PROBLEM TO BE SOLVED: To provide a hydroponics system circulating nutrient solution while always exerting excellent purifying effect, effectively promoting growth of plants while preventing acidification of the nutrient solution due to ozone, and also having a simple plumbing so as to easily correspond to the various scales of facilities.SOLUTION: The hydroponics system circulates a culture solution W as a liquid fertilizer between a nutrient solution tank 1 in which the culture solution W is charged, and a culture bed 2. The culture solution W in the nutrient tank 1 is subjected to sterile filtration/purification in a sterile filtration/purification unit 3. The sterile filtration and purification unit 3 has an ultraviolet radiation function to irradiate the culture solution W with the ultraviolet ray, an ozone-supplying function to supply ozone to the whole of the culture solution W having parts free from irradiation with the ultraviolet ray, and a photo catalyst action function to act the photo catalyst having stronger sterilization performance and organic substance-degrading performance than those of the ozone on the culture solution W.COPYRIGHT: (C)2010,JPO&INPIT【課題】優れた浄化作用を常に発揮させながら養液を循環させて、オゾンによる養液の酸性化を防ぎながら植物の効果的な生育促進を図ることができる養液栽培システムであり、簡単な配管系統により様々な規模の設備にも容易に対応できる養液栽培システムを提供する。【解決手段】液肥である培養液Wを入れる養液タンク1と栽培ベッド2との間を循環させる養液栽培システムであって、養液タンク1内の培養液Wを除菌浄化ユニット3で除菌浄化する。除菌浄化ユニット3は、培養液Wに紫外線を照射する紫外線照射機能と、紫外線が照射されない部分を含む培養液W全体にオゾンを供給するオゾン供給機能と、オゾンよりも強い除菌能力と有機物の分解能力とを有する光触媒を培養液Wに作用させる光触媒作用機能とを有するユニットである。【選択図】 図1
