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- Title
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
- 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.
- Subjects
NITRIFICATION; BIOFILMS; AMMONIA; CARBON; AUTOTROPHIC bacteria; RECOMBINANT DNA; NITROSOMONAS; AMMONIA-oxidizing bacteria
- Publication
Bioprocess & Biosystems Engineering, 2017, Vol 40, Issue 5, p731
- ISSN
1615-7591
- Publication type
Article
- DOI
10.1007/s00449-017-1739-5