PROBLEM TO BE SOLVED: To provide an antifouling process in which an active halogen composition that is stable during the storage over a long period of time and that is efficient when used as a biocide, is utilized.SOLUTION: Provided are: a process in which biofouling in an aqueous liquid or on a surface in contact with an aqueous solution in industrial or agricultural equipment is removed or prevented by utilizing a stable aqueous solution comprising a mixture between active halogen and urea or derivative thereof a process in which the urea/halogen mole ratio in the mixture is at least 1/1, and pH of the aqueous composition is in acidic and a process for removing or preventing biofouling, in which the halogen source comprises an active bromine source or an active chlorine source selected from Br2BrCl, Cl2, and a halogenated alkyl hydantoin selected from BC-DMH, DB-DMH, or the like, as well as a mixture between a bromide or HBr and an oxidizer.SELECTED DRAWING: NoneCOPYRIGHT: (C)2016,JPO&INPIT【課題】長期にわたる保管で安定であり、かつ殺生物剤として用いられた場合に効率的である活性ハロゲン組成物を利用する防汚方法を提供すること。【解決手段】活性ハロゲンと尿素またはその誘導体との混合物を含む安定な水溶液を利用して、産業用および農業用機器の、水性液体中のまたは水性溶液と接する表面上の生物付着を除去するまたは防止するプロセス。前記混合物の尿素/ハロゲンのモル比が少なくとも1/1であり、水性組成物のpHが酸性であるプロセス。前記ハロゲン源がBr2BrCl、Cl2及びBC-DMH、DB-DMH等から選択されるハロゲン化アルキルヒダントイン並びに臭化物又はHBrを酸化剤との混合物から選択される活性臭素源或いは活性塩素源を含む生物付着を除去又は防止するプロセス。【選択図】なし
