On the cause of the tailing phenomenon during virus disinfection by chlorine dioxide

WATER RESEARCH

卷:48

Article

Sigstam, Therese¹  Rohatschek, Andreas¹  Zhong, Qingxia¹  Brennecke, Moritz¹  Kohn, Tamar¹ 

[1] Ecole Polytech Fed Lausanne, Environm Chem Lab, Sch Architecture Civil & Environm Engn ENAC, CH-1015 Lausanne, Switzerland

关键词: Chlorine dioxide;    Viruses;    Tailing;    Reversible protection;    MALDI;    Resistant subpopulation;   

DOI  :  10.1016/j.watres.2013.09.023

来源: Elsevier

【 摘 要 】

This study investigates the mechanisms underlying the deviation from Chick-Watson kinetics, namely a tailing curve, during the disinfection of viruses by chlorine dioxide (ClO2). Tailing has been previously reported, but is typically attributed to the decay in disinfectant concentration. Herein, it is shown that tailing occurs even at constant ClO2 concentrations. Four working hypothesis to explain the cause of tailing were tested, specifically changes in the solution's disinfecting capacity, aggregation of viruses, resistant virus subpopulations, and changes in the virus properties during disinfection. In experiments using MS2 as a model virus, it was possible to rule out the solution's disinfecting capacity, virus aggregation and the resistant subpopulation as reasons for tailing. Instead, the cause for tailing is the deposition of an adduct onto the virus capsid over the course of the experiment, which protects the viruses. This adduct could easily be removed by washing, which restored the susceptibility of the viruses to ClO2. This finding highlights an important shortcoming of ClO2, namely its self-limiting effect on virus disinfection. It is important to take this effect into account in treatment applications to ensure that the water is sufficiently disinfected before human consumption. (C) 2013 Elsevier Ltd. All rights reserved.

【 授权许可】

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