To greatly increase a sewage treatment capacity by efficiently treating suspended organic matter and sludge with fermentative bacteria by ultra-atomization; to finally make the sludge zero.

Sewage treatment equipment 1 comprises an ultra-atomizing device 20 which supplies sewage sucked by a high-pressure pump P1 from a storage tank 13 receiving the supply of the sewage containing collected night soil from a receiving tank 11, to a ring passage at a high speed of ≥8 m/sec, and ultra-atomizes sewage clusters and the contained organic matter to a micron level at least by the shearing action of a high-speed water flow to return them to an agitation tank 14, an aeration tank 15 which receives the supply of the ultra-atomized sewage and the fermentative bacteria from the agitation tank, and performs aeration treatment, a fermentative bacteria supply device 5 which supplies the fermentative bacteria to the receiving tank and agitation tank, a settling tank 16 which receives the supply of the aerated sewage from the aeration tank, and separates the sewage into supernatant water and settled sludge, a post-treatment part 17 which receives the supply of the supernatant water from the settling tank, and discharges the treated water, and a biological treatment device 18 which receives the supply of the sludge from the settling tank, and performs biological treatment.

COPYRIGHT: (C)2006,JPO&NCIPI