Importance

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Abstract

Rotating biological contactor-type sewage treatment equipment of the present invention comprises a treatment tank 4 for storing sewage to be treated, a rotation shaft 3 which extends across opposed side walls 4a, 4b of the treatment tank 4, a plurality of rotating discs 1 mounted at a predetermined interval on the rotation shaft 3 in such a manner that each disc is partly submerged in the sewage stored in the treatment tank 4, and a driving means for supplying a driving force to the rotation shaft 3 in order to rotate the rotating discs 1. This equipment treats sewage by rotating the rotating discs 1 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 1 is composed of n portions of sector-shaped segments 11, wherein n is an integer not less than 1, and each of the sector-shaped segments 11 is composed of two equally divided sector-shaped pieces 11a, 11b. Each of the sector-shaped pieces 11a, 11b has thin elements 19a, 19b which form square grid-like meshes 191 of the same size, except in the neighborhood of a periphery surrounding each sector-shaped piece 11a, 11b; and the thin elements 19a, 19b extend vertically and horizontally relative to one side of each sector-shaped piece 11a, 11b, with crossing each other.

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First Claim