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Simulated distribution nitrification: Nitrification Index evaluation and viable AOB
Author(s) -
Schrantz Karen A.,
Pressman Jonathan G.,
Wahman David G.
Publication year - 2013
Publication title -
journal ‐ american water works association
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.466
H-Index - 74
eISSN - 1551-8833
pISSN - 0003-150X
DOI - 10.5942/jawwa.2013.105.0046
Subject(s) - nitrification , chloramine , chemistry , environmental chemistry , ammonia , nitrosomonas , nitrogen , chlorine , biochemistry , organic chemistry
Lab‐scale reactors were used to evaluate the impact of simultaneously increasing temporal influent monochloramine (NH 2 Cl) concentrations (0.0 to 3.2 mg/L Cl 2 ) 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 Cl 2 NH 2 Cl residual, becoming undetectable when the NH 2 Cl residual reached 3 mg/L Cl 2 . 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 NH 2 Cl residual less than approximately 0.4 mg/L Cl 2 , (2) dominated by N. oligotropha ‐related species for an NH 2 Cl residual between 0.4 and 1.5 mg/L Cl 2 , and (3) not detected once the NH 2 Cl residual was maintained at approximately 3 mg/L Cl 2 .