A method of operating membrane filtration plant reverse osmosis membrane filtration plant reverse osmosis

A method of operating a filtration plant with reverse osmosis membrane having an input unit of raw water, a unit of pre-treatment and a filtration unit with reverse osmosis membrane having a modulus of reverse osmosis membrane in this order, said method comprising: providing a reverse osmosis membrane used as base material of biofilm formation in a flow container, wherein the reverse osmosis membrane is a rectangular sheet and is wound so that a surface layer with separation function serves inner side and the reverse osmosis membrane wrapped is pushed into the flow container along an inner wall of the flow container in which the inner side is the side on which water circulates evaluation flow within the vessel so that the water supply module reverse osmosis membrane sampled branch Pipeline to upstream of the first module reverse osmosis membrane in the filtration with the reverse osmosis membrane and / or water is not permeated by the membrane module of reverse osmosis sampled branch pipe downstream of the membrane modules reverse osmosis through which water passes not permeated by the membrane module of reverse osmosis, circulating / n on a surface of a functional layer separation sheet reverse osmosis membrane used as a base material forming housed in the flow container, and so that the water supply module reverse osmosis membrane and / or water is not permeated by the membrane module of reverse osmosis is / are filtered (s) by the sheet biofilm reverse osmosis membrane used as base material biofilm formation housed in the flow container, but in conditions where the water supply membrane module osmosi s reverse and / or water is not permeated by the membrane module of reverse osmosis circulates (n) at a linear speed equal to a linear velocity of water does not permeate the membrane module reverse osmosis unit membrane filtration reverse and equal to an average linear velocity on the surface of module reverse osmosis membrane on which water circulates not permeated osmosis; evaluating a biofilm amount on the sheet reverse osmosis membrane used as base material biofilm formation housed in the flow container at a frequency of once a day to once every six months; and controlling method of operating a filtration plant with reverse osmosis membrane based on the evaluation results, in which the reverse osmosis membrane used as base material of biofilm formation is made of the same material as membrane reverse osmosis used filtration plant with reverse osmosis membrane.