AWWA WQTC62530

This slide presentation outlines a study on nitrification occurrence in distribution systems. The problems that nitrification causes in distribution systems are outlined as related to: chloramine disinfection in distribution systems (DS), extra ammonia during chloramine formation, and ammonia release from chloramine decay; and, nitrification is not desired in chloraminated drinking water distribution systems because of nitrite production, loss of disinfectant residual, and heterotrophic plate count (HPC) increase. Topics covered include: sedimentation/filtration; common experimental observations; logistic regression; pH models tested; multiple factor model; and, risk of nitrification based on multiple factor model. Includes figures.