| 摘要 |
PROBLEM TO BE SOLVED: To stabilize waste uniformly in early stages by keeping the air permeability and water permeability of a disposal site and preparing the environment suitable for inhabitation of a microbe. SOLUTION: A bottom leachate collection drainage ditch 1 is prepared by covering the concavely-dug hardpan 2 of the disposal site with a water barrier sheet 3 and a nonwoven fabric 4, laying a protecting material 5 such as sand and gravel on the nonwoven fabric 4, installing a perforated pipe 6 and forming a perforated pipe 6-surrounded layer from a surrounding member 7b formed by sticking a plurality of spherical materials 7a consisting of an expanded resin to one another. Since the surrounding member 7b has a gap 8 among the adjacent spherical materials 7a and the gaps 8 communicate with one another in a three-dimensional form, the surrounding member 7b exhibits functions of smoothing drainage and permeating air and water to supply oxygen and water to the microbe. Since the surrounding member 7b is made to have 40-50% porosity, the functions of smoothing drainage and permeating air can be kept stably over a long period of time. COPYRIGHT: (C)2006,JPO&NCIPI
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