REARING WATER CIRCULATION SYSTEM FOR CLOSED CIRCULATION TYPE REARING

摘要

PROBLEM TO BE SOLVED: To provide a simple, compact, and low-cost purification system of rearing water for a closed circulation type rearing capable of solving the problems, due to purification efficiency improvement, such as complicated apparatus structure, and increased costs of equipment, operation, and cleaning.SOLUTION: A purification system of rearing water for a closed circulation type rearing, comprises: particle fluidization type filter tanks 9 and 10 filled with nitrification particles and denitrifying bacteria-supported particles; a liquid film type gas dissolving device 8; and a re-aeration tank 11. The system enhances purification efficiency of the rearing water, and an oxygen dissolution speed. Downsizing of a filter device and decreasing of the amount of circulating treated water reduce a required area for the apparatus, a required operation energy, and a cleaning cost.