CONTROL METHOD OF OZONE SUPPLY IN WATER TREATMENT USING OZONE OXIDATION AND MEMBRANE FILTRATION

摘要

PROBLEM TO BE SOLVED: To provide a control method of ozone supply in water treatment using ozone oxidation and membrane filtration which can realize stable water treatment with a required minimum amount of injected ozone without the deterioration of filtration performance and reduce the running cost.;SOLUTION: In water treatment where one cycle comprises membrane filtration treatment after the ozone treatment of water to be treated and washing of a filtration membrane performed at every prescribed membrane filtration treatment time, dissolved ozone in water treated by membrane filtration is measured at every prescribed time after starting the membrane filtration treatment in the above one cycle, an increase/decrease amount of ozone supply at every prescribed time after starting the membrane filtration treatment in the next cycle is preset based on a difference between the above measured value and the predetermined target value of dissolved ozone, and the amount of ozone supply at every prescribed time after starting the membrane filtration treatment in the next cycle is controlled to the value corrected by the above increase/decrease amount.;COPYRIGHT: (C)2004,JPO