WATER TREATMENT SYSTEM OPERATION METHOD AND WATER TREATMENT SYSTEM

To provide a water treatment system operation method by which raw water can be treated without addition of a sterilizer and microbial growth in a system can be suppressed, and a water treatment system.SOLUTION: A water treatment system 1 comprises a water treatment part 10 which performs one or more treatments for raw water, and a raw water supply part which supplies raw water to the water treatment part 10. The water treatment part 10 comprises a first water treatment part 11 which performs treatment of raw water in the state where metal ions are dissolved in raw water. After supply of raw water to the water treatment part 10 and treatment of raw water in the water treatment part 10, supply and treatment of raw water are stopped, treatment water and a sterilizer obtained in the water treatment part 10 are supplied to the first water treatment part 11 in the state where organic substances and the metal ions are existent in the first water treatment part 11, thereby sterilizing the first water treatment part 11.SELECTED DRAWING: Figure 1 【課題】滅菌剤を添加せずに原水を処理でき、かつシステム内での微生物の増殖を抑制できる水処理システム運転方法及び水処理システムの提供。【解決手段】水処理システム１は、原水に対し１以上の処理を行う水処理部１０と、水処理部１０への原水の供給を行う原水供給部とを備え、水処理部１０は、原水中に金属イオンが溶存した状態で原水の処理を行う第１水処理部１１を備える。水処理部１０への原水の供給及び水処理部１０での原水の処理の後、前記原水の供給及び処理を停止し、第１水処理部１１に、有機物と前記金属イオンが存在した状態で、水処理部１０で得た処理水と滅菌剤とを第１水処理部１１に供給して第１水処理部１１を滅菌処理する。【選択図】図１