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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472 EISSN: 1735-1472
Vol. 12, No. 2, 2015, pp. 747-762
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Bioline Code: st15068
Full paper language: English
Document type: Review Article
Document available free of charge
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International Journal of Environment Science and Technology, Vol. 12, No. 2, 2015, pp. 747-762
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Ecophysiology of nitrifying communities in membrane bioreactors
Awolusi, O.O.; Kumari, S.K.S. & Bux, F.
Abstract
Membrane bioreactors (MBRs) are rapidly
becoming the technology of choice over conventional
activated sludge treatment systems due to their smaller
footprint, reduced sludge production, rapid start-up of
biological processes, complete removal of suspended solids
and better effluent quality. The retention of sufficient
amount of slow-growing nitrifiers makes it feasible for the
MBRs to achieve strong tolerance against the shock loads
with stable and highly efficient nitrogen removal. Various
studies have focused on the ecophysiology of nitrifiers in
MBRs as well as their distinctive operational parameters as
well as their impact on the selection and activity of nitrifying
community. Several techniques have been employed
over the years to understand the nitrifying community and
their interaction within the MBR system, which led to its
modification from the initial design. This review focuses on
the identification of optimal operational and environmental
conditions for efficient nitrification in MBRs. The advantages
and limitations of different techniques employed for
investigating the nitrifying communities in MBRs are also
emphasized.
Keywords
Ammonia-oxidizing archaea; Proteobacteria; Nitrification; Ammonia-oxidizing bacteria; Nitriteoxidizing bacteria; Activated sewage sludge
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