High-rate nitrification at low pH in suspended and attached-biomass reactors

Article Abstract:

Autotrophic nitrifying bacteria originating from a municipal wastewater treatment plant having the ability to nitrifying at low pH and at high rate even with a negligible free ammonia concentration without any special NH3 generating mechanisms is discussed. Results suggest that these bacteria have the ability to nitrify at a high rate at low pH and in the presence of only a negligible free ammonia concentration, suggesting the presence of an efficient ammonium uptake system and the means to cope with low pH.

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Occurrence of ammonia-oxidizing archaea in wastewater treatment plant bioreactors

Article Abstract:

A report on molecular evidence that ammonia-oxidizing archaea (AOA) occur in activated sludge bioreactors, used to remove ammonia from wastewater is presented. This demonstrates the presence of molecular markers for AOA, including an archaeal ammonia monooxygenase subunit A (amoA) cluster, which is widespread in activated sludge bioreactors.

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Nitrification and nitrifying bacteria in the lower Seine River and estuary (France)

Article Abstract:

The potential total nitrifying activity and the potential activities of ammonia and nitrite oxidizing communities along the Siene River are quantified. The results imply a significant immigration and selection of the ammonia- oxidizing bacterial population along the continuum of the Seine River from Paris to the estuary.

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