Activity of different groups of microorganisms in moving-bed biofilm reactor with one stage deammonfication process
2011 (English)In: Proceeding of IWA Biofilm Conference 2011: Processes in Biofilms, 2011, 112-123 p.Conference paper (Refereed)
In a moving bed biofilm reactor (MBBR) with one stage deammonification process, ammonium oxidizing bacteria (AOB) and anammox bacteria play the dominating roles for the process performance and efficiency. However, heterotrophic bacteria and nitrite oxidizing bacteria (NOB) are very hard to avoid due to the presence of small amount of organic material and nitrite. In this study, the investigations have been carried out to evaluate the activity of different groups of microorganisms in the biofilm by specific anammox activity (SAA), oxygen uptake rate (OUR) and nitrate utilisation rate (NUR) tests. The pilot plant with MBBR has been operated for 1.5 years to remove nitrogen from reject water coming after dewatering of digested sludge. Different aeration strategies, which were characterized by dissolved oxygen concentration (DO) and the ratio between non-aerated and aerated phase duration (R), were introduced into the process. The results showed that introduction of anaerobic phase and high nitrogen load could enhance the activity of anammox bacteria. Oxygen concentration in the bulk liquid in the reactor influenced the activity of AOB. It was possible to limit the NOB activity in deammonification process by providing interval anaerobic phases. Heterotrophic bacteria activity was low when limited amount of organic carbon was available.
Place, publisher, year, edition, pages
2011. 112-123 p.
aeration strategies, deammonification process, microorganisms activity, moving bed biofilm reactor (MBBR)
IdentifiersURN: urn:nbn:se:kth:diva-81609OAI: oai:DiVA.org:kth-81609DiVA: diva2:497667
IWA Biofilm Conference 2011, 27-30 October 2011, Shanghai, China
QC 201202142012-02-102012-02-102012-06-28Bibliographically approved