PURPOSE:To provide the title barn so designed that a biological treatment tank constructed as an endless water channel to biologically cleaning livestock wastewater is installed under the floor of the livestock barn, thereby saving the area in the livestock business site. CONSTITUTION:A sewage purifier generally used in the OD process to biologically cleaning organic effluent is comprised of (A) an endless water channel formed by a sidewall 1 and a partition wall 3 and (B) a horizontal-shaft rotor 2, fitted at a part of the A, to feed oxygen in air to a mixture of wastewater and activated sludge and circulate said mixture along the A. Such a part of the endless water channel A as to be indicated by a plane X is unnecessary to be provided with instruments other than the wall surface constructing the water channel and covering the water channel in this part does not hamper the maintenance management, thus this upper part is covered with a floor board to be made into a bottom wall, while the upper space is made into the livestock house.
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