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

1.水-非水相液体-空气三相渗透系数空气真空柱实验装置的研制非水相液体分别采用机油和煤油。在去年测试的煤油的情况下，计算值非常准确地描述了实验的水-NAPL-空气三相渗透系数。另一方面，在今年测试的发动机油的情况下，计算的水渗透系数值大于实验值。认为机油渗透率低是影响水流动的主要原因。研制了水-NAPL-空气三相渗透系数的真空柱实验装置，并对今后的实验进行了改进。2.水-NAPL-空气三相毛细压力-饱和度关系的重力平衡柱实验装置的研制在实验过程中，存在蒸发现象，导致实验结果与计算结果不一致。通过对蒸发水量和地下水位高度的修正，解决了这一问题。建立了用表面活性剂测定土壤中非水相液体体积的方法。研制了水-NAPL-空气三相毛细管压力-饱和度关系的小型二维土罐实验装置在小型二维土罐上进行了煤油和发动机油的渗透实验。油向威尔斯井的排油受到水毛管上升的干扰。这个问题通过使用部分狭缝解决。这种情况经常发生，以至于观察井中的石油深度变厚，水面消失。通过对不同粒径土样的室内土柱试验结果的比较，分析了这一现象的机理。

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.