| 摘要 |
PROBLEM TO BE SOLVED: To drastically reduce installation costs and maintenance costs of an urban-type concentrated sewage plant by using a small septic tank as a concentrated sewage plant for a small block, to enable each local government to implement plans of installing the small septic tanks as a leading institution, and to develop and construct the sewage plants nationwide in a short period of time. SOLUTION: Each district is divided into small blocks each composed of about 20 households, and the small sharable septic tank is set in each block. The septic tank is embedded in an open road managed by the local government, and effluent after sewage is led to an existing side ditch installed in the road or to an existing sewer. Each installed septic tank is managed by the local government. Odors which are problems raised when the septic tank is installed in the open road, is deodorized by means of a water filter by using a treated effluent, to thereby release the odors to the air. By virtue of this system, the plan is implemented by the local government as the leading institution at low construction and maintenance costs. COPYRIGHT: (C)2004,JPO
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