浸出水処理施設におけるダイオキシン類の挙動  [in Japanese] Behavior of Dioxins in Treatment Processes for Landfill Leachates  [in Japanese]

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Abstract

浸出水処理施設におけるダイオキシン類の挙動の解明を目的に, 処理工程の異なる4施設において各処理工程ごとのダイオキシン類の濃度を調べ, 処理工程ごとのダイオキシン類の除去特性および一般水質項目とダイオキシン類濃度との関係について考察した。<BR>原水のダイオキシン類濃度190pg/L~8, 500pg/L (2.0pg-TEQ/L~130pg-TEQ/L) に対して, 処理水の濃度は5pg/L~120pg/L (0.0067pg-TEQ/L~1.1pg-TEQ/L) となり, 96.6%~99.1% (97.1%~99.7%) の除去率であった。凝集沈殿工程での除去率が高く, SS除去に伴いダイオキシン類も除去され, SSとともにダイオキシン類も凝集沈殿汚泥中に濃縮されたものと考えられた。ダイオキシン類の代替となる指標を日常的な分析項目から探したところ, いずれの施設でも各処理工程でSSとダイオキシン類は類似した挙動を示しながら減少した。特に同一施設ではSSとダイオキシン類の間に弱い正の相関が認められた。個々の施設においてSSとの相関性を把握していくことにより, SSがダイオキシン類除去の指標となると考えられた。

Dioxin removal efficiencies were examined in different kinds of leachate treatment systems at four landfill sites, and the relationship between dioxins and other parameters such as BOD, COD, DOC, SS were discussed.<BR>Dioxin concentrations ranged from 190 pg/L (2.1 pg-TEQ/L) to 8, 500 pg/L (130 pg-TEQ/L) in raw leachates, while ranging from 5 pg/L (0.0067 pg-TEQ/L) to 120 pg/L (1.1 pg-TEQ/L) in final effluents. Removal rates after the total treatment process were 97-99%. High removal efficiency of coagulating sedimentation process showed that dioxins contained in or adsorbed to suspended solids were removed through the coagulating sedimentation process.<BR>We estimated the amount of dioxins removed by the leachate treatment processea and accumulated in the sludge generated from the process. As the estimated amounts were almost similar, it can be concluded that dioxins removed from raw leachates concentrated mainly into the sludge formed in the treatment process.<BR>Dioxin concentrations showed a similar behavior tendency for SS in the treatment processes, while a positive correlation between SS and dioxins were observed in each facility. These results indicate that the parameter SS might be used as a substituting indicator for checking dioxin concentration.<BR>Further studies are necessary in order to clarify the detailed mass balance of dioxins in leachat treatment facility.

Journal

  • Journal of the Japan Society of Waste Management Experts

    Journal of the Japan Society of Waste Management Experts 13(3), 151-160, 2002-05-31

    Japan Society of Material Cycles and Waste Management

References:  26

Cited by:  2

Codes

  • NII Article ID (NAID)
    10008540089
  • NII NACSIS-CAT ID (NCID)
    AN10414685
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    1883-1648
  • NDL Article ID
    6191561
  • NDL Source Classification
    ZN5(科学技術--建設工学・建設業--都市工学・衛生工学)
  • NDL Call No.
    Z16-2213
  • Data Source
    CJP  CJPref  NDL  J-STAGE 
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