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Show P A H s and Mutagenicity in Air Emissions from Incineration of Polystyrene with Various Metallic Salt Additives JIANN-HWA YOU, Department of Chemical Engineering, Chang Gung College of Medicine and Technology, 259 Wen-Hua 1st Road, Kweishan, Taoyuan, Taiwan, R.O.C. PEN-CHI CHIANG, Graduate Institute of Environmental Engineering, National Taiwan University, 71,Chou-Shan Road, Taipei, Taiwan, R.O.C. KUN-TEN CHANG and SHENQ-CHYI CHANG Department of Biochemistry, National Yang-Ming Medical College, Taipei, Taiwan, R.O.C. INTRODUCTION With the increase in environmental consciousness among the people, traditional solids-waste handling method, landfill and incineration, are meeting increasingly public resistance at site area. Especially, air emissions from the incineration are now faced not only with concerns of traditional air pollutants, but with issues of air toxics, such polycyclic aromatic compounds (PAHs), dioxins, and furans. PAHs, which are thought to be the precusors of soots and have also been known to be mutagenic or carcinogenic after being metabolized, are commonly produced from the incomplete combustion processes[l-5]. The formation of PAHs and soot particulates in the incineration of organic compounds not only depends on temperature, residence time and oxygen supply , but also depends on additives, e.g. Ch and metallic salts. Because complex mechanisms are involved in the incineration ( or combustion ) processes, the influence of PAHs and soot particulates are not yet clearly understood and various hypotheses, such as ionic chemical mechanism , hydroxyl radical equilibrium and electrostatic effects, are proposed from various experimental systems and results[6-10]. Dependence of PAHs induced mutagenicity on the bay region of the molecule and on the activating cytochrome P-450 enzyme has ever been |
