Shin-ichi Sakai*, Takahiro Ukai*, Shin-ya Urano*, Hiroshi Takatsuki*, Kazuo Nakamura** and Sayuri Kinoshita**

* Environment Preservation Center, Kyoto University
** Sanitation Bereau, Kyoto Municipal Goverment

+ Correspondence should be addressed to Shinichi Sakai:
(Yoshida-honmachi, Sakyo-ku, Kyoto 606-8501, Japan)

Abstract

A large quantity of PCDDs/DFs is discharged from municipal solid waste incinerators in Japan. In this study, a material flow of PCDDs/DFs was analyzed in a municipal solid waste incineration system. As a result, the total amount of PCDDs/DFs released, which contained PCDDs/DFs not only from emission gas but also from residues, was 160[micro]g TEQ/waste-ton and exceeded the amount of PCDDs/DFs input into the system (1.4-50[micro]g TEQ/waste-ton), and more than 90 percent of PCDDs/DFs released was contained in fly ash. As a consequence of the scenario analysis, in the case of controlling incinerators with high technologies, the total amount of PCDDs/DFs released was expected to be 3.65-34[micro]g TEQ/waste-ton, which was nearly equal to or below the amount of PCDDs/DFs input. In the case of melting or heating dechlorination of fly ash in addition, the total amount of PCDDs/DFs released was expected to be reduced to 0.85-4.6[micro]g TEQ/waste-ton.

Key words: PCDDs/DFs, municipal solid waste, total PCDDs/DFs release, material flow, waste fractions, RDF