METHOD OF TREATING ORGANIC SLUDGE

摘要

PROBLEM TO BE SOLVED: To provide a treating technique for organic sludge by which ammonia nitrogen contained in a dehydration separated liquid from anaerobic digested sludge is efficiently nitrified and denitrified with less aeration and the addition of an organic material as much as possible and a nitrogen load on a waste water treatment plant, to which the dehydration-separated liquid is returned, is reduced. SOLUTION: After being concentrated into high concentration to have 5-20 wt.% solid, the organic sludge produced in the waste water treatment plant is anaerobically digested and the digested sludge is dehydrated. The dehydration separated liquid is nitrite type-denitrified under a condition that the concentration of ammonia nitrogen in a nitrification tank is≤500 mg/L and the treated water is returned to the waste liquid treatment plant. COPYRIGHT: (C)2007,JPO&INPIT