PURPOSE: To collect and separate minute oceanic life such as larva of a shellfish from seawater without exerting adverse effect on said life or generating environmental contamination, by constituting the material quality of a separation element of an alloy repelling the oceanic life.
CONSTITUTION: Raw seawater 25, from which impurities are eliminated through a sand sedimentation basin, a bar screen and a rotary screen,l is pumped up by a pump 26 and passes through an introducing pipe 28 in the direction show by an arrow 29 by opening a valve 27 to be introduced into a separation chamber 23. The larvae of the shellfish in the raw seawater are separated and collected on the surface of the separation elements 20, which are constituted of an alloy repelling ocean life, for example, based on copper and nickel, of a filter apparatus 5. As this separation filtering operation advances, the larvae are accumulated on the surfaces of the separation elements 20, and filtering resistance becomes large and, when the pressure in the separation chamber 23 reaches a set pressure or after a definite time is elapsed, valves 27, 30 are closed to perform the backwashing operation of the larvae collected on the surfaces of the separation elements 20.
| JPH03224606 | FILTER DEVICE |
| JP4868373 | Household circulation bath |
| JP2539978 | CLOSING VALVE FOR CONNECTING DOUBLE STRUCTURE FILTER CONTAINER |
SHIMADA KENJI
YAMAGUCHI TOSHIAKI
| JPS5920811B2 | 1984-05-15 |