METHOD AND APPARATUS FOR PURIFYING WATER

摘要

A method for purifying water comprising a first step of feeding ozone-containing air into water, to perform disinfection of the water by the ozone, a second step of irradiating an ultraviolet ray of a medium wave length to the water obtained from the first step, to thereby form a hydroxy radical or a superoxide, and a third step of further irradiating an ultraviolet ray of a long wave length to the water treated in the second step; and an apparatus for the method. The second step and/or the third step are preferably carried out in the presence of orthorhombic titanium oxide particles or such titanium oxide particles carrying other fine metal particles. The method can be employed for performing rapid disinfection of water and also decomposing an organic compound being less susceptible to decomposition.