DEVELOPMENT OF THE EXPERIMENTAL DEVICE FOR WATER-NAPL-AIR THREE-PHASE FLOW FOR PURIFICATION OF THE OIL POLLUTED GROUND

1.采用机油和煤油作为空气三相渗透系数的空气真空柱实验装置的研制。以去年测试的煤油为例，计算值较准确地描述了实验水-萘酚-空气三相渗透系数。另一方面，在本年度测试的发动机油中，计算出的水渗透系数值大于实验值。认为机油的低渗透率影响了水的流动。研制了水-萘酚-空气三相渗透系数空气真空塔实验装置，指出了今后实验需要改进的地方。水-萘酚-空气三相毛细管压力-饱和关系重力平衡柱实验装置的研制实验过程中存在蒸发现象，导致实验结果与计算结果不匹配。通过对蒸发水量和地下水位的修正，解决了这一问题。研究了利用表面活性剂测定土壤中NAPL体积的方法。为此，建立了重力平衡柱实验装置，用于观察水-萘酚-空气三相毛细管压力-饱和度关系。小型二维土槽试验装置的研制，研究了水-空气三相毛细管压力-饱和关系。利用小型二维土槽对煤油和机油进行了渗透实验。水毛细上升干扰了油井的排油。这个问题通过使用局部狭缝解决了。这种情况经常发生，以至于观测井的油深越来越厚，水面消失了。通过对不同粒径土样柱试验结果的比较，解决了这一现象的机理。

1.Development of the air vacuumed column experimental device for water-NAPL-air three-phase permeability coefficients Engine oil and kerosene were used as the NAPL. In the case of kerosene tested in last year, calculated values described experimental water-NAPL-air three-phase permeability coefficients very accurately. On the other hand, in the case of engine oil tested in this year, calculated water permeability coefficients values were larger than experimental values. It was thought that low permeability of engine oil effected water flow. The air vacuumed column experimental device for water-NAPL-air three-phase permeability coefficients was developed, and some points need improvements for future experiments were found.2.Development of the gravity equilibrium column experimental device for water-NAPL-air three-phase capillary pressure-saturation relationsDuring the experiments, evaporation was occurred and it caused the mismatch between experimental results and calculation. This problem was solved by correction of the volume of evaporated water and the height of water table. The methods to measure the volume of NAPL in the soil using surfactants were developed. As a result, the gravity equilibrium column experimental device was developed to observe the water-NAPL-air three-phase capillary pressure-saturation relations.3.Development of the small scale two dimension earth tank experimental device for water-NAPL-air three-phase capillary pressure-saturation relationsThe penetration experiments of kerosene and engine oil were conduced with small scale two dimension earth tanks. Drainage of oil in to the wells were disturbed by the water capillary rise. This problem was solved by using a partial slit. It was often occurred so far that the depth of oil in an observation well grew thick, and the surface of the water disappeared. The mechanism of this phenomenon was solved by comparing the column experiment result in different soil sample of particle size.