| 摘要 |
<p>PROBLEM TO BE SOLVED: To efficiently suppress the proliferation of microorganism in a part contacting stored water, lessen the number of facilities and apparatuses for suppressing microorganism, and heighten the selectivity of the materials for producing a water storage tank by forming a photocatalyst layer on the inner face of the tank wall of the water storage tank and installing a lighting part in the tank wall. SOLUTION: A water phase part W and a gas phase part A are formed by storing pure water (clean water) in the inside of a water storage tank main body 1 of a water storage tank X. At that time, a photocatalytic reaction is caused by a photocatalyst layer 2a by radiation of light rays (especially ultraviolet rays) by solar light through a lighting part 3 and based on the strong oxidizing function of the photocatalyst layer 1, oxygen contained in the water phase part W contacting the photocatalyst layer 2a or water dews adhering to the gas phase part A in the upper side is excited and activated oxygen is generated. By the strong oxidizing function of the activated oxygen, microorganism mixed in the water phase part W is sterilized and disinfected and its propagation is suppressed. Even by radiation of, for example, visible light rays with wavelength of 410-800 nm instead of ultraviolet rays (light rays), the performance can be observed through the effectiveness is lowered.</p> |
