AWWA JAW72289

Limiting microbial growth via control of nutrients has been well studied for heterotrophic bacteria, but there are few studies on this approach for control of nitrifiers in drinking water. The objective of this study was to investigate the impact of macronutrients, trace nutrients, and pipe materials on nitrification activity under simulated premise plumbing conditions. Nitrification can vary dramatically in a distribution system, depending on the pipe materials used and the nutrients that are present. Utilities concerned about effects of nitrification should examine extremes of the distribution system, including premise plumbing systems, to characterize the full range of possible effects. Water suppliers can use the results to guide sampling and detect parts of the distribution system that are most susceptible to growth of nitrifying bacteria. Control of nitrification is a complex problem with public health implications, so this knowledge will be helpful in planning holistic and comprehensive management of distribution systems.

Includes 45 references, tables, figures.