Biofilm Growth in a Drinking Water Network: A Preliminary Industrial Pilot-Plant Experiment

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Abstract
Bacterial populations (measured as total, actively respiring and plate count) were analysed during drinking water transport within an industrial network pilot plant comprised of six loops serially disposed. PVC and cement coupons were exposed to the water flow using special sampling devices. In the absence of any residual chlorine, bacterial growth was rapid (doubling time 10 h) during the first 40 hours. Beyond that period plateau a stationary and even a decline phase may be observed. Fixed biomass is around 107 bacteria per square centimeter and decreased constantly with the distance from the feed point of the network. Substrate conversion really controls biofilm formation.

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