| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a sheet membrane type filtration membrane element, enabling bulk treatment by increasing a treatment amount per the unit membrane area of the sheet membrane type filtration membrane element that cannot make a membrane area per the unit volume large compared with a hollow fiber membrane type filtration membrane element. SOLUTION: In this sheet membrane type filtration membrane element, flow passage materials are installed on both sides of a support plate, and a fluid separating membrane for removing impurities in the liquid is arranged on the flow passage material. The fluid separating membrane has a flow pure water permeability coefficient of 5×10-9 m3/m2.Pa.s or more. When a permeate flows between the support plate mounted with the flow passage materials and the fluid separating membrane in the direction of a permeate discharging port, the flow passage material to be used has a coefficient (b) of b0<=b<=1.2b0, wherein (b) is defined by the formula,ΔP=10bu.L and (b0) by the formula, b0=log10(48η/d2) (wherein, (u) is a flow rate per the unit sectional area of the permeate flow passage (m/s);ΔP is a pressure loss (Pa); L is a length in the direction of a permeate discharging port (m);ηis viscosity (m.Pa.s); and (d) is a diameter of the permeate flow passage).</p> |
