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- Title
Simulated distribution nitrification: Nitrification Index evaluation and viable AOB.
- Authors
SCHRANTZ, KAREN A.; PRESSMAN, JONATHAN G.; WAHMAN, DAVID G.
- Abstract
Lab-scale reactors were used to evaluate the impact of simultaneously increasing temporal influent monochloramine (NH2Cl) concentrations (0.0 to 3.2 mg/L Cl2) and chlorine-tonitrogen mass ratios (0:1 to 3.2:1) on nitrification, allowing evaluation of the recently proposed Nitrification Index (NI) for chloraminated drinking water distribution system operation control. Nitrification was severely affected with a 1.5 mg/L as Cl2 NH2Cl residual, becoming undetectable when the NH2Cl residual reached 3 mg/L Cl2. The calibrated NI was successful in simulating nitrification occurrence. In addition, temporal biofilm sample results demonstrated that viable ammonia-oxidizing bacteria were (1) dominated by Nitrosomonas europaea-related species for an NH2Cl residual less than approximately 0.4 mg/L Cl2, (2) dominated by N. oligotropha-related species for an NH2Cl residual between 0.4 and 1.5 mg/L Cl2, and (3) not detected once the NH2Cl residual was maintained at approximately 3 mg/L Cl2/L.
- Subjects
NITRIFICATION; CHLORINE; DRINKING water; NITROSOMONAS europaea; NITRIFYING bacteria
- Publication
Journal: American Water Works Association, 2013, Vol 105, Issue 5, p55
- ISSN
0003-150X
- Publication type
Article
- DOI
10.5942/jawwa.2013.105.0046