Abstract
By eutrophication of lake or marsh, a lot of blue-green algae increase explosively. Ultra-high pressure underwater shock waves were applied to treatment those algae. We used a large-sized apparatus for an experiment. The imploding detonation of propane-oxygen mixture was used to generate the underwater shock waves in underwater shock tube having inner diameter of 48.9 mm. We investigated the imploding detonation wave in approximately cone shaped combustion chamber having maximum inner diameter of 230mm and generated underwater shock waves of about 100 MPa. And we compared this result with earlier experimental result of a small-sized apparatus. We obtained same cases that the number of cells decreased about six digits from treatment before, and it was suggested that duration of underwater shock wave had an influence on algae.
