| 摘要 |
A clustered creature exterminating method exterminating clustered creatu re such as cyanobacteria in large quantity. The clustered creature exterminatin g method of the present invention comprises the steps of: pressurizing a fluid containing a clustered creature such as cyanobacteria through a pump; suddenly lowering t he pressure applied to the fluid by injecting the fluid from nozzle groups 2a, 2b; and destroying a bonding in the clustered creature by a cavitation caused by the pressure drop. The nozzle groups 2a, 2b may be arranged so as to oppose with each oth er to collide the injected fluids with each other, which allows the cyanobacteria to be divided into many small pieces. As a result, the cyanobacteria lose the capacity to rise and sink at the bottom of water, therefore, they cannot photosynthesize to die out.
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