PROBLEM TO BE SOLVED: To efficiently generate liquid in which desired gas is dissolved at high concentration.SOLUTION: In a hydroponics apparatus, culture solution 91 is injected from a liquid injection nozzle 331 into a mixing container 32 in which air is filled, so that the air is dissolved in the culture solution 91 under a pressurized environment. Thereafter, the injection of the culture solution 91 is stopped after predetermined time or after a predetermined amount thereof is injected. The proportion of the air in the mixing container 32 is smaller than that of the normal atmosphere since the oxygen is easy to be dissolved in the culture solution 91 compared with that of nitrogen. Subsequently, the supply of the air to the inside of the mixing container 32 is started by a gas supply section 34, and the supply of the air and culture solution 91 left in the mixing container 32 are exhausted. New air is filled in the mixing container 32, so that the concentration of the oxygen in the mixing container 32 becomes that of the normal atmosphere. In the hydroponics apparatus, the culture solution 91 at a high dissolved oxygen concentration is efficiently generated by repeating the foregoing process while returning the culture solution 91 exhausted from the mixing container 32 to a liquid injection nozzle 331.COPYRIGHT: (C)2013,JPO&INPIT【課題】所望の気体が高濃度にて溶解した液体を効率良く生成する。【解決手段】水耕栽培装置では、空気が充填された混合容器32内に液体噴射ノズル331から培養液91が噴射され、加圧環境下にて培養液91に空気が溶解する。そして、所定時間後または所定量噴射後に培養液91の噴射が停止される。酸素は窒素に比べて培養液91に溶けやすいため、混合容器32内の空気は通常の大気よりも酸素の割合が少ない状態となっている。続いて、気体供給部34により混合容器32内への空気の供給が開始され、混合容器32内に残存する空気および培養液91が排出される。混合容器32内には新たな空気が充填され、混合容器32内の酸素濃度は通常の大気と同等となる。水耕栽培装置では、混合容器32から排出された培養液91を液体噴射ノズル331へと戻しつつ上述の工程が繰り返されることにより、溶存酸素濃度が高い培養液91を効率良く生成することができる。【選択図】図4
