Inactivation of Mycobacterium avium with Free Chlorine
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- 作者：Jeanne Luh ; Benito J. Mariñ ; as
- 刊名：Environmental Science & Technology
- 出版年：2007
- 出版时间：July 15, 2007
- 年：2007
- 卷：41
- 期：14
- 页码：5096 - 5102
- 全文大小：412K
- 年卷期：v.41,no.14(July 15, 2007)
- ISSN：1520-5851
文摘
The inactivation kinetics of Mycobacterium avium withfree chlorine was characterized by two stages: an initialphase at a relatively fast rate followed by a slowersecond stage of pseudo first-order kinetics. The inactivationrate of each stage was approximately the same for allexperiments performed at a certain condition of pH andtemperature; however, variability was observed forthe disinfectant exposure at which the transition betweenthe two stages occurred. This variability was not afunction of the initial disinfectant concentration, the initialbacterial density, or the bacterial stock. However, thetransition to the second stage varied more significantly athigh temperatures (30 
C), while lower variability wasobserved at lower temperatures (5 and 20 C). Experimentsconducted at pH values in the range of 6-9 revealedthat the inactivation of M. avium was primarily due tohypochlorous acid, with little contribution from hypochloriteion within this pH range. The inactivation kinetics wasrepresented with a two-population model. The activationenergies for the resulting pseudo first-order rate constantsfor the populations with fast and slow kinetics were100.3 and 96.5 kJ/mol, respectively. The magnitude of thesevalues suggested that for waters of relatively high pHand low temperatures, little inactivation of M. avium wouldbe achieved within treatment plants, providing a seedingsource for distribution systems.
C), while lower variability wasobserved at lower temperatures (5 and 20 C). Experimentsconducted at pH values in the range of 6-9 revealedthat the inactivation of M. avium was primarily due tohypochlorous acid, with little contribution from hypochloriteion within this pH range. The inactivation kinetics wasrepresented with a two-population model. The activationenergies for the resulting pseudo first-order rate constantsfor the populations with fast and slow kinetics were100.3 and 96.5 kJ/mol, respectively. The magnitude of thesevalues suggested that for waters of relatively high pHand low temperatures, little inactivation of M. avium wouldbe achieved within treatment plants, providing a seedingsource for distribution systems.