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Göteborgs universitets publikationer

Dynamics of specific ammonia-oxidizing bacterial populations and nitrification in response to controlled shifts of ammonium concentrations in wastewater.

Författare och institution:
Robert Almstrand (Institutionen för kemi och molekylärbiologi); Pär Lydmark (Institutionen för kemi och molekylärbiologi); P-E Lindgren (-); Fred Sörensson (Institutionen för kemi och molekylärbiologi); Malte Hermansson (Institutionen för kemi och molekylärbiologi)
Publicerad i:
Applied microbiology and biotechnology, 97 ( 5 ) s. 2183-2191
Artikel, refereegranskad vetenskaplig
Sammanfattning (abstract):
Ammonia-oxidizing bacteria (AOB) are essential for the nitrification process in wastewater treatment. To retain these slow-growing bacteria in wastewater treatment plants (WWTPs), they are often grown as biofilms, e.g., on nitrifying trickling filters (NTFs) or on carriers in moving bed biofilm reactors (MBBRs). On NTFs, a decreasing ammonium gradient is formed because of the AOB activity, resulting in low ammonium concentrations at the bottom and reduced biomass with depth. To optimize the NTF process, different ammonium feed strategies may be designed. This, however, requires knowledge about AOB population dynamics. Using fluorescence in situ hybridization (FISH) and confocal laser scanning microscopy, we followed biomass changes during 6 months, of three AOB populations on biofilm carriers. These were immersed in aerated MBBR tanks in a pilot plant receiving full-scale wastewater. Tanks were arranged in series, forming a wastewater ammonium gradient mimicking an NTF ammonium gradient. The biomass of one of the dominating Nitrosomonas oligotropha-like populations increased after an ammonium upshift, reaching levels comparable to the high ammonium control in 28 days, whereas a Nitrosomonas europaea-like population increased relatively slowly. The MBBR results, together with competition studies in NTF systems fed with wastewater under controlled ammonium regimes, suggest a differentiation between the two N. oligotropha populations, which may be important for WWTP nitrification.
Ämne (baseras på Högskoleverkets indelning av forskningsämnen):
Biologiska vetenskaper ->
Ammonia-oxidizing bacteria, Nitrification, Nitrosomonas europaea, Nitrosomonas oligotropha, Wastewater treatment plant, Biofilm, FISH
Postens nummer:
Posten skapad:
2013-01-08 09:00
Posten ändrad:
2013-03-19 13:58

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