Waste activated sludge treatment method and device

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PROBLEM TO BE SOLVED : To provide an activated sludge treatment technology for wastewater efficiently removing nitrogen and phosphorus from wastewater while preventing breeding of mold fungi, and preventing re-discharge of phosphorus to wastewater. SOLUTION : Activated sludge S is made to act on wastewater W in a treatment tank 10 to perform sludge treatment of denitrification of nitrate nitrogen and nitrification of ammonia nitrogen, part of which is taken into a first separation tank 30 to settle the activated sludge, and the settled activated sludge is separated from the wastewater before dissolved oxygen in the wastewater is lost. The remaining activated sludge is separated from the separated wastewater in a second separation tank 60 in an aerobic condition, and the activated sludge separated in the first separation treatment is added with new wastewater in a pre-treatment tank 40 and set in an anaerobic condition, is returned to the treatment tank and repeatedly subjected to sludge treatment, separation operation, pre-treatment and returning. When returning the pre-treated wastewater, the wastewater is subjected to the anammox treatment to remove nitrogen. COPYRIGHT : (C)2009, JPO&INPIT