Abstract
Abstract From 2006–2007, a pilot-scale ultraviolet (UV) disinfection system for the treatment of drinking water was operated in Dongguan, China. The main goal of the research was to characterize the biofilm of a model distribution system for different UV correlative disinfection processes. A biofilm annular reactor (BAR) as the model distribution system was employed. Results showed that on its own, UV disinfection could not significantly control the biofilm densities at steady state in BAR. Likewise, hydraulic retention time (HRT) did not have an impact on the coupon biofilms for both of the materials in the experiment. However, UV disinfection was considered to achieve biostability in the model distribution system with 0.7 mg/L chlorine and 0.4 mg/L chloramine after UV. The biofilm kept growing with low residual chlorine and assimilable organic carbon (AOC) level. Scanning electron microscopy (SEM) results also indicated that UV disinfection alone could not effectively control the biostability of the mod...
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