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Zhao Y.,Shenzhen Center for Disease and Prevention | Zhao Y.,Shenzhen Energy Environment Engineering Company Ltd | Jiang Y.,Shenzhen Center for Disease and Prevention | Zhang J.,Shenzhen Center for Disease and Prevention | And 6 more authors.
Huanjing Kexue Xuebao/Acta Scientiae Circumstantiae | Year: 2015

Levels of PCDD/Fs in fly ash from eight incinerators in Shenzhen were accurately quantitative and qualitative analyzed using isotope dilution high resolution gas chromatograph/high resolution double-focusing magnetic mass spectrometry (HRGC/HRMS), and concentration and distribution of PCDD/Fs in fly ash from different furnaces and different types of waste were further compared. The results showed that concentrations of PCDD/Fs in fly ash varied largely. Both of the average mass concentration and TEQ concentration of PCDD/Fs in five reciprocating gate municipal wastes incinerators were less than those in pyrolysis medical incinerator. In the two hazardous waste incinerators, the PCDD/Fs levels of vertical drum hazardous waste incinerator were greater than those of rotary kiln hazardous waste incinerator. The distributions of PCDD/Fs homologues in fly ash from these eight incinerators were similar and the concentrations of higher-chlorinated PCDD/Fs homologues were remarkably higher than those of lower-chlorinated homologues. Moreover, the contribution rate of PCDD/Fs homologues to TEQ was quite similar in different incinerators, and 2, 3, 4, 7, 8-PeCDF, 1, 2, 3, 7, 8 PeCDD and 2, 3, 4, 6, 7, 8 HxCDF were the three predominant contributors to the total concentration of TEQ. Spraying activated carbon in front of the bag-type dust collector could effectively adsorb PCDD/Fs in flue gas and transfer them to fly ash. This study was the first to reveal the dioxins emissions from running waste incinerators in Shenzhen and provided important data for the monitoring of dioxin emissions. ©, 2015, Science Press. All right reserved.

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