Citation:

Szabo, Jeff, G. Meiners, L. Heckman, Gene Rice, AND J. Hall. Decontamination of Bacillus spores adhered to iron and cement-mortar drinking water infrastructure in a model system using disinfectants. JOURNAL OF ENVIRONMENTAL MANAGEMENT. Elsevier Science Ltd, New York, NY, , 1-12, (2017). https://doi.org/10.1016/j.jenvman.2016.11.024

Impact/Purpose:

Bacillus spores are persistent on common drinking water infrastructure surfaces such as corroded iron and cement-mortar. Due to their resistance to disinfection, inactivation of spores can be used as a benchmark for decontamination of biological agents from drinking water infrastructure following intentional or unintentional contamination. The goal of this study was to present data on spore decontamination from water infrastructure, in a pilot-scale experimental system that simulates real word drinking water infrastructure surfaces. The study examined the effectiveness of decontaminating Bacillus globigii spores, attached to corroded iron and cement-mortar coupons with free chlorine, monochloramine, chlorine dioxide, ozone, peracetic acid (PAA) and acidified nitrite, followed by flushing. The data shows that followed by flushing, free chlorine, monochloramine, ozone and chlorine dioxide can reduce adhered spores by > 3.0 log10 on cement-mortar. These data will help individuals such as incident commanders and drinking water utility personnel make informed decisions about how to decontaminate a drinking water distribution system after a biological contamination incident.

Description:

Bacillus spores are persistent on common drinking water infrastructure surfaces such as corroded iron and cement-mortar. Due to their resistance to disinfection, inactivation of spores can be used as a benchmark for decontamination of biological agents from drinking water infrastructure following intentional or unintentional contamination. The goal of this study was to present data on spore decontamination from water infrastructure, in a pilot-scale experimental system that simulates real word drinking water infrastructure surfaces. The study examined the effectiveness of decontaminating Bacillus globigii spores, attached to corroded iron and cement-mortar coupons with free chlorine, monochloramine, chlorine dioxide, ozone, peracetic acid (PAA) and acidified nitrite, followed by flushing. The data shows that followed by flushing, free chlorine, monochloramine, ozone and chlorine dioxide can reduce adhered spores by > 3.0 log10 on cement-mortar. These data will help individuals such as incident commanders and drinking water utility personnel make informed decisions about how to decontaminate a drinking water distribution system after a biological contamination incident.

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