PROBLEM TO BE SOLVED: To reduce saprophytes in drain water.SOLUTION: A cultivation device (1) has a sterilization device (33) that gives a component having sterilization action to drain water recovered from an air conditioning device (35), and makes drain water circulate between a drain water tank (32) and the air conditioning device (35) through piping between the drain water tank (32) and the air conditioning device (35).SELECTED DRAWING: Figure 1COPYRIGHT: (C)2017,JPO&INPIT【課題】ドレン水中の雑菌を減少させる。【解決手段】栽培装置(1)は、空調装置(35)から回収されたドレン水に殺菌作用を有する成分を付与する殺菌装置(33)を備え、ドレン水タンク(32)と空調装置(35)との間の配管を通じて、ドレン水タンク(32)と空調装置(35)との間にてドレン水を循環させる。【選択図】図1
