| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a cost-effective treatment method for nitrogen-containing organic wastewater capable of reducing the amount of excess sludge generated in performing activated sludge treatment for nitrogen-containing organic wastewater to be cleaned and of stably removing nitrogen, and a treatment apparatus employed for the method. <P>SOLUTION: In the treatment method for nitrogen-containing organic wastewater, solid-liquid separation for treated liquid is performed after nitrogen-containing organic wastewater is treated in an activated sludge treatment tank. The separated water is released as treated water to return the separated sludge to the activated sludge treatment tank. A portion or all of the sludge returned to the activated sludge treatment tank is concentrated in a membrane separation sludge concentration tank having a sludge densitometer. Thereafter, solubilization treatment is performed for a portion of the concentrated sludge to be returned to the activated sludge treatment tank, while the remaining of the concentrated sludge is extracted out of the sludge concentration tank to the outside as excess sludge. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
