Rate of hexabromocyclododecane decomposition and production of brominated polycyclic aromatic hydrocarbons during combustion in a pilot-scale incinerator  

作　　者：Yuichi Miyake Masahiro Tokumura Qi Wang Takashi Amagai Yuichi Horii 

机构地区：[1]University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka 422-8526, Japan [2]Center for Environmental Science in Saitama, 914 Kamitanadare, Kazo, Saitama 34F-0115, Japan

出　　处：《Journal of Environmental Sciences》2017年第11期91-96,共6页环境科学学报（英文版）

基　　金：supported by a Grant-in-Aid for Scientific Research (KAKENHI) from the Japan Society for the Promotion of Science (No. JP16H05891);the Steel Foundation for Environmental Protection Technology;the Environment Research and Technology Development Fund (No. 3K153003) of the Ministry of the Environment, Japan;a Health and Labor Sciences Research Grant of the Ministry of Health, Labor and Welfare, Japan

摘　　要：Here, we examined the incineration of extruded polystyrene containing hexabromocyclododecane（HBCD） in a pilot-scale incinerator under various combustion temperatures（800–950℃） and flue gas residence times（2–8 sec）. Rates of HBCD decomposition ranged from 99.996%（800℃, 2 sec） to 99.9999%（950℃, 8 sec）; the decomposition of HBCD, except during the initial stage of combustion（flue gas residence time 〈 2 sec）, followed a pseudo-first-order kinetics model. An Arrhenius plot revealed that the activation energy and frequency factor of the decomposition of HBCD by combustion were 14.2 kJ/mol and 1.69 sec^（-1）,respectively. During combustion, 11 brominated polycyclic aromatic hydrocarbons（BrPAHs）were detected as unintentional by-products. Of the 11 BrPAHs detected, 2-bromoanthracene and 1-bromopyrene were detected at the highest concentrations. The mutagenic and carcinogenic BrPAHs 1,5-dibromoanthracene and 1-bromopyrene were most frequently detected in the flue gases analyzed. The total concentration of BrPAHs exponentially increased（range,87.8–2,040,000 ng/m^3） with increasing flue gas residence time. Results from a qualitative analysis using gas chromatography/high-resolution mass spectrometry suggest that bromofluorene and bromopyrene（or fluoranthene） congeners were also produced during the combustion.Here, we examined the incineration of extruded polystyrene containing hexabromocyclododecane（HBCD） in a pilot-scale incinerator under various combustion temperatures（800–950℃） and flue gas residence times（2–8 sec）. Rates of HBCD decomposition ranged from 99.996%（800℃, 2 sec） to 99.9999%（950℃, 8 sec）; the decomposition of HBCD, except during the initial stage of combustion（flue gas residence time 〈 2 sec）, followed a pseudo-first-order kinetics model. An Arrhenius plot revealed that the activation energy and frequency factor of the decomposition of HBCD by combustion were 14.2 kJ/mol and 1.69 sec^（-1）,respectively. During combustion, 11 brominated polycyclic aromatic hydrocarbons（BrPAHs）were detected as unintentional by-products. Of the 11 BrPAHs detected, 2-bromoanthracene and 1-bromopyrene were detected at the highest concentrations. The mutagenic and carcinogenic BrPAHs 1,5-dibromoanthracene and 1-bromopyrene were most frequently detected in the flue gases analyzed. The total concentration of BrPAHs exponentially increased（range,87.8–2,040,000 ng/m^3） with increasing flue gas residence time. Results from a qualitative analysis using gas chromatography/high-resolution mass spectrometry suggest that bromofluorene and bromopyrene（or fluoranthene） congeners were also produced during the combustion.

关 键 词：Brominated polycyclic aromatic hydrocarbons Flame retardant Hexabromocyclododecane（HBCD） INCINERATOR Persistent organic pollutants（POPs） 

分 类 号：X592[环境科学与工程—环境工程]