Membrane separation system and membrane module cleaning method of membrane separation system

摘要

To provide a membrane separation system capable of substantially uniformly cleaning a plurality of membrane modules connected in parallel.SOLUTION: A membrane separation system 1 in which a plurality of membrane modules 2a to 2j are connected in parallel, comprises a to-be-treated liquid supply header pipe 14, a liquid to be treated supply pipe 15, a permeate liquid header pipe 16 and a permeated liquid takeout branch A flushing fluid supply header pipe 18 and a flushing fluid supply branch pipe 19. The backwashing fluid D is flowed from the secondary side 9 of the membrane modules 2a to 2j to the primary side 7 and subjected to back pressure washing Is connected to the permeate header pipe 16 and the flushing fluid supply means 22 for supplying the flushing fluid C into the flushing fluid supply header pipe 18 is connected to the flushing fluid supply header pipe 18 And the discharge path 48 of the washing waste liquid E discharged from the membrane modules 2 a to 2 j at the time of cleaning is connected to the other end 14 b of the liquid supply header pipe 14 to be treated(FIG.