Operation management method of reverse osmosis membrane device and reverse osmosis membrane treatment system

摘要

scale formation in the reverse osmosis membrane device is suppressed even under the low water temperature condition (water temperature 5 to 10 ° C) without the necessity of adjusting the pH or the addition of the scale dispersant, and the stable operation for a long time is continued. The operation of the reverse osmosis membrane device is managed based on the aluminum ion and / or iron ion concentration of the water feed and / or concentrated water of the reverse osmosis membrane device. In addition to silica, coexisting aluminum ions and iron ions greatly affect the flux reduction of the reverse osmosis membrane by silica scale. In order to stabilize the operation of the reverse osmosis membrane apparatus for a long period of time, it is necessary to appropriately manage the concentrations of aluminum ions and / or iron ions in the feed water and / or the concentrated water.