| abstract |
To provide a water treatment system capable of extending the life of a reverse osmosis membrane by executing a treatment for biofilm suppression even during normal operation. A reverse osmosis membrane module that separates supply water W11 into permeate water W20 and concentrated water W30, a supply water line L1 that supplies the supply water W11 toward the reverse osmosis membrane module 10, and a supply water line L1 In addition, the reverse osmosis membrane module 10 is added to the first chemical addition device 5 for adding the first chemical that has sterilizing power and ecotoxicity is not more than a predetermined value and can be used during the production of treated water, and the supply water line L1. Based on the estimated amount of biofilm, the second agent adding device 7 for adding the second agent used at the time of washing, the biofilm amount estimating unit 12 for estimating the amount of biofilm generated in the reverse osmosis membrane module 10, and A water treatment system 1 comprising: an addition amount of the first drug and a drug addition control unit 30 that controls the addition amount of the second drug. [Selection] Figure 1 |