You are here:
CHLORINE DECAY AND BIOFILM STUDIES IN A PILOT SCALE DRINKING WATER DISTRIBUTION DEAD END PIPE SYSTEM
Citation:
Li, S., M Dosani, R. Krishnan, P. Biswas, M C. Meckes*, AND R M. Clark*. CHLORINE DECAY AND BIOFILM STUDIES IN A PILOT SCALE DRINKING WATER DISTRIBUTION DEAD END PIPE SYSTEM. Presented at AWWA Water Quality Technology Conference, Salt Lake City, UT, 11/5-9/2000.
Description:
Chlorine decay experiments using a pilot-scale water distribution dead end pipe system were conducted to define relationships between chlorine decay and environmental factors. These included flow rate, biomass concentration and biofilm density, and initial chlorine concentrations. The experimental apparatus is a prototype of dead-end distribution pipe designed and constructed at the USEPA T&E Facility. Hydraulic dispersion and chlorine decay under continuous flow conditions were examined. Tracer dispersion experiments were used to estimate the chlorine dispersion coefficients as a function of Reynolds number Re. A model fit to the experiment was used to develop hydraulic dispersion coefficients for a given Re. Chlorine decay in the pilot-scale dead-end pipe was tested under stagnant and continuous flow. For a given set of experiments, the initial chlorine concentrations were held constant at one of three levels. In stagnant water, molecular diffusion has a significant impact on residual concentations. A computer model was used to simulate chlorine decay, in which wall decay constant is estimated.