To surely prevent the leaching of polluted water to the outside.
This disposition plant has underground continuous walls 10 and permeable layers 12. These continuous walls 10 are made impervious and are closed by impermeable layers on their bottom end side. These permeable layers 12 are disposed in the intermediate positions of the continuous walls 10 and comprise permeable materials 12a and hole parts 12b for water feed and discharge. The bottom ends of the permeable materials 12a exist upper than the bottom ends of the continuous walls 10 and are installed down to the depth arriving at the impermeable layers. In this disposition plant, the water level of the permeable layers 12 is so controlled by a controller 22 as to be kept higher at all times than the water level of the waste 20. A first water level sensor 24 for detecting the water level of the permeable layers 12 and a second water level sensor 26 for detecting the water level of waste 20 are connected to this controller 22. A water feed pump 28 for feeding the water to the hole parts 12b and a water drain pump 30 for discharging the water from the hole parts 12b are connected to the controller.
TAKEMOTO MASAHIRO
ISHIDA MICHIHIKO
KUROIWA MASAO
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