| OCR Text |
Show with or without metallic chloride additives were caused by various temperatures and oxygen supplies. The Pha, Flu and Pyr distributions between the solid and gas phases at various pyrolysis temperatures were shown in Figure 3 and the relationship should be expressed as Log K = -A/T + B Eq-1 in which K = PAH(gaS)/(PAH(soiid)/Particle) T = the temperature of the second stage incinerator (°CK) A, B: constants From the results, log(K) values, the ratios between the PAHs in gas phase and the PAHs in solid phases(per particulates weight; 1/mg), increased as the stage-two pyrolysis temperature increased. When the stage-two incineration system was controlled at 900 °C and various oxygen supplies, the maximum value of log(K) occurred at 0.0525 02-Nl/min and log(K) value decreased as the oxygen supply increased, as shown in Figure 4 and the constants, A and B, were shown in Table 2. From the results of the TA98 Ames test in Table 3, when P.S. was pyrolysed from 700 °C to 1200 °C, the mutagenicity was increased as the stage-two temperature increased, as shown in Figure 5. The maximum mutagenicity of particulates extracts occurred at 1100 °C and were about 3000 Revs/plate for adding BaCh and NaCl. When the stage-two temperature increased to 1200 °C, the mutagenicity of those decreased. The mutagenicity of particulates and PUF extracts at stage-two temperature of 900 °C and various oxygen supplies were shown in Table 4. When oxygen supply was increased from 0 Nl/min to 0.210 Nl/min, the mutagenicity of particulates extracts from the PS incineration with metallic chloride additives was till more stronger. Those results were surprising and they were very different from the previous results from the incineration of polystyrene without metallic chloride additives! 15]. Also, the correlations between mutagenicity and PAH7 ( BaP, BbF, BaA, IP, DbA, Tri and Chr) from polystyrene incineration with BaCh or NaCl additive at various operation conditions were not so well. The reasoning is that other toxic compounds (i.e., nitro-PAHs, dioxin and furan) were formed and should be identified in future research work. -5- |
