Sekisui Aqua Systems Co., Ltd.

Fumihiko Okagawa

Hitoshi Inoue

Rotating biological contactor-type sewage treatment equipment of the present invention comprises a treatment tank for storing sewage to be treated, a rotation shaft which extends across opposed side walls b of the treatment tank , a plurality of rotating discs mounted at a predetermined interval on the rotation shaft in such a manner that each disc is partly submerged in the sewage stored in the treatment tank , and a driving means for supplying a driving force to the rotation shaft in order to rotate the rotating discs . This equipment treats sewage by rotating the rotating discs on which aerobic bacteria are attached, thereby allowing the aerobic bacteria to contact the sewage and aerobically decompose pollutants in the sewage. Each of the rotating discs is composed of n portions of sector-shaped segments , wherein n is an integer not less than 1, and each of the sector-shaped segments is composed of two equally divided sector-shaped pieces . Each of the sector-shaped pieces has thin elements which form square grid-like meshes of the same size, except in the neighborhood of a periphery surrounding each sector-shaped piece ; and the thin elements extend vertically and horizontally relative to one side of each sector-shaped piece , with crossing each other.

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Shiga, Japan

Fumihiko Okagawa