Abstract: A liquid separation device is provided, and is capable of suppressing the lowering of filtration function due to an increase in flow channel resistance of permeated liquid which results in a separation membrane falling in a groove of a permeated liquid flow channel material along with accompanied breakage of the separation membrane surface. A permeated liquid flow channel material is disposed on the back side of a separation membrane composed of a sheet-like material having a linear groove and a linear crest alternately arrayed on one surface or both surfaces, wherein a groove width of the linear groove in the sheet-like material is 10 to 200 ?m, and a ratio of the groove width of the linear groove to the pitch of the linear groove is 0.45 or more.

Abstract: A fluid separation element is provided including: a membrane winding having two ends and obtained by layering a separation membrane, a feed water channel material, and a permeate channel material and spirally winding them; and one or more anti-telescoping devices attached to one or both of the ends of the membrane winding, wherein a brine seal fitting groove is provided in an outer circumferential surface of the anti-telescoping device and a hole that communicates with a feed water channel side is provided inside the groove. When the anti-telescoping devices are attached to the both ends of the membrane winding, a brine seal is fitted into the groove of the upstream-side anti-telescoping device and no brine seal is fitted into the groove of the downstream-side anti-telescoping device.

Abstract: A fluid separation element is provided including: a membrane winding having two ends and obtained by layering a separation membrane, a feed water channel material, and a permeate channel material and spirally winding them; and one or more anti-telescoping devices attached to one or both of the ends of the membrane winding, wherein a brine seal fitting groove is provided in an outer circumferential surface of the anti-telescoping device and a hole that communicates with a feed water channel side is provided inside the groove. When the anti-telescoping devices are attached to the both ends of the membrane winding, a brine seal is fitted into the groove of the upstream-side anti-telescoping device and no brine seal is fitted into the groove of the downstream-side anti-telescoping device.

Abstract: A liquid separation device is provided, and is capable of suppressing the lowering of filtration function due to an increase in flow channel resistance of permeated liquid which results in a separation membrane falling in a groove of a permeated liquid flow channel material along with accompanied breakage of the separation membrane surface. A permeated liquid flow channel material is disposed on the back side of a separation membrane composed of a sheet-like material having a linear groove and a linear crest alternately arrayed on one surface or both surfaces, wherein a groove width of the linear groove in the sheet-like material is 10 to 200 ?m, and a ratio of the groove width of the linear groove to the pitch of the linear groove is 0.45 or more.