Decomposition of Dioxins in Fly Ash by Hydrothermal Treatment

DOI 4 Citations

Bibliographic Information

Other Title
  • 水熱処理による飛灰中のダイオキシン類の低減

Description

In order to reduce the toxicity of Municipal Solid Waste Incinerator (MSWI) fly ash containing polychlorinated dibenzodioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs), well-known as highly toxic organic pollutants, fly ash was hydrothermally treated.<BR>Under hydrothermal conditions, concentration of PCDDs and PCDFs decreased due to dechlorination reaction. This reaction occurred more effectively with high temperature and the existence of alkaline ingredients and/or methanol in solvent. Even at 373 K, which is relatively lower than the operating temperatures of thermal decomposition technique, the dechlorination reaction took place. PCDDs/PCDFs decomposed almost completely and toxicity of treated ash decreased to 0.03ng-TEQ/g at 573 K for 20 min with the solvent of 1 N NaOH solution and methanol. Estimated activated energy for the reaction, assuming that the whole of PCDDs/ PCDFs was one chemical species, was about 13 kcal/mol and reaction rate constant k was expressed as k=2.27×104exp {-13.2/ (RT) } .

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Details 詳細情報について

  • CRID
    1390001205296793088
  • NII Article ID
    130001757427
  • DOI
    10.3985/jswme.5.193
  • ISSN
    1883163X
    18831648
  • Text Lang
    ja
  • Data Source
    • JaLC
    • Crossref
    • CiNii Articles
  • Abstract License Flag
    Disallowed

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