PROBLEM TO BE SOLVED: To provide an acidic water that is produced when deodorizing an odor containing a sulfur compound, with Acidithiobacillus, in a biological deodorization device using microorganisms, wherein the acidic water prevents a precipitate from occurring with time, and can be used suitably for deodorant, cleaning, rust removal and the like.SOLUTION: The present invention provides an acidic water in which: a number of moles of sulfuric acid ions is 70% or more of a total number of moles of anions contained herein a pH is less than 3.0 and an oxidation-reduction potential is 450 mV or less. The acidic water contains a surfactant of 0.3 mass% or more.SELECTED DRAWING: NoneCOPYRIGHT: (C)2018,JPO&INPIT【課題】微生物を用いた生物脱臭装置にて硫黄化合物を含む臭気を硫黄酸化細菌にて脱臭処理する際に製造される、経時的な沈殿物が発生せず、消臭、洗浄、サビ落とし等に好適に利用できる酸性水の提供。【解決手段】硫酸イオンのモル数が、含有するアニオンの総モル数の70%以上であり、pHが3.0未満であり、かつ酸化還元電位が450mV以下である酸性水であって、界面活性剤を0.3質量%以上含有する酸性水。【選択図】なし
