Kurita Water Industries Ltd.

Hidenari Yasui

Tetsuro Fukase

Masahide Shibata

Rajeev Goel

A process and an apparatus for an aerobic biological treatment of aqueous organic wastes, in which the aqueous organic waste is supplied to an aeration tank for an aerobic biological treatment in the presence of a biosludge composed essentially of aerobic microorganisms. The aerated aqueous suspension in the aeration tank is subjected to solid/liquid, separation, the so-separated liquid phase is removed as treated water, at least a portion of the separated sludge is recycled to the aeration tank, a part of the aqueous suspension in the aeration tank or of the separated sludge is treated with ozone at a pH of 5 or lower, and the ozonized suspension or sludge is recycled to the step of aerobic biological treatment. The biosludge is transformed into BOD components using a decreased amount of ozone to thereby decrease the amount of excess sludge and, in some cases, even reduce it to zero.

Process for biological treatment of aqueous organic wastes

An apparatus and method for the biological removal of phosphorus, in which raw water is introduced into the anaerobic tank together with returned sludge from the sludge return pipe Some of the water in the anaerobic tank is sent to the solid/liquid separating device and the rest is sent to the aerobic tank Some of the water which contains the released phosphorus in the anaerobic tank is sent via the pipe to the second solid/liquid separating device and subjected to a solid/liquid separation treatment. The separated water fraction is sent to the phosphorus-removing apparatus and the phosphorus is removed. Some of the solid fraction is introduced into the anaerobic tank The remainder is sent from the pipe to the solubilizing tank and subjected to a solubilizing treatment, and then it is returned to the anaerobic tank

Biological method of phosphorus removal and biological phosphorus-removing apparatus

Apparatus and method for ozone-treating biosludges

A powder of magnetized material is added to an aeration chamber, and aeration is conducted. The mixture is then sent to a sedimentation chamber, and solid-liquid separation is conducted. A portion of the precipitated sludge is returned to the aeration chamber as return sludge and reused. Sedimented sludge is highly concentrated, due to the action of the magnetized material. By returning a portion to the aeration chamber as return sludge, the biomass concentration becomes high, and high load operation in the aeration chamber can be achieved.

Sedimentation acceleration agent for activated sludge and method for using the same

An apparatus and a method for ozone-treating biosludges and of reducing biosludges occurring upon a biological treatment of aqueous organic waste, wherein the apparatus is made up of

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Tokyo, Japan

Hidenari Yasui