SEPARATION TREATMENT METHOD OF TREATMENT OBJECT FLUID

PROBLEM TO BE SOLVED: To provide a separation treatment method of a treatment object fluid capable of effectively restraining fouling (membrane blocking-up) of a separation membrane, and capable of enhancing separation treatment efficiency of the treatment object fluid.SOLUTION: A separation treatment method of a treatment object fluid uses a separation membrane structure 11 having a porous columnar base material 21, a plurality of cells 32 formed by penetrating in the axial direction through the base material 21 and a separation membrane 22 provided on an inner wall surface 321 of the cells 32. In the respective cells 32 of the separation membrane structure 11, a flow passage 33 for circulating the treatment object fluid A is formed on the inside of the separation membrane 22. A flow passage diameter of the flow passage 33 is 1.5 mm or less. When executing separation treatment of the treatment object fluid A, the treatment object fluid A is circulated in the flow passage 33 of the separation membrane structure 11 under a condition of film surface linear velocity of 6 m/s or more.SELECTED DRAWING: Figure 1 【課題】分離膜のファウリング（膜閉塞）を効果的に抑制でき、被処理流体の分離処理効率を高めることができる被処理流体の分離処理方法を提供すること。【解決手段】被処理流体の分離処理方法は、多孔質である柱状の基材２１と、基材２１を軸方向に貫通して形成された複数のセル３２と、セル３２の内壁面３２１に設けられた分離膜２２と、を備えた分離膜構造体１１を用いる。分離膜構造体１１の各セル３２において、分離膜２２の内側には、被処理流体Ａを流通させる流路３３が形成されている。流路３３の流路径は、１．５ｍｍ以下である。被処理流体Ａの分離処理を行う際、分離膜構造体１１の流路３３内に、膜面線速６ｍ／ｓ以上の条件で被処理流体Ａを流通させる。【選択図】図１