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

2001; Elsevier BV; Volume: 43; Issue: 4-7 Linguagem: Inglês

10.1016/s0045-6535(00)00431-8

1879-1298

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

Carcinogens and Genotoxicity Assessment

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/m3N, and toxic equivalent concentration was ranged from 0.064 to 24 ngTEQ/m3N. 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/m3N, and (3) installing the sampling point for monitoring of PCDDs/DFs.