Lee JH  Jung JY  Park YB  Bae JH  Woo DS  Sin HD

Vol. 16,  No. 3, pp. 162-171, Sep.  2010

화학 세정제 산화철 옥내급수관 유기산

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The objective of this study is to develop cleaning agents for the indoor water supply pipe which is environmentally friendly and suitable for removing scale by using various organic acids, inorganic acids, and some additives. Among various organic acids, oxalic acid, citric acid, and malic acid showed good cleaning efficiency of iron oxides which were main components of the indoor water supply pipe scale. Several cleaning agents were formulated by adding chemical additives into these organic acids and evaluated for removal of iron oxides. In this study, it was found that nonionic surfactants were excellent for the removal of iron oxide scale among various additives. Two types of cleaning agents(F1, F2) with comparatively high solvent power for iron oxides were formulated in this study. The cleaning agents F1 made by organic acids and some additives were formulated to be safe and environmentally friendly, but seemed to have disadvantage due to their comparatively low cleaning efficiency of iron oxide than F2. But, the cleaning agents F2 prepared by adding inorganic acid a little to F1 showed comparatively good cleaning efficiency of iron oxide and could be recommended for removing hard scale of iron oxides in the indoor water supply pipe. Thus, it is considered that the formulated cleaning agents should be selected based on the extent of scale in the indoor water supply pipe.