CONTAMINATED WATER PURIFICATION METHOD

摘要

PROBLEM TO BE SOLVED: To provide a contaminated water purification method which enables a suppression of the formation of by-products while keeping the rate of pollutants removed in decomposing and removing harmful pollutants from contaminated water by using ozone and ultraviolet rays. SOLUTION: The contaminated water purification method is provided with gas/liquid mixers 5a and 5b mixing ozone with the contaminated water, ultraviolet irradiators 6a and 6b that irradiate polluted water mixed with ozone with ultraviolet rays to decompose contaminants, and gas/liquid separation steps 7a and 7b that separate remaining gas from the contaminated water subjected to the ultraviolet irradiation. A unit comprising each gas/liquid mixer 5a or 5b and each ultraviolet irradiator 6a or 6b is repeated in a plurality of stages, and the dose of ultraviolet irradiation in relation to the ozone injection rate in each stage is increased stepwise according to the progress of treatment. COPYRIGHT: (C)2005,JPO&NCIPI