Measures to prevent emissions of PCDDS/DFs and co-planar PCBs from crematories in Japan

Nobuo Takeda, Masaki Takaoka, Takeshi Fujiwara, Hisayuki Takeyama, Shoji Eguchi

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


In this study, PCDDs/DFs and co-planar PCBs concentrations in flue gases from 17 crematories and in fly ashes and bottom ashes (mainly bone) from several crematories were measured to grasp the present state of PCDDs/DFs emissions from crematories. The effects of several factors were discussed to prevent PCDDs/DFs emissions from crematories. Total concentration (normalized by 12% O2) of PCDDs/DFs was ranged from 4.9 to 1200 ng/m3 N, and toxic equivalent concentration was ranged from 0.064 to 24 ng TEQ/m3 N. As the results obtained in this research, the following measures to reduce PCDDs/DFs emission are recommended for existing crematories: (1) keeping the temperature at 800°C in main/secondary chambers during a whole cremation, and (2) lowering the temperature in the dust collector. For newly installed crematories, following measures to prevent PCDDs/DFs emission including the measures for existing ones are recommended: (1) connecting one secondary chamber to one main chamber, (2) installing the high efficiency dust collector and reducing dust concentration to less than 0.01 g/m3 N, and (3) installing the sampling point for monitoring of PCDDs/DFs.

Original languageEnglish
Pages (from-to)763-771
Number of pages9
Issue number4-7
Publication statusPublished - 2001
Externally publishedYes


  • Co-planar PCBs
  • Crematory
  • Emission control
  • PCDDs/DFs

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • General Chemistry
  • Pollution
  • Health, Toxicology and Mutagenesis


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