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Simulated distribution nitrification: Nitrification Index evaluation and viable AOB
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‐to‐nitrogen 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.
Simulated distribution nitrification: Nitrification Index evaluation and viable AOB
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‐to‐nitrogen 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.
Simulated distribution nitrification: Nitrification Index evaluation and viable AOB
Schrantz, Karen A. (author) / Pressman, Jonathan G. (author) / Wahman, David G. (author)
Journal ‐ American Water Works Association ; 105 ; E242-E254
2013-05-01
13 pages
Article (Journal)
Electronic Resource
English
| British Library Conference Proceedings | 1996
| British Library Conference Proceedings | 1997
Nitrification in a Distribution System
| Wiley | 1993
Evaluation of nitrification in streams
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