Rapid start-up of nitrifying MBBRs at low temperatures: nitrification, biofilm response and microbiome analysis.
Bioprocess Biosyst Eng
; 40(5): 731-739, 2017 May.
Article
em En
| MEDLINE
| ID: mdl-28168528
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.
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Base de dados:
MEDLINE
Assunto principal:
Myxococcales
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Biofilmes
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Reatores Biológicos
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Microbiota
Idioma:
En
Ano de publicação:
2017
Tipo de documento:
Article