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Monochloramine Cometabolism by Nitrifying Biofilm Relevant to Drinking Water
Biological monochloramine removal (i.e., cometabolism) by a pure culture ammonia‐oxidizing bacteria—Nitrosomonas europaea—and a nitrifying mixed culture have recently been shown to increase monochloramine demand. Although important, these previous suspended‐culture batch kinetic experiments were not representative of drinking water distribution systems, where bacteria grow predominantly as biofilm attached to pipe walls or sediments, and physiological differences may exist between suspension and biofilm growth. The current research made an important next step in extending the previous results by investigating monochloramine cometabolism by biofilm grown in annular reactors under conditions relevant to drinking water. Estimated monochloramine cometabolism kinetics were similar to those of ammonia metabolism, and monochloramine cometabolism was a significant loss mechanism (30–40% of the observed monochloramine loss). These results demonstrate that monochloramine cometabolism occurred in nitrifying biofilm relevant to drinking water; thus, cometabolism may be a significant contribution to monochloramine loss during nitrification episodes in distribution systems.
Monochloramine Cometabolism by Nitrifying Biofilm Relevant to Drinking Water
Biological monochloramine removal (i.e., cometabolism) by a pure culture ammonia‐oxidizing bacteria—Nitrosomonas europaea—and a nitrifying mixed culture have recently been shown to increase monochloramine demand. Although important, these previous suspended‐culture batch kinetic experiments were not representative of drinking water distribution systems, where bacteria grow predominantly as biofilm attached to pipe walls or sediments, and physiological differences may exist between suspension and biofilm growth. The current research made an important next step in extending the previous results by investigating monochloramine cometabolism by biofilm grown in annular reactors under conditions relevant to drinking water. Estimated monochloramine cometabolism kinetics were similar to those of ammonia metabolism, and monochloramine cometabolism was a significant loss mechanism (30–40% of the observed monochloramine loss). These results demonstrate that monochloramine cometabolism occurred in nitrifying biofilm relevant to drinking water; thus, cometabolism may be a significant contribution to monochloramine loss during nitrification episodes in distribution systems.
Monochloramine Cometabolism by Nitrifying Biofilm Relevant to Drinking Water
Wahman, David G. (Autor:in) / Maestre, Juan P. (Autor:in) / Speitel, Gerald E. Jr. (Autor:in)
Journal ‐ American Water Works Association ; 108 ; E362-E373
01.07.2016
12 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Chlorinated solvents cometabolism by an enriched nitrifying bacterial consortium
| British Library Conference Proceedings | 2001