil columns and the adsorption capacity of Akadama soil were evaluated through short-term and long-term operations over seven years. The result showed that the removal performance strongly depended on both the empty bed contact time and the thickness of the soil layer. The adsorption capacity test revealed that the cumulative phosphorus adsorption mass was in the range of 0.5-1.5 gP•kg-1, when the phosphate concentration in the effluent began to increase rapidly. A value equivalent to 10% of the phosphate adsorption coefficient was regarded to be the purification capacity of the soil and was suggested to be an effective index for evaluating the lifetime of Akadama soil in facility planning. The regression line obtained from the relationship between effluent phosphorus concentration and cumulative phosphorus adsorption mass may be applicable to the estimation of phosphorus adsorption mass from the observed phosphorus concentration in the effluent. Moreover, cumulative phosphorus adsorption mass could be estimated from water-quality monitoring data, because the cumulative phosphorus removal mass calculated from water-quality monitoring data was in accord with the cumulative phosphorus adsorption mass to some extent.

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