摘要
采用现场监测方式调查了西南地区6家干法水泥窑废气中PCDD／Fs排放情况．结果表明，未协同处置废物的水泥生产企业PCDD／Fs排放浓度范围（以TEQ计）为0．0029～0．0062ng·m^-3，平均0．0043ng·m^-3；添加污泥作为原料和燃料的水泥企业的PCDD／Fs排放水平为0．028ng·m^-3．所有水泥窑的二嗯英浓度都明显低于我国水泥工业大气污染物排放标准（0．1ng·m^-3）．6家水泥企业PCDD／Fs排放因子为0．0089—0．084μg·t^-1，接近或低于UNEP发布的水泥行业最低排放因子（0．05μg·t^-1）；其中协同处置污泥水泥窑的最高，约为其他5家平均排放因子（0．011μg·t^-1）的7．6倍．另外，两类水泥窑废气PCDD／F异构体分布特征存在明显差异．结果表明，采用现代预热干法工艺的水泥企业的二嗯英排放水平较低，可进一步开发我国水泥企业协同处置废物的能力．
Six cement kilns were measured for emissions of PCDD/Fs in the Southwest Area, China. The results indicated that the emission levels of PCDD/Fs were 0. 002 9-0. 006 2 ng·m^-3 （ Average, 0. 004 3 ng·m^-3 ） from cement kilns which did not burn solid waste, and 0,028 ng·m^-3 from co-processing sewage sludge in cement kiln. The levels of PCDD/Fs emissions from cement manufacturing in the Southwest Area were significantly below the national emissions standard （0. 1 ng·m^-3）. Emission factors of PCDD/Fs from the six cement kilns varied between 0. 008 9 and 0. 084 μg·t^-1 cement, which were near or below the lowest emission factor reported by UNEP in 2005. Moreover, the emission factor of PCDD/Fs from co-processing sewage sludge in cement kiln was 7.6 times of the average factors from the other five cement kilns. Moreover,congener distribution of PCDD/F in stack gas from the two types of cement kilns was very different. The results showed that modern dry process cement kilns with preheating have lower emissions of PCDD/Fs. This suggested that the product of co-processing solid waste in cement kilns should be largely enhanced in China in future.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2014年第1期35-40,共6页
Environmental Science
基金
重庆市科技创新能力建设项目(cstc2011pt-kyys20002)
环境保护公益性行业科研专项(201109001-06)
关键词
水泥窑
二英
排放因子
固体废物
大气排放
cement kilns
dioxin
emission factor
solid waste
atmospheric emission
