PUZZLED BY LEGIONELLA? LESSONS LEARNED FROM RECOMMISSIONING AFTER EXTENDED STAGNATION FOR LEGIONELLA CONTROL
Wednesday, April 14 @ noon ET
The COVID19 pandemic prompted the closure of a staggering number of buildings causing extended stagnation in building water systems that were unoccupied or partially occupied. Because of the concerns of the potential water quality losses during these prolonged stagnation periods, a flurry of guidance and regulations were Issued in 2020. These guidance, focusing mainly on Legionella and lead, prompted building managers to conduct preventative and corrective procedures to restore water quality before reoccupation. Most guidance recommended extensive and regular flushing and, If justified, shock disinfection. Dr. Prevost will first present the results of several recommissioning case studies showing that not all buildings are contaminated with Legionella after extended stagnation and that other OPPs should be considered. Then she will show findings from a detailed intervention study to measure the impact of dally, weekly and monthly flushing and shook chlorination on the prevalence and concentrations on Legionella pneumophilia in a heavily contaminated large building.
Michele Prevost, PhD
Professor and Principal Chairholder, NSERC Industrial Chair on Drinking Water
Civil, Geological and Mining Engineering, Polytechnique Montreal
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