二噁类化合物在生活垃圾焚烧飞灰中的分布

Distribution of dioxins-like compounds in air pollution control residues from municipal solid waste incinerator.

通过对上海市某生活垃圾焚烧发电厂飞灰中二噁[口英]类化合物的长期监测，分析了它们的含量分布和毒性当量浓度贡献率，以探讨飞灰中二噁[口英]类化合物的污染特征．结果表明，飞灰中多氯代二苯并呋喃（PCDFs）中1，2，3，4，6，7，8-HpCDF和1，2，3，7，8-PeCDF百分含量之和为36％～39％，2．3，4，7，8-PeCDF对PCDFs毒性当量浓度贡献率最大（〉50％）；多氯代二苯并-对-二噁[口英]（PCDDs）中OCDD百分含量为46％-58％．1，2，3，4，6，7，8-HpCDD百分含量为28％～32％，而对PCDDs毒性当量浓度贡献最大的是1，2，3，7，8-PeCDD（55％-61％）；多氯联苯（PCBs）中以3，3’，4，4’-TeCB和3，3’，4，4’，5-PeCB百分含量较高，而且3，3’，4，4’，5-PeCB对毒性当量浓度贡献率占PCBs的94％以上．尽管不同取样时间的飞灰中噁[口英]毒性当量浓度变化较大，但二噁[口英]类化合物却具有相似的分布规律，对毒性当量浓度贡献率最大的是2，3，4，7，8-PeCDF（29％～33％），其次是1，2，3，7，8-PeCDD（21％～26％）。

Through long term monitoring of dioxin-like compounds in the air pollutiotl control （APC） residues from a certain municipal solid waste incineration power plant in Shanghai, their content distribution and toxicity equivalence quantity （TEQ） contribution rate were analyzed to explore the pollution character of dioxins in the ash. The contents of 1,2,3,4,6,7,8-HpCDF and 1,2,3,7,8-PeCDF were 36%-39% in polychlorinated dibenzofurans （PCDFs）, and the TEQ contribution rate of 2,3,4,7,8-PeCDF was the greatest （〉50%） for PCDFs. In polychlorinated dibenzo-p-dioxins （PCDDs）, OCDD content was 46%-58% and 1,2,3,4,6,7,8-HpCDD content was 28%-32%; while 1,2,3,7,8-PeCDD contributed most greatly （55%-61%） to TEQ for PCDDs. In polychlorinated biphenyls （PCBs） the contents of 3,3＇,4,4＇-TeCB and 3,3＇,4,4＇,5-PeCB were higher; and the TEQ contribution rate by the latter occupied above 94% of PCBs. Though the TEQ concentration of dioxins in the ash varied with time, similar distribution was found. The TEQ concentration was mainly contributed by 2,3,4,7,8-PeCDF （29%-33%） and 1,2,3,7,8-PeCDD （21%-26%）.