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PCDDs/DFs emissions from crematories in Japan.

N Takeda1, M Takaoka, T Fujiwara

  • 1Graduate School of Engineering, Kyoto University, Japan.

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Summary
This summary is machine-generated.

Polychlorinated dibenzodioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) were measured in crematory emissions. Crematory design and operation influence these emissions, with Japan

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Area of Science:

  • Environmental Chemistry
  • Pollution Control
  • Toxicology

Background:

  • Polychlorinated dibenzodioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) are persistent organic pollutants.
  • Cremation processes can be a source of PCDD/PCDF emissions.
  • Understanding these emissions is crucial for environmental protection and public health.

Purpose of the Study:

  • To measure PCDD/PCDF concentrations in crematory emissions.
  • To investigate the relationship between crematory characteristics and emissions.
  • To estimate the total national emission of PCDDs/DFs from crematories in Japan.

Main Methods:

  • Emission gas sampling from 10 crematories.
  • Analysis of PCDD and PCDF concentrations using established methods.
  • Correlation analysis between emission levels and crematory operational factors.

Main Results:

  • PCDD/PCDF concentrations ranged from 2.2-290 ng/N m3 (TEQ: 0.0099-6.5 ng TEQ/N m3).
  • PCDF concentrations were generally higher than PCDD concentrations.
  • Emissions were highest in the initial 20 minutes of cremation and influenced by secondary combustion chambers and dust collectors.
  • Total estimated annual emission for Japan was 8.9 g TEQ/yr.

Conclusions:

  • Crematory design, including secondary combustion chambers and dust collectors, significantly impacts PCDD/PCDF emissions.
  • Operational factors, particularly the early stages of cremation, are critical for emission control.
  • National emissions from crematories represent a notable source requiring management strategies.