| 摘要 |
PROBLEM TO BE SOLVED: To obtain carbide low in salt concn. which can be restored to farmland or a green tract of land to be reutilized as resources by subjecting org. waste to biological treatment to separate the same into sludge and treated water and carbonizing the sludge to obtain carbide and washing this carbide with the treated water. SOLUTION: Org. waste such as excretion treated sludge, sewage sludge or garbage is biologically treated in a biological treatment equipment 1 having a solid-liquid separation means to be separated into sludge and treated water, and the separated sludge is carbonized in a carbonizing apparatus 2 to obtain carbide, which is, in turn, washed with a part of the treated water, which is obtained in the biological treatment equipment, in a carbide washing equipment. The washed carbide is dried in a drying equipment 4 to be taken out as a product, but in this drying, the heat of the exhaust gas of the biological treatment equipment is effectively utilized. The remainder not used in the washing of carbide of the treated water of the biological treatment equipment is discharged out of the system and further highly treated if necessary to be reutilized or discharged. Water obtained by highly treating this biologically treated water may be used in the washing of carbide.
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