| 摘要 |
PROBLEM TO BE SOLVED: To provide an advanced treatment method for sewage/wastewater capable of effectively utilizing solid organic matter in inflow sewage/wastewater as an organocarbon source necessary for denitrification. SOLUTION: In biological denitrification treatment for biologically removing nitrogen in sewage/wastewater, sewage/wastewater containing the solid organic matter no passed through a solid-liquid separation process is guided to a denitrification tank 2 for generating a circulating flow over ascending and decending flow zones 8 and 9 and at least one of a ferrous or aluminum type inorganic flocculant and a polymeric flocculant is added to the inflow sewage/ wastewater to form flocculated flocs 20 and the ascending predetermined speed corresponding to the sedimentation speed of the flocculated flocs 20 is applied to the mixed liquid in the tank in the ascending flow zone 8 of the denitrification tank 2 by an ascending flow to form flocculated lump 21, wherein the flocculated flocs 20 are stagnated in a fluidized state, in the lower region of the ascending flow zone 8.
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