2020 Volume 15 Issue 3 Pages 455-463
In order to evaluate the performance of a bio-pile remediation system, the large-scale demonstration test was conducted. In this test, the oxygen concentration in the bio-pile gradually decreased with time, and the oxygen required for the degradation could not be supplied. The reason was considered that gas leakage occurred at the boundary between the gas extraction pipe and the soil embankment. This study aimed to clarify the effects of the gas leakage on the oxygen concentration in the soil using numerical simulation with an original boundary condition which can express them. As the results, it became clear that the decrease in the oxygen concentration observed in the demonstration test was significantly dependent on the gas leakage. When the gas leakage was prevented, the oxygen concentration in the soil embankment could be kept to a required level without large flow rate. The volume of the soil which can be remedied in the bio-pile system could be also increased to about three times as much as that under gas leakage.
