| 摘要 |
<p>PURPOSE:To efficiently treat sewage in a minimized space by placing removably an inner case in which an outlet is provided outwardly in an outer case with a discharge port at its bottom buried underground and filling a filtering material around a soil intake section provided in the center of the inner case. CONSTITUTION:An outer case 17 with a discharge port 21 at its bottom is buried underground. Also, an inner case 2 with outlets 14 on its outer side is placed in the outer case 17 removably. A soil waste intake 4 is provided in the center of the inner case 2, and filter media 11 and 13 are filled around the intake 4. A space 19 is provided between the outer case 17 and the inner case 2, and the one side of the space communicates with open air, while the other side communicates with the filter media 11 and 13 through vent holes 15 provided on the side of the inner case 2. As a result, purification of soil water can be achieved more perfectly by utilizing a small volume of filter media efficiently and replacing the same easily after having used them in a given period of time.</p> |
