CLOSED CIRCULATION FILTRATION AQUACULTURE SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a closed circulation filtration aquaculture system that can sufficiently supply oxygen gas necessary for nitrification in a biological filtration device.;SOLUTION: A closed circulation filtration aquaculture system is provided by arranging a breeding aquarium for breeding fish and shellfish, a gas-liquid mixed water generation device for generating gas-liquid mixed water obtained by mixing oxygen gas in the breeding water, and a biological filtration device for performing biological filtration processing of the breeding water discharged from the breeding aquarium, in a circulation flow path for circulating the breeding water. The gas-liquid mixed water generation device comprises a mixing unit for forming the oxygen gas into bubbles of a nano-level to be mixed in the breeding water. The mixing unit has an inflow port and an outflow port, and the oxygen gas and the breeding water as a fluid are made to flow from an inflow port side toward an outflow port side while meandering, and thereby it is constituted so that the gas-liquid mixed water may be generated. Also, the width of the inflow port of the direction perpendicular to the flow direction of the fluid is formed wider than the width of the flow direction of the fluid.;SELECTED DRAWING: Figure 15;COPYRIGHT: (C)2018,JPO&INPIT