Abstract
With the aim of extermination of the zooplankton which is harmful for the environment and aquaculture in some cases by hydrodynamic cavitation using an enlarged pipe, treatment efficiency was enhanced by optimizing the diameter and length of the narrow area of the enlarged pipe. In addition, effect of the downstream pressure of narrow area of the enlarged pipe was measured. From the treatment of artemia and copepod, which were a kind of zooplankton, by hydrodynamic cavitation using optimized enlarged pipe, it was shown that the zooplankton was successfully exterminated using the hydrodynamic cavitation with an enlarged pipe, and the downstream pressure of narrow area of the enlarged pipe could be enhanced the treatment efficiency.
