To provide a waste water treatment apparatus treating sewage high in BOD incapable of being treated heterofore by an activated sludge method being a waste water treatment method utilizing microorganisms and suppressing the generation of waste sludge to bring the same to zero.
A waste water treatment apparatus is equipped with a raw water tank 24 in which waste is charged, an inductive aeration tank 30 in which the sewage in the raw water tank is charged, a logarithmically propagating aeration tank 38 in which primarily treated water of the inductive aeration tank 30 is charged, a sedimentation tank 50 sedimenting the secondarily treated water of the logarighmically propagating aeration tank 38, a collection tank 40 collecting water during treatment of the logarithmically propagation aeration tank 38 and a means 45 returning the collected water in the collection tank 40 to the inductive aeration tank. Microorganisms in a logarithmically propagating stage are used as seed bacteria by a biological fact such that microorganisms are generated to propagate and stagnated to die before long to make it possible of sludge water or waste water extremely high in BOD incapable of being treated by a conventional activated sludge method. As a result, the discharging treatment of sludge can be eliminated by returning the sediment generated in the sedimentation tank 50 to the raw water tank 24 without generating waste sludge itself to digest the same in such a treatment system.
TAKAHASHI KINICHI
KONABE TOSHIO