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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク CT Value ： ウィキペディア英語版 CT Value CT Values are an important part of calculating disinfectant dosage for the chlorination of drinking water. A CT value is the product of the concentration of a disinfectant (e.g. free chlorine) and the contact time with the water being disinfected. It is typically expressed in units of mg-min/L. The goal of disinfection is the inactivation of microorganisms. This depends on: the microorganism, the disinfectant being used, the concentration of the disinfectant, the contact time, and the temperature and pH of the water. ==Kinetics== The disinfection kinetics are conventionally calculated via the Chick-Watson model, named for the work of Harriette Chick and H.E. Watson. This model is expressed by the following equation: : $\backslash ln(\backslash frac)=\backslash Lambda\_\; C^n\; t\; \backslash !$ Where: * $(\backslash frac)\; \backslash !$ is the survival ratio for the microorganisms being killed * $\backslash Lambda\_\; \backslash !$ is the Chick-Watson coefficient of specific lethality * $C\; \backslash !$ is the concentration of the disinfectant (typically in mg/L) * $n\; \backslash !$ is the coefficient of dilution, frequently assumed to be 1〔 * $t\; \backslash !$ is the contact time (typically in minutes or seconds) The survival ratio is commonly expressed as an inactivation ratio (in %) or as the number of reductions in the order of magnitude of the microorganism concentration. For example, a situation where N0=107 CFU/L and N=104 CFU/L would be reported as a 99.9% inactivation or "3-log10" removal. In water treatment practice, tables of the product C×t are used to calculate disinfection dosages. These tables express the required CT values to achieve a desired removal of microorganisms of interest in drinking water (e.g. Giardia lamblia cysts) for a given disinfectant under constant temperature and pH conditions. A portion of such a table is reproduced below. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「CT Value」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.