METHOD FOR TREATING WATER AND ITS APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide a water treating apparatus containing an ozone treating device and a membrane filtering device, which can treat water stably with minimum clogging of the membrane without increasing the injection amount of ozone even for an increase in turbidity of raw water. SOLUTION: The apparatus is characterized in that there are provided a device (4) obtaining a turbidity-removed raw water by reducing the turbidity of the raw water, a membrane filtering device (10) obtaining a membrane- filtration raw water from the above turbidity-removed raw water and an ozone injection device (17) injecting ozone to some of the above membrane-filtration raw water to obtain an ozone-treated raw water, and a means (21) supplying the above ozone-treated water to the filtrated water side of the above membrane-filtering device.