Preliminary Assessment of Bacterial Community Change Impacted by Chlorine Dioxide in a Water Treatment Plant

AbstractThe use of chlorine dioxide (ClO2) instead of free chlorine (Cl2) as a preoxidant is an effective option for reducing disinfection byproducts (DBPs) and enhancing coagulation in water treatment plants (WTPs). This study takes a first look at water quality and bacterial community responses within a WTP when switching preoxidants between Cl2 and ClO2. Water samples and biofilm coupons inserted in the sedimentation basin were collected during the change between ClO2 and Cl2 in a local WTP. Biofilm density and bacteria viability significantly decreased in response to the preoxidant change. Molecular methods confirmed the switch to Cl2 oxidation that decreased the diversity index for both biofilms and basin waters. Range weighted richness calculations reveal that changing the preoxidant results in a more adverse environment for bacterial growth, compared to maintaining one preoxidant over time. The insights provided regarding microbial growth and diversity under differing oxidants offer a unique perspe...

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