钢厂烧结机烟气排放对土壤二噁英浓度的影响

摘要

为分析钢铁烧结机排放二噁英沉降对土壤污染的影响,根据2016年河北某钢铁厂烧结机头二噁英排放监测数据、土壤监测数据等,建立了基于 CALPUFF 数值模型的钢铁烧结机排放二噁英类污染物沉降土壤的计算方法.结果显示,该企业烧结机二噁英毒性当量为0.017~0.025ng-TEQ/Nm3,排放因子为0.044~0.081μg-TEQ/t,3个土壤监测点二噁英浓度结果为0.82~2.4ng/kg,采用CALPUFF模式模拟烧结机二噁英对土壤监测点沉降量结果为1.46~3.44ng/kg,模拟结果与周边土壤监测点实测趋势一致.%In order to investigate the influence of dioxins emitted from iron-steel sintering machines on soil pollution, both monitored data by a steel plant in Hebei Province in 2016 and CALPUFF simulations are used to design a method to estimate the amount of sintering-emitted dioxins that is deposited in the surrounding soil. Results show that the toxicity equivalency quantity (TEQ) of dioxin in exhaust gas from the sintering machines of this steel plant is 0.017~0.025ng-TEQ/Nm 3 . The emission factor is 0.044~0.081ug-TEQ/t. The concentration of dioxins in three soil samples ranges from 0.82 to 2.4ng/kg, which is consistent with the simulated results by CALPUFF (1.46~3.44ng/kg).