排放源烟道气二噁英空间分布对监测结果的影响

针对生活垃圾焚烧企业烟气排放烟囱6个断面单点采样的试验结果，分析按照《固定污染源排气中颗粒物测定与气态污染物采样方法》（GB／T16157-1996）多断面点采样与单一固定断面点采样对监测结果的影响。试验表明，烟道气在不同断面点质量浓度分布差异较大，相对于样品实际监测值，各断面点二噁英毒性当量浓度最大正偏差达到＋306％，最大负偏差达到-96％，测定的18个断面点样品，只有2个样品与实际样品监测值相近

排放源烟道气二噁英空间分布对监测结果的影响

针对生活垃圾焚烧企业烟气排放烟囱6个断面单点采样的试验结果，分析按照《固定污染源排气中颗粒物测定与气态污染物采样方法》（GB／T16157-1996）多断面点采样与单一固定断面点采样对监测结果的影响。试验表明，烟道气在不同断面点质量浓度分布差异较大，相对于样品实际监测值，各断面点二噁英毒性当量浓度最大正偏差达到＋306％，最大负偏差达到-96％，测定的18个断面点样品，只有2个样品与实际样品监测值相近

天然维生素E油中PAH4连续脱除工艺研究Continuously removal of PAH4 from natural tocopherol oil

建立了一种天然维生素E油连续通过颗粒活性炭的固定床吸附工艺，从而实现有效脱除其中含有的微量多环芳烃（PAHs）。通过单因素实验分别考察了料液比、体系温度、物料在填料中的吸附时间对PAH4（苯并（a）芘、苯并（a）蒽、苯并（b）荧蒽、）脱除效果的影响，并通过正交实验进行了工艺条件优化。同时，考察了PAH4脱除过程对天然维生素 E含量的影响。结果表明：以95%乙醇为溶剂，料液比（天然维生素E油与溶剂比）1∶ 3，体系温度40 ℃，在以颗粒活性炭为填料的固定床内吸附4 h的条件下，可使天然维生素E油中PAH4的残留量降至7.3 μg/kg（其中苯并（a）芘含量为1.8 μg/kg），符合欧盟标准要求的苯并(a)芘含量小于或等于2 μg/kg，PAH4含量小于或等于10 μg/kg的限量标准，且采用该PAH4脱除工艺后维生素 E的含量没有受到明显影响。A method of continuously removing PAH4 from natural tocopherol oil through a fixed bed with granular activated carbon was established.The effects of ratio of material to solvent, system temperature and adsorption time on the removal effect of PAH4 were studied by single factor experiment and orthogonal experiment, and the effect of removal process on the content of natural tocopherol was investigated. The results showed that when 95% ethanol was used as solvent, the ratio of natural tocopherol oil to solvent was 1∶ 3, system temperature was 40 ℃ and stayed in a fixed bed filled with granular activated carbon for 4 h, the content of PAH4 in natural tocopherol oil was 7.3 μg/kg (benzo(a)-pyrene content 1.8 μg/kg), which could meet the EU limit standard(benzo(a)-pyrene content less than and equal to 2 μg/kg, PAH4 content less than and equal to 10 μg/kg), and the content of tocopherol was not significantly affected by the removal process