| 摘要 |
<p>PURPOSE:To increase the rate of generation of gaseous methane and to treat the residues of digesting liquid efficiently in the stage of subjecting org, waste to solid-liquid sepn. after anaerobic digestion, by combining heat treatment for the waste with the biological nitrification and nitrification and denitrification of the digesting liquid. CONSTITUTION:Org. waste (preferably the org. waste controlled to <=5pH) 1 is admitted into a heat treating device 2, where the waste is treated under heating for a short time preferably at >=175 deg.C. Such waste is charged into an anaerobic digesting tank 3 which is heat exchanged 9 with the device 2, and is allowed to stagnate therein for the time enough for digestion and is thereby subjected to an anaerobic digesting treatment under constant or occasional agitation. The waste flowing out from the tank 3 is treated in a biological nitrifying or biological nitrifying and denitrifying tank 4, whereafter an inorg. flocculating agent 5 is added thereto and the waste is treated in a solid-liquid separating device 6. The supernatant liqueur 8 produced in the solid-liquid separating stage is returned to the water treatment system, and if necessary part thereof may be admitted into the tank 3 and treated. Separated and dehydrated cake 7 is disposed after post treatments, for example, a mechanical dehydration stage.</p> |
