| abstract |
(57) [Problem] To provide a method and an apparatus for killing alga without using any chemical substance. SOLUTION: The raw water in which the algae have multiplied is irradiated with electromagnetic waves or the raw water in which the algae have multiplied is heated to kill alga, and the raw water is purified. Raw water suction port (1), heat exchanger (3), water pipe (4) for transferring raw water in the apparatus, electromagnetic wave source (6) as algicidal means and its irradiator (5), and The algicidal device has a discharge port (7) for discharging the treated water out of the device. |