多孔介质中柴油的挥发和残留特性

Volatilization and Residence of Diesel Oil in Porous Mediums

研究了柴油在多孔介质中的挥发、淋溶和残留特性。实验结果表明:亚黏土中柴油挥发率最高,达22.1%;细砂次之,为19.8%;粗砂最低,为12.4%;初始阶段淋溶液中柴油质量浓度较高,随后逐渐减小并趋于稳定;淋溶状态下,粗砂、细砂和亚黏土中柴油释放速率依次降低;挥发和淋溶后,粗砂、细砂和亚黏土中的柴油残留量为30.0～40.0 mg/g;亚黏土中的柴油极限残留量最高,在2.0 mg/g以上,粗砂中的柴油极限残留量最低,约0.1 mg/g。

The volatilization, leaching and residence of diesel oil in porous medium were studied. The experimental results show that： The volatilization rates of diesel oil in loam, fine sand and coarse sand are 22.1%, 19.8% and 12.4% respectively; The mass concentration of oil in leaching effluent is high in the initial stage, then is decreased gradually and is tended to be stable; During the leaching process, the release rates of diesel oil from coarse sand, fine sand and loam are decreased in turn; After volatilization and leaching, the diesel oil residues in coarse sand, fine sand and loam are 30.0 - 40.0 mg/g ; The diesel oil residue limit in loam is the highest （ over 2.0 mg/g）, while that in coarse sand is the lowest （about 0.1 mg/g）.