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Rapid start-up of nitrifying MBBRs at low temperatures: nitrification,biofilm response and microbiome analysis
Authors:Young  Bradley  Delatolla  Robert  Abujamel  Turki  Kennedy  Kevin  Laflamme  Edith  Stintzi  Alain
Institution:1.Department of Civil Engineering, Faculty of Engineering, University of Ottawa, 161, Louis Pasteur, Ottawa, ON, K1N 6N5, Canada
;2.Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, Ottawa Institute of Systems Biology, University of Ottawa, Ottawa, Canada
;3.Department of Medical Technology, Faculty of Applied Medical Sciences, King Abdulaziz University, Jeddah, Saudi Arabia
;4.Veolia Water Technologies Canada, Montreal, QC, Canada
;
Abstract:

The moving bed biofilm reactor (MBBR), operated as a post carbon removal system, requires long start-up times in comparison to carbon removal systems due to slow growing autotrophic organisms. This study investigates the use of carriers seeded in a carbon rich treatment system prior to inoculation in a nitrifying MBBR system to promote the rapid development of nitrifying biofilm in an MBBR system at temperatures between 6 and 8?°C. Results show that nitrification was initiated by the carbon removal carriers after 22 h of operation. High throughput 16S-rDNA sequencing indicates that the sloughing period was a result of heterotrophic organism detachment and the recovery and stabilization period included a growth of Nitrosomonas and Nitrospira as the dominant ammonia oxidizing bacteria (AOB) and nitrite oxidizing bacteria (NOB) in the biofilm. Peripheral microorganisms such as Myxococcales, a rapid EPS producer, appear to have contributed to the recovery and stabilization of the biofilm.

Keywords:
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