2020 年 62 巻 200 号 p. 116-123
Underwater shock wave, generated by the imploding detonation of propane-oxygen mixture, was applied for sterilization and extinction processing of microorganisms. We filled the water containing microorganisms into a stainless steel pipes having inner diameter of 10.9 mm, 49 mm and 60 mm, and transmitted the underwater shock waves which have the maximum pressure of about 100MPa. As microorganisms of the treatment experiments, Coliform group, Microcystis species, Artemia salina and Heterosigma akashiwo were used. We found that the case of 2 shots of the underwater shock wave for Coliform group can sterilize about two digits compared with initial counts and the case of 6 shots of the underwater shock wave can sterilize completely. We found that the mortality rate of Microcystis species increases gradually with the increase in the number of times of shock processing. Although the maximum mortality rate of Microcystis species was 99.9% in one day after processing, it turned out that it becomes 100% in one week after processing. The mortality rate became small when the value of the consistency of Microcystis species was large. We found that we can completely kill Artemia salina by 5 shots and Heterosigma akashiwo by 1 shot of the underwater shock wave.
