AEROBIC BIOLOGICAL TREATMENT TANK

摘要

PROBLEM TO BE SOLVED: To obtain an aerobic biological treatment tank which eliminates such a state wherein some underwater agitation type aerators are not supplied with aeration air even in small air flow aeration and which can approximately uniformize the amount of aeration air sent into individual underwater agitation type aerators.

SOLUTION: A plurality of underwater agitation type aerators 21 having U-shaped air introducing tube sections 31 are installed in a tank. The plurality of underwater agitation type aerators 21 are individually supplied with aeration air by introducing the aeration air from the same air supply source into respective U-shaped air introducing tube sections 31 to biologically treat water to be treated. In this aerobic biological treatment tank, an air feeding amount uniformizing tube 40 which branches from a horizontal portion of the U-shaped air introducing tube section 31 and extends downward and which makes water to be treated enter the tube from a tube end is installed at the U-shaped air introducing tube section 31.

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