抄録
This study aims to the modification of the bio-slurping that used in LNAPL free product remediation. Whenever the variation of water-table in groundwater on seasonal, the pumping of groundwater decrease extract efficiency. The authors developed M-float type slurper to solve this situation. The modified slurper acts the end of extraction pipe by itself, because the M-float has a specific gravity between LNAPL layer and water-table. The M-float applied system has more efficient removal rate than conventional Pump & Treat method. Both the extraction ratio and quantity are increased as much as 8% in the M-float type system in comparison with conventional Pump & Treat system. As a result, the M-float type system can extract more rapidly than the conventional Pump & treat system. For that reason, the concentration of LANPL in contaminated soil declined more rapidly. The removal efficiency can be improved by increment of the distribution of subsurface vacuum. The vacuum of M-float applied test increased approximately 3kPa in compared with conventional Pump & Treat system. Consequently, the M-float can be used as the method of LNAPL removal in field scale.
