Diversity study of nitrifying bacteria in full-scale municipal wastewater treatment plants

Slil Siripong, Bruce Rittmann

Research output: Contribution to journalArticle

265 Citations (Scopus)

Abstract

We hypothesize that activated-sludge processes having stable and complete nitrification have significant and similar diversity and functional redundancy among its ammonia- and nitrite-oxidizing bacteria, despite differences in temperature, solids retention time (SRT), and other operating conditions. To evaluate this hypothesis, we examined the diversity of nitrifying bacterial communities in all seven water-reclamation plants (WRPs) operated by Metropolitan Water Reclamation District of Greater Chicago (MWRDGC). These plants vary in types of influent waste stream, plant size, water temperature, and SRT. We used terminal restriction fragment length polymorphism (T-RFLP) targeting the 16S rRNA gene and group-specific ammonia-monooxygenase functional gene (amoA) to investigate these hard-to-culture nitrifying bacteria in the full-scale WRPs. We demonstrate that nitrifying bacteria carrying out the same metabolism coexist in all WRPs studied. We found ammonia-oxidizing bacteria (AOB) belonging to the Nitrosomonas europaea/eutropha, Nitrosomonas oligotropha, Nitrosomonas communis, and Nitrosospira lineages in all plants. We also observed coexisting Nitrobacter and Nitrospira genera for nitrite-oxidizing bacteria (NOB). Among the factors that varied among the WRPs, only the seasonal temperature variation seemed to change the nitrifying community, especially the balance between Nitrosospira and Nitrosomonas, although both coexisted in winter and summer samples. The coexistence of various nitrifiers in all WRPs is evidence of functional redundancy, a feature that may help maintain the stability of the system for nitrification.

Original languageEnglish (US)
Pages (from-to)1110-1120
Number of pages11
JournalWater Research
Volume41
Issue number5
DOIs
StatePublished - Mar 2007

Fingerprint

Wastewater reclamation
nitrifying bacterium
Wastewater treatment
Bacteria
Ammonia
Nitrification
ammonia
Redundancy
water
nitrite
bacterium
Genes
nitrification
Activated sludge process
Polymorphism
gene
Cell culture
Metabolism
Temperature
wastewater treatment plant

Keywords

  • Activated sludge
  • Diversity
  • Functional redundancy
  • Nitrifiers
  • T-RFLP

ASJC Scopus subject areas

  • Earth-Surface Processes

Cite this

Diversity study of nitrifying bacteria in full-scale municipal wastewater treatment plants. / Siripong, Slil; Rittmann, Bruce.

In: Water Research, Vol. 41, No. 5, 03.2007, p. 1110-1120.

Research output: Contribution to journalArticle

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