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CHARACTERIZING PIPE WALL DEMAND: IMPLICATIONS FOR WATER QUALITY MODELING
Citation:
Clark, R. M. AND R C. Haught*. CHARACTERIZING PIPE WALL DEMAND: IMPLICATIONS FOR WATER QUALITY MODELING. JOURNAL OF WATER RESOURCES PLANNING AND MANAGEMENT. American Society of Civil Engineers (ASCE), Reston, VA, 131(3):208-217, (2005).
Impact/Purpose:
information
Description:
It has become generally accepted that water quality can deteriorate in a distribution system through reactions in the bulk phase and/or at the pipe wall. These reactions may be physical, chemical or microbiological in nature. Perhaps one of the most serious aspects of water quality deterioration in a network is the loss of disinfectant residual that can weaken the barrier against microbial contamination. Recent studies have suggested that one factor contributing to the loss of disinfectant residuals is internal corrosion of the pipe wall material. Recent studies have suggested that in older unlined metal pipes, the loss of chlorine residual may increase with increasing flow rates. In order to systematically study the effect of free chlorine loss in corroded metal pipes, subject to changes in velocity, the authors conducted a controlled study in a specially constructed pipe loop located at the U.S. Environmental Protection Agency's (USEPA's) Test and Evaluation (T&E) Facility in Cincinnati, Ohio. Results from the pipe loop study supported the concept that the rate of free chlorine residual loss increased with velocity.
