CLOSED CIRCULATION TYPE FISH FARMING APPARATUS AND FISH FARMING METHOD

摘要

Provided are a closed circulation type fish farming apparatus and a fish farming method using the same by which equipment can be simplified and thus the equipment cost can be largely reduced compared with the existing techniques and the labor and cost for operation and maintenance can be largely reduced too. A closed circulation type fish farming apparatus comprising a rearing water tank (1), a first liquid cyclone (2) by which drainage water (B) discharged from the bottom end thereof is separated into a sludge (M) and a primary supernatant (C), a second liquid cyclone (3) by which a secondary supernatant (E) is separated from rearing water (A) drawn from the upper part of the rearing water tank (1) and the primary supernatant (C) as described above , a pair of three-way valves (85, 86) by which the secondary supernatant (E) is distributed into first to third channels (81 to 83), a membrane separation active sludge processing unit (MBR) (5) which is provided in the downstream of the second channel (82), a membrane filtration unit (6) which is provided in the downstream of the third channel (83), a conditioning tank (7) in which the processed water having been processed is stored, a back-flow channel (84) which joins together with the third channel (81) and returns the processed water in the conditioning tank (7) back to the rearing water tank (1), and an unprocessed water storage tank (4) in which the secondary supernatant (E) and so on are stored.