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Apparatus for destroying microorganisms by irradiation with ultra-violet light from a UV-lamp in a major irradiation chamber. The major chamber is divided into minor chambers by means of partition walls. The walls are provided with through-flow openings at their alternate ends whereby the bacteria-c

Apparatus for destroying microorganisms by irradiation with ultra-violet light from a UV-lamp in a major irradiation chamber. The major chamber is divided into minor chambers by means of partition walls. The walls are provided with through-flow openings at their alternate ends whereby the bacteria-carrying medium is conducted reciprocatingly along the UV-lamp and thereby subjected to intensive radiation therefrom over a relatively long period of time.

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Apparatus for destroying microorganisms in a bacteria-containing medium, by treating said medium with bacteria-destroying ultra-violet radiation, in which the medium is passed from an inlet (11) in an irradiation chamber (1), past a UV-lamp (5), which is preferably protected by a quartz-crystal glas

Apparatus for destroying microorganisms in a bacteria-containing medium, by treating said medium with bacteria-destroying ultra-violet radiation, in which the medium is passed from an inlet (11) in an irradiation chamber (1), past a UV-lamp (5), which is preferably protected by a quartz-crystal glass tube (4), to an outlet (12), characterized in that a major irradiation chamber (1) is divided into a plurality of mutually co-acting minor chambers (A, B, C, D and E) so arranged in the lengthwise direction along the length of said UV-lamp so that during its passage through the major chamber (1), the through-flowing medium is caused to travel reciprocatingly along the UV-lamp (5) in a manner to subject the bacteria-carrying medium to a relatively long and intensive period of radiation from the UV-lamp (5), and in that the respective walls (6-9) between the mutually co-acting minor chambers (A, B, C, D and E) are alternatively provided with upper and lower connection openings (14,15) located in the radially innermost part of said walls nearest the UV-lamp (5), such that during the course of its reciprocating movement said through-flowing medium is forced to flow along the UV-lamp (5) and is also transported therearound.