The invention discloses an A<2> / O-
biology synchronous
nitrogen and
phosphorus removal device for urban
sewage. The device comprises a pre-anoxic pond, an anaerobic pond, an anoxic pond, an aerobic pond and a
settling pond; the urban
sewage is conveyed to the pre-anoxic pond and the anaerobic pond through a water inlet, a
sewage lifting pump room with a coarse grille and a fine grille, an
aeration grit basin, a water pump and a water inlet
pipe; the interior of the pre-anoxic pond, the interior of the anaerobic pond and the interior of the anoxic pond are each provided with a submersible stirrer, the bottom of the aerobic pond is provided with an aerator, the aerobic pond is connected with the anaerobic pond through a
nitration mixing
reflux pipeline, the anoxic pond is connected with the anaerobic pond through an anoxic mixing
reflux pipeline, one part of
sludge at the bottom of the
settling pond is conveyed to a
sludge concentrating and
dewatering room, and the other part of the
sludge at the bottom of the
settling pond is connected with the pre-anoxic pond through a
reflux sludge pipeline. The invention further discloses an A<2> / O-
biology synchronous
nitrogen and
phosphorus removal method for the urban sewage. According to the A<2> / O-
biology synchronous
nitrogen and
phosphorus removal device and method for the urban sewage, the influence of
nitrate on the anaerobic phosphorus releasing process is reduced or eliminated, the
carbon source demands for anoxic
denitrification nitrogen removing and anaerobic
phosphate releasing are balanced, and the efficient nitrogen and phosphorus removal effects are achieved.