Method for operating reverse osmosis membrane filtration plant, and reverse osmosis membrane filtration plant

摘要

An object of the present invention is to provide a method for operating a reverse osmosis membrane filtration plant which enables operations including addition of bactericide, chemical cleaning, pre-treatment, and the like which are carried out for the purpose of preventing biofouling of a reverse osmosis membrane module of a reverse osmosis membrane filtration unit highly reliably, highly sensitively, rationally, rapidly and conveniently in a reverse osmosis membrane filtration plant, and the reverse osmosis membrane filtration plant. For this objection, the present invention provides a method for operating a reverse osmosis membrane filtration plant having a raw water intake unit, a pre-treatment unit, and a reverse osmosis membrane filtration unit having a reverse osmosis membrane module in this order, the method including: disposing a biofilm formation base material under conditions that reverse osmosis membrane supply water and/or reverse osmosis membrane non-permeated water in the reverse osmosis membrane filtration unit are/is flowed at a linear speed equal to a non-permeated water linear speed in the reverse osmosis membrane module of the reverse osmosis membrane filtration unit; evaluating a biofilm amount on the biofilm formation base material at a frequency of from once a day to once in six months; and controlling the method for operating a reverse osmosis membrane filtration plant based on results of the evaluation. Particularly, as the biofilm formation base material, a reverse osmosis membrane used in the reverse osmosis membrane filtration plant is used.