ORGANIC WASTEWATER TREATMENT APPARATUS

To provide an organic wastewater treatment apparatus using a MBR method which facilitates maintainability while reducing an installation area.SOLUTION: An organic wastewater treatment apparatus for biological treatment of nitrogen-containing organic wastewater in a treatment tank in which activated sludge is stored. The apparatus includes a partition member which divides the treatment tank in a vertical direction into an upper layer space and a lower layer space, a plurality of anoxic tanks comprising a treatment tank located in the lower layer space, a plurality of aerobic tanks equipped with an immersion-type membrane separation apparatus comprising a treatment tank located in the upper layer space, a raw water supply route for supplying organic wastewater divided into each anoxic tank, a denitrification liquid transfer route for transferring activated sludge from the anoxic tank to the aerobic tank, and a plurality of nitrification liquid transfer routes for transferring activated sludge from the aerobic tank to the anoxic tank. The activated sludge circulates throughout the treatment tank, and the transfer of activated sludge from the anoxic tank to the aerobic tank via the denitrification liquid transfer route and the transfer of activated sludge from the aerobic tank to the anoxic tank via the nitrification liquid transfer route are repeated.SELECTED DRAWING: Figure 2 【課題】設置面積を小さくしながらもメンテナンスなどの作業が容易なＭＢＲ法を用いる有機性排水処理装置を提供する。【解決手段】窒素を含む有機性排水を活性汚泥が貯留される処理槽で生物処理する有機性排水処理装置で、処理槽を上層空間と下層空間とに上下方向に区画する上下仕切り部材と、下層空間に位置する処理槽により構成された複数の無酸素槽と、上層空間に位置する処理槽により構成された浸漬型の膜分離装置を備えた複数の好気槽と、有機性排水を各無酸素槽に分割して供給する原水供給経路と、無酸素槽から好気槽へ活性汚泥を移送する脱窒液移送経路と、好気槽から無酸素槽へ活性汚泥を移送する複数の硝化液移送経路と、を備え、活性汚泥が処理槽全体を循環するように、脱窒液移送経路を介した無酸素槽から好気槽への活性汚泥の移送と、硝化液移送経路を介した好気槽から無酸素槽への活性汚泥の移送が繰り返される。【選択図】図２